mirror of
https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
Most of the callers except the one in refs.c use the function to update the index file. Among the index writers, everybody except write-tree dies if they cannot open it for writing. This gives the function an extra argument, to tell it to die when it cannot create a new file as the lockfile. The only caller that does not have to die is write-tree, because updating the index for the cache-tree part is optional and not being able to do so does not affect the correctness. I think we do not have to be so careful and make the failure into die() the same way as other callers, but that would be a different patch. Signed-off-by: Junio C Hamano <junkio@cox.net>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
|
|
* Copyright (c) 2005, Junio C Hamano
|
|
*/
|
|
#include <signal.h>
|
|
#include "cache.h"
|
|
|
|
static struct lock_file *lock_file_list;
|
|
|
|
static void remove_lock_file(void)
|
|
{
|
|
while (lock_file_list) {
|
|
if (lock_file_list->filename[0])
|
|
unlink(lock_file_list->filename);
|
|
lock_file_list = lock_file_list->next;
|
|
}
|
|
}
|
|
|
|
static void remove_lock_file_on_signal(int signo)
|
|
{
|
|
remove_lock_file();
|
|
signal(SIGINT, SIG_DFL);
|
|
raise(signo);
|
|
}
|
|
|
|
static int lock_file(struct lock_file *lk, const char *path)
|
|
{
|
|
int fd;
|
|
sprintf(lk->filename, "%s.lock", path);
|
|
fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
|
|
if (0 <= fd) {
|
|
if (!lk->next) {
|
|
lk->next = lock_file_list;
|
|
lock_file_list = lk;
|
|
signal(SIGINT, remove_lock_file_on_signal);
|
|
atexit(remove_lock_file);
|
|
}
|
|
if (adjust_shared_perm(lk->filename))
|
|
return error("cannot fix permission bits on %s",
|
|
lk->filename);
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
int hold_lock_file_for_update(struct lock_file *lk, const char *path, int die_on_error)
|
|
{
|
|
int fd = lock_file(lk, path);
|
|
if (fd < 0 && die_on_error)
|
|
die("unable to create '%s': %s", path, strerror(errno));
|
|
return fd;
|
|
}
|
|
|
|
int commit_lock_file(struct lock_file *lk)
|
|
{
|
|
char result_file[PATH_MAX];
|
|
int i;
|
|
strcpy(result_file, lk->filename);
|
|
i = strlen(result_file) - 5; /* .lock */
|
|
result_file[i] = 0;
|
|
i = rename(lk->filename, result_file);
|
|
lk->filename[0] = 0;
|
|
return i;
|
|
}
|
|
|
|
void rollback_lock_file(struct lock_file *lk)
|
|
{
|
|
if (lk->filename[0])
|
|
unlink(lk->filename);
|
|
lk->filename[0] = 0;
|
|
}
|
|
|