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resolve_symlink(): take a strbuf parameter 

Change resolve_symlink() to take a strbuf rather than a string as
parameter.  This simplifies the code and removes an arbitrary pathname
length restriction.  It also means that lock_file's filename field no
longer needs to be initialized to a large size.

Helped-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2014-10-01 12:28:34 +02:00 committed by Junio C Hamano
parent 5025d8450a
commit 6cad805332
1 changed files with 22 additions and 35 deletions
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57
lockfile.c
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@ -109,58 +109,47 @@ static char *last_path_elm(char *p)
#define MAXDEPTH 5
/*
* p = path that may be a symlink
* s = full size of p
* path contains a path that might be a symlink.
*
* If p is a symlink, attempt to overwrite p with a path to the real
* file or directory (which may or may not exist), following a chain of
* symlinks if necessary. Otherwise, leave p unmodified.
* If path is a symlink, attempt to overwrite it with a path to the
* real file or directory (which may or may not exist), following a
* chain of symlinks if necessary. Otherwise, leave path unmodified.
*
* This is a best-effort routine. If an error occurs, p will either be
* left unmodified or will name a different symlink in a symlink chain
* that started with p's initial contents.
*
* Always returns p.
* This is a best-effort routine. If an error occurs, path will
* either be left unmodified or will name a different symlink in a
* symlink chain that started with the original path.
*/
static char *resolve_symlink(char *p, size_t s)
static void resolve_symlink(struct strbuf *path)
{
int depth = MAXDEPTH;
static struct strbuf link = STRBUF_INIT;
while (depth--) {
if (strbuf_readlink(&link, p, strlen(p)) < 0)
if (strbuf_readlink(&link, path->buf, path->len) < 0)
break;
if (is_absolute_path(link.buf)) {
if (is_absolute_path(link.buf))
/* absolute path simply replaces p */
if (link.len < s)
strcpy(p, link.buf);
else {
warning("%s: symlink too long", p);
break;
}
} else {
strbuf_reset(path);
else {
/*
* link is a relative path, so replace the
* last element of p with it.
*/
char *r = (char *)last_path_elm(p);
if (r - p + link.len < s)
strcpy(r, link.buf);
else {
warning("%s: symlink too long", p);
break;
}
char *r = last_path_elm(path->buf);
strbuf_setlen(path, r - path->buf);
}
strbuf_addbuf(path, &link);
}
strbuf_reset(&link);
return p;
}
/* Make sure errno contains a meaningful value on error */
static int lock_file(struct lock_file *lk, const char *path, int flags)
{
size_t pathlen = strlen(path);
if (!lock_file_list) {
/* One-time initialization */
sigchain_push_common(remove_lock_file_on_signal);
@ -175,7 +164,7 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
lk->fd = -1;
lk->active = 0;
lk->owner = 0;
strbuf_init(&lk->filename, PATH_MAX);
strbuf_init(&lk->filename, pathlen + LOCK_SUFFIX_LEN);
lk->next = lock_file_list;
lock_file_list = lk;
lk->on_list = 1;
@ -185,11 +174,9 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
path);
}
strbuf_addstr(&lk->filename, path);
if (!(flags & LOCK_NODEREF)) {
resolve_symlink(lk->filename.buf, lk->filename.alloc);
strbuf_setlen(&lk->filename, strlen(lk->filename.buf));
}
strbuf_add(&lk->filename, path, pathlen);
if (!(flags & LOCK_NODEREF))
resolve_symlink(&lk->filename);
strbuf_addstr(&lk->filename, LOCK_SUFFIX);
lk->fd = open(lk->filename.buf, O_RDWR | O_CREAT | O_EXCL, 0666);
if (lk->fd < 0) {