70999e9cec (branch -m: update all per-worktree HEADs - 2016-03-27)
added this function in order to update HEADs of all relevant
worktrees, when a branch is renamed.

It, as a public ref api, kind of breaks abstraction when it uses
internal functions of files backend. With the introduction of
refs_create_symref(), we can move back pretty close to the code before
70999e9cec, where create_symref() was used for updating HEAD.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 branch.c             | 12 ++++++------
 refs.h               |  9 ---------
 refs/files-backend.c | 41 -----------------------------------------
 3 files changed, 6 insertions(+), 56 deletions(-)

diff --git a/branch.c b/branch.c
index fcb4a765c..ad0cc0489 100644
--- a/branch.c
+++ b/branch.c
@@ -352,18 +352,18 @@ int replace_each_worktree_head_symref(const char *oldref, 
const char *newref)
        int i;
 
        for (i = 0; worktrees[i]; i++) {
+               struct ref_store *refs;
+
                if (worktrees[i]->is_detached)
                        continue;
                if (worktrees[i]->head_ref &&
                    strcmp(oldref, worktrees[i]->head_ref))
                        continue;
 
-               if (set_worktree_head_symref(get_worktree_git_dir(worktrees[i]),
-                                            newref)) {
-                       ret = -1;
-                       error(_("HEAD of working tree %s is not updated"),
-                             worktrees[i]->path);
-               }
+               refs = get_worktree_ref_store(worktrees[i]);
+               if (refs_create_symref(refs, "HEAD", newref, NULL))
+                       ret = error(_("HEAD of working tree %s is not updated"),
+                                   worktrees[i]->path);
        }
 
        free_worktrees(worktrees);
diff --git a/refs.h b/refs.h
index 694769963..bce77891a 100644
--- a/refs.h
+++ b/refs.h
@@ -325,15 +325,6 @@ int rename_ref(const char *oldref, const char *newref, 
const char *logmsg);
 
 int create_symref(const char *refname, const char *target, const char *logmsg);
 
-/*
- * Update HEAD of the specified gitdir.
- * Similar to create_symref("relative-git-dir/HEAD", target, NULL), but
- * this can update the main working tree's HEAD regardless of where
- * $GIT_DIR points to.
- * Return 0 if successful, non-zero otherwise.
- * */
-int set_worktree_head_symref(const char *gitdir, const char *target);
-
 enum action_on_err {
        UPDATE_REFS_MSG_ON_ERR,
        UPDATE_REFS_DIE_ON_ERR,
diff --git a/refs/files-backend.c b/refs/files-backend.c
index f3be620ab..ba56e46d4 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -3108,47 +3108,6 @@ static int files_create_symref(struct ref_store 
*ref_store,
        return ret;
 }
 
-int set_worktree_head_symref(const char *gitdir, const char *target)
-{
-       /*
-        * FIXME: this obviously will not work well for future refs
-        * backends. This function needs to die.
-        */
-       struct files_ref_store *refs =
-               files_downcast(get_main_ref_store(), "set_head_symref");
-       static struct lock_file head_lock;
-       struct ref_lock *lock;
-       struct strbuf head_path = STRBUF_INIT;
-       const char *head_rel;
-       int ret;
-
-       strbuf_addf(&head_path, "%s/HEAD", absolute_path(gitdir));
-       if (hold_lock_file_for_update(&head_lock, head_path.buf,
-                                     LOCK_NO_DEREF) < 0) {
-               struct strbuf err = STRBUF_INIT;
-               unable_to_lock_message(head_path.buf, errno, &err);
-               error("%s", err.buf);
-               strbuf_release(&err);
-               strbuf_release(&head_path);
-               return -1;
-       }
-
-       /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for
-          linked trees */
-       head_rel = remove_leading_path(head_path.buf,
-                                      absolute_path(get_git_common_dir()));
-       /* to make use of create_symref_locked(), initialize ref_lock */
-       lock = xcalloc(1, sizeof(struct ref_lock));
-       lock->lk = &head_lock;
-       lock->ref_name = xstrdup(head_rel);
-
-       ret = create_symref_locked(refs, lock, head_rel, target, NULL);
-
-       unlock_ref(lock); /* will free lock */
-       strbuf_release(&head_path);
-       return ret;
-}
-
 static int files_reflog_exists(struct ref_store *ref_store,
                               const char *refname)
 {
-- 
2.11.0.157.gd943d85

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