Re: [PATCH] maintenance tests: fix systemd v2.34.0-rc* test regression

> systemd-analyze is installed, but on which there's a discrepancy
> between a FILE argument of "/lib/systemd/system/basic.target" and
> "systemd/user/git-maintenance@.service" succeeding.
>
> There was an attempt to work around previous breakage in these tests
> in 670e5973992 (maintenance: fix test t7900-maintenance.sh,
> 2021-09-27), as noted in my [1] that commit is wrong about its
> assumption that we can use "/lib/systemd/system/basic.target" as a
> canary.argument.
>
> To fix this let's adjust this test to test what it really should be
> testing: If we've got systemd-analyze reporting anything useful, we
> should use it to check the syntax of our just-generated
> "systemd/user/git-maintenance@.service" file.
>
> Even on systems where this previously succeeded we weren't effectively
> doing that, because "systemd-analyze" will pass various syntax errors
> by and exit with a status code of 0, e.g. if the "[Unit]" section is
> replaced with a nonsensical "[HlaghUnfUnf]" section.
>
> To do that ignore whatever exit code we get from "systemd-analyze
> verify", and filter its stderr output to extract the sorts of lines it
> emits no note syntax warnings and errors. We need to filter out

> "Failed to load", which would be emitted e.g. on the
> gcc135.fsffrance.org test box[1].
>
> We also need to pipe this output to FD's 5 & 6, to avoid mixing up the
> trace output with our own output under "-x".
>
> 1. https://lore.kernel.org/git/211026.8635oo11jk.gmgdl@evledraar.gmail.com/
>
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>