зеркало из https://github.com/microsoft/git.git
git-remote-ext
This remote helper invokes external command and passes raw smart transport stream through it. This is useful for instance for invoking ssh with one-off odd options, connecting to git services in unix domain sockets, in abstract namespace, using TLS or other secure protocols, etc... Signed-off-by: Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ilari Liusvaara
Junio C Hamano
Родитель
3a9ed4bdee
Коммит
7f3ecebfcd
|
|
@ -113,6 +113,7 @@
|
|||
/git-remote-ftp
|
||||
/git-remote-ftps
|
||||
/git-remote-fd
|
||||
/git-remote-ext
|
||||
/git-remote-testgit
|
||||
/git-repack
|
||||
/git-replace
|
||||
|
|
|
|||
|
|
@ -0,0 +1,125 @@
|
|||
git-remote-ext(1)
|
||||
=================
|
||||
|
||||
NAME
|
||||
----
|
||||
git-remote-ext - Bridge smart transport to external command.
|
||||
|
||||
SYNOPSIS
|
||||
--------
|
||||
git remote add nick "ext::<command>[ <arguments>...]"
|
||||
|
||||
DESCRIPTION
|
||||
-----------
|
||||
This remote helper uses the specified 'program' to connect
|
||||
to a remote git server.
|
||||
|
||||
Data written to stdin of this specified 'program' is assumed
|
||||
to be sent to git:// server, git-upload-pack, git-receive-pack
|
||||
or git-upload-archive (depending on situation), and data read
|
||||
from stdout of this program is assumed to be received from
|
||||
the same service.
|
||||
|
||||
Command and arguments are separated by unescaped space.
|
||||
|
||||
The following sequences have a special meaning:
|
||||
|
||||
'% '::
|
||||
Literal space in command or argument.
|
||||
|
||||
'%%'::
|
||||
Literal percent sign.
|
||||
|
||||
'%s'::
|
||||
Replaced with name (receive-pack, upload-pack, or
|
||||
upload-archive) of the service git wants to invoke.
|
||||
|
||||
'%S'::
|
||||
Replaced with long name (git-receive-pack,
|
||||
git-upload-pack, or git-upload-archive) of the service
|
||||
git wants to invoke.
|
||||
|
||||
'%G<repository>' (as argument)::
|
||||
This argument will not be passed to 'program'. Instead, it
|
||||
will cause helper to start by sending git:// service request to
|
||||
remote side with service field set to approiate value and
|
||||
repository field set to <repository>. Default is not to send
|
||||
such request.
|
||||
+
|
||||
This is useful if remote side is git:// server accessed over
|
||||
some tunnel.
|
||||
|
||||
'%V<host>' (as argument)::
|
||||
This argument will not be passed to 'program'. Instead it sets
|
||||
the vhost field in git:// service request. Default is not to
|
||||
send vhost in such request (if sent).
|
||||
|
||||
ENVIRONMENT VARIABLES:
|
||||
----------------------
|
||||
|
||||
GIT_TRANSLOOP_DEBUG::
|
||||
If set, prints debugging information about various reads/writes.
|
||||
|
||||
ENVIRONMENT VARIABLES PASSED TO COMMAND:
|
||||
----------------------------------------
|
||||
|
||||
GIT_EXT_SERVICE::
|
||||
Set to long name (git-upload-pack, etc...) of service helper needs
|
||||
to invoke.
|
||||
|
||||
GIT_EXT_SERVICE_NOPREFIX::
|
||||
Set to long name (upload-pack, etc...) of service helper needs
|
||||
to invoke.
|
||||
|
||||
|
||||
EXAMPLES:
|
||||
---------
|
||||
This remote helper is transparently used by git when
|
||||
you use commands such as "git fetch <URL>", "git clone <URL>",
|
||||
, "git push <URL>" or "git remote add nick <URL>", where <URL>
|
||||
begins with `ext::`. Examples:
|
||||
|
||||
"ext::ssh -i /home/foo/.ssh/somekey user@host.example %S 'foo/repo'"::
|
||||
Like host.example:foo/repo, but use /home/foo/.ssh/somekey as
|
||||
keypair and user as user on remote side. This avoids needing to
|
||||
edit .ssh/config.
