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Merge branch 'jc/maint-smart-http-race-upload-pack' into maint

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* jc/maint-smart-http-race-upload-pack:
  helping smart-http/stateless-rpc fetch race
This commit is contained in:
Junio C Hamano 2011-08-23 15:17:50 -07:00
commit 4a13c4d148
1 changed files with 98 additions and 9 deletions
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107
upload-pack.c
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@ -10,6 +10,7 @@
#include "revision.h"
#include "list-objects.h"
#include "run-command.h"
#include "sigchain.h"
static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
@ -498,11 +499,95 @@ static int get_common_commits(void)
}
}
static void check_non_tip(void)
{
static const char *argv[] = {
"rev-list", "--stdin", NULL,
};
static struct child_process cmd;
struct object *o;
char namebuf[42]; /* ^ + SHA-1 + LF */
int i;
/* In the normal in-process case non-tip request can never happen */
if (!stateless_rpc)
goto error;
cmd.argv = argv;
cmd.git_cmd = 1;
cmd.no_stderr = 1;
cmd.in = -1;
cmd.out = -1;
if (start_command(&cmd))
goto error;
/*
* If rev-list --stdin encounters an unknown commit, it
* terminates, which will cause SIGPIPE in the write loop
* below.
*/
sigchain_push(SIGPIPE, SIG_IGN);
namebuf[0] = '^';
namebuf[41] = '\n';
for (i = get_max_object_index(); 0 < i; ) {
o = get_indexed_object(--i);
if (!(o->flags & OUR_REF))
continue;
memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
if (write_in_full(cmd.in, namebuf, 42) < 0)
goto error;
}
namebuf[40] = '\n';
for (i = 0; i < want_obj.nr; i++) {
o = want_obj.objects[i].item;
if (o->flags & OUR_REF)
continue;
memcpy(namebuf, sha1_to_hex(o->sha1), 40);
if (write_in_full(cmd.in, namebuf, 41) < 0)
goto error;
}
close(cmd.in);
sigchain_pop(SIGPIPE);
/*
* The commits out of the rev-list are not ancestors of
* our ref.
*/
i = read_in_full(cmd.out, namebuf, 1);
if (i)
goto error;
close(cmd.out);
/*
* rev-list may have died by encountering a bad commit
* in the history, in which case we do want to bail out
* even when it showed no commit.
*/
if (finish_command(&cmd))
goto error;
/* All the non-tip ones are ancestors of what we advertised */
return;
error:
/* Pick one of them (we know there at least is one) */
for (i = 0; i < want_obj.nr; i++) {
o = want_obj.objects[i].item;
if (!(o->flags & OUR_REF))
die("git upload-pack: not our ref %s",
sha1_to_hex(o->sha1));
}
}
static void receive_needs(void)
{
struct object_array shallows = OBJECT_ARRAY_INIT;
static char line[1000];
int len, depth = 0;
int has_non_tip = 0;
shallow_nr = 0;
if (debug_fd)
@ -559,26 +644,30 @@ static void receive_needs(void)
if (strstr(line+45, "include-tag"))
use_include_tag = 1;
/* We have sent all our refs already, and the other end
* should have chosen out of them; otherwise they are
* asking for nonsense.
*
* Hmph. We may later want to allow "want" line that
* asks for something like "master~10" (symbolic)...
* would it make sense? I don't know.
*/
o = lookup_object(sha1_buf);
if (!o || !(o->flags & OUR_REF))
if (!o)
die("git upload-pack: not our ref %s",
sha1_to_hex(sha1_buf));
if (!(o->flags & WANTED)) {
o->flags |= WANTED;
if (!(o->flags & OUR_REF))
has_non_tip = 1;
add_object_array(o, NULL, &want_obj);
}
}
if (debug_fd)
write_str_in_full(debug_fd, "#E\n");
/*
* We have sent all our refs already, and the other end
* should have chosen out of them. When we are operating
* in the stateless RPC mode, however, their choice may
* have been based on the set of older refs advertised
* by another process that handled the initial request.
*/
if (has_non_tip)
check_non_tip();
if (!use_sideband && daemon_mode)
no_progress = 1;