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git/gvfs-helper.c

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// TODO Write a man page. Here are some notes for dogfooding.
// TODO
//
// Usage: git gvfs-helper [<main_options>] <sub-command> [<sub-command-options>]
//
// <main_options>:
//
// --remote=<remote-name> // defaults to "origin"
//
// --fallback // boolean. defaults to off
//
// When a fetch from the cache-server fails, automatically
// fallback to the main Git server. This option has no effect
// if no cache-server is defined.
//
// --cache-server=<use> // defaults to "verify"
//
// verify := lookup the set of defined cache-servers using
// "gvfs/config" and confirm that the selected
// cache-server is well-known. Silently disable the
// cache-server if not. (See security notes later.)
//
// error := verify cache-server and abort if not well-known.
//
// trust := do not verify cache-server. just use it, if set.
//
// disable := disable the cache-server and always use the main
// Git server.
//
// --shared-cache=<odb-directory-pathname>
//
// A relative or absolute pathname to the ODB directory to store
// fetched objects.
//
// If this option is not specified, we default to the value
// in the "gvfs.sharedcache" config setting and then to the
// local ".git/objects" directory.
//
// <sub-command>:
//
// config
//
// Fetch the "gvfs/config" string from the main Git server.
// (The cache-server setting is ignored because cache-servers
// do not support this REST API.)
//
// get
//
// Fetch 1 or more objects one at a time using a "/gvfs/objects"
// GET request.
//
// If a cache-server is configured,
// try it first. Optionally fallback to the main Git server.
//
// The set of objects is given on stdin and is assumed to be
// a list of <oid>, one per line.
//
// <get-options>:
//
// --max-retries=<n> // defaults to "6"
//
// Number of retries after transient network errors.
// Set to zero to disable such retries.
//
// post
//
// Fetch 1 or more objects in bulk using a "/gvfs/objects" POST
// request.
//
// If a cache-server is configured,
// try it first. Optionally fallback to the main Git server.
//
// The set of objects is given on stdin and is assumed to be
// a list of <oid>, one per line.
//
// <get-options>:
//
// --block-size=<n> // defaults to "4000"
//
// Request objects from server in batches of at
// most n objects (not bytes).
//
// --depth=<depth> // defaults to "1"
//
// --max-retries=<n> // defaults to "6"
//
// Number of retries after transient network errors.
// Set to zero to disable such retries.
//
// prefetch
//
// Use "/gvfs/prefetch" REST API to fetch 1 or more commits-and-trees
// prefetch packs from the server.
//
// <prefetch-options>:
//
// --since=<t> // defaults to "0"
//
// Time in seconds since the epoch. If omitted or
// zero, the timestamp from the newest prefetch
// packfile found in the shared-cache ODB is used.
// (This is based upon the packfile name, not the
// mtime.)
//
// The GVFS Protocol defines this value as a way to
// request cached packfiles NEWER THAN this timestamp.
//
// server
//
// Interactive/sub-process mode. Listen for a series of commands
// and data on stdin and return results on stdout. This command
// uses pkt-line format [1] and implements the long-running process
// protocol [2] to communicate with the foreground/parent process.
//
// <server-options>:
//
// --block-size=<n> // defaults to "4000"
//
// Request objects from server in batches of at
// most n objects (not bytes) when using POST
// requests.
//
// --depth=<depth> // defaults to "1"
//
// --max-retries=<n> // defaults to "6"
//
// Number of retries after transient network errors.
// Set to zero to disable such retries.
//
// Interactive verb: objects.get
//
// Fetch 1 or more objects, one at a time, using a
// "/gvfs/objects" GET requests.
//
// Each object will be created as a loose object in the ODB.
//
// Create 1 or more loose objects in the shared-cache ODB.
// (The pathname of the selected ODB is reported at the
// beginning of the response; this should match the pathname
// given on the command line).
//
// git> objects.get
// git> <oid>
// git> <oid>
// git> ...
// git> <oid>
// git> 0000
//
// git< odb <directory>
// git< loose <oid>
// git< loose <oid>
// git< ...
// git< loose <oid>
// git< ok | partial | error <message>
// git< 0000
//
// Interactive verb: objects.post
//
// Fetch 1 or more objects, in bulk, using one or more
// "/gvfs/objects" POST requests.
//
// Create 1 or more loose objects and/or packfiles in the
// shared-cache ODB. A POST is allowed to respond with
// either loose or packed objects.
//
// git> objects.post
// git> <oid>
// git> <oid>
// git> ...
// git> <oid>
// git> 0000
//
// git< odb <directory>
// git< loose <oid> | packfile <filename.pack>
// git< loose <oid> | packfile <filename.pack>
// git< ...
// git< loose <oid> | packfile <filename.pack>
// git< ok | partial | error <message>
// git< 0000
//
// Interactive verb: object.prefetch
//
// Fetch 1 or more prefetch packs using a "/gvfs/prefetch"
// request.
//
// git> objects.prefetch
// git> <timestamp> // optional
// git> 0000
//
// git< odb <directory>
// git< packfile <filename.pack>
// git< packfile <filename.pack>
// git< ...
// git< packfile <filename.pack>
// git< ok | error <message>
// git< 0000
//
// If a cache-server is configured, try it first.
// Optionally fallback to the main Git server.
//
// [1] Documentation/technical/protocol-common.txt
// [2] Documentation/technical/long-running-process-protocol.txt
// [3] See GIT_TRACE_PACKET
//
// endpoint
//
// Fetch the given endpoint from the main Git server (specifying
// `gvfs/config` as endpoint is idempotent to the `config`
// command mentioned above).
//
//////////////////////////////////////////////////////////////////
#include "cache.h"
#include "config.h"
#include "remote.h"
#include "connect.h"
#include "strbuf.h"
#include "walker.h"
#include "http.h"
#include "exec-cmd.h"
#include "run-command.h"
#include "pkt-line.h"
#include "string-list.h"
#include "sideband.h"
#include "strvec.h"
#include "credential.h"
#include "oid-array.h"
#include "send-pack.h"
#include "protocol.h"
#include "quote.h"
#include "transport.h"
#include "parse-options.h"
#include "object-store.h"
#include "json-writer.h"
#include "tempfile.h"
#include "oidset.h"
#include "dir.h"
#include "progress.h"
#include "packfile.h"
#include "date.h"
#define TR2_CAT "gvfs-helper"
static const char * const main_usage[] = {
N_("git gvfs-helper [<main_options>] config [<options>]"),
N_("git gvfs-helper [<main_options>] get [<options>]"),
N_("git gvfs-helper [<main_options>] post [<options>]"),
N_("git gvfs-helper [<main_options>] prefetch [<options>]"),
N_("git gvfs-helper [<main_options>] server [<options>]"),
NULL
};
static const char *const objects_get_usage[] = {
N_("git gvfs-helper [<main_options>] get [<options>]"),
NULL
};
static const char *const objects_post_usage[] = {
N_("git gvfs-helper [<main_options>] post [<options>]"),
NULL
};
static const char *const prefetch_usage[] = {
N_("git gvfs-helper [<main_options>] prefetch [<options>]"),
NULL
};
static const char *const server_usage[] = {
N_("git gvfs-helper [<main_options>] server [<options>]"),
NULL
};
/*
* "commitDepth" field in gvfs protocol
*/
#define GH__DEFAULT__OBJECTS_POST__COMMIT_DEPTH 1
/*
* Chunk/block size in number of objects we request in each packfile
*/
#define GH__DEFAULT__OBJECTS_POST__BLOCK_SIZE 4000
/*
* Retry attempts (after the initial request) for transient errors and 429s.
*/
#define GH__DEFAULT_MAX_RETRIES 6
/*
* Maximum delay in seconds for transient (network) error retries.
*/
#define GH__DEFAULT_MAX_TRANSIENT_BACKOFF_SEC 300
/*
* Our exit-codes.
*/
enum gh__error_code {
GH__ERROR_CODE__USAGE = -1, /* will be mapped to usage() */
GH__ERROR_CODE__OK = 0,
GH__ERROR_CODE__ERROR = 1, /* unspecified */
GH__ERROR_CODE__CURL_ERROR = 2,
GH__ERROR_CODE__HTTP_401 = 3,
GH__ERROR_CODE__HTTP_404 = 4,
GH__ERROR_CODE__HTTP_429 = 5,
GH__ERROR_CODE__HTTP_503 = 6,
GH__ERROR_CODE__HTTP_OTHER = 7,
GH__ERROR_CODE__UNEXPECTED_CONTENT_TYPE = 8,
GH__ERROR_CODE__COULD_NOT_CREATE_TEMPFILE = 8,
GH__ERROR_CODE__COULD_NOT_INSTALL_LOOSE = 10,
GH__ERROR_CODE__COULD_NOT_INSTALL_PACKFILE = 11,
GH__ERROR_CODE__SUBPROCESS_SYNTAX = 12,
GH__ERROR_CODE__INDEX_PACK_FAILED = 13,
GH__ERROR_CODE__COULD_NOT_INSTALL_PREFETCH = 14,
};
enum gh__cache_server_mode {
/* verify URL. disable if unknown. */
GH__CACHE_SERVER_MODE__VERIFY_DISABLE = 0,
/* verify URL. error if unknown. */
GH__CACHE_SERVER_MODE__VERIFY_ERROR,
/* disable the cache-server, if defined */
GH__CACHE_SERVER_MODE__DISABLE,
/* trust any cache-server */
GH__CACHE_SERVER_MODE__TRUST_WITHOUT_VERIFY,
};
/*
* The set of command line, config, and environment variables
* that we use as input to decide how we should operate.
*/
static struct gh__cmd_opts {
const char *remote_name;
int try_fallback; /* to git server if cache-server fails */
int show_progress;
int depth;
int block_size;
int max_retries;
int max_transient_backoff_sec;
enum gh__cache_server_mode cache_server_mode;
} gh__cmd_opts;
/*
* The chosen global state derrived from the inputs in gh__cmd_opts.
*/
static struct gh__global {
struct remote *remote;
struct credential main_creds;
struct credential cache_creds;
const char *main_url;
const char *cache_server_url;
struct strbuf buf_odb_path;
int http_is_initialized;
int cache_server_is_initialized; /* did sub-command look for one */
int main_creds_need_approval; /* try to only approve them once */
} gh__global;
enum gh__server_type {
GH__SERVER_TYPE__MAIN = 0,
GH__SERVER_TYPE__CACHE = 1,
GH__SERVER_TYPE__NR,
};
static const char *gh__server_type_label[GH__SERVER_TYPE__NR] = {
"(main)",
"(cs)"
};
enum gh__objects_mode {
GH__OBJECTS_MODE__NONE = 0,
/*
* Bulk fetch objects.
*
* But also, force the use of HTTP POST regardless of how many
* objects we are requesting.
*
* The GVFS Protocol treats requests for commit objects
* differently in GET and POST requests WRT whether it
* automatically also fetches the referenced trees.
*/
GH__OBJECTS_MODE__POST,
/*
* Fetch objects one at a time using HTTP GET.
*
* Force the use of GET (primarily because of the commit
* object treatment).
*/
GH__OBJECTS_MODE__GET,
/*
* Fetch one or more pre-computed "prefetch packs" containing
* commits and trees.
*/
GH__OBJECTS_MODE__PREFETCH,
};
struct gh__azure_throttle
{
unsigned long tstu_limit;
unsigned long tstu_remaining;
unsigned long reset_sec;
unsigned long retry_after_sec;
};
static void gh__azure_throttle__zero(struct gh__azure_throttle *azure)
{
azure->tstu_limit = 0;
azure->tstu_remaining = 0;
azure->reset_sec = 0;
azure->retry_after_sec = 0;
}
#define GH__AZURE_THROTTLE_INIT { \
.tstu_limit = 0, \
.tstu_remaining = 0, \
.reset_sec = 0, \
.retry_after_sec = 0, \
}
static struct gh__azure_throttle gh__global_throttle[GH__SERVER_TYPE__NR] = {
GH__AZURE_THROTTLE_INIT,
GH__AZURE_THROTTLE_INIT,
};
/*
* Stolen from http.c
*/
static CURLcode gh__curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
{
char *ptr;
CURLcode ret;
strbuf_reset(buf);
ret = curl_easy_getinfo(curl, info, &ptr);
if (!ret && ptr)
strbuf_addstr(buf, ptr);
return ret;
}
enum gh__progress_state {
GH__PROGRESS_STATE__START = 0,
GH__PROGRESS_STATE__PHASE1,
GH__PROGRESS_STATE__PHASE2,
GH__PROGRESS_STATE__PHASE3,
};
/*
* Parameters to drive an HTTP request (with any necessary retries).
*/
struct gh__request_params {
/*
* b_is_post indicates if the current HTTP request is a POST=1 or
* a GET=0. This is a lower level field used to setup CURL and
* the tempfile used to receive the content.
*
* It is related to, but different from the GH__OBJECTS_MODE__
* field that we present to the gvfs-helper client or in the CLI
* (which only concerns the semantics of the /gvfs/objects protocol
* on the set of requested OIDs).
*
* For example, we use an HTTP GET to get the /gvfs/config data
* into a buffer.
*/
int b_is_post;
int b_write_to_file; /* write to file=1 or strbuf=0 */
int b_permit_cache_server_if_defined;
enum gh__objects_mode objects_mode;
enum gh__server_type server_type;
int k_attempt; /* robust retry attempt */
int k_transient_delay_sec; /* delay before transient error retries */
unsigned long object_count; /* number of objects being fetched */
const struct strbuf *post_payload; /* POST body to send */
struct curl_slist *headers; /* additional http headers to send */
struct tempfile *tempfile; /* for response content when file */
struct strbuf *buffer; /* for response content when strbuf */
struct strbuf tr2_label; /* for trace2 regions */
struct object_id loose_oid;
/*
* Note that I am putting all of the progress-related instance data
* inside the request-params in the hope that we can eventually
* do multi-threaded/concurrent HTTP requests when chunking
* large requests. However, the underlying "struct progress" API
* is not thread safe (that is, it doesn't allow concurrent progress
* reports (since that might require multiple lines on the screen
* or something)).
*/
enum gh__progress_state progress_state;
struct strbuf progress_base_phase2_msg;
struct strbuf progress_base_phase3_msg;
/*
* The buffer for the formatted progress message is shared by the
* "struct progress" API and must remain valid for the duration of
* the start_progress..stop_progress lifespan.
*/
struct strbuf progress_msg;
struct progress *progress;
struct strbuf e2eid;
struct string_list *result_list; /* we do not own this */
};
#define GH__REQUEST_PARAMS_INIT { \
.b_is_post = 0, \
.b_write_to_file = 0, \
.b_permit_cache_server_if_defined = 1, \
.server_type = GH__SERVER_TYPE__MAIN, \
.k_attempt = 0, \
.k_transient_delay_sec = 0, \
.object_count = 0, \
.post_payload = NULL, \
.headers = NULL, \
.tempfile = NULL, \
.buffer = NULL, \
.tr2_label = STRBUF_INIT, \
.loose_oid = {{0}}, \
.progress_state = GH__PROGRESS_STATE__START, \
.progress_base_phase2_msg = STRBUF_INIT, \
.progress_base_phase3_msg = STRBUF_INIT, \
.progress_msg = STRBUF_INIT, \
.progress = NULL, \
.e2eid = STRBUF_INIT, \
.result_list = NULL, \
}
static void gh__request_params__release(struct gh__request_params *params)
{
if (!params)
return;
params->post_payload = NULL; /* we do not own this */
curl_slist_free_all(params->headers);
params->headers = NULL;
delete_tempfile(&params->tempfile);
params->buffer = NULL; /* we do not own this */
strbuf_release(&params->tr2_label);
strbuf_release(&params->progress_base_phase2_msg);
strbuf_release(&params->progress_base_phase3_msg);
strbuf_release(&params->progress_msg);
stop_progress(&params->progress);
params->progress = NULL;
strbuf_release(&params->e2eid);
params->result_list = NULL; /* we do not own this */
}
/*
* How we handle retries for various unexpected network errors.
