Merge branch 'ky/branch-d-worktree' into maint

When "git worktree" feature is in use, "git branch -d" allowed
deletion of a branch that is checked out in another worktree

* ky/branch-d-worktree:
  branch -d: refuse deleting a branch which is currently checked out

1 files changed, 14 insertions, 8 deletions

diff --git a/builtin/branch.c b/builtin/branch.c
index 7b45b6b..8885d9f 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -20,6 +20,7 @@
 #include "utf8.h"
 #include "wt-status.h"
 #include "ref-filter.h"
+#include "worktree.h"
 
 static const char * const builtin_branch_usage[] = {
 	N_("git branch [<options>] [-r | -a] [--merged | --no-merged]"),
@@ -215,16 +216,21 @@ static int delete_branches(int argc, const char **argv, int force, int kinds,
 		int flags = 0;
 
 		strbuf_branchname(&bname, argv[i]);
-		if (kinds == FILTER_REFS_BRANCHES && !strcmp(head, bname.buf)) {
-			error(_("Cannot delete the branch '%s' "
-			      "which you are currently on."), bname.buf);
-			ret = 1;
-			continue;
-		}
-
 		free(name);
-
 		name = mkpathdup(fmt, bname.buf);
+
+		if (kinds == FILTER_REFS_BRANCHES) {
+			char *worktree = find_shared_symref("HEAD", name);
+			if (worktree) {
+				error(_("Cannot delete branch '%s' "
+					"checked out at '%s'"),
+				      bname.buf, worktree);
+				free(worktree);
+				ret = 1;
+				continue;
+			}
+		}
+
 		target = resolve_ref_unsafe(name,
 					    RESOLVE_REF_READING
 					    | RESOLVE_REF_NO_RECURSE