diff options
Diffstat (limited to 'refs.c')
| -rw-r--r-- | refs.c | 29 |
1 files changed, 19 insertions, 10 deletions
@@ -390,6 +390,18 @@ int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *re return retval; } +/* + * If the "reading" argument is set, this function finds out what _object_ + * the ref points at by "reading" the ref. The ref, if it is not symbolic, + * has to exist, and if it is symbolic, it has to point at an existing ref, + * because the "read" goes through the symref to the ref it points at. + * + * The access that is not "reading" may often be "writing", but does not + * have to; it can be merely checking _where it leads to_. If it is a + * prelude to "writing" to the ref, a write to a symref that points at + * yet-to-be-born ref will create the real ref pointed by the symref. + * reading=0 allows the caller to check where such a symref leads to. + */ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) { int depth = MAXDEPTH; @@ -409,13 +421,7 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int * if (--depth < 0) return NULL; - /* Special case: non-existing file. - * Not having the refs/heads/new-branch is OK - * if we are writing into it, so is .git/HEAD - * that points at refs/heads/master still to be - * born. It is NOT OK if we are resolving for - * reading. - */ + /* Special case: non-existing file. */ if (lstat(path, &st) < 0) { struct ref_list *list = get_packed_refs(); while (list) { @@ -790,7 +796,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char struct ref_lock *lock; struct stat st; int last_errno = 0; - int type; + int type, lflags; int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); lock = xcalloc(1, sizeof(struct ref_lock)); @@ -830,8 +836,11 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char lock->lk = xcalloc(1, sizeof(struct lock_file)); - if (flags & REF_NODEREF) + lflags = LOCK_DIE_ON_ERROR; + if (flags & REF_NODEREF) { ref = orig_ref; + lflags |= LOCK_NODEREF; + } lock->ref_name = xstrdup(ref); lock->orig_ref_name = xstrdup(orig_ref); ref_file = git_path("%s", ref); @@ -845,8 +854,8 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char error("unable to create directory for %s", ref_file); goto error_return; } - lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); + lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; error_return: |