*/
enum gh__retry_mode {
/*
* The operation was successful, so no retry is needed.
* Use this for HTTP 200, for example.
*/
GH__RETRY_MODE__SUCCESS = 0,
/*
* Retry using the normal 401 Auth mechanism.
*/
GH__RETRY_MODE__HTTP_401,
/*
* Fail because at least one of the requested OIDs does not exist.
*/
GH__RETRY_MODE__FAIL_404,
/*
* A transient network error, such as dropped connection
* or network IO error. Our belief is that a retry MAY
* succeed. (See Gremlins and Cosmic Rays....)
*/
GH__RETRY_MODE__TRANSIENT,
/*
* Request was blocked completely because of a 429.
*/
GH__RETRY_MODE__HTTP_429,
/*
* Request failed because the server was (temporarily?) offline.
*/
GH__RETRY_MODE__HTTP_503,
/*
* The operation had a hard failure and we have no
* expectation that a second attempt will give a different
* answer, such as a bad hostname or a mal-formed URL.
*/
GH__RETRY_MODE__HARD_FAIL,
};
/*
* Bucket to describe the results of an HTTP requests (may be
* overwritten during retries so that it describes the final attempt).
*/
struct gh__response_status {
struct strbuf error_message;
struct strbuf content_type;
enum gh__error_code ec;
enum gh__retry_mode retry;
intmax_t bytes_received;
struct gh__azure_throttle *azure;
};
#define GH__RESPONSE_STATUS_INIT { \
.error_message = STRBUF_INIT, \
.content_type = STRBUF_INIT, \
.ec = GH__ERROR_CODE__OK, \
.retry = GH__RETRY_MODE__SUCCESS, \
.bytes_received = 0, \
.azure = NULL, \
}
static void gh__response_status__zero(struct gh__response_status *s)
{
strbuf_setlen(&s->error_message, 0);
strbuf_setlen(&s->content_type, 0);
s->ec = GH__ERROR_CODE__OK;
s->retry = GH__RETRY_MODE__SUCCESS;
s->bytes_received = 0;
s->azure = NULL;
}
static void install_result(struct gh__request_params *params,
struct gh__response_status *status);
/*
* Log the E2EID for the current request.
*
* Since every HTTP request to the cache-server and to the main Git server
* will send back a unique E2EID (probably a GUID), we don't want to overload
* telemetry with each ID -- rather, only the ones for which there was a
* problem and that may be helpful in a post mortem.
*/
static void log_e2eid(struct gh__request_params *params,
struct gh__response_status *status)
{
if (!params->e2eid.len)
return;
switch (status->retry) {
default:
case GH__RETRY_MODE__SUCCESS:
case GH__RETRY_MODE__HTTP_401:
case GH__RETRY_MODE__FAIL_404:
return;
case GH__RETRY_MODE__HARD_FAIL:
case GH__RETRY_MODE__TRANSIENT:
case GH__RETRY_MODE__HTTP_429:
case GH__RETRY_MODE__HTTP_503:
break;
}
if (trace2_is_enabled()) {
struct strbuf key = STRBUF_INIT;
strbuf_addstr(&key, "e2eid");
strbuf_addstr(&key, gh__server_type_label[params->server_type]);
trace2_data_string(TR2_CAT, NULL, key.buf,
params->e2eid.buf);
strbuf_release(&key);
}
}
/*
* Normalize a few HTTP response codes before we try to decide
* how to dispatch on them.
*/
static long gh__normalize_odd_codes(struct gh__request_params *params,
long http_response_code)
{
if (params->server_type == GH__SERVER_TYPE__CACHE &&
http_response_code == 400) {
/*
* The cache-server sends a somewhat bogus 400 instead of
* the normal 401 when AUTH is required. Fixup the status
* to hide that.
*
* TODO Technically, the cache-server could send a 400
* TODO for many reasons, not just for their bogus
* TODO pseudo-401, but we're going to assume it is a
* TODO 401 for now. We should confirm the expected
* TODO error message in the response-body.
*/
return 401;
}
if (http_response_code == 203) {
/*
* A proxy server transformed a 200 from the origin server
* into a 203. We don't care about the subtle distinction.
*/
return 200;
}
return http_response_code;
}
/*
* Map HTTP response codes into a retry strategy.
* See https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
*
* https://docs.microsoft.com/en-us/azure/devops/integrate/concepts/rate-limits?view=azure-devops
*/
static void compute_retry_mode_from_http_response(
struct gh__response_status *status,
long http_response_code)
{
switch (http_response_code) {
case 200:
status->retry = GH__RETRY_MODE__SUCCESS;
status->ec = GH__ERROR_CODE__OK;
return;
case 301: /* all the various flavors of HTTP Redirect */
case 302:
case 303:
case 304:
case 305:
case 306:
case 307:
case 308:
/*
* TODO Consider a redirected-retry (with or without
* TODO a Retry-After header).
*/
goto hard_fail;
case 401:
strbuf_addstr(&status->error_message,
"(http:401) Not Authorized");
status->retry = GH__RETRY_MODE__HTTP_401;
status->ec = GH__ERROR_CODE__HTTP_401;
return;
case 404:
/*
* TODO if params->object_count > 1, consider
* TODO splitting the request into 2 halves
* TODO and retrying each half in series.
*/
strbuf_addstr(&status->error_message,
"(http:404) Not Found");
status->retry = GH__RETRY_MODE__FAIL_404;
status->ec = GH__ERROR_CODE__HTTP_404;
return;
case 429:
/*
* This is a hard block because we've been bad.
*/
strbuf_addstr(&status->error_message,
"(http:429) Too Many Requests [throttled]");
status->retry = GH__RETRY_MODE__HTTP_429;
status->ec = GH__ERROR_CODE__HTTP_429;
trace2_data_string(TR2_CAT, NULL, "error/http",
status->error_message.buf);
return;
case 503:
/*
* We assume that this comes with a "Retry-After" header like 429s.
*/
strbuf_addstr(&status->error_message,
"(http:503) Server Unavailable [throttled]");
status->retry = GH__RETRY_MODE__HTTP_503;
status->ec = GH__ERROR_CODE__HTTP_503;
trace2_data_string(TR2_CAT, NULL, "error/http",
status->error_message.buf);
return;
default:
goto hard_fail;
}
hard_fail:
strbuf_addf(&status->error_message, "(http:%d) Other [hard_fail]",
(int)http_response_code);
status->retry = GH__RETRY_MODE__HARD_FAIL;
status->ec = GH__ERROR_CODE__HTTP_OTHER;
trace2_data_string(TR2_CAT, NULL, "error/http",
status->error_message.buf);
return;
}
/*
* Map CURLE errors code to a retry strategy.
* See <curl/curl.h> and
* https://curl.haxx.se/libcurl/c/libcurl-errors.html
*
* This could be a static table rather than a switch, but
* that is harder to debug and we may want to selectively
* log errors.
*
* I've commented out all of the hard-fail cases for now
* and let the default handle them. This is to indicate
* that I considered them and found them to be not actionable.
* Also, the spelling of some of the CURLE_ symbols seem
* to change between curl releases on different platforms,
* so I'm not going to fight that.
*/
static void compute_retry_mode_from_curl_error(
struct gh__response_status *status,
CURLcode curl_code)
{
switch (curl_code) {
case CURLE_OK:
status->retry = GH__RETRY_MODE__SUCCESS;
status->ec = GH__ERROR_CODE__OK;
return;
//se CURLE_UNSUPPORTED_PROTOCOL: goto hard_fail;
//se CURLE_FAILED_INIT: goto hard_fail;
//se CURLE_URL_MALFORMAT: goto hard_fail;
//se CURLE_NOT_BUILT_IN: goto hard_fail;
//se CURLE_COULDNT_RESOLVE_PROXY: goto hard_fail;
//se CURLE_COULDNT_RESOLVE_HOST: goto hard_fail;
case CURLE_COULDNT_CONNECT: goto transient;
//se CURLE_WEIRD_SERVER_REPLY: goto hard_fail;
//se CURLE_REMOTE_ACCESS_DENIED: goto hard_fail;
//se CURLE_FTP_ACCEPT_FAILED: goto hard_fail;
//se CURLE_FTP_WEIRD_PASS_REPLY: goto hard_fail;
//se CURLE_FTP_ACCEPT_TIMEOUT: goto hard_fail;
//se CURLE_FTP_WEIRD_PASV_REPLY: goto hard_fail;
//se CURLE_FTP_WEIRD_227_FORMAT: goto hard_fail;
//se CURLE_FTP_CANT_GET_HOST: goto hard_fail;
case CURLE_HTTP2: goto transient;
//se CURLE_FTP_COULDNT_SET_TYPE: goto hard_fail;
case CURLE_PARTIAL_FILE: goto transient;
//se CURLE_FTP_COULDNT_RETR_FILE: goto hard_fail;
//se CURLE_OBSOLETE20: goto hard_fail;
//se CURLE_QUOTE_ERROR: goto hard_fail;
//se CURLE_HTTP_RETURNED_ERROR: goto hard_fail;
case CURLE_WRITE_ERROR: goto transient;
//se CURLE_OBSOLETE24: goto hard_fail;
case CURLE_UPLOAD_FAILED: goto transient;
//se CURLE_READ_ERROR: goto hard_fail;
//se CURLE_OUT_OF_MEMORY: goto hard_fail;
case CURLE_OPERATION_TIMEDOUT: goto transient;
//se CURLE_OBSOLETE29: goto hard_fail;
//se CURLE_FTP_PORT_FAILED: goto hard_fail;
//se CURLE_FTP_COULDNT_USE_REST: goto hard_fail;
//se CURLE_OBSOLETE32: goto hard_fail;
//se CURLE_RANGE_ERROR: goto hard_fail;
case CURLE_HTTP_POST_ERROR: goto transient;
//se CURLE_SSL_CONNECT_ERROR: goto hard_fail;
//se CURLE_BAD_DOWNLOAD_RESUME: goto hard_fail;
//se CURLE_FILE_COULDNT_READ_FILE: goto hard_fail;
//se CURLE_LDAP_CANNOT_BIND: goto hard_fail;
//se CURLE_LDAP_SEARCH_FAILED: goto hard_fail;
//se CURLE_OBSOLETE40: goto hard_fail;
//se CURLE_FUNCTION_NOT_FOUND: goto hard_fail;
//se CURLE_ABORTED_BY_CALLBACK: goto hard_fail;
//se CURLE_BAD_FUNCTION_ARGUMENT: goto hard_fail;
//se CURLE_OBSOLETE44: goto hard_fail;
//se CURLE_INTERFACE_FAILED: goto hard_fail;
//se CURLE_OBSOLETE46: goto hard_fail;
//se CURLE_TOO_MANY_REDIRECTS: goto hard_fail;
//se CURLE_UNKNOWN_OPTION: goto hard_fail;
//se CURLE_TELNET_OPTION_SYNTAX: goto hard_fail;
//se CURLE_OBSOLETE50: goto hard_fail;
//se CURLE_PEER_FAILED_VERIFICATION: goto hard_fail;
//se CURLE_GOT_NOTHING: goto hard_fail;
//se CURLE_SSL_ENGINE_NOTFOUND: goto hard_fail;
//se CURLE_SSL_ENGINE_SETFAILED: goto hard_fail;
case CURLE_SEND_ERROR: goto transient;
case CURLE_RECV_ERROR: goto transient;
//se CURLE_OBSOLETE57: goto hard_fail;
//se CURLE_SSL_CERTPROBLEM: goto hard_fail;
//se CURLE_SSL_CIPHER: goto hard_fail;
//se CURLE_SSL_CACERT: goto hard_fail;
//se CURLE_BAD_CONTENT_ENCODING: goto hard_fail;
//se CURLE_LDAP_INVALID_URL: goto hard_fail;
//se CURLE_FILESIZE_EXCEEDED: goto hard_fail;
//se CURLE_USE_SSL_FAILED: goto hard_fail;
//se CURLE_SEND_FAIL_REWIND: goto hard_fail;
//se CURLE_SSL_ENGINE_INITFAILED: goto hard_fail;
//se CURLE_LOGIN_DENIED: goto hard_fail;
//se CURLE_TFTP_NOTFOUND: goto hard_fail;
//se CURLE_TFTP_PERM: goto hard_fail;
//se CURLE_REMOTE_DISK_FULL: goto hard_fail;
//se CURLE_TFTP_ILLEGAL: goto hard_fail;
//se CURLE_TFTP_UNKNOWNID: goto hard_fail;
//se CURLE_REMOTE_FILE_EXISTS: goto hard_fail;
//se CURLE_TFTP_NOSUCHUSER: goto hard_fail;
//se CURLE_CONV_FAILED: goto hard_fail;
//se CURLE_CONV_REQD: goto hard_fail;
//se CURLE_SSL_CACERT_BADFILE: goto hard_fail;
//se CURLE_REMOTE_FILE_NOT_FOUND: goto hard_fail;
//se CURLE_SSH: goto hard_fail;
//se CURLE_SSL_SHUTDOWN_FAILED: goto hard_fail;
case CURLE_AGAIN: goto transient;
//se CURLE_SSL_CRL_BADFILE: goto hard_fail;
//se CURLE_SSL_ISSUER_ERROR: goto hard_fail;
//se CURLE_FTP_PRET_FAILED: goto hard_fail;
//se CURLE_RTSP_CSEQ_ERROR: goto hard_fail;
//se CURLE_RTSP_SESSION_ERROR: goto hard_fail;
//se CURLE_FTP_BAD_FILE_LIST: goto hard_fail;
//se CURLE_CHUNK_FAILED: goto hard_fail;
//se CURLE_NO_CONNECTION_AVAILABLE: goto hard_fail;
//se CURLE_SSL_PINNEDPUBKEYNOTMATCH: goto hard_fail;
//se CURLE_SSL_INVALIDCERTSTATUS: goto hard_fail;
#ifdef CURLE_HTTP2_STREAM
case CURLE_HTTP2_STREAM: goto transient;
#endif
default: goto hard_fail;
}
hard_fail:
strbuf_addf(&status->error_message, "(curl:%d) %s [hard_fail]",
curl_code, curl_easy_strerror(curl_code));
status->retry = GH__RETRY_MODE__HARD_FAIL;
status->ec = GH__ERROR_CODE__CURL_ERROR;
trace2_data_string(TR2_CAT, NULL, "error/curl",
status->error_message.buf);
return;
transient:
strbuf_addf(&status->error_message, "(curl:%d) %s [transient]",
curl_code, curl_easy_strerror(curl_code));
status->retry = GH__RETRY_MODE__TRANSIENT;
status->ec = GH__ERROR_CODE__CURL_ERROR;
trace2_data_string(TR2_CAT, NULL, "error/curl",
status->error_message.buf);
return;
}
/*
* Create a single normalized 'ec' error-code from the status we
* received from the HTTP request. Map a few of the expected HTTP
* status code to 'ec', but don't get too crazy here.
*/
static void gh__response_status__set_from_slot(
struct gh__request_params *params,
struct gh__response_status *status,
const struct active_request_slot *slot)
{
long http_response_code;
CURLcode curl_code;
curl_code = slot->results->curl_result;
gh__curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE,
&status->content_type);
curl_easy_getinfo(slot->curl, CURLINFO_RESPONSE_CODE,
&http_response_code);
strbuf_setlen(&status->error_message, 0);
http_response_code = gh__normalize_odd_codes(params,
http_response_code);
/*
* Use normalized response/status codes form curl/http to decide
* how to set the error-code we propagate *AND* to decide if we
* we should retry because of transient network problems.
