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server-info.c: remove temporary info files on exit

Browse Source 
The update_info_file() function within server-info.c is responsible for
moving the info/refs and info/packs files around when updating server
info.

These updates are staged into a temporary file and then moved into place
atomically to avoid race conditions when reading those files. However,
the temporary file used to stage these changes is managed outside of the
tempfile.h API, and thus survives process death.

Manage these files instead with the tempfile.h API so that they are
automatically cleaned up upon abnormal process death.

Unfortunately, and unlike in the previous step, there isn't a
straightforward way to inject a failure into the update-server-info step
that causes us to die() rather than take the cleanup path in label
'out', hence the lack of a test here.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2024-06-06 18:19:31 -04:00 committed by Junio C Hamano
parent c195ecda77
commit 8981dca8bc
1 changed files with 10 additions and 16 deletions
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26
server-info.c
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@ -13,6 +13,7 @@
#include "object-store-ll.h"
#include "server-info.h"
#include "strbuf.h"
#include "tempfile.h"
struct update_info_ctx {
FILE *cur_fp;
@ -75,9 +76,8 @@ static int update_info_file(char *path,
int force)
{
char *tmp = mkpathdup("%s_XXXXXX", path);
struct tempfile *f = NULL;
int ret = -1;
int fd = -1;
FILE *to_close;
struct update_info_ctx uic = {
.cur_fp = NULL,
.old_fp = NULL,
@ -86,13 +86,12 @@ static int update_info_file(char *path,
};
safe_create_leading_directories(path);
fd = git_mkstemp_mode(tmp, 0666);
if (fd < 0)
f = mks_tempfile_m(tmp, 0666);
if (!f)
goto out;
to_close = uic.cur_fp = fdopen(fd, "w");
uic.cur_fp = fdopen_tempfile(f, "w");
if (!uic.cur_fp)
goto out;
fd = -1;
/* no problem on ENOENT and old_fp == NULL, it's stale, now */
if (!force)
@ -121,27 +120,22 @@ static int update_info_file(char *path,
}
uic.cur_fp = NULL;
if (fclose(to_close))
goto out;
if (uic_is_stale(&uic)) {
if (adjust_shared_perm(tmp) < 0)
if (adjust_shared_perm(get_tempfile_path(f)) < 0)
goto out;
if (rename(tmp, path) < 0)
if (rename_tempfile(&f, path) < 0)
goto out;
} else {
unlink(tmp);
delete_tempfile(&f);
}
ret = 0;
out:
if (ret) {
error_errno("unable to update %s", path);
if (uic.cur_fp)
fclose(uic.cur_fp);
else if (fd >= 0)
close(fd);
unlink(tmp);
if (f)
delete_tempfile(&f);
}
free(tmp);
if (uic.old_fp)