Re: [PATCH 6/7] test-lib: make --verbose output valid TAP

["SZEDER Gábor" <szeder.dev@gmail.com>]

On Tue, Mar 09, 2021 at 05:02:18PM +0100, Ævar Arnfjörð Bjarmason wrote:
> Make the --verbose output be valid TAP, making it machine-readable for
> TAP parsers again.
> 
> Both the verbose and non-verbose test outputs were valid TAP back when
> I added support for TAP in 5099b99d25f (test-lib: Adjust output to be
> valid TAP format, 2010-06-24).
> 
> Sometime after that the --verbose output broke due to some tests
> emitting their own lines starting "ok" (or otherwise invalidate the
> TAP). That was noticed and fixed in 452320f1f5 (test-lib: add
> --verbose-log option, 2016-10-21) and "fixed" by simply turning off
> the verbose mode when we were running under TAP::Harness (e.g. under
> "prove").
> 
> That solution worked for running under Travis CI. After that fix it
> was made to use the --verbose-log option in 041c72de109 (travis: use
> --verbose-log test option, 2016-10-21), see 522354d70f4 (Add Travis CI
> support, 2015-11-27) for the "cat t/test-results/*.out" code that was
> aimed at.
> 
> But that solution and others discussed in 452320f1f5 closed the door
> on us having reliable machine-readable TAP output.
> 
> Let's instead revert the work done in 452320f1f5 and, as well as the
> follow-up commits 88c6e9d31c (test-lib: --valgrind should not override
> --verbose-log, 2017-09-05) and f5ba2de6bc (test-lib: make "-x" work
> with "--verbose-log", 2017-12-08), which were only needed to work
> around bugs in the the previous --verbose-log implementation.
> 
> Replace it with a simple method for ensuring that we have valid TAP
> both on stdout, and in any verbose output we write. When we detect
> that we're running under "prove" we prefix all legitimate TAP
> directives with "GIT_TEST_TEE_STARTED":
> 
>     $ GIT_TEST_TEE_STARTED=1 ./t5547-push-quarantine.sh
>     GIT_TEST_TEE_STARTED ok 1 - create picky dest repo
>     GIT_TEST_TEE_STARTED ok 2 - accepted objects work
>     [...]
>     GIT_TEST_TEE_STARTED 1..6
> 
> Then, instead of piping the output to "tee -a" we pipe it to a helper
> which first converts "ok" and other TAP syntax to e.g. "\ok", and then
> strips that "GIT_TEST_TEE_STARTED " prefix from the start of the line.
> 
> The end result is that we're guaranteed to have valid TAP syntax on
> stdout.
> 
> We can thus get rid of the --verbose-log special-case. Since that
> option was meant to get around the TAP issue let's simply make it an
> alias for "--verbose --tee".
> 
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>

After applying this patch series there is still one place where we
look at $verbose_log:

  $ git grep -C4 verbose_log -- test-lib.sh
  test-lib.sh-
  test-lib.sh-exec 5>&1
  test-lib.sh-exec 6<&0
  test-lib.sh-exec 7>&2
  test-lib.sh:if test "$verbose_log" = "t"
  test-lib.sh-then
  test-lib.sh-    exec 3>>"$GIT_TEST_TEE_OUTPUT_FILE" 4>&3
  test-lib.sh-elif test "$verbose" = "t"
  test-lib.sh-then