*/
if (curl_code == CURLE_OK ||
curl_code == CURLE_HTTP_RETURNED_ERROR)
compute_retry_mode_from_http_response(status,
http_response_code);
else
compute_retry_mode_from_curl_error(status, curl_code);
if (status->ec != GH__ERROR_CODE__OK)
status->bytes_received = 0;
else if (params->b_write_to_file)
status->bytes_received = (intmax_t)ftell(params->tempfile->fp);
else
status->bytes_received = (intmax_t)params->buffer->len;
}
static void gh__response_status__release(struct gh__response_status *status)
{
if (!status)
return;
strbuf_release(&status->error_message);
strbuf_release(&status->content_type);
}
static int gh__curl_progress_cb(void *clientp,
curl_off_t dltotal, curl_off_t dlnow,
curl_off_t ultotal, curl_off_t ulnow)
{
struct gh__request_params *params = clientp;
/*
* From what I can tell, CURL progress arrives in 3 phases.
*
* [1] An initial connection setup phase where we get [0,0] [0,0].
* [2] An upload phase where we start sending the request headers
* and body. ulnow will be > 0. ultotal may or may not be 0.
* [3] A download phase where we start receiving the response
* headers and payload body. dlnow will be > 0. dltotal may
* or may not be 0.
*
* If we pass zero for the total to the "struct progress" API, we
* get simple numbers rather than percentages. So our progress
* output format may vary depending.
*
* It is unclear if CURL will give us a final callback after
* everything is finished, so we leave the progress handle open
* and let the caller issue the final stop_progress().
*
* There is a bit of a mismatch between the CURL API and the
* "struct progress" API. The latter requires us to set the
* progress message when we call one of the start_progress
* methods. We cannot change the progress message while we are
* showing progress state. And we cannot change the denominator
* (total) after we start. CURL may or may not give us the total
* sizes for each phase.
*
* Also be advised that the "struct progress" API eats messages
* so that the screen is only updated every second or so. And
* may not print anything if the start..stop happen in less then
* 2 seconds. Whereas CURL calls this callback very frequently.
* The net-net is that we may not actually see this progress
* message for small/fast HTTP requests.
*/
switch (params->progress_state) {
case GH__PROGRESS_STATE__START: /* first callback */
if (dlnow == 0 && ulnow == 0)
goto enter_phase_1;
if (ulnow)
goto enter_phase_2;
else
goto enter_phase_3;
case GH__PROGRESS_STATE__PHASE1:
if (dlnow == 0 && ulnow == 0)
return 0;
if (ulnow)
goto enter_phase_2;
else
goto enter_phase_3;
case GH__PROGRESS_STATE__PHASE2:
display_progress(params->progress, ulnow);
if (dlnow == 0)
return 0;
stop_progress(&params->progress);
goto enter_phase_3;
case GH__PROGRESS_STATE__PHASE3:
display_progress(params->progress, dlnow);
return 0;
default:
return 0;
}
enter_phase_1:
/*
* Don't bother to create a progress handle during phase [1].
* Because we get [0,0,0,0], we don't have any data to report
* and would just have to synthesize some type of progress.
* From my testing, phase [1] is fairly quick (probably just
* the SSL handshake), so the "struct progress" API will most
* likely completely eat any messages that we did produce.
*/
params->progress_state = GH__PROGRESS_STATE__PHASE1;
return 0;
enter_phase_2:
strbuf_setlen(&params->progress_msg, 0);
if (params->progress_base_phase2_msg.len) {
if (params->k_attempt > 0)
strbuf_addf(&params->progress_msg, "%s [retry %d/%d] (bytes sent)",
params->progress_base_phase2_msg.buf,
params->k_attempt, gh__cmd_opts.max_retries);
else
strbuf_addf(&params->progress_msg, "%s (bytes sent)",
params->progress_base_phase2_msg.buf);
params->progress = start_progress(params->progress_msg.buf, ultotal);
display_progress(params->progress, ulnow);
}
params->progress_state = GH__PROGRESS_STATE__PHASE2;
return 0;
enter_phase_3:
strbuf_setlen(&params->progress_msg, 0);
if (params->progress_base_phase3_msg.len) {
if (params->k_attempt > 0)
strbuf_addf(&params->progress_msg, "%s [retry %d/%d] (bytes received)",
params->progress_base_phase3_msg.buf,
params->k_attempt, gh__cmd_opts.max_retries);
else
strbuf_addf(&params->progress_msg, "%s (bytes received)",
params->progress_base_phase3_msg.buf);
params->progress = start_progress(params->progress_msg.buf, dltotal);
display_progress(params->progress, dlnow);
}
params->progress_state = GH__PROGRESS_STATE__PHASE3;
return 0;
}
/*
* Run the request without using "run_one_slot()" because we
* don't want the post-request normalization, error handling,
* and auto-reauth handling in http.c.
*/
static void gh__run_one_slot(struct active_request_slot *slot,
struct gh__request_params *params,
struct gh__response_status *status)
{
struct strbuf key = STRBUF_INIT;
strbuf_addbuf(&key, &params->tr2_label);
strbuf_addstr(&key, gh__server_type_label[params->server_type]);
params->progress_state = GH__PROGRESS_STATE__START;
strbuf_setlen(&params->e2eid, 0);
trace2_region_enter(TR2_CAT, key.buf, NULL);
if (!start_active_slot(slot)) {
compute_retry_mode_from_curl_error(status,
CURLE_FAILED_INIT);
} else {
run_active_slot(slot);
if (params->b_write_to_file)
fflush(params->tempfile->fp);
gh__response_status__set_from_slot(params, status, slot);
log_e2eid(params, status);
if (status->ec == GH__ERROR_CODE__OK) {
int old_len = key.len;
/*
* We only log the number of bytes received.
* We do not log the number of objects requested
* because the server may give us more than that
* (such as when we request a commit).
*/
strbuf_addstr(&key, "/nr_bytes");
trace2_data_intmax(TR2_CAT, NULL,
key.buf,
status->bytes_received);
strbuf_setlen(&key, old_len);
}
}
if (params->progress)
stop_progress(&params->progress);
if (status->ec == GH__ERROR_CODE__OK && params->b_write_to_file)
install_result(params, status);
trace2_region_leave(TR2_CAT, key.buf, NULL);
strbuf_release(&key);
}
static int option_parse_cache_server_mode(const struct option *opt,
const char *arg, int unset)
{
if (unset) /* should not happen */
return error(_("missing value for switch '%s'"),
opt->long_name);
else if (!strcmp(arg, "verify"))
gh__cmd_opts.cache_server_mode =
GH__CACHE_SERVER_MODE__VERIFY_DISABLE;
else if (!strcmp(arg, "error"))
gh__cmd_opts.cache_server_mode =
GH__CACHE_SERVER_MODE__VERIFY_ERROR;
else if (!strcmp(arg, "disable"))
gh__cmd_opts.cache_server_mode =
GH__CACHE_SERVER_MODE__DISABLE;
else if (!strcmp(arg, "trust"))
gh__cmd_opts.cache_server_mode =
GH__CACHE_SERVER_MODE__TRUST_WITHOUT_VERIFY;
else
return error(_("invalid value for switch '%s'"),
opt->long_name);
return 0;
}
/*
* Let command line args override "gvfs.sharedcache" config setting
* and override the value set by git_default_config().
*
* The command line is parsed *AFTER* the config is loaded, so
* prepared_alt_odb() has already been called any default or inherited
* shared-cache has already been set.
*
* We have a chance to override it here.
*/
static int option_parse_shared_cache_directory(const struct option *opt,
const char *arg, int unset)
{
struct strbuf buf_arg = STRBUF_INIT;
if (unset) /* should not happen */
return error(_("missing value for switch '%s'"),
opt->long_name);
strbuf_addstr(&buf_arg, arg);
if (strbuf_normalize_path(&buf_arg) < 0) {
/*
* Pretend command line wasn't given. Use whatever
* settings we already have from the config.
*/
strbuf_release(&buf_arg);
return 0;
}
strbuf_trim_trailing_dir_sep(&buf_arg);
if (!strbuf_cmp(&buf_arg, &gvfs_shared_cache_pathname)) {
/*
* The command line argument matches what we got from
* the config, so we're already setup correctly. (And
* we have already verified that the directory exists
* on disk.)
*/
strbuf_release(&buf_arg);
return 0;
}
else if (!gvfs_shared_cache_pathname.len) {
/*
* A shared-cache was requested and we did not inherit one.
* Try it, but let alt_odb_usable() secretly disable it if
* it cannot create the directory on disk.
*/
strbuf_addbuf(&gvfs_shared_cache_pathname, &buf_arg);
add_to_alternates_memory(buf_arg.buf);
strbuf_release(&buf_arg);
return 0;
}
else {
/*
* The requested shared-cache is different from the one
* we inherited. Replace the inherited value with this
* one, but smartly fallback if necessary.
*/
struct strbuf buf_prev = STRBUF_INIT;
strbuf_addbuf(&buf_prev, &gvfs_shared_cache_pathname);
strbuf_setlen(&gvfs_shared_cache_pathname, 0);
strbuf_addbuf(&gvfs_shared_cache_pathname, &buf_arg);
add_to_alternates_memory(buf_arg.buf);
/*
* alt_odb_usable() releases gvfs_shared_cache_pathname
* if it cannot create the directory on disk, so fallback
* to the previous choice when it fails.
*/
if (!gvfs_shared_cache_pathname.len)
strbuf_addbuf(&gvfs_shared_cache_pathname,
&buf_prev);
strbuf_release(&buf_arg);
strbuf_release(&buf_prev);
return 0;
}
}
/*
* Lookup the URL for this remote (defaults to 'origin').
*/
static void lookup_main_url(void)
{
/*
* Both VFS and Scalar only work with 'origin', so we expect this.
* The command line arg is mainly for debugging.
*/
if (!gh__cmd_opts.remote_name || !*gh__cmd_opts.remote_name)
gh__cmd_opts.remote_name = "origin";
gh__global.remote = remote_get(gh__cmd_opts.remote_name);
if (!gh__global.remote->url[0] || !*gh__global.remote->url[0])
die("unknown remote '%s'", gh__cmd_opts.remote_name);
/*
* Strip out any in-line auth in the origin server URL so that
* we can control which creds we fetch.
*
* Azure DevOps has been known to suggest https URLS of the
* form "https://<account>@dev.azure.com/<account>/<path>".
*
* Break that so that we can force the use of a PAT.
*/
gh__global.main_url = transport_anonymize_url(gh__global.remote->url[0]);
trace2_data_string(TR2_CAT, NULL, "remote/url", gh__global.main_url);
}
static void do__http_get__gvfs_config(struct gh__response_status *status,
struct strbuf *config_data);
/*
* Find the URL of the cache-server, if we have one.
*
* This routine is called by the initialization code and is allowed
* to call die() rather than returning an 'ec'.
*/
static void select_cache_server(void)
{
struct gh__response_status status = GH__RESPONSE_STATUS_INIT;
struct strbuf config_data = STRBUF_INIT;
const char *match = NULL;
/*
* This only indicates that the sub-command actually called
* this routine. We rely on gh__global.cache_server_url to tell
* us if we actually have a cache-server configured.
*/
gh__global.cache_server_is_initialized = 1;
gh__global.cache_server_url = NULL;
if (gh__cmd_opts.cache_server_mode == GH__CACHE_SERVER_MODE__DISABLE) {
trace2_data_string(TR2_CAT, NULL, "cache/url", "disabled");
return;
}
if (!gvfs_cache_server_url || !*gvfs_cache_server_url) {
switch (gh__cmd_opts.cache_server_mode) {
default:
case GH__CACHE_SERVER_MODE__TRUST_WITHOUT_VERIFY:
case GH__CACHE_SERVER_MODE__VERIFY_DISABLE:
trace2_data_string(TR2_CAT, NULL, "cache/url", "unset");
return;
case GH__CACHE_SERVER_MODE__VERIFY_ERROR:
die("cache-server not set");
}
}
/*
* If the cache-server and main Git server have the same URL, we
* can silently disable the cache-server (by NOT setting the field
* in gh__global and explicitly disable the fallback logic.)
*/
if (!strcmp(gvfs_cache_server_url, gh__global.main_url)) {
gh__cmd_opts.try_fallback = 0;
trace2_data_string(TR2_CAT, NULL, "cache/url", "same");
return;
}
if (gh__cmd_opts.cache_server_mode ==
GH__CACHE_SERVER_MODE__TRUST_WITHOUT_VERIFY) {
gh__global.cache_server_url = gvfs_cache_server_url;
trace2_data_string(TR2_CAT, NULL, "cache/url",
gvfs_cache_server_url);
return;
}
/*
* GVFS cache-servers use the main Git server's creds rather
* than having their own creds. This feels like a security
* hole. For example, if the cache-server URL is pointed to a
* bad site, we'll happily send them our creds to the main Git
* server with each request to the cache-server. This would
* allow an attacker to later use our creds to impersonate us
* on the main Git server.
*
* So we optionally verify that the URL to the cache-server is
* well-known by the main Git server.
*/
do__http_get__gvfs_config(&status, &config_data);
if (status.ec == GH__ERROR_CODE__OK) {
/*
* The gvfs/config response is in JSON, but I don't think
* we need to parse it and all that. Lets just do a simple
* strstr() and assume it is sufficient.
*
* We do add some context to the pattern to guard against
* some attacks.
*/
struct strbuf pattern = STRBUF_INIT;
strbuf_addf(&pattern, "\"Url\":\"%s\"", gvfs_cache_server_url);
match = strstr(config_data.buf, pattern.buf);
strbuf_release(&pattern);
}
strbuf_release(&config_data);
if (match) {
gh__global.cache_server_url = gvfs_cache_server_url;
trace2_data_string(TR2_CAT, NULL, "cache/url",
gvfs_cache_server_url);
}
else if (gh__cmd_opts.cache_server_mode ==
GH__CACHE_SERVER_MODE__VERIFY_ERROR) {
if (status.ec != GH__ERROR_CODE__OK)
die("could not verify cache-server '%s': %s",
gvfs_cache_server_url,
status.error_message.buf);
else
die("could not verify cache-server '%s'",
gvfs_cache_server_url);
}
else if (gh__cmd_opts.cache_server_mode ==
GH__CACHE_SERVER_MODE__VERIFY_DISABLE) {
if (status.ec != GH__ERROR_CODE__OK)
warning("could not verify cache-server '%s': %s",
gvfs_cache_server_url,
status.error_message.buf);
else
warning("could not verify cache-server '%s'",
gvfs_cache_server_url);
trace2_data_string(TR2_CAT, NULL, "cache/url",
"disabled");
}
gh__response_status__release(&status);
}
/*
* Read stdin until EOF (or a blank line) and add the desired OIDs
* to the oidset.
*
* Stdin should contain a list of OIDs. Lines may have additional
* text following the OID that we ignore.
*/
static unsigned long read_stdin_for_oids(struct oidset *oids)
{
struct object_id oid;
struct strbuf buf_stdin = STRBUF_INIT;
unsigned long count = 0;
do {
if (strbuf_getline(&buf_stdin, stdin) == EOF || !buf_stdin.len)
break;
if (get_oid_hex(buf_stdin.buf, &oid))
continue; /* just silently eat it */
if (!oidset_insert(oids, &oid))
count++;
} while (1);
return count;
}
/*
* Build a complete JSON payload for a gvfs/objects POST request
* containing the first `nr_in_block` OIDs found in the OIDSET
* indexed by the given iterator.
