[PATCH] test-lib: GIT_TEST_SANITIZE_LEAK_LOG enabled by default

["Rubén Justo" <rjusto@gmail.com>]

As we describe in t/README, it can happen that:

     Some tests run "git" (or "test-tool" etc.) without properly checking
     the exit code, or git will invoke itself and fail to ferry the
     abort() exit code to the original caller.

Therefore, GIT_TEST_SANITIZE_LEAK_LOG must be set to true to capture all
memory leaks triggered by the tests when SANITIZE=leak.

Set it to true by default, and stop worrying about someone checking for
leaks who isn't aware of this option and might be missing some leaks.

Signed-off-by: Rubén Justo <rjusto@gmail.com>
---
  ci/lib.sh     | 1 -
  t/README      | 4 ++--
  t/test-lib.sh | 2 +-
  3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/ci/lib.sh b/ci/lib.sh
index ff66ad356b..fe52954828 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -374,7 +374,6 @@ linux-musl)
  linux-leaks|linux-reftable-leaks)
  	export SANITIZE=leak
  	export GIT_TEST_PASSING_SANITIZE_LEAK=true
-	export GIT_TEST_SANITIZE_LEAK_LOG=true
  	;;
  linux-asan-ubsan)
  	export SANITIZE=address,undefined
diff --git a/t/README b/t/README
index d9e0e07506..1c97bc3331 100644
--- a/t/README
+++ b/t/README
@@ -382,10 +382,10 @@ mapping between "TEST_PASSES_SANITIZE_LEAK=true" 
and those tests that
  pass under "SANITIZE=leak". This is especially useful when testing a
  series that fixes various memory leaks with "git rebase -x".

-GIT_TEST_SANITIZE_LEAK_LOG=true will log memory leaks to
+GIT_TEST_SANITIZE_LEAK_LOG=<boolean> controls logging of memory leaks to
  "test-results/$TEST_NAME.leak/trace.*" files. The logs include a
  "dedup_token" (see +"ASAN_OPTIONS=help=1 ./git") and other options to
-make logs +machine-readable.
+make logs +machine-readable.  Defaults to "true" when SANITIZE=leak.

  With GIT_TEST_SANITIZE_LEAK_LOG=true we'll look at the leak logs
  before exiting and exit on failure if the logs showed that we had a
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 7ed6d3fc47..1dd2ea4e07 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1578,7 +1578,7 @@ then
  		test_done
  	fi

-	if test_bool_env GIT_TEST_SANITIZE_LEAK_LOG false
+	if test_bool_env GIT_TEST_SANITIZE_LEAK_LOG true
  	then
  		if ! mkdir -p "$TEST_RESULTS_SAN_DIR"
  		then
-- 
2.45.1