[PATCH v2 19/26] worktree.c: add is_worktree_locked()

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

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 worktree.c | 18 ++++++++++++++++++
 worktree.h |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/worktree.c b/worktree.c
index 04aac73..facb907 100644
--- a/worktree.c
+++ b/worktree.c
@@ -219,6 +219,24 @@ int is_main_worktree(const struct worktree *wt)
 	return wt && !wt->id;
 }
 
+const char *is_worktree_locked(const struct worktree *wt)
+{
+	static struct strbuf sb = STRBUF_INIT;
+
+	if (!file_exists(git_common_path("worktrees/%s/locked", wt->id)))
+		return NULL;
+
+	strbuf_reset(&sb);
+	if (strbuf_read_file(&sb,
+			     git_common_path("worktrees/%s/locked", wt->id),
+			     0) < 0)
+		die_errno(_("failed to read '%s'"),
+			  git_common_path("worktrees/%s/locked", wt->id));
+
+	strbuf_rtrim(&sb);
+	return sb.buf;
+}
+
 static int report(int quiet, const char *fmt, ...)
 {
 	va_list params;
diff --git a/worktree.h b/worktree.h
index bbe40ef..cbd5389 100644
--- a/worktree.h
+++ b/worktree.h
@@ -39,6 +39,12 @@ extern struct worktree *find_worktree_by_path(struct worktree **list,
 extern int is_main_worktree(const struct worktree *wt);
 
 /*
+ * Return the reason string if the given worktree is locked. Return
+ * NULL otherwise.
+ */
+extern const char *is_worktree_locked(const struct worktree *wt);
+
+/*
  * Return zero if the worktree is in good condition.
  */
 extern int validate_worktree(const struct worktree *wt, int quiet);
-- 
2.7.0.377.g4cd97dd