*
* https://github.com/microsoft/VFSForGit/blob/master/Protocol.md
*
* Return the number of OIDs we actually put into the payload.
* If only 1 OID was found, also return it.
*/
static unsigned long build_json_payload__gvfs_objects(
struct json_writer *jw_req,
struct oidset_iter *iter,
unsigned long nr_in_block,
struct object_id *oid_out)
{
unsigned long k;
const struct object_id *oid;
const struct object_id *oid_prev = NULL;
k = 0;
jw_init(jw_req);
jw_object_begin(jw_req, 0);
jw_object_intmax(jw_req, "commitDepth", gh__cmd_opts.depth);
jw_object_inline_begin_array(jw_req, "objectIds");
while (k < nr_in_block && (oid = oidset_iter_next(iter))) {
jw_array_string(jw_req, oid_to_hex(oid));
k++;
oid_prev = oid;
}
jw_end(jw_req);
jw_end(jw_req);
if (oid_out) {
if (k == 1)
oidcpy(oid_out, oid_prev);
else
oidclr(oid_out);
}
return k;
}
/*
* Lookup the creds for the main/origin Git server.
*/
static void lookup_main_creds(void)
{
if (gh__global.main_creds.username && *gh__global.main_creds.username)
return;
credential_from_url(&gh__global.main_creds, gh__global.main_url);
credential_fill(&gh__global.main_creds);
gh__global.main_creds_need_approval = 1;
}
/*
* If we have a set of creds for the main Git server, tell the credential
* manager to throw them away and ask it to reacquire them.
*/
static void refresh_main_creds(void)
{
if (gh__global.main_creds.username && *gh__global.main_creds.username)
credential_reject(&gh__global.main_creds);
lookup_main_creds();
// TODO should we compare before and after values of u/p and
// TODO shortcut reauth if we already know it will fail?
// TODO if so, return a bool if same/different.
}
static void approve_main_creds(void)
{
if (!gh__global.main_creds_need_approval)
return;
credential_approve(&gh__global.main_creds);
gh__global.main_creds_need_approval = 0;
}
/*
* Build a set of creds for the cache-server based upon the main Git
* server (assuming we have a cache-server configured).
*
* That is, we NEVER fill them directly for the cache-server -- we
* only synthesize them from the filled main creds.
*/
static void synthesize_cache_server_creds(void)
{
if (!gh__global.cache_server_is_initialized)
BUG("sub-command did not initialize cache-server vars");
if (!gh__global.cache_server_url)
return;
if (gh__global.cache_creds.username && *gh__global.cache_creds.username)
return;
/*
* Get the main Git server creds so we can borrow the username
* and password when we talk to the cache-server.
*/
lookup_main_creds();
gh__global.cache_creds.username = xstrdup(gh__global.main_creds.username);
gh__global.cache_creds.password = xstrdup(gh__global.main_creds.password);
}
/*
* Flush and refresh the cache-server creds. Because the cache-server
* does not do 401s (or manage creds), we have to reload the main Git
* server creds first.
*
* That is, we NEVER reject them directly because we never filled them.
*/
static void refresh_cache_server_creds(void)
{
credential_clear(&gh__global.cache_creds);
refresh_main_creds();
synthesize_cache_server_creds();
}
/*
* We NEVER approve cache-server creds directly because we never directly
* filled them. However, we should be able to infer that the main ones
* are valid and can approve them if necessary.
*/
static void approve_cache_server_creds(void)
{
approve_main_creds();
}
/*
* Get the pathname to the ODB where we write objects that we download.
*/
static void select_odb(void)
{
prepare_alt_odb(the_repository);
strbuf_init(&gh__global.buf_odb_path, 0);
if (gvfs_shared_cache_pathname.len)
strbuf_addbuf(&gh__global.buf_odb_path,
&gvfs_shared_cache_pathname);
else
strbuf_addstr(&gh__global.buf_odb_path,
the_repository->objects->odb->path);
}
/*
* Create a unique tempfile or tempfile-pair inside the
* tempPacks directory.
*/
static void my_create_tempfile(
struct gh__response_status *status,
int b_fdopen,
const char *suffix1, struct tempfile **t1,
const char *suffix2, struct tempfile **t2)
{
static unsigned int nth = 0;
static struct timeval tv = {0};
static struct tm tm = {0};
static time_t secs = 0;
static char date[32] = {0};
struct strbuf basename = STRBUF_INIT;
struct strbuf buf = STRBUF_INIT;
int len_tp;
enum scld_error scld;
int retries;
gh__response_status__zero(status);
if (!nth) {
/*
* Create a unique <date> string to use in the name of all
* tempfiles created by this process.
*/
gettimeofday(&tv, NULL);
secs = tv.tv_sec;
gmtime_r(&secs, &tm);
xsnprintf(date, sizeof(date), "%4d%02d%02d-%02d%02d%02d-%06ld",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec,
(long)tv.tv_usec);
}
/*
* Create a <basename> for this instance/pair using a series
* number <n>.
*/
strbuf_addf(&basename, "t-%s-%04d", date, nth++);
if (!suffix1 || !*suffix1)
suffix1 = "temp";
/*
* Create full pathname as:
*
* "<odb>/pack/tempPacks/<basename>.<suffix1>"
*/
strbuf_setlen(&buf, 0);
strbuf_addbuf(&buf, &gh__global.buf_odb_path);
strbuf_complete(&buf, '/');
strbuf_addstr(&buf, "pack/tempPacks/");
len_tp = buf.len;
strbuf_addf( &buf, "%s.%s", basename.buf, suffix1);
scld = safe_create_leading_directories(buf.buf);
if (scld != SCLD_OK && scld != SCLD_EXISTS) {
strbuf_addf(&status->error_message,
"could not create directory for tempfile: '%s'",
buf.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_CREATE_TEMPFILE;
goto cleanup;
}
retries = 0;
*t1 = create_tempfile(buf.buf);
while (!*t1 && retries < 5) {
retries++;
strbuf_setlen(&buf, len_tp);
strbuf_addf(&buf, "%s-%d.%s", basename.buf, retries, suffix1);
*t1 = create_tempfile(buf.buf);
}
if (!*t1) {
strbuf_addf(&status->error_message,
"could not create tempfile: '%s'",
buf.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_CREATE_TEMPFILE;
goto cleanup;
}
if (b_fdopen)
fdopen_tempfile(*t1, "w");
/*
* Optionally create a peer tempfile with the same basename.
* (This is useful for prefetching .pack and .idx pairs.)
*
* "<odb>/pack/tempPacks/<basename>.<suffix2>"
*/
if (suffix2 && *suffix2 && t2) {
strbuf_setlen(&buf, len_tp);
strbuf_addf( &buf, "%s.%s", basename.buf, suffix2);
*t2 = create_tempfile(buf.buf);
while (!*t2 && retries < 5) {
retries++;
strbuf_setlen(&buf, len_tp);
strbuf_addf(&buf, "%s-%d.%s", basename.buf, retries, suffix2);
*t2 = create_tempfile(buf.buf);
}
if (!*t2) {
strbuf_addf(&status->error_message,
"could not create tempfile: '%s'",
buf.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_CREATE_TEMPFILE;
goto cleanup;
}
if (b_fdopen)
fdopen_tempfile(*t2, "w");
}
cleanup:
strbuf_release(&buf);
strbuf_release(&basename);
}
/*
* Create pathnames to the final location of the .pack and .idx
* files in the ODB. These are of the form:
*
* "<odb>/pack/<term_1>-<term_2>[-<term_3>].<suffix>"
*
* For example, for prefetch packs, <term_2> will be the epoch
* timestamp and <term_3> will be the packfile hash.
*/
static void create_final_packfile_pathnames(
const char *term_1, const char *term_2, const char *term_3,
struct strbuf *pack_path, struct strbuf *idx_path,
struct strbuf *pack_filename)
{
struct strbuf base = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
if (term_3 && *term_3)
strbuf_addf(&base, "%s-%s-%s", term_1, term_2, term_3);
else
strbuf_addf(&base, "%s-%s", term_1, term_2);
strbuf_setlen(pack_filename, 0);
strbuf_addf( pack_filename, "%s.pack", base.buf);
strbuf_addbuf(&path, &gh__global.buf_odb_path);
strbuf_complete(&path, '/');
strbuf_addstr(&path, "pack/");
strbuf_setlen(pack_path, 0);
strbuf_addbuf(pack_path, &path);
strbuf_addf( pack_path, "%s.pack", base.buf);
strbuf_setlen(idx_path, 0);
strbuf_addbuf(idx_path, &path);
strbuf_addf( idx_path, "%s.idx", base.buf);
strbuf_release(&base);
strbuf_release(&path);
}
/*
* Create a pathname to the loose object in the shared-cache ODB
* with the given OID. Try to "mkdir -p" to ensure the parent
* directories exist.
*/
static int create_loose_pathname_in_odb(struct strbuf *buf_path,
const struct object_id *oid)
{
enum scld_error scld;
const char *hex;
hex = oid_to_hex(oid);
strbuf_setlen(buf_path, 0);
strbuf_addbuf(buf_path, &gh__global.buf_odb_path);
strbuf_complete(buf_path, '/');
strbuf_add(buf_path, hex, 2);
strbuf_addch(buf_path, '/');
strbuf_addstr(buf_path, hex+2);
scld = safe_create_leading_directories(buf_path->buf);
if (scld != SCLD_OK && scld != SCLD_EXISTS)
return -1;
return 0;
}
static void my_run_index_pack(struct gh__request_params *params,
struct gh__response_status *status,
const struct strbuf *temp_path_pack,
const struct strbuf *temp_path_idx,
struct strbuf *packfile_checksum)
{
struct child_process ip = CHILD_PROCESS_INIT;
struct strbuf ip_stdout = STRBUF_INIT;
strvec_push(&ip.args, "git");
strvec_push(&ip.args, "index-pack");
if (gh__cmd_opts.show_progress) {
strvec_push(&ip.args, "-v");
ip.err = 0;
} else {
ip.err = -1;
ip.no_stderr = 1;
}
strvec_pushl(&ip.args, "-o", temp_path_idx->buf, NULL);
strvec_push(&ip.args, temp_path_pack->buf);
ip.no_stdin = 1;
ip.out = -1;
if (pipe_command(&ip, NULL, 0, &ip_stdout, 0, NULL, 0)) {
unlink(temp_path_pack->buf);
unlink(temp_path_idx->buf);
strbuf_addf(&status->error_message,
"index-pack failed on '%s'",
temp_path_pack->buf);
/*
* Lets assume that index-pack failed because the
* downloaded file is corrupt (truncated).
*
* Retry it as if the network had dropped.
*/
status->retry = GH__RETRY_MODE__TRANSIENT;
status->ec = GH__ERROR_CODE__INDEX_PACK_FAILED;
goto cleanup;
}
if (packfile_checksum) {
/*
* stdout from index-pack should have the packfile hash.
* Extract it and use it in the final packfile name.
*
* TODO What kind of validation should we do on the
* TODO string and is there ever any other output besides
* TODO just the checksum ?
*/
strbuf_trim_trailing_newline(&ip_stdout);
strbuf_addbuf(packfile_checksum, &ip_stdout);
}
cleanup:
strbuf_release(&ip_stdout);
child_process_clear(&ip);
}
static void my_finalize_packfile(struct gh__request_params *params,
struct gh__response_status *status,
int b_keep,
const struct strbuf *temp_path_pack,
const struct strbuf *temp_path_idx,
struct strbuf *final_path_pack,
struct strbuf *final_path_idx,
struct strbuf *final_filename)
{
/*
* Install the .pack and .idx into the ODB pack directory.
*
* We might be racing with other instances of gvfs-helper if
* we, in parallel, both downloaded the exact same packfile
* (with the same checksum SHA) and try to install it at the
* same time. This might happen on Windows where the loser
* can get an EBUSY or EPERM trying to move/rename the
* tempfile into the pack dir, for example.
*
* So, we always install the .pack before the .idx for
* consistency. And only if *WE* created the .pack and .idx
* files, do we create the matching .keep (when requested).
*
* If we get an error and the target files already exist, we
* silently eat the error. Note that finalize_object_file()
* has already munged errno (and it has various creation
* strategies), so we don't bother looking at it.
*/
if (finalize_object_file(temp_path_pack->buf, final_path_pack->buf) ||
finalize_object_file(temp_path_idx->buf, final_path_idx->buf)) {
unlink(temp_path_pack->buf);
unlink(temp_path_idx->buf);
if (file_exists(final_path_pack->buf) &&
file_exists(final_path_idx->buf)) {
trace2_printf("%s: assuming ok for %s", TR2_CAT, final_path_pack->buf);
goto assume_ok;
}
strbuf_addf(&status->error_message,
"could not install packfile '%s'",
final_path_pack->buf);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_PACKFILE;
return;
}
if (b_keep) {
struct strbuf keep = STRBUF_INIT;
int fd_keep;
strbuf_addbuf(&keep, final_path_pack);
strbuf_strip_suffix(&keep, ".pack");
strbuf_addstr(&keep, ".keep");
fd_keep = xopen(keep.buf, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (fd_keep >= 0)
close(fd_keep);
strbuf_release(&keep);
}
assume_ok:
if (params->result_list) {
struct strbuf result_msg = STRBUF_INIT;
strbuf_addf(&result_msg, "packfile %s", final_filename->buf);
string_list_append(params->result_list, result_msg.buf);
strbuf_release(&result_msg);
}
}
/*
* Convert the tempfile into a temporary .pack, index it into a temporary .idx
* file, and then install the pair into ODB.
*/
static void install_packfile(struct gh__request_params *params,
struct gh__response_status *status)
{
struct strbuf temp_path_pack = STRBUF_INIT;
struct strbuf temp_path_idx = STRBUF_INIT;
struct strbuf packfile_checksum = STRBUF_INIT;
struct strbuf final_path_pack = STRBUF_INIT;
struct strbuf final_path_idx = STRBUF_INIT;
struct strbuf final_filename = STRBUF_INIT;
gh__response_status__zero(status);
/*
* After the download is complete, we will need to steal the file
* from the tempfile() class (so that it doesn't magically delete
* it when we close the file handle) and then index it.
*/
strbuf_addf(&temp_path_pack, "%s.pack",
get_tempfile_path(params->tempfile));
strbuf_addf(&temp_path_idx, "%s.idx",
get_tempfile_path(params->tempfile));
if (rename_tempfile(&params->tempfile,
temp_path_pack.buf) == -1) {
strbuf_addf(&status->error_message,
"could not rename packfile to '%s'",
temp_path_pack.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_PACKFILE;
goto cleanup;
}
my_run_index_pack(params, status, &temp_path_pack, &temp_path_idx,
&packfile_checksum);
if (status->ec != GH__ERROR_CODE__OK)
goto cleanup;
create_final_packfile_pathnames("vfs", packfile_checksum.buf, NULL,
&final_path_pack, &final_path_idx,
&final_filename);
my_finalize_packfile(params, status, 0,
&temp_path_pack, &temp_path_idx,
&final_path_pack, &final_path_idx,
&final_filename);
cleanup:
strbuf_release(&temp_path_pack);
strbuf_release(&temp_path_idx);
strbuf_release(&packfile_checksum);
strbuf_release(&final_path_pack);
strbuf_release(&final_path_idx);
strbuf_release(&final_filename);
}
/*
* bswap.h only defines big endian functions.
* The GVFS Protocol defines fields in little endian.
