Re: [PATCH 10/10] submodule deinit: complain when given a file instead of a submodule

> After this change, what is the simplest way to programmatically
> deinit any submodule that may exist, without failing if there are
> none?
>
> "git commit" by default refuses to make an empty commit, but
> it has the --allow-empty option.
>
> "git rm -r ." by default fails if there are no files in the repository,
> but it has the --ignore-unmatch option.
>
> It makes sense that "git submodule deinit ." should fail if there
> are no submodules, but please add support for --ignore-unmatch
> at the same time.

>
>     /ceder
>
>
> On Sat, Apr 30, 2016 at 2:40 AM, Stefan Beller <sbeller@google.com> wrote:
>> This also improves performance for listing submodules, because
>> S_ISGITLINK is both faster as match_pathspec as well as expected to
>> be true in fewer cases, so putting it first in the condition will speed
>> up the loop to compute all submodules.
>>
>> As this partially reverts 84ba959bbdf0 (submodule: fix regression for
>> deinit without submodules, 2016-03-22), this also disallows the use
>> of `git submodule deinit .` to deinit all submodules, when no
>> submodules are present. `deinit .` continues to work on repositories,
>> which have at least one submodule.
>>
>> CC: Per Cederqvist <cederp@opera.com>
>> Signed-off-by: Stefan Beller <sbeller@google.com>
>> ---
>>
>>
>>> Patch 10 is a controversial thing I'd assume as it breaks existing users.
>>> We should take it for the next major release (i.e. 3.0)
>>> I just want to put it out here now.
>>
>>  builtin/submodule--helper.c |  6 +++---
>>  t/t7400-submodule-basic.sh  | 15 ++++++++++++++-
>>  2 files changed, 17 insertions(+), 4 deletions(-)
>>
>> diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
>> index 7f0941d..e41de3e 100644
>> --- a/builtin/submodule--helper.c
>> +++ b/builtin/submodule--helper.c
>> @@ -242,9 +242,9 @@ static int module_list_compute(int argc, const char **argv,
>>         for (i = 0; i < active_nr; i++) {
>>                 const struct cache_entry *ce = active_cache[i];
>>
>> -               if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
>> -                                   0, ps_matched, 1) ||
>> -                   !S_ISGITLINK(ce->ce_mode))
>> +               if (!S_ISGITLINK(ce->ce_mode) ||
>> +                   !match_pathspec(pathspec, ce->name, ce_namelen(ce),
>> +                                   0, ps_matched, 1))
>>                         continue;
>>
>>                 ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
>> diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
>> index 53644da..361e6f6 100755
>> --- a/t/t7400-submodule-basic.sh
>> +++ b/t/t7400-submodule-basic.sh
>> @@ -915,7 +915,20 @@ test_expect_success 'submodule deinit works on repository without submodules' '
>>                 >file &&
>>                 git add file &&
>>                 git commit -m "repo should not be empty" &&
>> -               git submodule deinit .
>> +               git submodule deinit
>> +       )
>> +'
>> +
>> +test_expect_success 'submodule deinit refuses to deinit a file' '
>> +       test_when_finished "rm -rf newdirectory" &&
>> +       mkdir newdirectory &&
>> +       (
>> +               cd newdirectory &&
>> +               git init &&
>> +               >file &&
>> +               git add file &&
>> +               git commit -m "repo should not be empty" &&
>> +               test_must_fail git submodule deinit file
>>         )
>>  '
>>
>> --
>> 2.8.0.32.g71f8beb.dirty
>>