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refs: add a new function set_worktree_head_symref

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Add a new function set_worktree_head_symref, to update HEAD symref for
the specified worktree.

To update HEAD of a linked working tree,
create_symref("worktrees/$work_tree/HEAD", "refs/heads/$branch", msg)
could be used. However when it comes to updating HEAD of the main
working tree, it is unusable because it uses $GIT_DIR for
worktree-specific symrefs (HEAD).

The new function takes git_dir (real directory) as an argument, and
updates HEAD of the working tree. This function will be used when
renaming a branch.

Signed-off-by: Kazuki Yamaguchi <k@rhe.jp>
Acked-by: David Turner <dturner@twopensource.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Kazuki Yamaguchi 2016-03-27 23:37:13 +09:00 committed by Junio C Hamano
parent 56331f8727
commit 2233066e77
2 changed files with 44 additions and 0 deletions
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9
refs.h
View file

@ -306,6 +306,15 @@ extern int rename_ref(const char *oldref, const char *newref, const char *logmsg
extern 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.
* */
extern 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,

35
refs/files-backend.c
View file

@ -2894,6 +2894,41 @@ int create_symref(const char *refname, const char *target, const char *logmsg)
return ret;
}
int set_worktree_head_symref(const char *gitdir, const char *target)
{
static struct lock_file head_lock;
struct ref_lock *lock;
struct strbuf err = STRBUF_INIT;
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) {
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);
lock->orig_ref_name = xstrdup(head_rel);
ret = create_symref_locked(lock, head_rel, target, NULL);
unlock_ref(lock); /* will free lock */
strbuf_release(&head_path);
return ret;
}
int reflog_exists(const char *refname)
{
struct stat st;