*/
static inline uint64_t my_get_le64(uint64_t le_val)
{
#if GIT_BYTE_ORDER == GIT_LITTLE_ENDIAN
return le_val;
#else
return default_bswap64(le_val);
#endif
}
#define MY_MIN(x,y) (((x) < (y)) ? (x) : (y))
#define MY_MAX(x,y) (((x) > (y)) ? (x) : (y))
/*
* Copy the `nr_bytes_total` from `fd_in` to `fd_out`.
*
* This could be used to extract a single packfile from
* a multipart file, for example.
*/
static int my_copy_fd_len(int fd_in, int fd_out, ssize_t nr_bytes_total)
{
char buffer[8192];
while (nr_bytes_total > 0) {
ssize_t len_to_read = MY_MIN(nr_bytes_total, sizeof(buffer));
ssize_t nr_read = xread(fd_in, buffer, len_to_read);
if (!nr_read)
break;
if (nr_read < 0)
return -1;
if (write_in_full(fd_out, buffer, nr_read) < 0)
return -1;
nr_bytes_total -= nr_read;
}
return 0;
}
/*
* Copy the `nr_bytes_total` from `fd_in` to `fd_out` AND save the
* final `tail_len` bytes in the given buffer.
*
* This could be used to extract a single packfile from
* a multipart file and read the final SHA into the buffer.
*/
static int my_copy_fd_len_tail(int fd_in, int fd_out, ssize_t nr_bytes_total,
unsigned char *buf_tail, ssize_t tail_len)
{
memset(buf_tail, 0, tail_len);
if (my_copy_fd_len(fd_in, fd_out, nr_bytes_total) < 0)
return -1;
if (nr_bytes_total < tail_len)
return 0;
/* Reset the position to read the tail */
lseek(fd_in, -tail_len, SEEK_CUR);
if (xread(fd_in, (char *)buf_tail, tail_len) != tail_len)
return -1;
return 0;
}
/*
* See the protocol document for the per-packfile header.
*/
struct ph {
uint64_t timestamp;
uint64_t pack_len;
uint64_t idx_len;
};
/*
* Extract the next packfile from the multipack.
* Install {.pack, .idx, .keep} set.
*
* Mark each successfully installed prefetch pack as .keep it as installed
* in case we have errors decoding/indexing later packs within the received
* multipart file. (A later pass can delete the unnecessary .keep files
* from this and any previous invocations.)
*/
static void extract_packfile_from_multipack(
struct gh__request_params *params,
struct gh__response_status *status,
int fd_multipack,
unsigned short k)
{
struct ph ph;
struct tempfile *tempfile_pack = NULL;
struct tempfile *tempfile_idx = NULL;
int result = -1;
int b_no_idx_in_multipack;
struct object_id packfile_checksum;
char hex_checksum[GIT_MAX_HEXSZ + 1];
struct strbuf buf_timestamp = STRBUF_INIT;
struct strbuf temp_path_pack = STRBUF_INIT;
struct strbuf temp_path_idx = STRBUF_INIT;
struct strbuf final_path_pack = STRBUF_INIT;
struct strbuf final_path_idx = STRBUF_INIT;
struct strbuf final_filename = STRBUF_INIT;
if (xread(fd_multipack, &ph, sizeof(ph)) != sizeof(ph)) {
strbuf_addf(&status->error_message,
"could not read header for packfile[%d] in multipack",
k);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_PREFETCH;
goto done;
}
ph.timestamp = my_get_le64(ph.timestamp);
ph.pack_len = my_get_le64(ph.pack_len);
ph.idx_len = my_get_le64(ph.idx_len);
if (!ph.pack_len) {
strbuf_addf(&status->error_message,
"packfile[%d]: zero length packfile?", k);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_PREFETCH;
goto done;
}
b_no_idx_in_multipack = (ph.idx_len == maximum_unsigned_value_of_type(uint64_t) ||
ph.idx_len == 0);
if (b_no_idx_in_multipack) {
my_create_tempfile(status, 0, "pack", &tempfile_pack, NULL, NULL);
if (!tempfile_pack)
goto done;
} else {
/* create a pair of tempfiles with the same basename */
my_create_tempfile(status, 0, "pack", &tempfile_pack, "idx", &tempfile_idx);
if (!tempfile_pack || !tempfile_idx)
goto done;
}
/*
* Copy the current packfile from the open stream and capture
* the checksum.
*
* TODO This assumes that the checksum is SHA1. Fix this if/when
* TODO Git converts to SHA256.
*/
result = my_copy_fd_len_tail(fd_multipack,
get_tempfile_fd(tempfile_pack),
ph.pack_len,
packfile_checksum.hash,
GIT_SHA1_RAWSZ);
packfile_checksum.algo = GIT_HASH_SHA1;
if (result < 0){
strbuf_addf(&status->error_message,
"could not extract packfile[%d] from multipack",
k);
goto done;
}
strbuf_addstr(&temp_path_pack, get_tempfile_path(tempfile_pack));
close_tempfile_gently(tempfile_pack);
oid_to_hex_r(hex_checksum, &packfile_checksum);
if (b_no_idx_in_multipack) {
/*
* The server did not send the corresponding .idx, so
* we have to compute it ourselves.
*/
strbuf_addbuf(&temp_path_idx, &temp_path_pack);
strbuf_strip_suffix(&temp_path_idx, ".pack");
strbuf_addstr(&temp_path_idx, ".idx");
my_run_index_pack(params, status,
&temp_path_pack, &temp_path_idx,
NULL);
if (status->ec != GH__ERROR_CODE__OK)
goto done;
} else {
/*
* Server sent the .idx immediately after the .pack in the
* data stream. I'm tempted to verify it, but that defeats
* the purpose of having it cached...
*/
if (my_copy_fd_len(fd_multipack, get_tempfile_fd(tempfile_idx),
ph.idx_len) < 0) {
strbuf_addf(&status->error_message,
"could not extract index[%d] in multipack",
k);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_PREFETCH;
goto done;
}
strbuf_addstr(&temp_path_idx, get_tempfile_path(tempfile_idx));
close_tempfile_gently(tempfile_idx);
}
strbuf_addf(&buf_timestamp, "%u", (unsigned int)ph.timestamp);
create_final_packfile_pathnames("prefetch", buf_timestamp.buf, hex_checksum,
&final_path_pack, &final_path_idx,
&final_filename);
my_finalize_packfile(params, status, 1,
&temp_path_pack, &temp_path_idx,
&final_path_pack, &final_path_idx,
&final_filename);
done:
delete_tempfile(&tempfile_pack);
delete_tempfile(&tempfile_idx);
strbuf_release(&temp_path_pack);
strbuf_release(&temp_path_idx);
strbuf_release(&final_path_pack);
strbuf_release(&final_path_idx);
strbuf_release(&final_filename);
}
struct keep_files_data {
timestamp_t max_timestamp;
int pos_of_max;
struct string_list *keep_files;
};
static void cb_keep_files(const char *full_path, size_t full_path_len,
const char *file_path, void *void_data)
{
struct keep_files_data *data = void_data;
const char *val;
timestamp_t t;
/*
* We expect prefetch packfiles named like:
*
* prefetch-<seconds>-<checksum>.keep
*/
if (!skip_prefix(file_path, "prefetch-", &val))
return;
if (!ends_with(val, ".keep"))
return;
t = strtol(val, NULL, 10);
if (t > data->max_timestamp) {
data->pos_of_max = data->keep_files->nr;
data->max_timestamp = t;
}
string_list_append(data->keep_files, full_path);
}
static void delete_stale_keep_files(
struct gh__request_params *params,
struct gh__response_status *status)
{
struct string_list keep_files = STRING_LIST_INIT_DUP;
struct keep_files_data data = { 0, 0, &keep_files };
int k;
for_each_file_in_pack_dir(gh__global.buf_odb_path.buf,
cb_keep_files, &data);
for (k = 0; k < keep_files.nr; k++) {
if (k != data.pos_of_max)
unlink(keep_files.items[k].string);
}
string_list_clear(&keep_files, 0);
}
/*
* Cut apart the received multipart response into individual packfiles
* and install each one.
*/
static void install_prefetch(struct gh__request_params *params,
struct gh__response_status *status)
{
static unsigned char v1_h[6] = { 'G', 'P', 'R', 'E', ' ', 0x01 };
struct mh {
unsigned char h[6];
unsigned char np[2];
};
struct mh mh;
unsigned short np;
unsigned short k;
int fd = -1;
int nr_installed = 0;
struct strbuf temp_path_mp = STRBUF_INIT;
/*
* Steal the multi-part file from the tempfile class.
*/
strbuf_addf(&temp_path_mp, "%s.mp", get_tempfile_path(params->tempfile));
if (rename_tempfile(&params->tempfile, temp_path_mp.buf) == -1) {
strbuf_addf(&status->error_message,
"could not rename prefetch tempfile to '%s'",
temp_path_mp.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_PREFETCH;
goto cleanup;
}
fd = git_open_cloexec(temp_path_mp.buf, O_RDONLY);
if (fd == -1) {
strbuf_addf(&status->error_message,
"could not reopen prefetch tempfile '%s'",
temp_path_mp.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_PREFETCH;
goto cleanup;
}
if ((xread(fd, &mh, sizeof(mh)) != sizeof(mh)) ||
(memcmp(mh.h, &v1_h, sizeof(mh.h)))) {
strbuf_addstr(&status->error_message,
"invalid prefetch multipart header");
goto cleanup;
}
np = (unsigned short)mh.np[0] + ((unsigned short)mh.np[1] << 8);
if (np)
trace2_data_intmax(TR2_CAT, NULL,
"prefetch/packfile_count", np);
for (k = 0; k < np; k++) {
extract_packfile_from_multipack(params, status, fd, k);
if (status->ec != GH__ERROR_CODE__OK)
break;
nr_installed++;
}
if (nr_installed)
delete_stale_keep_files(params, status);
cleanup:
if (fd != -1)
close(fd);
unlink(temp_path_mp.buf);
strbuf_release(&temp_path_mp);
}
/*
* Wrapper for read_loose_object() to read and verify the hash of a
* loose object, and discard the contents buffer.
*
* Returns 0 on success, negative on error (details may be written to stderr).
*/
static int verify_loose_object(const char *path,
const struct object_id *expected_oid)
{
enum object_type type;
void *contents = NULL;
unsigned long size;
struct strbuf type_name = STRBUF_INIT;
int ret;
struct object_info oi = OBJECT_INFO_INIT;
struct object_id real_oid = *null_oid();
oi.typep = &type;
oi.sizep = &size;
oi.type_name = &type_name;
ret = read_loose_object(path, expected_oid, &real_oid, &contents, &oi);
if (!ret)
free(contents);
return ret;
}
/*
* Convert the tempfile into a permanent loose object in the ODB.
*/
static void install_loose(struct gh__request_params *params,
struct gh__response_status *status)
{
struct strbuf tmp_path = STRBUF_INIT;
struct strbuf loose_path = STRBUF_INIT;
gh__response_status__zero(status);
/*
* close tempfile to steal ownership away from tempfile class.
*/
strbuf_addstr(&tmp_path, get_tempfile_path(params->tempfile));
close_tempfile_gently(params->tempfile);
/*
* Compute the hash of the received content (while it is still
* in a temp file) and verify that it matches the OID that we
* requested and was not corrupted.
*/
if (verify_loose_object(tmp_path.buf, &params->loose_oid)) {
strbuf_addf(&status->error_message,
"hash failed for received loose object '%s'",
oid_to_hex(&params->loose_oid));
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_LOOSE;
goto cleanup;
}
/*
* Try to install the tempfile as the actual loose object.
*
* If the loose object already exists, finalize_object_file()
* will NOT overwrite/replace it. It will silently eat the
* EEXIST error and unlink the tempfile as it if was
* successful. We just let it lie to us.
*
* Since our job is to back-fill missing objects needed by a
* foreground git process -- git should have called
* oid_object_info_extended() and loose_object_info() BEFORE
* asking us to download the missing object. So if we get a
* collision we have to assume something else is happening in
* parallel and we lost the race. And that's OK.
*/
if (create_loose_pathname_in_odb(&loose_path, &params->loose_oid)) {
strbuf_addf(&status->error_message,
"cannot create directory for loose object '%s'",
loose_path.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_LOOSE;
goto cleanup;
}
if (finalize_object_file(tmp_path.buf, loose_path.buf)) {
unlink(tmp_path.buf);
strbuf_addf(&status->error_message,
"could not install loose object '%s'",
loose_path.buf);
status->ec = GH__ERROR_CODE__COULD_NOT_INSTALL_LOOSE;
goto cleanup;
}
if (params->result_list) {
struct strbuf result_msg = STRBUF_INIT;
strbuf_addf(&result_msg, "loose %s",
oid_to_hex(&params->loose_oid));
string_list_append(params->result_list, result_msg.buf);
strbuf_release(&result_msg);
}
cleanup:
strbuf_release(&tmp_path);
strbuf_release(&loose_path);
}
static void install_result(struct gh__request_params *params,
struct gh__response_status *status)
{
if (params->objects_mode == GH__OBJECTS_MODE__PREFETCH) {
/*
* The "gvfs/prefetch" API is the only thing that sends
* these multi-part packfiles. According to the protocol
* documentation, they will have this x- content type.
*
* However, it appears that there is a BUG in the origin
* server causing it to sometimes send "text/html" instead.
* So, we silently handle both.
*/
if (!strcmp(status->content_type.buf,
"application/x-gvfs-timestamped-packfiles-indexes")) {
install_prefetch(params, status);
return;
}
if (!strcmp(status->content_type.buf, "text/html")) {
install_prefetch(params, status);
return;
}
} else {
if (!strcmp(status->content_type.buf, "application/x-git-packfile")) {
assert(params->b_is_post);
assert(params->objects_mode == GH__OBJECTS_MODE__POST);
install_packfile(params, status);
return;
}
if (!strcmp(status->content_type.buf,
"application/x-git-loose-object")) {
/*
* We get these for "gvfs/objects" GET and POST requests.
*
* Note that this content type is singular, not plural.
*/
install_loose(params, status);
return;
}
}
strbuf_addf(&status->error_message,
"install_result: received unknown content-type '%s'",
status->content_type.buf);
status->ec = GH__ERROR_CODE__UNEXPECTED_CONTENT_TYPE;
}
/*
* Our wrapper to initialize the HTTP layer.
*
* We always use the real origin server, not the cache-server, when
* initializing the http/curl layer.
*/
static void gh_http_init(void)
{
if (gh__global.http_is_initialized)
return;
http_init(gh__global.remote, gh__global.main_url, 0);
gh__global.http_is_initialized = 1;
}
static void gh_http_cleanup(void)
{
if (!gh__global.http_is_initialized)
return;
http_cleanup();
gh__global.http_is_initialized = 0;
}
/*
* buffer has "<key>: <value>[\r]\n"
*/
static void parse_resp_hdr_1(const char *buffer, size_t size, size_t nitems,
struct strbuf *key, struct strbuf *value)
{
const char *end = buffer + (size * nitems);
const char *p;
p = strchr(buffer, ':');
strbuf_setlen(key, 0);
strbuf_add(key, buffer, (p - buffer));
p++; /* skip ':' */
p++; /* skip ' ' */
strbuf_setlen(value, 0);
strbuf_add(value, p, (end - p));
strbuf_trim_trailing_newline(value);
}
static size_t parse_resp_hdr(char *buffer, size_t size, size_t nitems,
void *void_params)
{
struct gh__request_params *params = void_params;
struct gh__azure_throttle *azure = &gh__global_throttle[params->server_type];
if (starts_with(buffer, "X-RateLimit-")) {
struct strbuf key = STRBUF_INIT;
struct strbuf val = STRBUF_INIT;
parse_resp_hdr_1(buffer, size, nitems, &key, &val);
/*
* The following X- headers are specific to AzureDevOps.
