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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
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@ -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,