Re: [ANNOUNCE] Git v2.23.0-rc0 - Initial test failures on NonStop

[Matheus Tavares Bernardino <matheus.bernardino@usp.br>]

Hi, Junio and Randall

On Tue, Jul 30, 2019 at 2:31 PM Junio C Hamano <gitster@pobox.com> wrote:
>
> "Randall S. Becker" <rsbecker@nexbridge.com> writes:
>
> > t0066: dir-iterator
> >
> > Subtest 4 depends on a non-portable error code. ENOENT is not guaranteed ...
> > Subtest 5 also depends on a non-portable error code. ENOTDIR is not gua...
>
> Yikes, and sorry.  I've become somewhat complacent after relying on
> how good our other reviewers are, pretty much ignored the new code
> in fringes like t/helper/, and failed catch an obvious amateurish
> mistake like this one.
>
> I do not think of a portable way to map an int ENOENT to a string
> "ENOENT", but there are only only two errors test-dir-iterator test
> code cares about, so perhaps a patch like the following may be
> sufficient.

Sorry for that. I totally overlooked the non-portability of error
codes when making the patch. But the proposed fix seems very good. And
having the literal string at the test instead of a number is much more
significant, as well.

> I wonder if a tool like sparse can help us catch a pattern that
> feeds errno to "%d" format.
>
>  t/helper/test-dir-iterator.c | 11 ++++++++++-
>  t/t0066-dir-iterator.sh      |  4 ++--
>  2 files changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/t/helper/test-dir-iterator.c b/t/helper/test-dir-iterator.c
> index a5b96cb0dc..c7c30664da 100644
> --- a/t/helper/test-dir-iterator.c
> +++ b/t/helper/test-dir-iterator.c
> @@ -4,6 +4,15 @@
>  #include "iterator.h"
>  #include "dir-iterator.h"
>
> +static const char *error_name(int error_number)
> +{
> +       switch (error_number) {
> +       case ENOENT: return "ENOENT";
> +       case ENOTDIR: return "ENOTDIR";
> +       default: return "ESOMETHINGELSE";
> +       }
> +}
> +
>  /*
>   * usage:
>   * tool-test dir-iterator [--follow-symlinks] [--pedantic] directory_path
> @@ -31,7 +40,7 @@ int cmd__dir_iterator(int argc, const char **argv)
>         diter = dir_iterator_begin(path.buf, flags);
>
>         if (!diter) {
> -               printf("dir_iterator_begin failure: %d\n", errno);
> +               printf("dir_iterator_begin failure: %s\n", error_name(errno));
>                 exit(EXIT_FAILURE);
>         }
>
> diff --git a/t/t0066-dir-iterator.sh b/t/t0066-dir-iterator.sh
> index 9354d3f1ed..92910e4e6c 100755
> --- a/t/t0066-dir-iterator.sh
> +++ b/t/t0066-dir-iterator.sh
> @@ -55,13 +55,13 @@ test_expect_success 'dir-iterator should list files in the correct order' '
>  test_expect_success 'begin should fail upon inexistent paths' '
>         test_must_fail test-tool dir-iterator ./inexistent-path \
>                 >actual-inexistent-path-output &&
> -       echo "dir_iterator_begin failure: 2" >expected-inexistent-path-output &&
> +       echo "dir_iterator_begin failure: ENOENT" >expected-inexistent-path-output &&
>         test_cmp expected-inexistent-path-output actual-inexistent-path-output
>  '
>
>  test_expect_success 'begin should fail upon non directory paths' '
>         test_must_fail test-tool dir-iterator ./dir/b >actual-non-dir-output &&
> -       echo "dir_iterator_begin failure: 20" >expected-non-dir-output &&
> +       echo "dir_iterator_begin failure: ENOTDIR" >expected-non-dir-output &&
>         test_cmp expected-non-dir-output actual-non-dir-output
>  '
>