Merge branch 'nd/lockfile-absolute'

The lockfile API can get confused which file to clean up when the
process moved the $cwd after creating a lockfile.

* nd/lockfile-absolute:
  lockfile.c: store absolute path

lockfile.c

@@ -128,9 +128,17 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
 		    path);
 	}
 
-	strbuf_add(&lk->filename, path, pathlen);
-	if (!(flags & LOCK_NO_DEREF))
-		resolve_symlink(&lk->filename);
+	if (flags & LOCK_NO_DEREF) {
+		strbuf_add_absolute_path(&lk->filename, path);
+	} else {
+		struct strbuf resolved_path = STRBUF_INIT;
+
+		strbuf_add(&resolved_path, path, pathlen);
+		resolve_symlink(&resolved_path);
+		strbuf_add_absolute_path(&lk->filename, resolved_path.buf);
+		strbuf_release(&resolved_path);
+	}
+
 	strbuf_addstr(&lk->filename, LOCK_SUFFIX);
 	lk->fd = open(lk->filename.buf, O_RDWR | O_CREAT | O_EXCL, 0666);
 	if (lk->fd < 0) {

t/t2107-update-index-basic.sh

@@ -65,4 +65,19 @@ test_expect_success '--cacheinfo mode,sha1,path (new syntax)' '
 	test_cmp expect actual
 '
 
+test_expect_success '.lock files cleaned up' '
+	mkdir cleanup &&
+	(
+	cd cleanup &&
+	mkdir worktree &&
+	git init repo &&
+	cd repo &&
+	git config core.worktree ../../worktree &&
+	# --refresh triggers late setup_work_tree,
+	# active_cache_changed is zero, rollback_lock_file fails
+	git update-index --refresh &&
+	! test -f .git/index.lock
+	)
+'
+
 test_done