Kazuki Yamaguchi <k...@rhe.jp> writes:
> 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>
> ---
I suspect that this helper function should be in the common layer
(refs.c) to be redirected to specific backend(s).
David & Michael, what do you think?
> refs.h | 8 ++++++++
> refs/files-backend.c | 35 +++++++++++++++++++++++++++++++++++
> 2 files changed, 43 insertions(+)
>
> diff --git a/refs.h b/refs.h
> index 2f3decb432cf..f11154cf5faf 100644
> --- a/refs.h
> +++ b/refs.h
> @@ -306,6 +306,14 @@ 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
> is
> + * able to update the main working tree's HEAD wherever $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,
> diff --git a/refs/files-backend.c b/refs/files-backend.c
> index 81f68f846b69..ec237efec35d 100644
> --- a/refs/files-backend.c
> +++ b/refs/files-backend.c
> @@ -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;
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