Stefan Beller <sbeller@xxxxxxxxxx> writes:
> When using hard reset or forced checkout with the option to recurse into
> submodules, the submodules need to be reset, too.
>
> It turns out that we need to omit the duplicate old argument to read-tree
> in all forced cases to omit the 2 way merge and use the more assertive
> behavior of reading the specific new tree into the index and updating
> the working tree.
The phrase "the more assertive" made me imagine something like
"reset --hard", which resurrect lost paths and also get rid of added
paths. "reading the specific new tree into the index" smells more
like "checkout $tree-ish $paths" that has an overlay semantics, that
resurrects lost paths but does not get rid of added paths.
Perhaps not just "rm sub1/file1" but also add a new file that is not
in HEAD to ensure that it will be blown away when $command is run
to ensure that we got the distinction between the two right?
>
> Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
> ---
> submodule.c | 4 +++-
> t/lib-submodule-update.sh | 11 +++++++++++
> 2 files changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/submodule.c b/submodule.c
> index fa25888783..db0f7ac51e 100644
> --- a/submodule.c
> +++ b/submodule.c
> @@ -1653,7 +1653,9 @@ int submodule_move_head(const char *path,
> else
> argv_array_push(&cp.args, "-m");
>
> - argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX);
> + if (!(flags & SUBMODULE_MOVE_HEAD_FORCE))
> + argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX);
> +
> argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX);
>
> if (run_command(&cp)) {
> diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
> index fb0173ea87..380ef4b4ae 100755
> --- a/t/lib-submodule-update.sh
> +++ b/t/lib-submodule-update.sh
> @@ -1015,4 +1015,15 @@ test_submodule_forced_switch_recursing_with_args () {
> test_submodule_content sub1 origin/modify_sub1
> )
> '
> +
> + test_expect_success "$command: changed submodule worktree is reset" '
> + prolog &&
> + reset_work_tree_to_interested add_sub1 &&
> + (
> + cd submodule_update &&
> + rm sub1/file1 &&
> + $command HEAD &&
> + test_path_is_file sub1/file1
> + )
> + '
> }
