зеркало из https://github.com/microsoft/git.git
529 строки
12 KiB
C
529 строки
12 KiB
C
#include "cache.h"
|
|
#include "commit.h"
|
|
|
|
#include "fetch.h"
|
|
|
|
#include <curl/curl.h>
|
|
#include <curl/easy.h>
|
|
|
|
#if LIBCURL_VERSION_NUM < 0x070704
|
|
#define curl_global_cleanup() do { /* nothing */ } while(0)
|
|
#endif
|
|
#if LIBCURL_VERSION_NUM < 0x070800
|
|
#define curl_global_init(a) do { /* nothing */ } while(0)
|
|
#endif
|
|
|
|
static CURL *curl;
|
|
static struct curl_slist *no_pragma_header;
|
|
|
|
static char *initial_base;
|
|
|
|
struct alt_base
|
|
{
|
|
char *base;
|
|
int got_indices;
|
|
struct packed_git *packs;
|
|
struct alt_base *next;
|
|
};
|
|
|
|
struct alt_base *alt = NULL;
|
|
|
|
static SHA_CTX c;
|
|
static z_stream stream;
|
|
|
|
static int local;
|
|
static int zret;
|
|
|
|
static int curl_ssl_verify;
|
|
|
|
struct buffer
|
|
{
|
|
size_t posn;
|
|
size_t size;
|
|
void *buffer;
|
|
};
|
|
|
|
static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
|
|
struct buffer *buffer)
|
|
{
|
|
size_t size = eltsize * nmemb;
|
|
if (size > buffer->size - buffer->posn)
|
|
size = buffer->size - buffer->posn;
|
|
memcpy(buffer->buffer + buffer->posn, ptr, size);
|
|
buffer->posn += size;
|
|
return size;
|
|
}
|
|
|
|
static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
|
|
void *data)
|
|
{
|
|
unsigned char expn[4096];
|
|
size_t size = eltsize * nmemb;
|
|
int posn = 0;
|
|
do {
|
|
ssize_t retval = write(local, ptr + posn, size - posn);
|
|
if (retval < 0)
|
|
return posn;
|
|
posn += retval;
|
|
} while (posn < size);
|
|
|
|
stream.avail_in = size;
|
|
stream.next_in = ptr;
|
|
do {
|
|
stream.next_out = expn;
|
|
stream.avail_out = sizeof(expn);
|
|
zret = inflate(&stream, Z_SYNC_FLUSH);
|
|
SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
|
|
} while (stream.avail_in && zret == Z_OK);
|
|
return size;
|
|
}
|
|
|
|
void prefetch(unsigned char *sha1)
|
|
{
|
|
}
|
|
|
|
static int got_alternates = 0;
|
|
|
|
static int fetch_index(struct alt_base *repo, unsigned char *sha1)
|
|
{
|
|
char *filename;
|
|
char *url;
|
|
|
|
FILE *indexfile;
|
|
|
|
if (has_pack_index(sha1))
|
|
return 0;
|
|
|
|
if (get_verbosely)
|
|
fprintf(stderr, "Getting index for pack %s\n",
|
|
sha1_to_hex(sha1));
|
|
|
|
url = xmalloc(strlen(repo->base) + 64);
|
|
sprintf(url, "%s/objects/pack/pack-%s.idx",
|
|
repo->base, sha1_to_hex(sha1));
|
|
|
|
filename = sha1_pack_index_name(sha1);
|
|
indexfile = fopen(filename, "w");
|
|
if (!indexfile)
|
|
return error("Unable to open local file %s for pack index",
|
|
filename);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
|
|
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
|
|
curl_easy_setopt(curl, CURLOPT_URL, url);
|
|
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
|
|
|
|
if (curl_easy_perform(curl)) {
|
|
fclose(indexfile);
|
|
return error("Unable to get pack index %s", url);
|
|
}
|
|
|
|
fclose(indexfile);
|
|
return 0;
|
|
}
|
|
|
|
static int setup_index(struct alt_base *repo, unsigned char *sha1)
|
|
{
|
|
struct packed_git *new_pack;
|
|
if (has_pack_file(sha1))
|
|
return 0; // don't list this as something we can get
|
|
|
|
if (fetch_index(repo, sha1))
|
|
return -1;
