RE: [Test] t1901 - sparse checkout file when lock is taken fails (subtest 19)

["Randall S. Becker" <rsbecker@nexbridge.com>]

> From: Randall S. Becker <rsbecker@nexbridge.com>
On March 5, 2020 10:45 AM, I wrote:
> This one has me confused. It fails 100% of the time on NonStop. The test
> looks reasonable, as do the messages. I am not certain that test_i18ngrep
> works properly - it falls down to the return 1 statement which causes the
test
> to fail. The error message generated is "File already exists" not "File
exists"
> as is required in the test. We should not be testing for specific text
content
> originating from strerror - I thought we had this decision in a different
> thread. https://public-inbox.org/git/xmqq36intlpj.fsf@gitster-
> ct.c.googlers.com/
> 
> Thoughts?
> 
> expecting success of 1091.19 'fail when lock is taken':
>         test_when_finished rm -rf repo/.git/info/sparse-checkout.lock &&
>         touch repo/.git/info/sparse-checkout.lock &&
>         test_must_fail git -C repo sparse-checkout set deep 2>err &&
>         test_i18ngrep "File exists" err
> 
> error: 'grep File exists err' didn't find a match in:
> fatal: Unable to create '/home/ituglib/randall/git/t/trash
directory.t1091-
> sparse-checkout-builtin/repo/.git/info/sparse-checkout.lock': File already
> exists.   <----- this is the test issue
> 
> Another git process seems to be running in this repository, e.g.
> an editor opened by 'git commit'. Please make sure all processes are
> terminated then try again. If it still fails, a git process may have
crashed in
> this repository earlier:
> remove the file manually to continue.
> not ok 19 - fail when lock is taken
> #
> #               test_when_finished rm -rf
repo/.git/info/sparse-checkout.lock &&
> #               touch repo/.git/info/sparse-checkout.lock &&
> #               test_must_fail git -C repo sparse-checkout set deep 2>err
&&
> #               test_i18ngrep "File exists" err
> #

This situation still occurs at 2.26.0-rc0. As above, this results from a
text compare to a platform-specific message that should not be used. To hack
around it, a possible fix (which I don't like) could be as follows:

index b4c9c32a03..d1fd225dad 100755
--- a/t/t1091-sparse-checkout-builtin.sh
+++ b/t/t1091-sparse-checkout-builtin.sh
@@ -305,7 +305,7 @@ test_expect_success 'fail when lock is taken' '
        test_when_finished rm -rf repo/.git/info/sparse-checkout.lock &&
        touch repo/.git/info/sparse-checkout.lock &&
        test_must_fail git -C repo sparse-checkout set deep 2>err &&
-       test_i18ngrep "File exists" err
+       test_i18ngrep "File \(already \)*exists" err
 '

This does not remove the problem of platform error compares, but does allow
the test to temporarily pass.

Randall