worktree.c: add is_worktree_locked()

We need this later to avoid double locking a worktree, or unlocking one
when it's not even locked.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/worktree.h b/worktree.h
index e1c4715238..90e1311fa7 100644
--- a/worktree.h
+++ b/worktree.h
@@ -5,10 +5,12 @@ struct worktree {
 	char *path;
 	char *id;
 	char *head_ref;
+	char *lock_reason;	/* internal use */
 	unsigned char head_sha1[20];
 	int is_detached;
 	int is_bare;
 	int is_current;
+	int lock_reason_valid;
 };
 
 /* Functions for acting on the information about worktrees. */
@@ -43,6 +45,12 @@ extern struct worktree *find_worktree(struct worktree **list,
 extern int is_main_worktree(const struct worktree *wt);
 
 /*
+ * Return the reason string if the given worktree is locked or NULL
+ * otherwise.
+ */
+extern const char *is_worktree_locked(struct worktree *wt);
+
+/*
  * Free up the memory for worktree(s)
  */
 extern void free_worktrees(struct worktree **);