|
|
|
|
new_pack = parse_pack_index(sha1);
|
|
new_pack->next = repo->packs;
|
|
repo->packs = new_pack;
|
|
return 0;
|
|
}
|
|
|
|
static int fetch_alternates(char *base)
|
|
{
|
|
int ret = 0;
|
|
struct buffer buffer;
|
|
char *url;
|
|
char *data;
|
|
int i = 0;
|
|
int http_specific = 1;
|
|
if (got_alternates)
|
|
return 0;
|
|
data = xmalloc(4096);
|
|
buffer.size = 4095;
|
|
buffer.posn = 0;
|
|
buffer.buffer = data;
|
|
|
|
if (get_verbosely)
|
|
fprintf(stderr, "Getting alternates list\n");
|
|
|
|
url = xmalloc(strlen(base) + 31);
|
|
sprintf(url, "%s/objects/info/http-alternates", base);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
|
|
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
|
|
curl_easy_setopt(curl, CURLOPT_URL, url);
|
|
|
|
if (curl_easy_perform(curl) || !buffer.posn) {
|
|
http_specific = 0;
|
|
|
|
sprintf(url, "%s/objects/info/alternates", base);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
|
|
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
|
|
curl_easy_setopt(curl, CURLOPT_URL, url);
|
|
|
|
if (curl_easy_perform(curl)) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
data[buffer.posn] = '\0';
|
|
|
|
while (i < buffer.posn) {
|
|
int posn = i;
|
|
while (posn < buffer.posn && data[posn] != '\n')
|
|
posn++;
|
|
if (data[posn] == '\n') {
|
|
int okay = 0;
|
|
int serverlen = 0;
|
|
struct alt_base *newalt;
|
|
char *target = NULL;
|
|
if (data[i] == '/') {
|
|
serverlen = strchr(base + 8, '/') - base;
|
|
okay = 1;
|
|
} else if (!memcmp(data + i, "../", 3)) {
|
|
i += 3;
|
|
serverlen = strlen(base);
|
|
while (i + 2 < posn &&
|
|
!memcmp(data + i, "../", 3)) {
|
|
do {
|
|
serverlen--;
|
|
} while (serverlen &&
|
|
base[serverlen - 1] != '/');
|
|
i += 3;
|
|
}
|
|
// If the server got removed, give up.
|
|
okay = strchr(base, ':') - base + 3 <
|
|
serverlen;
|
|
} else if (http_specific) {
|
|
char *colon = strchr(data + i, ':');
|
|
char *slash = strchr(data + i, '/');
|
|
if (colon && slash && colon < data + posn &&
|
|
slash < data + posn && colon < slash) {
|
|
okay = 1;
|
|
}
|
|
}
|
|
// skip 'objects' at end
|
|
if (okay) {
|
|
target = xmalloc(serverlen + posn - i - 6);
|
|
strncpy(target, base, serverlen);
|
|
strncpy(target + serverlen, data + i,
|
|
posn - i - 7);
|
|
target[serverlen + posn - i - 7] = '\0';
|
|
if (get_verbosely)
|
|
fprintf(stderr,
|
|
"Also look at %s\n", target);
|
|
newalt = xmalloc(sizeof(*newalt));
|
|
newalt->next = alt;
|
|
newalt->base = target;
|
|
newalt->got_indices = 0;
|
|
newalt->packs = NULL;
|
|
alt = newalt;
|
|
ret++;
|
|
}
|
|
}
|
|
i = posn + 1;
|
|
}
|
|
got_alternates = 1;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int fetch_indices(struct alt_base *repo)
|
|
{
|
|
unsigned char sha1[20];
|
|
char *url;
|
|
struct buffer buffer;
|
|
char *data;
|
|
int i = 0;
|
|
|
|
if (repo->got_indices)
|
|
return 0;
|
|
|
|
data = xmalloc(4096);
|
|
buffer.size = 4096;
|
|
buffer.posn = 0;
|
|
buffer.buffer = data;
|
|
|
|
if (get_verbosely)
|
|
fprintf(stderr, "Getting pack list\n");
|
|
|
|
url = xmalloc(strlen(repo->base) + 21);
|
|
sprintf(url, "%s/objects/info/packs", repo->base);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
|
|
