@leroysheep / LeeRoySheep / commits / e3209bd4df

builtin/stash: fix `--keep-index --include-untracked` with empty HEAD

It was reported that creating a stash with `--keep-index --include-untracked` causes an error when HEAD points to a commit whose tree is empty: $ git stash push --keep-index --include-untracked error: pathspec ':/' did not match any file(s) known to git This error comes from `git checkout --no-overlay $i_tree -- :/`, which we execute to reset the working tree to the state in our index. As the tree generated from the index is empty in our case, ':/' does not match any files and thus causes git-checkout(1) to error out. Fix the issue by skipping the checkout when the index tree is empty. As explained in the in-code comment, this should be the correct thing to do as there is nothing that we'd have to reset in the first place. Reported-by: Piotr Siupa <piotrsiupa@gmail.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Patrick Steinhardt committed Aug 16, 2024 at 12:42 UTC e3209bd4df1f609fb2d730e52d3eea0633dbd786

2 files changed +37 -1

builtin/stash.c

+22 -1

index 3a4f9fd566..d2b701ef88 100644 --- a/builtin/stash.c +++ b/builtin/stash.c @@ -1647,7 +1647,28 @@ static int do_push_stash(const struct pathspec *ps, const char *stash_msg, int q } } - if (keep_index == 1 && !is_null_oid(&info.i_tree)) { + /* + * When keeping staged entries, we need to reset the working + * directory to match the state of our index. This can be + * skipped when the index is the empty tree, because there is + * nothing to reset in that case: + * + * - When the index has any file, regardless of whether + * staged or not, the tree cannot be empty by definition + * and thus we enter the condition. + * + * - When the index has no files, the only thing we need to + * care about is untracked files when `--include-untracked` + * is given. But as we already execute git-clean(1) further + * up to delete such untracked files we don't have to do + * anything here, either. + * + * We thus skip calling git-checkout(1) in this case, also + * because running it on an empty tree will cause it to fail + * due to the pathspec not matching anything. + */ + if (keep_index == 1 && !is_null_oid(&info.i_tree) && + !is_empty_tree_oid(&info.i_tree, the_repository->hash_algo)) { struct child_process cp = CHILD_PROCESS_INIT; cp.git_cmd = 1;

t/t3903-stash.sh

+15

index 376cc8f4ab..38906785e2 100755 --- a/t/t3903-stash.sh +++ b/t/t3903-stash.sh @@ -1384,6 +1384,21 @@ test_expect_success 'stash --keep-index with file deleted in index does not resu test_path_is_missing to-remove ' +test_expect_success 'stash --keep-index --include-untracked with empty tree' ' + test_when_finished "rm -rf empty" && + git init empty && + ( + cd empty && + git commit --allow-empty --message "empty" && + echo content >file && + git stash push --keep-index --include-untracked && + test_path_is_missing file && + git stash pop && + echo content >expect && + test_cmp expect file + ) +' + test_expect_success 'stash apply should succeed with unmodified file' ' echo base >file && git add file &&