On Mon, Aug 02 2021, David Bremner wrote:

> Tomi Ollila <tomi.ollila@iki.fi> writes:
>
>> -	mkdir -p "$test_results_dir"
>> +	test -d "$test_results_dir" || mkdir "$test_results_dir"
>
> Lately I've notice some complaints during parallel test running
>
> 	mkdir: cannot create directory '/home/bremner/software/upstream/notmuch/test/test-results': File exists
>
> It seems like this change might be the culprit. Can you explain why it
> was needed?

ah, parallel test non-atomicity is the problem; fix would be to restore -p to mkdir
(so it does not fail when another program executed mkdir between that test
check and mkdir execution)

i.e.

test -d "$test_results_dir" || mkdir -p "$test_results_dir"


Checking the dir with shell builtin drops need to execute mkdir in external
process, which makes the tests run a bit snappier (in small increments).


Tomi
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