|
||||
|
||||
"ext::socat -t3600 - ABSTRACT-CONNECT:/git-server %G/somerepo"::
|
||||
Represents repository with path /somerepo accessable over
|
||||
git protocol at abstract namespace address /git-server.
|
||||
|
||||
"ext::git-server-alias foo %G/repo"::
|
||||
Represents a repository with path /repo accessed using the
|
||||
helper program "git-server-alias foo". The path to the
|
||||
repository and type of request are not passed on the command
|
||||
line but as part of the protocol stream, as usual with git://
|
||||
protocol.
|
||||
|
||||
"ext::git-server-alias foo %G/repo %Vfoo"::
|
||||
Represents a repository with path /repo accessed using the
|
||||
helper program "git-server-alias foo". The hostname for the
|
||||
remote server passed in the protocol stream will be "foo"
|
||||
(this allows multiple virtual git servers to share a
|
||||
link-level address).
|
||||
|
||||
"ext::git-server-alias foo %G/repo% with% spaces %Vfoo"::
|
||||
Represents a repository with path '/repo with spaces' accessed
|
||||
using the helper program "git-server-alias foo". The hostname for
|
||||
the remote server passed in the protocol stream will be "foo"
|
||||
(this allows multiple virtual git servers to share a
|
||||
link-level address).
|
||||
|
||||
"ext::git-ssl foo.example /bar"::
|
||||
Represents a repository accessed using the helper program
|
||||
"git-ssl foo.example /bar". The type of request can be
|
||||
determined by the helper using environment variables (see
|
||||
above).
|
||||
|
||||
Documentation
|
||||
--------------
|
||||
Documentation by Ilari Liusvaara, Jonathan Nieder and the git list
|
||||
<git@vger.kernel.org>
|
||||
|
||||
GIT
|
||||
---
|
||||
Part of the linkgit:git[1] suite
|
||||
1
Makefile
1
Makefile
|
|
@ -723,6 +723,7 @@ BUILTIN_OBJS += builtin/read-tree.o
|
|||
BUILTIN_OBJS += builtin/receive-pack.o
|
||||
BUILTIN_OBJS += builtin/reflog.o
|
||||
BUILTIN_OBJS += builtin/remote.o
|
||||
BUILTIN_OBJS += builtin/remote-ext.o
|
||||
BUILTIN_OBJS += builtin/remote-fd.o
|
||||
BUILTIN_OBJS += builtin/replace.o
|
||||
BUILTIN_OBJS += builtin/rerere.o
|
||||
|
|
|
|||
|
|
@ -107,6 +107,7 @@ extern int cmd_read_tree(int argc, const char **argv, const char *prefix);
|
|||
extern int cmd_receive_pack(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_reflog(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_remote(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_remote_ext(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_remote_fd(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_config(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_rerere(int argc, const char **argv, const char *prefix);
|
||||
|
|
|
|||
|
|
@ -0,0 +1,248 @@
|
|||
#include "git-compat-util.h"
|
||||
#include "transport.h"
|
||||
#include "run-command.h"
|
||||
|
||||
/*
|
||||
* URL syntax:
|
||||
* 'command [arg1 [arg2 [...]]]' Invoke command with given arguments.
|
||||
* Special characters:
|
||||
* '% ': Literal space in argument.
|
||||
* '%%': Literal percent sign.
|
||||
* '%S': Name of service (git-upload-pack/git-upload-archive/
|
||||
* git-receive-pack.
|
||||
* '%s': Same as \s, but with possible git- prefix stripped.
|
||||
* '%G': Only allowed as first 'character' of argument. Do not pass this
|
||||
* Argument to command, instead send this as name of repository
|
||||
* in in-line git://-style request (also activates sending this
|
||||
* style of request).
|
||||
* '%V': Only allowed as first 'character' of argument. Used in
|
||||
* conjunction with '%G': Do not pass this argument to command,
|
||||
* instead send this as vhost in git://-style request (note: does
|
||||
* not activate sending git:// style request).
