[PATCH 13/20] worktree.c: add update_worktree_gitfile()

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 worktree.c | 15 ++++++++++++++-
 worktree.h |  7 +++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/worktree.c b/worktree.c
index a11c053..d4513b1 100644
--- a/worktree.c
+++ b/worktree.c
@@ -237,13 +237,26 @@ int update_worktree_location(struct worktree *wt, const char *path_)
 			wt->path = strbuf_detach(&path, NULL);
 			ret = 0;
 		} else
-			ret = sys_error(_("failed to update '%s' for update"),
+			ret = sys_error(_("failed to update '%s'"),
 					git_common_path("worktrees/%s/gitdir", wt->id));
 	}
 	strbuf_release(&path);
 	return ret;
 }
 
+int update_worktree_gitfile(const char *gitfile,
+			    const char *repo_path,
+			    const char *id)
+{
+	if (!id)
+		return error(_("cannot update .git of main worktree"));
+
+	if (write_file_gently(gitfile, "gitdir: %s/worktrees/%s", real_path(repo_path), id))
+		return sys_error(_("failed to update '%s'"), gitfile);
+
+	return 0;
+}
+
 char *find_shared_symref(const char *symref, const char *target)
 {
 	char *existing = NULL;
diff --git a/worktree.h b/worktree.h
index 4c0395a..55f3449 100644
--- a/worktree.h
+++ b/worktree.h
@@ -45,6 +45,13 @@ extern int update_worktree_location(struct worktree *wt,
 				    const char *path_);
 
 /*
+ * Update .git file to point to the new repository's location.
+ */
+extern int update_worktree_gitfile(const char *gitfile,
+				   const char *repo_path,
+				   const char *id);
+
+/*
  * Free up the memory for worktree
  */
 extern void clear_worktree(struct worktree *);
-- 
2.7.0.377.g4cd97dd