test-lib: stop showing old leak logs

We ask LSan to record the logs of all leaks in test-results/, which is
useful for finding leaks that didn't trigger a test failure.

We don't clean out the leak/ directory for each test before running it,
though. Instead, we count the number of files it has, and complain only
if we ended up with more when the script finishes. So we shouldn't
trigger any output if you've made a script leak free. But if you simply
_reduced_ the number of leaks, then there is an annoying outcome: we do
not record which logs were from this run and which were from previous
ones. So when we dump them to stdout, you get a mess of
possibly-outdated leaks. This is very confusing when you are in an
edit-compile-test cycle trying to fix leaks.

The instructions do note that you should "rm -rf test-results/" if you
want to avoid this. But I'm having trouble seeing how this cumulative
count could ever be useful. It is not even counting the number of leaks,
but rather the number of processes with at least one leak!

So let's just blow away the per-test leak/ directory before running. We
already overwrite the ".out" file in test-results/ in the same way, so
this is following that pattern.

Running "make test" isn't affected by this, since it blows away all of
test-results/ already. This only comes up when you are iterating on a
single script that you're running manually.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

t/test-lib.sh

@@ -322,7 +322,6 @@ TEST_RESULTS_SAN_FILE_PFX=trace
 TEST_RESULTS_SAN_DIR_SFX=leak
 TEST_RESULTS_SAN_FILE=
 TEST_RESULTS_SAN_DIR="$TEST_RESULTS_DIR/$TEST_NAME.$TEST_RESULTS_SAN_DIR_SFX"
-TEST_RESULTS_SAN_DIR_NR_LEAKS_STARTUP=
 TRASH_DIRECTORY="trash directory.$TEST_NAME$TEST_STRESS_JOB_SFX"
 test -n "$root" && TRASH_DIRECTORY="$root/$TRASH_DIRECTORY"
 case "$TRASH_DIRECTORY" in
@@ -1215,42 +1214,15 @@ test_atexit_handler () {
 	teardown_malloc_check
 }
 
-sanitize_leak_log_message_ () {
-	local new="$1" &&
-	local old="$2" &&
-	local file="$3" &&
-
-	printf "With SANITIZE=leak at exit we have %d leak logs, but started with %d
-
-This means that we have a blindspot where git is leaking but we're
-losing the exit code somewhere, or not propagating it appropriately
-upwards!
-
-See the logs at \"%s.*\";
-those logs are reproduced below." \
-	       "$new" "$old" "$file"
-}
-
 check_test_results_san_file_ () {
 	if test -z "$TEST_RESULTS_SAN_FILE"
 	then
 		return
 	fi &&
-	local old="$TEST_RESULTS_SAN_DIR_NR_LEAKS_STARTUP" &&
-	local new="$(nr_san_dir_leaks_)" &&
-
-	if test $new -le $old
+	if test "$(nr_san_dir_leaks_)" = 0
 	then
 		return
 	fi &&
-	local out="$(sanitize_leak_log_message_ "$new" "$old" "$TEST_RESULTS_SAN_FILE")" &&
-	say_color error "$out" &&
-	if test "$old" != 0
-	then
-		echo &&
-		say_color error "The logs include output from past runs to avoid" &&
-		say_color error "that remove 'test-results' between runs."
-	fi &&
 	say_color error "$(cat "$TEST_RESULTS_SAN_FILE".*)" &&
 
 	if test -n "$passes_sanitize_leak" && test "$test_failure" = 0
@@ -1586,16 +1558,13 @@ then
 		test_done
 	fi
 
+	rm -rf "$TEST_RESULTS_SAN_DIR"
 	if ! mkdir -p "$TEST_RESULTS_SAN_DIR"
 	then
 		BAIL_OUT "cannot create $TEST_RESULTS_SAN_DIR"
 	fi &&
 	TEST_RESULTS_SAN_FILE="$TEST_RESULTS_SAN_DIR/$TEST_RESULTS_SAN_FILE_PFX"
 
-	# In case "test-results" is left over from a previous
-	# run: Only report if new leaks show up.
-	TEST_RESULTS_SAN_DIR_NR_LEAKS_STARTUP=$(nr_san_dir_leaks_)
-
 	# Don't litter *.leak dirs if there was nothing to report
 	test_atexit "rmdir \"$TEST_RESULTS_SAN_DIR\" 2>/dev/null || :"