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
|
|
curl_easy_setopt(curl, CURLOPT_URL, url);
|
|
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
|
|
|
|
if (curl_easy_perform(curl)) {
|
|
return -1;
|
|
}
|
|
|
|
while (i < buffer.posn) {
|
|
switch (data[i]) {
|
|
case 'P':
|
|
i++;
|
|
if (i + 52 < buffer.posn &&
|
|
!strncmp(data + i, " pack-", 6) &&
|
|
!strncmp(data + i + 46, ".pack\n", 6)) {
|
|
get_sha1_hex(data + i + 6, sha1);
|
|
setup_index(repo, sha1);
|
|
i += 51;
|
|
break;
|
|
}
|
|
default:
|
|
while (data[i] != '\n')
|
|
i++;
|
|
}
|
|
i++;
|
|
}
|
|
|
|
repo->got_indices = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
|
|
{
|
|
char *url;
|
|
struct packed_git *target;
|
|
struct packed_git **lst;
|
|
FILE *packfile;
|
|
char *filename;
|
|
|
|
if (fetch_indices(repo))
|
|
return -1;
|
|
target = find_sha1_pack(sha1, repo->packs);
|
|
if (!target)
|
|
return -1;
|
|
|
|
if (get_verbosely) {
|
|
fprintf(stderr, "Getting pack %s\n",
|
|
sha1_to_hex(target->sha1));
|
|
fprintf(stderr, " which contains %s\n",
|
|
sha1_to_hex(sha1));
|
|
}
|
|
|
|
url = xmalloc(strlen(repo->base) + 65);
|
|
sprintf(url, "%s/objects/pack/pack-%s.pack",
|
|
repo->base, sha1_to_hex(target->sha1));
|
|
|
|
filename = sha1_pack_name(target->sha1);
|
|
packfile = fopen(filename, "w");
|
|
if (!packfile)
|
|
return error("Unable to open local file %s for pack",
|
|
filename);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_FILE, packfile);
|
|
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
|
|
curl_easy_setopt(curl, CURLOPT_URL, url);
|
|
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
|
|
|
|
if (curl_easy_perform(curl)) {
|
|
fclose(packfile);
|
|
return error("Unable to get pack file %s", url);
|
|
}
|
|
|
|
fclose(packfile);
|
|
|
|
lst = &repo->packs;
|
|
while (*lst != target)
|
|
lst = &((*lst)->next);
|
|
*lst = (*lst)->next;
|
|
|
|
install_packed_git(target);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fetch_object(struct alt_base *repo, unsigned char *sha1)
|
|
{
|
|
char *hex = sha1_to_hex(sha1);
|
|
char *filename = sha1_file_name(sha1);
|
|
unsigned char real_sha1[20];
|
|
char tmpfile[PATH_MAX];
|
|
int ret;
|
|
char *url;
|
|
char *posn;
|
|
|
|
snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX",
|
|
get_object_directory());
|
|
|
|
local = mkstemp(tmpfile);
|
|
if (local < 0)
|
|
return error("Couldn't create temporary file %s for %s: %s\n",
|
|
tmpfile, filename, strerror(errno));
|
|
|
|
memset(&stream, 0, sizeof(stream));
|
|
|
|
inflateInit(&stream);
|
|
|
|
SHA1_Init(&c);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
|
|
curl_easy_setopt(curl, CURLOPT_FILE, NULL);
|
|
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
|
|
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
|
|
|
|
url = xmalloc(strlen(repo->base) + 50);
|
|
strcpy(url, repo->base);
|
|
posn = url + strlen(repo->base);
|
|
strcpy(posn, "objects/");
|
|
posn += 8;
|
|
memcpy(posn, hex, 2);
|
|
posn += 2;
|
|
*(posn++) = '/';
|
|
strcpy(posn, hex + 2);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_URL, url);
|
|
|
|
if (curl_easy_perform(curl)) {
|
|
unlink(filename);
|
|
return -1;
|
|
}
|
|
|
|
fchmod(local, 0444);
|
|
close(local);
|
|
inflateEnd(&stream);