* Other servers have similar sets of values, but I haven't
* compared them in depth.
*/
// trace2_printf("%s: Throttle: %s %s", TR2_CAT, key.buf, val.buf);
if (!strcmp(key.buf, "X-RateLimit-Resource")) {
/*
* The name of the resource that is complaining.
* Just log it because we can't do anything with it.
*/
strbuf_setlen(&key, 0);
strbuf_addstr(&key, "ratelimit/resource");
strbuf_addstr(&key, gh__server_type_label[params->server_type]);
trace2_data_string(TR2_CAT, NULL, key.buf, val.buf);
}
else if (!strcmp(key.buf, "X-RateLimit-Delay")) {
/*
* The amount of delay added to our response.
* Just log it because we can't do anything with it.
*/
unsigned long tarpit_delay_ms;
strbuf_setlen(&key, 0);
strbuf_addstr(&key, "ratelimit/delay_ms");
strbuf_addstr(&key, gh__server_type_label[params->server_type]);
git_parse_ulong(val.buf, &tarpit_delay_ms);
trace2_data_intmax(TR2_CAT, NULL, key.buf, tarpit_delay_ms);
}
else if (!strcmp(key.buf, "X-RateLimit-Limit")) {
/*
* The resource limit/quota before we get a 429.
*/
git_parse_ulong(val.buf, &azure->tstu_limit);
}
else if (!strcmp(key.buf, "X-RateLimit-Remaining")) {
/*
* The amount of our quota remaining. When zero, we
* should get 429s on futher requests until the reset
* time.
*/
git_parse_ulong(val.buf, &azure->tstu_remaining);
}
else if (!strcmp(key.buf, "X-RateLimit-Reset")) {
/*
* The server gave us a time-in-seconds-since-the-epoch
* for when our quota will be reset (if we stop all
* activity right now).
*
* Checkpoint the local system clock so we can do some
* sanity checks on any clock skew. Also, since we get
* the headers before we get the content, we can adjust
* our delay to compensate for the full download time.
*/
unsigned long now = time(NULL);
unsigned long reset_time;
git_parse_ulong(val.buf, &reset_time);
if (reset_time > now)
azure->reset_sec = reset_time - now;
}
strbuf_release(&key);
strbuf_release(&val);
}
else if (starts_with(buffer, "Retry-After")) {
struct strbuf key = STRBUF_INIT;
struct strbuf val = STRBUF_INIT;
parse_resp_hdr_1(buffer, size, nitems, &key, &val);
/*
* We get this header with a 429 and 503 and possibly a 30x.
*
* Curl does have CURLINFO_RETRY_AFTER that nicely parses and
* normalizes the value (and supports HTTP/1.1 usage), but it
* is not present yet in the version shipped with the Mac, so
* we do it directly here.
*/
git_parse_ulong(val.buf, &azure->retry_after_sec);
strbuf_release(&key);
strbuf_release(&val);
}
else if (starts_with(buffer, "X-VSS-E2EID")) {
struct strbuf key = STRBUF_INIT;
/*
* Capture the E2EID as it goes by, but don't log it until we
* know the request result.
*/
parse_resp_hdr_1(buffer, size, nitems, &key, &params->e2eid);
strbuf_release(&key);
}
return nitems * size;
}
/*
* Wait "duration" seconds and drive the progress mechanism.
*
* We spin slightly faster than we need to to keep the progress bar
* drawn (especially if the user presses return while waiting) and to
* compensate for delay factors built into the progress class (which
* might wait for 2 seconds before drawing the first message).
*/
static void do_throttle_spin(struct gh__request_params *params,
const char *tr2_label,
const char *progress_msg,
int duration)
{
struct strbuf region = STRBUF_INIT;
struct progress *progress = NULL;
unsigned long begin = time(NULL);
unsigned long now = begin;
unsigned long end = begin + duration;
strbuf_addstr(&region, tr2_label);
strbuf_addstr(&region, gh__server_type_label[params->server_type]);
trace2_region_enter(TR2_CAT, region.buf, NULL);
if (gh__cmd_opts.show_progress)
progress = start_progress(progress_msg, duration);
while (now < end) {
display_progress(progress, (now - begin));
sleep_millisec(100);
now = time(NULL);
}
display_progress(progress, duration);
stop_progress(&progress);
trace2_region_leave(TR2_CAT, region.buf, NULL);
strbuf_release(&region);
}
/*
* Delay the outbound request if necessary in response to previous throttle
* blockages or hints. Throttle data is somewhat orthogonal to the status
* results from any previous request and/or the request params of the next
* request.
*
* Note that the throttle info also is cross-process information, such as
* 2 concurrent fetches in 2 different terminal windows to the same server
* will be sharing the same server quota. These could be coordinated too,
* so that a blockage received in one process would prevent the other
* process from starting another request (and also blocked or extending
* the delay interval). We're NOT going to do that level of integration.
* We will let both processes independently attempt the next request.
* This may cause us to miss the end-of-quota boundary if the server
* extends it because of the second request.
*
* TODO Should we have a max-wait option and then return a hard-error
* TODO of some type?
*/
static void do_throttle_wait(struct gh__request_params *params,
struct gh__response_status *status)
{
struct gh__azure_throttle *azure =
&gh__global_throttle[params->server_type];
if (azure->retry_after_sec) {
/*
* We were given a hard delay (such as after a 429).
* Spin until the requested time.
*/
do_throttle_spin(params, "throttle/hard",
"Waiting on hard throttle (sec)",
azure->retry_after_sec);
return;
}
if (azure->reset_sec > 0) {
/*
* We were given a hint that we are overloading
* the server. Voluntarily backoff (before we
* get tarpitted or blocked).
*/
do_throttle_spin(params, "throttle/soft",
"Waiting on soft throttle (sec)",
azure->reset_sec);
return;
}
if (params->k_transient_delay_sec) {
/*
* Insert an arbitrary delay before retrying after a
* transient (network) failure.
*/
do_throttle_spin(params, "throttle/transient",
"Waiting to retry after network error (sec)",
params->k_transient_delay_sec);
return;
}
}
static void set_main_creds_on_slot(struct active_request_slot *slot,
const struct credential *creds)
{
assert(creds == &gh__global.main_creds);
/*
* When talking to the main/origin server, we have 3 modes
* of operation:
*
* [1] The initial request is sent without loading creds
* and with ANY-AUTH set. (And the `":"` is a magic
* value.)
*
* This allows libcurl to negotiate for us if it can.
* For example, this allows NTLM to work by magic and
* we get 200s without ever seeing a 401. If libcurl
* cannot negotiate for us, it gives us a 401 (and all
* of the 401 code in this file responds to that).
*
* [2] A 401 retry will load the main creds and try again.
* This causes `creds->username`to be non-NULL (even
* if refers to a zero-length string). And we assume
* BASIC Authentication. (And a zero-length username
* is a convention for PATs, but then sometimes users
* put the PAT in their `username` field and leave the
* `password` field blank. And that works too.)
*
* [3] Subsequent requests on the same connection use
* whatever worked before.
*/
if (creds && creds->username) {
curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_easy_setopt(slot->curl, CURLOPT_USERNAME, creds->username);
curl_easy_setopt(slot->curl, CURLOPT_PASSWORD, creds->password);
} else {
curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_easy_setopt(slot->curl, CURLOPT_USERPWD, ":");
}
}
static void set_cache_server_creds_on_slot(struct active_request_slot *slot,
const struct credential *creds)
{
assert(creds == &gh__global.cache_creds);
assert(creds->username);
/*
* Things are weird when talking to a cache-server:
*
* [1] They don't send 401s on an auth error, rather they send
* a 400 (with a nice human-readable string in the html body).
* This prevents libcurl from doing any negotiation for us.
*
* [2] Cache-servers don't manage their own passwords, but
* rather require us to send the Basic Authentication
* username & password that we would send to the main
* server. (So yes, we have to get creds validated
* against the main server creds and substitute them when
* talking to the cache-server.)
*
* This means that:
*
* [a] We cannot support cache-servers that want to use NTLM.
*
* [b] If we want to talk to a cache-server, we have get the
* Basic Auth creds for the main server. And this may be
* problematic if the libcurl and/or the credential manager
* insists on using NTLM and prevents us from getting them.
*
* So we never try AUTH-ANY and force Basic Auth (if possible).
*/
if (creds && creds->username) {
curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_easy_setopt(slot->curl, CURLOPT_USERNAME, creds->username);
curl_easy_setopt(slot->curl, CURLOPT_PASSWORD, creds->password);
}
}
/*
* Do a single HTTP request WITHOUT robust-retry, auth-retry or fallback.
*/
static void do_req(const char *url_base,
const char *url_component,
const struct credential *creds,
struct gh__request_params *params,
struct gh__response_status *status)
{
struct active_request_slot *slot;
struct slot_results results;
struct strbuf rest_url = STRBUF_INIT;
gh__response_status__zero(status);
if (params->b_write_to_file) {
/* Delete dirty tempfile from a previous attempt. */
if (params->tempfile)
delete_tempfile(&params->tempfile);
my_create_tempfile(status, 1, NULL, &params->tempfile, NULL, NULL);
if (!params->tempfile || status->ec != GH__ERROR_CODE__OK)
return;
} else {
/* Guard against caller using dirty buffer */
strbuf_setlen(params->buffer, 0);
}
end_url_with_slash(&rest_url, url_base);
strbuf_addstr(&rest_url, url_component);
do_throttle_wait(params, status);
gh__azure_throttle__zero(&gh__global_throttle[params->server_type]);
slot = get_active_slot();
slot->results = &results;
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0); /* not a HEAD request */
curl_easy_setopt(slot->curl, CURLOPT_URL, rest_url.buf);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, params->headers);
if (params->b_is_post) {
curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS,
params->post_payload->buf);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE,
(long)params->post_payload->len);
} else {
curl_easy_setopt(slot->curl, CURLOPT_POST, 0);
}
if (params->b_write_to_file) {
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA,
(void*)params->tempfile->fp);
} else {
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_FILE, params->buffer);
}
curl_easy_setopt(slot->curl, CURLOPT_HEADERFUNCTION, parse_resp_hdr);
curl_easy_setopt(slot->curl, CURLOPT_HEADERDATA, params);
if (params->server_type == GH__SERVER_TYPE__MAIN)
set_main_creds_on_slot(slot, creds);
else
set_cache_server_creds_on_slot(slot, creds);
if (params->progress_base_phase2_msg.len ||
params->progress_base_phase3_msg.len) {
curl_easy_setopt(slot->curl, CURLOPT_XFERINFOFUNCTION,
gh__curl_progress_cb);
curl_easy_setopt(slot->curl, CURLOPT_XFERINFODATA, params);
curl_easy_setopt(slot->curl, CURLOPT_NOPROGRESS, 0);
} else {
curl_easy_setopt(slot->curl, CURLOPT_NOPROGRESS, 1);
}
gh__run_one_slot(slot, params, status);
}
/*
* Compute the delay for the nth attempt.
*
* No delay for the first attempt. Then use a normal exponential backoff
* starting from 8.
*/
static int compute_transient_delay(int attempt)
{
int v;
if (attempt < 1)
return 0;
/*
* Let 8K be our hard limit (for integer overflow protection).
* That's over 2 hours. This is 8<<10.
*/
if (attempt > 10)
attempt = 10;
v = 8 << (attempt - 1);
if (v > gh__cmd_opts.max_transient_backoff_sec)
v = gh__cmd_opts.max_transient_backoff_sec;
return v;
}
/*
* Robustly make an HTTP request. Retry if necessary to hide common
* transient network errors and/or 429 blockages.
*
* For a transient (network) failure (where we do not have a throttle
* delay factor), we should insert a small delay to let the network
* recover. The outage might be because the VPN dropped, or the
* machine went to sleep or something and we want to give the network
* time to come back up. Insert AI here :-)
*/
static void do_req__with_robust_retry(const char *url_base,
const char *url_component,
const struct credential *creds,
struct gh__request_params *params,
struct gh__response_status *status)
{
for (params->k_attempt = 0;
params->k_attempt < gh__cmd_opts.max_retries + 1;
params->k_attempt++) {
do_req(url_base, url_component, creds, params, status);
switch (status->retry) {
default:
case GH__RETRY_MODE__SUCCESS:
case GH__RETRY_MODE__HTTP_401: /* caller does auth-retry */
case GH__RETRY_MODE__HARD_FAIL:
case GH__RETRY_MODE__FAIL_404:
return;
case GH__RETRY_MODE__HTTP_429:
case GH__RETRY_MODE__HTTP_503:
/*
* We should have gotten a "Retry-After" header with
* these and that gives us the wait time. If not,
* fallthru and use the backoff delay.
*/
if (gh__global_throttle[params->server_type].retry_after_sec)
continue;
/*fallthru*/
case GH__RETRY_MODE__TRANSIENT:
params->k_transient_delay_sec =
compute_transient_delay(params->k_attempt);
continue;
}
}
}
static void do_req__to_main(const char *url_component,
struct gh__request_params *params,
struct gh__response_status *status)
{
params->server_type = GH__SERVER_TYPE__MAIN;
/*
* When talking to the main Git server, we DO NOT preload the
* creds before the first request.
*/
do_req__with_robust_retry(gh__global.main_url, url_component,
&gh__global.main_creds,
params, status);
if (status->retry == GH__RETRY_MODE__HTTP_401) {
refresh_main_creds();
do_req__with_robust_retry(gh__global.main_url, url_component,
&gh__global.main_creds,
params, status);
}
if (status->retry == GH__RETRY_MODE__SUCCESS)
approve_main_creds();
}
static void do_req__to_cache_server(const char *url_component,
struct gh__request_params *params,
struct gh__response_status *status)
{
params->server_type = GH__SERVER_TYPE__CACHE;
/*
* When talking to a cache-server, DO force load the creds.
* This implicitly preloads the creds to the main server.
*/
synthesize_cache_server_creds();
do_req__with_robust_retry(gh__global.cache_server_url, url_component,
&gh__global.cache_creds,
params, status);
if (status->retry == GH__RETRY_MODE__HTTP_401) {
refresh_cache_server_creds();
do_req__with_robust_retry(gh__global.cache_server_url,
url_component,
&gh__global.cache_creds,
params, status);
}
if (status->retry == GH__RETRY_MODE__SUCCESS)
approve_cache_server_creds();
}
/*
* Try the cache-server (if configured) then fall-back to the main Git server.
*/
static void do_req__with_fallback(const char *url_component,
struct gh__request_params *params,
struct gh__response_status *status)
{
if (gh__global.cache_server_url &&
params->b_permit_cache_server_if_defined) {
do_req__to_cache_server(url_component, params, status);
if (status->retry == GH__RETRY_MODE__SUCCESS)
return;
if (!gh__cmd_opts.try_fallback)
return;
/*
* The cache-server shares creds with the main Git server,
* so if our creds failed against the cache-server, they
* will also fail against the main Git server. We just let
* this fail.
*
* Falling-back would likely just cause the 3rd (or maybe
* 4th) cred prompt.
*/
if (status->retry == GH__RETRY_MODE__HTTP_401)
return;
}
do_req__to_main(url_component, params, status);
}
/*
* Call "gvfs/config" REST API.
*
* Return server's response buffer. This is probably a raw JSON string.
*/
static void do__http_get__simple_endpoint(struct gh__response_status *status,
struct strbuf *response,
const char *endpoint,
const char *tr2_label)
{
struct gh__request_params params = GH__REQUEST_PARAMS_INIT;
strbuf_addstr(&params.tr2_label, tr2_label);
params.b_is_post = 0;
params.b_write_to_file = 0;
/* cache-servers do not handle gvfs/config REST calls */
params.b_permit_cache_server_if_defined = 0;
params.buffer = response;
params.objects_mode = GH__OBJECTS_MODE__NONE;
params.object_count = 1; /* a bit of a lie */
/*
* "X-TFS-FedAuthRedirect: Suppress" disables the 302 + 203 redirect
* sequence to a login page and forces the main Git server to send a
* normal 401.
