This reduces the amount of string editing gyrations and makes it
unnecessary for callers to know how to derive the filename from the
lock_filename.
Signed-off-by: Michael Haggerty
---
cache.h| 1 +
lockfile.c | 57 -
refs.c | 10 ++
3 files changed, 35 insertions(+), 33 deletions(-)
diff --git a/cache.h b/cache.h
index 3d0a835..0fefc66 100644
--- a/cache.h
+++ b/cache.h
@@ -538,6 +538,7 @@ struct lock_file {
int fd;
pid_t owner;
unsigned char flags;
+ struct strbuf filename;
struct strbuf lock_filename;
};
#define LOCK_DIE_ON_ERROR 1
diff --git a/lockfile.c b/lockfile.c
index 87b40c4..07b5c21 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -35,24 +35,26 @@
*
* - Uninitialized. In this state the object's flags field must be
* zero but the rest of the contents need not be initialized. In
- * particular, the lock_filename strbuf should *not* be initialized
- * externally. The first time the object is used in any way, it is
- * initialized, permanently registered in the lock_file_list, and
- * flags & LOCK_FLAGS_ON_LIST is set.
+ * particular, the filename and lock_filename strbufs should *not*
+ * be initialized externally. The first time the object is used in
+ * any way, it is initialized, permanently registered in the
+ * lock_file_list, and flags & LOCK_FLAGS_ON_LIST is set.
*
* - Locked, lockfile open (after hold_lock_file_for_update() or
* hold_lock_file_for_append()). In this state, the lockfile
- * exists, lock_filename holds the filename of the lockfile, fd
- * holds a file descriptor open for writing to the lockfile, and
- * owner holds the PID of the process that locked the file.
+ * exists, filename holds the filename of the locked file,
+ * lock_filename holds the filename of the lockfile, fd holds a file
+ * descriptor open for writing to the lockfile, and owner holds the
+ * PID of the process that locked the file.
*
* - Locked, lockfile closed (after close_lock_file()). Same as the
* previous state, except that the lockfile is closed and fd is -1.
*
* - Unlocked (after commit_lock_file(), rollback_lock_file(), or a
- * failed attempt to lock). In this state, lock_filename is the
- * empty string and fd is -1. The object is left registered in the
- * lock_file_list, and flags & LOCK_FLAGS_ON_LIST is set.
+ * failed attempt to lock). In this state, filename and
+ * lock_filename are the empty string and fd is -1. The object is
+ * left registered in the lock_file_list, and flags &
+ * LOCK_FLAGS_ON_LIST is set.
*
* See Documentation/api-lockfile.txt for more information.
*/
@@ -164,25 +166,30 @@ static int lock_file(struct lock_file *lk, const char
*path, int flags)
lk->owner = getpid();
if (lk->flags & LOCK_FLAGS_ON_LIST) {
- assert(!lk->lock_filename.len); /* object not already in use */
- if (strbuf_avail(&lk->lock_filename) < path_len +
LOCK_SUFFIX_LEN)
- strbuf_grow(&lk->lock_filename, path_len +
LOCK_SUFFIX_LEN);
+ /* Sanity check that object is not already in use: */
+ assert(!lk->filename.len);
+ assert(!lk->lock_filename.len);
} else {
/* Initialize *lk and add it to lock_file_list: */
lk->fd = -1;
lk->flags |= LOCK_FLAGS_ON_LIST;
- strbuf_init(&lk->lock_filename, path_len + LOCK_SUFFIX_LEN);
+ strbuf_init(&lk->filename, path_len);
+ strbuf_init(&lk->lock_filename, 0);
lk->next = lock_file_list;
lock_file_list = lk;
}
- strbuf_add(&lk->lock_filename, path, path_len);
+ strbuf_add(&lk->filename, path, path_len);
if (!(flags & LOCK_NODEREF))
- resolve_symlink(&lk->lock_filename);
+ resolve_symlink(&lk->filename);
+
+ strbuf_grow(&lk->lock_filename, lk->filename.len + LOCK_SUFFIX_LEN);
+ strbuf_addbuf(&lk->lock_filename, &lk->filename);
strbuf_addstr(&lk->lock_filename, ".lock");
lk->fd = open(lk->lock_filename.buf, O_RDWR | O_CREAT | O_EXCL, 0666);
if (lk->fd < 0) {
+ strbuf_setlen(&lk->filename, 0);
strbuf_setlen(&lk->lock_filename, 0);
return -1;
}
@@ -269,18 +276,16 @@ int close_lock_file(struct lock_file *lk)
int commit_lock_file(struct lock_file *lk)
{
- char *result_file;
- size_t path_len = lk->lock_filename.len - LOCK_SUFFIX_LEN;
int err = 0;
if (lk->fd >= 0 && close_lock_file(lk))
return -1;
- result_file = xmemdupz(lk->lock_filename.buf, path_len);
- if (rename(lk->lock_filename.buf, result_file))
+ if (rename(lk->lock_filename.buf, lk->filename.buf)) {
err = -1;
- else
+ } else {
+ strbu