|
|
SHA1_Final(real_sha1, &c);
|
|
if (zret != Z_STREAM_END) {
|
|
unlink(tmpfile);
|
|
return error("File %s (%s) corrupt\n", hex, url);
|
|
}
|
|
if (memcmp(sha1, real_sha1, 20)) {
|
|
unlink(tmpfile);
|
|
return error("File %s has bad hash\n", hex);
|
|
}
|
|
ret = link(tmpfile, filename);
|
|
if (ret < 0) {
|
|
/* Same Coda hack as in write_sha1_file(sha1_file.c) */
|
|
ret = errno;
|
|
if (ret == EXDEV && !rename(tmpfile, filename))
|
|
goto out;
|
|
}
|
|
unlink(tmpfile);
|
|
if (ret) {
|
|
if (ret != EEXIST)
|
|
return error("unable to write sha1 filename %s: %s",
|
|
filename, strerror(ret));
|
|
}
|
|
out:
|
|
pull_say("got %s\n", hex);
|
|
return 0;
|
|
}
|
|
|
|
int fetch(unsigned char *sha1)
|
|
{
|
|
struct alt_base *altbase = alt;
|
|
while (altbase) {
|
|
if (!fetch_object(altbase, sha1))
|
|
return 0;
|
|
if (!fetch_pack(altbase, sha1))
|
|
return 0;
|
|
if (fetch_alternates(altbase->base) > 0) {
|
|
altbase = alt;
|
|
continue;
|
|
}
|
|
altbase = altbase->next;
|
|
}
|
|
return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
|
|
initial_base);
|
|
}
|
|
|
|
int fetch_ref(char *ref, unsigned char *sha1)
|
|
{
|
|
char *url, *posn;
|
|
char hex[42];
|
|
struct buffer buffer;
|
|
char *base = initial_base;
|
|
buffer.size = 41;
|
|
buffer.posn = 0;
|
|
buffer.buffer = hex;
|
|
hex[41] = '\0';
|
|
|
|
curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
|
|
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
|
|
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
|
|
|
|
url = xmalloc(strlen(base) + 6 + strlen(ref));
|
|
strcpy(url, base);
|
|
posn = url + strlen(base);
|
|
strcpy(posn, "refs/");
|
|
posn += 5;
|
|
strcpy(posn, ref);
|
|
|
|
curl_easy_setopt(curl, CURLOPT_URL, url);
|
|
|
|
if (curl_easy_perform(curl))
|
|
return error("Couldn't get %s for %s\n", url, ref);
|
|
|
|
hex[40] = '\0';
|
|
get_sha1_hex(hex, sha1);
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
char *commit_id;
|
|
char *url;
|
|
int arg = 1;
|
|
|
|
while (arg < argc && argv[arg][0] == '-') {
|
|
if (argv[arg][1] == 't') {
|
|
get_tree = 1;
|
|
} else if (argv[arg][1] == 'c') {
|
|
get_history = 1;
|
|
} else if (argv[arg][1] == 'a') {
|
|
get_all = 1;
|
|
get_tree = 1;
|
|
get_history = 1;
|
|
} else if (argv[arg][1] == 'v') {
|
|
get_verbosely = 1;
|
|
} else if (argv[arg][1] == 'w') {
|
|
write_ref = argv[arg + 1];
|
|
arg++;
|
|
}
|
|
arg++;
|
|
}
|
|
if (argc < arg + 2) {
|
|
usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
|
|
return 1;
|
|
}
|
|
commit_id = argv[arg];
|
|
url = argv[arg + 1];
|
|
|
|
curl_global_init(CURL_GLOBAL_ALL);
|
|
|
|
curl = curl_easy_init();
|
|
no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
|
|
|
|
curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
|
|
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
|
|
#if LIBCURL_VERSION_NUM >= 0x070907
|
|
curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
|
|
#endif
|
|
|
|
alt = xmalloc(sizeof(*alt));
|
|
alt->base = url;
|
|
alt->got_indices = 0;
|
|
alt->packs = NULL;
|
|
alt->next = NULL;
|
|
initial_base = url;
|
|
|
|
if (pull(commit_id))
|
|
return 1;
|
|
|
|
curl_slist_free_all(no_pragma_header);
|
|
curl_global_cleanup();
|
|
return 0;
|
|
}
|