*/
params.headers = http_copy_default_headers();
params.headers = curl_slist_append(params.headers,
"X-TFS-FedAuthRedirect: Suppress");
params.headers = curl_slist_append(params.headers,
"Pragma: no-cache");
if (gh__cmd_opts.show_progress) {
/*
* gvfs/config has a very small reqest payload, so I don't
* see any need to report progress on the upload side of
* the GET. So just report progress on the download side.
*/
strbuf_addf(&params.progress_base_phase3_msg,
"Receiving %s", endpoint);
}
do_req__with_fallback(endpoint, &params, status);
gh__request_params__release(&params);
}
static void do__http_get__gvfs_config(struct gh__response_status *status,
struct strbuf *config_data)
{
do__http_get__simple_endpoint(status, config_data, "gvfs/config",
"GET/config");
}
static void setup_gvfs_objects_progress(struct gh__request_params *params,
unsigned long num, unsigned long den)
{
if (!gh__cmd_opts.show_progress)
return;
if (params->b_is_post) {
strbuf_addf(&params->progress_base_phase3_msg,
"Receiving packfile %ld/%ld with %ld objects",
num, den, params->object_count);
}
/* If requesting only one object, then do not show progress */
}
/*
* Call "gvfs/objects/<oid>" REST API to fetch a loose object
* and write it to the ODB.
*/
static void do__http_get__gvfs_object(struct gh__response_status *status,
const struct object_id *oid,
unsigned long l_num, unsigned long l_den,
struct string_list *result_list)
{
struct gh__request_params params = GH__REQUEST_PARAMS_INIT;
struct strbuf component_url = STRBUF_INIT;
gh__response_status__zero(status);
strbuf_addf(&component_url, "gvfs/objects/%s", oid_to_hex(oid));
strbuf_addstr(&params.tr2_label, "GET/objects");
params.b_is_post = 0;
params.b_write_to_file = 1;
params.b_permit_cache_server_if_defined = 1;
params.objects_mode = GH__OBJECTS_MODE__GET;
params.object_count = 1;
params.result_list = result_list;
params.headers = http_copy_default_headers();
params.headers = curl_slist_append(params.headers,
"X-TFS-FedAuthRedirect: Suppress");
params.headers = curl_slist_append(params.headers,
"Pragma: no-cache");
oidcpy(&params.loose_oid, oid);
setup_gvfs_objects_progress(&params, l_num, l_den);
do_req__with_fallback(component_url.buf, &params, status);
gh__request_params__release(&params);
strbuf_release(&component_url);
}
/*
* Call "gvfs/objects" POST REST API to fetch a batch of objects
* from the OIDSET. Normal, this is results in a packfile containing
* `nr_wanted_in_block` objects. And we return the number actually
* consumed (along with the filename of the resulting packfile).
*
* However, if we only have 1 oid (remaining) in the OIDSET, the
* server *MAY* respond to our POST with a loose object rather than
* a packfile with 1 object.
*
* Append a message to the result_list describing the result.
*
* Return the number of OIDs consumed from the OIDSET.
*/
static void do__http_post__gvfs_objects(struct gh__response_status *status,
struct oidset_iter *iter,
unsigned long nr_wanted_in_block,
int j_pack_num, int j_pack_den,
struct string_list *result_list,
unsigned long *nr_oid_taken)
{
struct json_writer jw_req = JSON_WRITER_INIT;
struct gh__request_params params = GH__REQUEST_PARAMS_INIT;
gh__response_status__zero(status);
params.object_count = build_json_payload__gvfs_objects(
&jw_req, iter, nr_wanted_in_block, &params.loose_oid);
*nr_oid_taken = params.object_count;
strbuf_addstr(&params.tr2_label, "POST/objects");
params.b_is_post = 1;
params.b_write_to_file = 1;
params.b_permit_cache_server_if_defined = 1;
params.objects_mode = GH__OBJECTS_MODE__POST;
params.post_payload = &jw_req.json;
params.result_list = result_list;
params.headers = http_copy_default_headers();
params.headers = curl_slist_append(params.headers,
"X-TFS-FedAuthRedirect: Suppress");
params.headers = curl_slist_append(params.headers,
"Pragma: no-cache");
params.headers = curl_slist_append(params.headers,
"Content-Type: application/json");
/*
* If our POST contains more than one object, we want the
* server to send us a packfile. We DO NOT want the non-standard
* concatenated loose object format, so we DO NOT send:
* "Accept: application/x-git-loose-objects" (plural)
*
* However, if the payload only requests 1 OID, the server
* will send us a single loose object instead of a packfile,
* so we ACK that and send:
* "Accept: application/x-git-loose-object" (singular)
*/
params.headers = curl_slist_append(params.headers,
"Accept: application/x-git-packfile");
params.headers = curl_slist_append(params.headers,
"Accept: application/x-git-loose-object");
setup_gvfs_objects_progress(&params, j_pack_num, j_pack_den);
do_req__with_fallback("gvfs/objects", &params, status);
gh__request_params__release(&params);
jw_release(&jw_req);
}
struct find_last_data {
timestamp_t timestamp;
int nr_files;
};
static void cb_find_last(const char *full_path, size_t full_path_len,
const char *file_path, void *void_data)
{
struct find_last_data *data = void_data;
const char *val;
timestamp_t t;
if (!skip_prefix(file_path, "prefetch-", &val))
return;
if (!ends_with(val, ".pack"))
return;
data->nr_files++;
/*
* We expect prefetch packfiles named like:
*
* prefetch-<seconds>-<checksum>.pack
*/
t = strtol(val, NULL, 10);
data->timestamp = MY_MAX(t, data->timestamp);
}
/*
* Find the server timestamp on the last prefetch packfile that
* we have in the ODB.
*
* TODO I'm going to assume that all prefetch packs are created
* TODO equal and take the one with the largest t value.
* TODO
* TODO Or should we look for one marked with .keep ?
*
* TODO Alternatively, should we maybe get the 2nd largest?
* TODO (Or maybe subtract an hour delta from the largest?)
* TODO
* TODO Since each cache-server maintains its own set of prefetch
* TODO packs (such that 2 requests may hit 2 different
* TODO load-balanced servers and get different answers (with or
* TODO without clock-skew issues)), is it possible for us to miss
* TODO the absolute fringe of new commits and trees?
* TODO
* TODO That is, since the cache-server generates hourly prefetch
* TODO packs, we could do a prefetch and be up-to-date, but then
* TODO do the main fetch and hit a different cache/main server
* TODO and be behind by as much as an hour and have to demand-
* TODO load the commits/trees.
*
* TODO Alternatively, should we compare the last timestamp found
* TODO with "now" and silently do nothing if within an epsilon?
*/
static void find_last_prefetch_timestamp(timestamp_t *last)
{
struct find_last_data data;
memset(&data, 0, sizeof(data));
for_each_file_in_pack_dir(gh__global.buf_odb_path.buf, cb_find_last, &data);
*last = data.timestamp;
}
/*
* Call "gvfs/prefetch[?lastPackTimestamp=<secondsSinceEpoch>]" REST API to
* fetch a series of packfiles and write them to the ODB.
*
* Return a list of packfile names.
*/
static void do__http_get__gvfs_prefetch(struct gh__response_status *status,
timestamp_t seconds_since_epoch,
struct string_list *result_list)
{
struct gh__request_params params = GH__REQUEST_PARAMS_INIT;
struct strbuf component_url = STRBUF_INIT;
gh__response_status__zero(status);
strbuf_addstr(&component_url, "gvfs/prefetch");
if (!seconds_since_epoch)
find_last_prefetch_timestamp(&seconds_since_epoch);
if (seconds_since_epoch)
strbuf_addf(&component_url, "?lastPackTimestamp=%"PRItime,
seconds_since_epoch);
params.b_is_post = 0;
params.b_write_to_file = 1;
params.b_permit_cache_server_if_defined = 1;
params.objects_mode = GH__OBJECTS_MODE__PREFETCH;
params.object_count = -1;
params.result_list = result_list;
params.headers = http_copy_default_headers();
params.headers = curl_slist_append(params.headers,
"X-TFS-FedAuthRedirect: Suppress");
params.headers = curl_slist_append(params.headers,
"Pragma: no-cache");
params.headers = curl_slist_append(params.headers,
"Accept: application/x-gvfs-timestamped-packfiles-indexes");
if (gh__cmd_opts.show_progress)
strbuf_addf(&params.progress_base_phase3_msg,
"Prefetch %"PRItime" (%s)",
seconds_since_epoch,
show_date(seconds_since_epoch, 0,
DATE_MODE(ISO8601)));
do_req__with_fallback(component_url.buf, &params, status);
gh__request_params__release(&params);
strbuf_release(&component_url);
}
/*
* Drive one or more HTTP GET requests to fetch the objects
* in the given OIDSET. These are received into loose objects.
*
* Accumulate results for each request in `result_list` until we get a
* hard error and have to stop.
*/
static void do__http_get__fetch_oidset(struct gh__response_status *status,
struct oidset *oids,
unsigned long nr_oid_total,
struct string_list *result_list)
{
struct oidset_iter iter;
struct strbuf err404 = STRBUF_INIT;
const struct object_id *oid;
unsigned long k;
int had_404 = 0;
gh__response_status__zero(status);
if (!nr_oid_total)
return;
oidset_iter_init(oids, &iter);
for (k = 0; k < nr_oid_total; k++) {
oid = oidset_iter_next(&iter);
do__http_get__gvfs_object(status, oid, k+1, nr_oid_total,
result_list);
/*
* If we get a 404 for an individual object, ignore
* it and get the rest. We'll fixup the 'ec' later.
*/
if (status->ec == GH__ERROR_CODE__HTTP_404) {
if (!err404.len)
strbuf_addf(&err404, "%s: from GET %s",
status->error_message.buf,
oid_to_hex(oid));
/*
* Mark the fetch as "incomplete", but don't
* stop trying to get other chunks.
*/
had_404 = 1;
continue;
}
if (status->ec != GH__ERROR_CODE__OK) {
/* Stop at the first hard error. */
strbuf_addf(&status->error_message, ": from GET %s",
oid_to_hex(oid));
goto cleanup;
}
}
cleanup:
if (had_404 && status->ec == GH__ERROR_CODE__OK) {
strbuf_setlen(&status->error_message, 0);
strbuf_addbuf(&status->error_message, &err404);
status->ec = GH__ERROR_CODE__HTTP_404;
}
strbuf_release(&err404);
}
/*
* Drive one or more HTTP POST requests to bulk fetch the objects in
* the given OIDSET. Create one or more packfiles and/or loose objects.
*
* Accumulate results for each request in `result_list` until we get a
* hard error and have to stop.
*/
static void do__http_post__fetch_oidset(struct gh__response_status *status,
struct oidset *oids,
unsigned long nr_oid_total,
struct string_list *result_list)
{
struct oidset_iter iter;
struct strbuf err404 = STRBUF_INIT;
unsigned long k;
unsigned long nr_oid_taken;
int j_pack_den = 0;
int j_pack_num = 0;
int had_404 = 0;
gh__response_status__zero(status);
if (!nr_oid_total)
return;
oidset_iter_init(oids, &iter);
j_pack_den = ((nr_oid_total + gh__cmd_opts.block_size - 1)
/ gh__cmd_opts.block_size);
for (k = 0; k < nr_oid_total; k += nr_oid_taken) {
j_pack_num++;
do__http_post__gvfs_objects(status, &iter,
gh__cmd_opts.block_size,
j_pack_num, j_pack_den,
result_list,
&nr_oid_taken);
/*
* Because the oidset iterator has random
* order, it does no good to say the k-th or
* n-th chunk was incomplete; the client
* cannot use that index for anything.
*
* We get a 404 when at least one object in
* the chunk was not found.
*
* For now, ignore the 404 and go on to the
* next chunk and then fixup the 'ec' later.
*/
if (status->ec == GH__ERROR_CODE__HTTP_404) {
if (!err404.len)
strbuf_addf(&err404,
"%s: from POST",
status->error_message.buf);
/*
* Mark the fetch as "incomplete", but don't
* stop trying to get other chunks.
*/
had_404 = 1;
continue;
}
if (status->ec != GH__ERROR_CODE__OK) {
/* Stop at the first hard error. */
strbuf_addstr(&status->error_message,
": from POST");
goto cleanup;
}
}
cleanup:
if (had_404 && status->ec == GH__ERROR_CODE__OK) {
strbuf_setlen(&status->error_message, 0);
strbuf_addbuf(&status->error_message, &err404);
status->ec = GH__ERROR_CODE__HTTP_404;
}
strbuf_release(&err404);
}
/*
* Finish with initialization. This happens after the main option
* parsing, dispatch to sub-command, and sub-command option parsing
* and before actually doing anything.
*
* Optionally configure the cache-server if the sub-command will
* use it.
*/
static void finish_init(int setup_cache_server)
{
select_odb();
lookup_main_url();
gh_http_init();
if (setup_cache_server)
select_cache_server();
}
/*
* Request gvfs/config from main Git server. (Config data is not
* available from a GVFS cache-server.)
*
* Print the received server configuration (as the raw JSON string).
*/
static enum gh__error_code do_sub_cmd__config(int argc, const char **argv)
{
struct gh__response_status status = GH__RESPONSE_STATUS_INIT;
struct strbuf config_data = STRBUF_INIT;
enum gh__error_code ec = GH__ERROR_CODE__OK;
trace2_cmd_mode("config");
finish_init(0);
do__http_get__gvfs_config(&status, &config_data);
ec = status.ec;
if (ec == GH__ERROR_CODE__OK)
printf("%s\n", config_data.buf);
else
error("config: %s", status.error_message.buf);
gh__response_status__release(&status);
strbuf_release(&config_data);
return ec;
}
static enum gh__error_code do_sub_cmd__endpoint(int argc, const char **argv)
{
struct gh__response_status status = GH__RESPONSE_STATUS_INIT;
struct strbuf data = STRBUF_INIT;
enum gh__error_code ec = GH__ERROR_CODE__OK;
const char *endpoint;
if (argc != 2)
return GH__ERROR_CODE__ERROR;
endpoint = argv[1];
trace2_cmd_mode(endpoint);
finish_init(0);
do__http_get__simple_endpoint(&status, &data, endpoint, endpoint);
ec = status.ec;
if (ec == GH__ERROR_CODE__OK)
printf("%s\n", data.buf);
else
error("config: %s", status.error_message.buf);
gh__response_status__release(&status);
strbuf_release(&data);
return ec;
}
/*
* Read a list of objects from stdin and fetch them as a series of
* single object HTTP GET requests.