|
||||
*/
|
||||
|
||||
static char *git_req;
|
||||
static char *git_req_vhost;
|
||||
|
||||
static char *strip_escapes(const char *str, const char *service,
|
||||
const char **next)
|
||||
{
|
||||
size_t rpos = 0;
|
||||
int escape = 0;
|
||||
char special = 0;
|
||||
size_t pslen = 0;
|
||||
size_t pSlen = 0;
|
||||
size_t psoff = 0;
|
||||
struct strbuf ret = STRBUF_INIT;
|
||||
|
||||
/* Calculate prefix length for \s and lengths for \s and \S */
|
||||
if (!strncmp(service, "git-", 4))
|
||||
psoff = 4;
|
||||
pSlen = strlen(service);
|
||||
pslen = pSlen - psoff;
|
||||
|
||||
/* Pass the service to command. */
|
||||
setenv("GIT_EXT_SERVICE", service, 1);
|
||||
setenv("GIT_EXT_SERVICE_NOPREFIX", service + psoff, 1);
|
||||
|
||||
/* Scan the length of argument. */
|
||||
while (str[rpos] && (escape || str[rpos] != ' ')) {
|
||||
if (escape) {
|
||||
switch (str[rpos]) {
|
||||
case ' ':
|
||||
case '%':
|
||||
case 's':
|
||||
case 'S':
|
||||
break;
|
||||
case 'G':
|
||||
case 'V':
|
||||
special = str[rpos];
|
||||
if (rpos == 1)
|
||||
break;
|
||||
/* Fall-through to error. */
|
||||
default:
|
||||
die("Bad remote-ext placeholder '%%%c'.",
|
||||
str[rpos]);
|
||||
}
|
||||
escape = 0;
|
||||
} else
|
||||
escape = (str[rpos] == '%');
|
||||
rpos++;
|
||||
}
|
||||
if (escape && !str[rpos])
|
||||
die("remote-ext command has incomplete placeholder");
|
||||
*next = str + rpos;
|
||||
if (**next == ' ')
|
||||
++*next; /* Skip over space */
|
||||
|
||||
/*
|
||||
* Do the actual placeholder substitution. The string will be short
|
||||
* enough not to overflow integers.
|
||||
*/
|
||||
rpos = special ? 2 : 0; /* Skip first 2 bytes in specials. */
|
||||
escape = 0;
|
||||
while (str[rpos] && (escape || str[rpos] != ' ')) {
|
||||
if (escape) {
|
||||
switch (str[rpos]) {
|
||||
case ' ':
|
||||
case '%':
|
||||
strbuf_addch(&ret, str[rpos]);
|
||||
break;
|
||||
case 's':
|
||||
strbuf_addstr(&ret, service + psoff);
|
||||
break;
|
||||
case 'S':
|
||||
strbuf_addstr(&ret, service);
|
||||
break;
|
||||
}
|
||||
escape = 0;
|
||||
} else
|
||||
switch (str[rpos]) {
|
||||
case '%':
|
||||
escape = 1;
|
||||
break;
|
||||
default:
|
||||
strbuf_addch(&ret, str[rpos]);
|
||||
break;
|
||||
}
|
||||
rpos++;
|
||||
}
|
||||
switch (special) {
|
||||
case 'G':
|
||||
git_req = strbuf_detach(&ret, NULL);
|
||||
return NULL;
|
||||
case 'V':
|
||||
git_req_vhost = strbuf_detach(&ret, NULL);
|
||||
return NULL;
|
||||
default:
|
||||
return strbuf_detach(&ret, NULL);
|
||||
}
|
||||
}
|
||||
|
||||
/* Should be enough... */
|
||||
#define MAXARGUMENTS 256
|
||||
|
||||
static const char **parse_argv(const char *arg, const char *service)
|
||||
{
|
||||
int arguments = 0;
|
||||
int i;
|
||||
const char **ret;
|
||||
char *temparray[MAXARGUMENTS + 1];
|
||||
|
||||
while (*arg) {
|
||||
char *expanded;
|
||||
if (arguments == MAXARGUMENTS)
|
||||
die("remote-ext command has too many arguments");
|
||||
expanded = strip_escapes(arg, service, &arg);
|
||||
if (expanded)
|
||||
temparray[arguments++] = expanded;
|
||||
}
|
||||
|
||||
ret = xmalloc((arguments + 1) * sizeof(char *));
|
||||
for (i = 0; i < arguments; i++)
|
||||
ret[i] = temparray[i];
|
||||
ret[arguments] = NULL;
|
||||
return (const char **)ret;
|
||||
}
|
||||
|
||||
static void send_git_request(int stdin_fd, const char *serv, const char *repo,
|
||||
const char *vhost)
|
||||
{
|
||||
size_t bufferspace;
|
||||
size_t wpos = 0;
|
||||
char *buffer;
|
||||
|
||||
/*
|
||||
* Request needs 12 bytes extra if there is vhost (xxxx \0host=\0) and
|
||||
* 6 bytes extra (xxxx \0) if there is no vhost.
