Re* [PATCH v8 2/2] tests: add a test mode for SANITIZE=leak, run it in CI

[Junio C Hamano <gitster@pobox.com>]

Ævar Arnfjörð Bjarmason  <avarab@gmail.com> writes:

> The CI target uses a new GIT_TEST_PASSING_SANITIZE_LEAK=true test
> mode. When running in that mode, we'll assert that we were compiled
> with SANITIZE=leak. We'll then skip all tests, except those that we've
> opted-in by setting "TEST_PASSES_SANITIZE_LEAK=true".
> ...
> This is how tests that don't set "TEST_PASSES_SANITIZE_LEAK=true" will
> be skipped under GIT_TEST_PASSING_SANITIZE_LEAK=true:

I've been playing with this locally, but cannot shake the nagging
feeling that GIT_TEST_PASSING_SANITIZE_LEAK must default to true.
Otherwise, it is one more thing they need to find out and set when
they do

    make SANITYZE=leak test

because they want to be a good developer and to ensure that they did
not introduce new leaks.

If we want to encourage folks to locally run the leak checks before
declaring their own work "done", that is.

Those who are hunting for and cleaning up existing leaks can and
should set it to false, no?


In any case, here is a small fallout out of my adventure into this
corner.

----- >8 --------- >8 --------- >8 --------- >8 -----
Subject: t0006: date_mode can leak .strftime_fmt member

As there is no date_mode_release() API function, and given the
set of current callers it probably is not worth adding one, let's
release the .strftime_fmt member that is obtained from strdup()
before the caller of show_date() is done with it.

This allows us to mark t0006 as passing under the leak sanitizer.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/helper/test-date.c | 2 ++
 t/t0006-date.sh      | 2 ++
 2 files changed, 4 insertions(+)

diff --git c/t/helper/test-date.c w/t/helper/test-date.c
index 099eff4f0f..e15ea02626 100644
--- c/t/helper/test-date.c
+++ w/t/helper/test-date.c
@@ -53,6 +53,8 @@ static void show_dates(const char **argv, const char *format)
 
 		printf("%s -> %s\n", *argv, show_date(t, tz, &mode));
 	}
+
+	free((void *)mode.strftime_fmt);
 }
 
 static void parse_dates(const char **argv)
diff --git c/t/t0006-date.sh w/t/t0006-date.sh
index 6b757d7169..5d01f57b27 100755
--- c/t/t0006-date.sh
+++ w/t/t0006-date.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test date parsing and printing'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # arbitrary reference time: 2009-08-30 19:20:00