*/
static enum gh__error_code do_sub_cmd__get(int argc, const char **argv)
{
static struct option get_options[] = {
OPT_INTEGER('r', "max-retries", &gh__cmd_opts.max_retries,
N_("retries for transient network errors")),
OPT_END(),
};
struct gh__response_status status = GH__RESPONSE_STATUS_INIT;
struct oidset oids = OIDSET_INIT;
struct string_list result_list = STRING_LIST_INIT_DUP;
enum gh__error_code ec = GH__ERROR_CODE__OK;
unsigned long nr_oid_total;
int k;
trace2_cmd_mode("get");
if (argc > 1 && !strcmp(argv[1], "-h"))
usage_with_options(objects_get_usage, get_options);
argc = parse_options(argc, argv, NULL, get_options, objects_get_usage, 0);
if (gh__cmd_opts.max_retries < 0)
gh__cmd_opts.max_retries = 0;
finish_init(1);
nr_oid_total = read_stdin_for_oids(&oids);
do__http_get__fetch_oidset(&status, &oids, nr_oid_total, &result_list);
ec = status.ec;
for (k = 0; k < result_list.nr; k++)
printf("%s\n", result_list.items[k].string);
if (ec != GH__ERROR_CODE__OK)
error("get: %s", status.error_message.buf);
gh__response_status__release(&status);
oidset_clear(&oids);
string_list_clear(&result_list, 0);
return ec;
}
/*
* Read a list of objects from stdin and fetch them in a single request (or
* multiple block-size requests) using one or more HTTP POST requests.
*/
static enum gh__error_code do_sub_cmd__post(int argc, const char **argv)
{
static struct option post_options[] = {
OPT_MAGNITUDE('b', "block-size", &gh__cmd_opts.block_size,
N_("number of objects to request at a time")),
OPT_INTEGER('d', "depth", &gh__cmd_opts.depth,
N_("Commit depth")),
OPT_INTEGER('r', "max-retries", &gh__cmd_opts.max_retries,
N_("retries for transient network errors")),
OPT_END(),
};
struct gh__response_status status = GH__RESPONSE_STATUS_INIT;
struct oidset oids = OIDSET_INIT;
struct string_list result_list = STRING_LIST_INIT_DUP;
enum gh__error_code ec = GH__ERROR_CODE__OK;
unsigned long nr_oid_total;
int k;
trace2_cmd_mode("post");
if (argc > 1 && !strcmp(argv[1], "-h"))
usage_with_options(objects_post_usage, post_options);
argc = parse_options(argc, argv, NULL, post_options, objects_post_usage, 0);
if (gh__cmd_opts.depth < 1)
gh__cmd_opts.depth = 1;
if (gh__cmd_opts.max_retries < 0)
gh__cmd_opts.max_retries = 0;
finish_init(1);
nr_oid_total = read_stdin_for_oids(&oids);
do__http_post__fetch_oidset(&status, &oids, nr_oid_total, &result_list);
ec = status.ec;
for (k = 0; k < result_list.nr; k++)
printf("%s\n", result_list.items[k].string);
if (ec != GH__ERROR_CODE__OK)
error("post: %s", status.error_message.buf);
gh__response_status__release(&status);
oidset_clear(&oids);
string_list_clear(&result_list, 0);
return ec;
}
/*
* Interpret the given string as a timestamp and compute an absolute
* UTC-seconds-since-epoch value (and without TZ).
*
* Note that the gvfs/prefetch API only accepts seconds since epoch,
* so that is all we really need here. But there is a tradition of
* various Git commands allowing a variety of formats for args like
* this. For example, see the `--date` arg in `git commit`. We allow
* these other forms mainly for testing purposes.
*/
static int my_parse_since(const char *since, timestamp_t *p_timestamp)
{
int offset = 0;
int errors = 0;
unsigned long t;
if (!parse_date_basic(since, p_timestamp, &offset))
return 0;
t = approxidate_careful(since, &errors);
if (!errors) {
*p_timestamp = t;
return 0;
}
return -1;
}
/*
* Ask the server for all available packfiles -or- all available since
* the given timestamp.
*/
static enum gh__error_code do_sub_cmd__prefetch(int argc, const char **argv)
{
static const char *since_str;
static struct option prefetch_options[] = {
OPT_STRING(0, "since", &since_str, N_("since"), N_("seconds since epoch")),
OPT_END(),
};
struct gh__response_status status = GH__RESPONSE_STATUS_INIT;
struct string_list result_list = STRING_LIST_INIT_DUP;
enum gh__error_code ec = GH__ERROR_CODE__OK;
timestamp_t seconds_since_epoch = 0;
int k;
trace2_cmd_mode("prefetch");
if (argc > 1 && !strcmp(argv[1], "-h"))
usage_with_options(prefetch_usage, prefetch_options);
argc = parse_options(argc, argv, NULL, prefetch_options, prefetch_usage, 0);
if (since_str && *since_str) {
if (my_parse_since(since_str, &seconds_since_epoch))
die("could not parse 'since' field");
}
finish_init(1);
do__http_get__gvfs_prefetch(&status, seconds_since_epoch, &result_list);
ec = status.ec;
for (k = 0; k < result_list.nr; k++)
printf("%s\n", result_list.items[k].string);
if (ec != GH__ERROR_CODE__OK)
error("prefetch: %s", status.error_message.buf);
gh__response_status__release(&status);
string_list_clear(&result_list, 0);
return ec;
}
/*
* Handle the 'objects.get' and 'objects.post' and 'objects.prefetch'
* verbs in "server mode".
*
* Only call error() and set ec for hard errors where we cannot
* communicate correctly with the foreground client process. Pass any
* actual data errors (such as 404's or 401's from the fetch) back to
* the client process.
*/
static enum gh__error_code do_server_subprocess__objects(const char *verb_line)
{
struct gh__response_status status = GH__RESPONSE_STATUS_INIT;
struct oidset oids = OIDSET_INIT;
struct object_id oid;
struct string_list result_list = STRING_LIST_INIT_DUP;
enum gh__error_code ec = GH__ERROR_CODE__OK;
char *line;
int len;
int err;
int k;
enum gh__objects_mode objects_mode;
unsigned long nr_oid_total = 0;
timestamp_t seconds_since_epoch = 0;
if (!strcmp(verb_line, "objects.get"))
objects_mode = GH__OBJECTS_MODE__GET;
else if (!strcmp(verb_line, "objects.post"))
objects_mode = GH__OBJECTS_MODE__POST;
else if (!strcmp(verb_line, "objects.prefetch"))
objects_mode = GH__OBJECTS_MODE__PREFETCH;
else {
error("server: unexpected objects-mode verb '%s'", verb_line);
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
switch (objects_mode) {
case GH__OBJECTS_MODE__GET:
case GH__OBJECTS_MODE__POST:
while (1) {
len = packet_read_line_gently(0, NULL, &line);
if (len < 0 || !line)
break;
if (get_oid_hex(line, &oid)) {
error("server: invalid oid syntax '%s'", line);
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
if (!oidset_insert(&oids, &oid))
nr_oid_total++;
}
if (!nr_oid_total) {
/* if zero objects requested, trivial OK. */
if (packet_write_fmt_gently(1, "ok\n")) {
error("server: cannot write 'get' result to client");
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
} else
ec = GH__ERROR_CODE__OK;
goto cleanup;
}
if (objects_mode == GH__OBJECTS_MODE__GET)
do__http_get__fetch_oidset(&status, &oids,
nr_oid_total, &result_list);
else
do__http_post__fetch_oidset(&status, &oids,
nr_oid_total, &result_list);
break;
case GH__OBJECTS_MODE__PREFETCH:
/* get optional timestamp line */
while (1) {
len = packet_read_line_gently(0, NULL, &line);
if (len < 0 || !line)
break;
seconds_since_epoch = strtoul(line, NULL, 10);
}
do__http_get__gvfs_prefetch(&status, seconds_since_epoch,
&result_list);
break;
default:
BUG("unexpected object_mode in switch '%d'", objects_mode);
}
/*
* Write pathname of the ODB where we wrote all of the objects
* we fetched.
*/
if (packet_write_fmt_gently(1, "odb %s\n",
gh__global.buf_odb_path.buf)) {
error("server: cannot write 'odb' to client");
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
for (k = 0; k < result_list.nr; k++)
if (packet_write_fmt_gently(1, "%s\n",
result_list.items[k].string))
{
error("server: cannot write result to client: '%s'",
result_list.items[k].string);
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
/*
* We only use status.ec to tell the client whether the request
* was complete, incomplete, or had IO errors. We DO NOT return
* this value to our caller.
*/
err = 0;
if (status.ec == GH__ERROR_CODE__OK)
err = packet_write_fmt_gently(1, "ok\n");
else if (status.ec == GH__ERROR_CODE__HTTP_404)
err = packet_write_fmt_gently(1, "partial\n");
else
err = packet_write_fmt_gently(1, "error %s\n",
status.error_message.buf);
if (err) {
error("server: cannot write result to client");
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
if (packet_flush_gently(1)) {
error("server: cannot flush result to client");
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
cleanup:
oidset_clear(&oids);
string_list_clear(&result_list, 0);
return ec;
}
typedef enum gh__error_code (fn_subprocess_cmd)(const char *verb_line);
struct subprocess_capability {
const char *name;
int client_has;
fn_subprocess_cmd *pfn;
};
static struct subprocess_capability caps[] = {
{ "objects", 0, do_server_subprocess__objects },
{ NULL, 0, NULL },
};
/*
* Handle the subprocess protocol handshake as described in:
* [] Documentation/technical/protocol-common.txt
* [] Documentation/technical/long-running-process-protocol.txt
*/
static int do_protocol_handshake(void)
{
#define OUR_SUBPROCESS_VERSION "1"
char *line;
int len;
int k;
int b_support_our_version = 0;
len = packet_read_line_gently(0, NULL, &line);
if (len < 0 || !line || strcmp(line, "gvfs-helper-client")) {
error("server: subprocess welcome handshake failed: %s", line);
return -1;
}
while (1) {
const char *v;
len = packet_read_line_gently(0, NULL, &line);
if (len < 0 || !line)
break;
if (!skip_prefix(line, "version=", &v)) {
error("server: subprocess version handshake failed: %s",
line);
return -1;
}
b_support_our_version |= (!strcmp(v, OUR_SUBPROCESS_VERSION));
}
if (!b_support_our_version) {
error("server: client does not support our version: %s",
OUR_SUBPROCESS_VERSION);
return -1;
}
if (packet_write_fmt_gently(1, "gvfs-helper-server\n") ||
packet_write_fmt_gently(1, "version=%s\n",
OUR_SUBPROCESS_VERSION) ||
packet_flush_gently(1)) {
error("server: cannot write version handshake");
return -1;
}
while (1) {
const char *v;
int k;
len = packet_read_line_gently(0, NULL, &line);
if (len < 0 || !line)
break;
if (!skip_prefix(line, "capability=", &v)) {
error("server: subprocess capability handshake failed: %s",
line);
return -1;
}
for (k = 0; caps[k].name; k++)
if (!strcmp(v, caps[k].name))
caps[k].client_has = 1;
}
for (k = 0; caps[k].name; k++)
if (caps[k].client_has)
if (packet_write_fmt_gently(1, "capability=%s\n",
caps[k].name)) {
error("server: cannot write capabilities handshake: %s",
caps[k].name);
return -1;
}
if (packet_flush_gently(1)) {
error("server: cannot write capabilities handshake");
return -1;
}
return 0;
}
/*
* Interactively listen to stdin for a series of commands and execute them.
*/
static enum gh__error_code do_sub_cmd__server(int argc, const char **argv)
{
static struct option server_options[] = {
OPT_MAGNITUDE('b', "block-size", &gh__cmd_opts.block_size,
N_("number of objects to request at a time")),
OPT_INTEGER('d', "depth", &gh__cmd_opts.depth,
N_("Commit depth")),
OPT_INTEGER('r', "max-retries", &gh__cmd_opts.max_retries,
N_("retries for transient network errors")),
OPT_END(),
};
enum gh__error_code ec = GH__ERROR_CODE__OK;
char *line;
int len;
int k;
trace2_cmd_mode("server");
if (argc > 1 && !strcmp(argv[1], "-h"))
usage_with_options(server_usage, server_options);
argc = parse_options(argc, argv, NULL, server_options, server_usage, 0);
if (gh__cmd_opts.depth < 1)
gh__cmd_opts.depth = 1;
if (gh__cmd_opts.max_retries < 0)
gh__cmd_opts.max_retries = 0;
finish_init(1);
if (do_protocol_handshake()) {
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
top_of_loop:
while (1) {
len = packet_read_line_gently(0, NULL, &line);
if (len < 0 || !line) {
/* use extra FLUSH as a QUIT */
ec = GH__ERROR_CODE__OK;
goto cleanup;
}
for (k = 0; caps[k].name; k++) {
if (caps[k].client_has &&
starts_with(line, caps[k].name)) {
ec = (caps[k].pfn)(line);
if (ec != GH__ERROR_CODE__OK)
goto cleanup;
goto top_of_loop;
}
}
error("server: unknown command '%s'", line);
ec = GH__ERROR_CODE__SUBPROCESS_SYNTAX;
goto cleanup;
}
cleanup:
return ec;
}
static enum gh__error_code do_sub_cmd(int argc, const char **argv)
{
if (!strcmp(argv[0], "get"))
return do_sub_cmd__get(argc, argv);
if (!strcmp(argv[0], "post"))
return do_sub_cmd__post(argc, argv);
if (!strcmp(argv[0], "config"))
return do_sub_cmd__config(argc, argv);
if (!strcmp(argv[0], "endpoint"))
return do_sub_cmd__endpoint(argc, argv);
if (!strcmp(argv[0], "prefetch"))
return do_sub_cmd__prefetch(argc, argv);
/*
* server mode is for talking with git.exe via the "gh_client_" API
* using packet-line format.
*/
if (!strcmp(argv[0], "server"))
return do_sub_cmd__server(argc, argv);
return GH__ERROR_CODE__USAGE;
}
/*
* Communicate with the primary Git server or a GVFS cache-server using the
* GVFS Protocol.
*
* https://github.com/microsoft/VFSForGit/blob/master/Protocol.md
*/
int cmd_main(int argc, const char **argv)
{
static struct option main_options[] = {
OPT_STRING('r', "remote", &gh__cmd_opts.remote_name,
N_("remote"),
N_("Remote name")),
OPT_BOOL('f', "fallback", &gh__cmd_opts.try_fallback,
N_("Fallback to Git server if cache-server fails")),
OPT_CALLBACK(0, "cache-server", NULL,
N_("cache-server"),
N_("cache-server=disable|trust|verify|error"),
option_parse_cache_server_mode),
OPT_CALLBACK(0, "shared-cache", NULL,
N_("pathname"),
N_("Pathname to shared objects directory"),
option_parse_shared_cache_directory),
OPT_BOOL('p', "progress", &gh__cmd_opts.show_progress,
N_("Show progress")),
OPT_END(),
};
enum gh__error_code ec = GH__ERROR_CODE__OK;
if (argc > 1 && !strcmp(argv[1], "-h"))
usage_with_options(main_usage, main_options);
trace2_cmd_name("gvfs-helper");
packet_trace_identity("gvfs-helper");
setup_git_directory_gently(NULL);
/* Set any non-zero initial values in gh__cmd_opts. */
gh__cmd_opts.depth = GH__DEFAULT__OBJECTS_POST__COMMIT_DEPTH;
gh__cmd_opts.block_size = GH__DEFAULT__OBJECTS_POST__BLOCK_SIZE;
gh__cmd_opts.max_retries = GH__DEFAULT_MAX_RETRIES;
gh__cmd_opts.max_transient_backoff_sec =
GH__DEFAULT_MAX_TRANSIENT_BACKOFF_SEC;
gh__cmd_opts.show_progress = !!isatty(2);
// TODO use existing gvfs config settings to override our GH__DEFAULT_
// TODO values in gh__cmd_opts. (And maybe add/remove our command line
// TODO options for them.)
// TODO
// TODO See "scalar.max-retries" (and maybe "gvfs.max-retries")
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, NULL, main_options, main_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (argc == 0)
usage_with_options(main_usage, main_options);
ec = do_sub_cmd(argc, argv);
gh_http_cleanup();
if (ec == GH__ERROR_CODE__USAGE)
usage_with_options(main_usage, main_options);
return ec;
}
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