mirror of
https://github.com/git/git
synced 2024-11-05 18:59:29 +00:00
d58e8d34b0
In a working tree prepared in new-workdir (in contrib/), some files in .git/ directory are symbolic links to the original repository. The usual sequence of lock-write-rename would break the symbolic link. Ideally we should resolve relative symbolic link with maxdepth, but I do not want to risk too elaborate patch before 1.5.3 release, so this is a minimum and trivially obvious fix. new-workdir creates its symbolic links absolute, and does not link from a symlinked workdir, so this fix should suffice for now. Signed-off-by: Junio C Hamano <gitster@pobox.com>
112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
|
|
* Copyright (c) 2005, Junio C Hamano
|
|
*/
|
|
#include "cache.h"
|
|
|
|
static struct lock_file *lock_file_list;
|
|
static const char *alternate_index_output;
|
|
|
|
static void remove_lock_file(void)
|
|
{
|
|
pid_t me = getpid();
|
|
|
|
while (lock_file_list) {
|
|
if (lock_file_list->owner == me &&
|
|
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;
|
|
struct stat st;
|
|
|
|
if ((!lstat(path, &st)) && S_ISLNK(st.st_mode)) {
|
|
ssize_t sz;
|
|
static char target[PATH_MAX];
|
|
sz = readlink(path, target, sizeof(target));
|
|
if (sz < 0)
|
|
warning("Cannot readlink %s", path);
|
|
else if (target[0] != '/')
|
|
warning("Cannot lock target of relative symlink %s", path);
|
|
else
|
|
path = target;
|
|
}
|
|
sprintf(lk->filename, "%s.lock", path);
|
|
fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
|
|
if (0 <= fd) {
|
|
if (!lock_file_list) {
|
|
signal(SIGINT, remove_lock_file_on_signal);
|
|
atexit(remove_lock_file);
|
|
}
|
|
lk->owner = getpid();
|
|
if (!lk->on_list) {
|
|
lk->next = lock_file_list;
|
|
lock_file_list = lk;
|
|
lk->on_list = 1;
|
|
}
|
|
if (adjust_shared_perm(lk->filename))
|
|
return error("cannot fix permission bits on %s",
|
|
lk->filename);
|
|
}
|
|
else
|
|
lk->filename[0] = 0;
|
|
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.lock': %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;
|
|
}
|
|
|
|
int hold_locked_index(struct lock_file *lk, int die_on_error)
|
|
{
|
|
return hold_lock_file_for_update(lk, get_index_file(), die_on_error);
|
|
}
|
|
|
|
void set_alternate_index_output(const char *name)
|
|
{
|
|
alternate_index_output = name;
|
|
}
|
|
|
|
int commit_locked_index(struct lock_file *lk)
|
|
{
|
|
if (alternate_index_output) {
|
|
int result = rename(lk->filename, alternate_index_output);
|
|
lk->filename[0] = 0;
|
|
return result;
|
|
}
|
|
else
|
|
return commit_lock_file(lk);
|
|
}
|
|
|
|
void rollback_lock_file(struct lock_file *lk)
|
|
{
|
|
if (lk->filename[0])
|
|
unlink(lk->filename);
|
|
lk->filename[0] = 0;
|
|
}
|