|
||||
*/
|
||||
if (vhost)
|
||||
bufferspace = strlen(serv) + strlen(repo) + strlen(vhost) + 12;
|
||||
else
|
||||
bufferspace = strlen(serv) + strlen(repo) + 6;
|
||||
|
||||
if (bufferspace > 0xFFFF)
|
||||
die("Request too large to send");
|
||||
buffer = xmalloc(bufferspace);
|
||||
|
||||
/* Make the packet. */
|
||||
wpos = sprintf(buffer, "%04x%s %s%c", (unsigned)bufferspace,
|
||||
serv, repo, 0);
|
||||
|
||||
/* Add vhost if any. */
|
||||
if (vhost)
|
||||
sprintf(buffer + wpos, "host=%s%c", vhost, 0);
|
||||
|
||||
/* Send the request */
|
||||
if (write_in_full(stdin_fd, buffer, bufferspace) < 0)
|
||||
die_errno("Failed to send request");
|
||||
|
||||
free(buffer);
|
||||
}
|
||||
|
||||
static int run_child(const char *arg, const char *service)
|
||||
{
|
||||
int r;
|
||||
struct child_process child;
|
||||
|
||||
memset(&child, 0, sizeof(child));
|
||||
child.in = -1;
|
||||
child.out = -1;
|
||||
child.err = 0;
|
||||
child.argv = parse_argv(arg, service);
|
||||
|
||||
if (start_command(&child) < 0)
|
||||
die("Can't run specified command");
|
||||
|
||||
if (git_req)
|
||||
send_git_request(child.in, service, git_req, git_req_vhost);
|
||||
|
||||
r = bidirectional_transfer_loop(child.out, child.in);
|
||||
if (!r)
|
||||
r = finish_command(&child);
|
||||
else
|
||||
finish_command(&child);
|
||||
return r;
|
||||
}
|
||||
|
||||
#define MAXCOMMAND 4096
|
||||
|
||||
static int command_loop(const char *child)
|
||||
{
|
||||
char buffer[MAXCOMMAND];
|
||||
|
||||
while (1) {
|
||||
size_t length;
|
||||
if (!fgets(buffer, MAXCOMMAND - 1, stdin)) {
|
||||
if (ferror(stdin))
|
||||
die("Comammand input error");
|
||||
exit(0);
|
||||
}
|
||||
/* Strip end of line characters. */
|
||||
length = strlen(buffer);
|
||||
while (isspace((unsigned char)buffer[length - 1]))
|
||||
buffer[--length] = 0;
|
||||
|
||||
if (!strcmp(buffer, "capabilities")) {
|
||||
printf("*connect\n\n");
|
||||
fflush(stdout);
|
||||
} else if (!strncmp(buffer, "connect ", 8)) {
|
||||
printf("\n");
|
||||
fflush(stdout);
|
||||
return run_child(child, buffer + 8);
|
||||
} else {
|
||||
fprintf(stderr, "Bad command");
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int cmd_remote_ext(int argc, const char **argv, const char *prefix)
|
||||
{
|
||||
if (argc < 3) {
|
||||
fprintf(stderr, "Error: URL missing");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
return command_loop(argv[2]);
|
||||
}
|
||||
1
git.c
1
git.c
|
|
@ -374,6 +374,7 @@ static void handle_internal_command(int argc, const char **argv)
|
|||
{ "receive-pack", cmd_receive_pack },
|
||||
{ "reflog", cmd_reflog, RUN_SETUP },
|
||||
{ "remote", cmd_remote, RUN_SETUP },
|
||||
{ "remote-ext", cmd_remote_ext },
|
||||
{ "remote-fd", cmd_remote_fd },
|
||||
{ "replace", cmd_replace, RUN_SETUP },
|
||||
{ "repo-config", cmd_config, RUN_SETUP_GENTLY },
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче