When the TEST_OUTPUT_DIRECTORY is defined, then all test data will be
written in that directory instead of the default directory located in
"t/". While this works as expected for our normal tests, performance
tests fail to locate and aggregate performance data because they don't
know to handle TEST_OUTPUT_DIRECTORY correctly and always look at the
default location.

Fix the issue by adding a `--results-dir` parameter to "aggregate.perl"
which identifies the directory where results are and by making the "run"
script awake of the TEST_OUTPUT_DIRECTORY variable.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 t/perf/aggregate.perl |  8 ++++++--
 t/perf/perf-lib.sh    |  4 ++--
 t/perf/run            | 25 ++++++++++++++++---------
 3 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/t/perf/aggregate.perl b/t/perf/aggregate.perl
index 14e4cda287..5d4964c5c6 100755
--- a/t/perf/aggregate.perl
+++ b/t/perf/aggregate.perl
@@ -58,6 +58,7 @@ sub usage {
   Options:
     --codespeed          * Format output for Codespeed
     --reponame    <str>  * Send given reponame to codespeed
+    --results-dir <str>  * Directory where test results are located
     --sort-by     <str>  * Sort output (only "regression" criteria is supported)
     --subsection  <str>  * Use results from given subsection
 
@@ -90,12 +91,13 @@ sub sane_backticks {
 }
 
 my (@dirs, %dirnames, %dirabbrevs, %prefixes, @tests,
-    $codespeed, $sortby, $subsection, $reponame);
+    $codespeed, $sortby, $subsection, $reponame, $resultsdir);
 
 Getopt::Long::Configure qw/ require_order /;
 
 my $rc = GetOptions("codespeed"     => \$codespeed,
 		    "reponame=s"    => \$reponame,
+		    "results-dir=s" => \$resultsdir,
 		    "sort-by=s"     => \$sortby,
 		    "subsection=s"  => \$subsection);
 usage() unless $rc;
@@ -137,7 +139,9 @@ sub sane_backticks {
 	@tests = glob "p????-*.sh";
 }
 
-my $resultsdir = "test-results";
+if (not $resultsdir) {
+	$resultsdir = "test-results";
+}
 
 if (! $subsection and
     exists $ENV{GIT_PERF_SUBSECTION} and
diff --git a/t/perf/perf-lib.sh b/t/perf/perf-lib.sh
index 601d9f67dd..8ca6dd0297 100644
--- a/t/perf/perf-lib.sh
+++ b/t/perf/perf-lib.sh
@@ -45,7 +45,7 @@ export TEST_DIRECTORY TRASH_DIRECTORY GIT_BUILD_DIR GIT_TEST_CMP
 MODERN_GIT=$GIT_BUILD_DIR/bin-wrappers/git
 export MODERN_GIT
 
-perf_results_dir=$TEST_OUTPUT_DIRECTORY/test-results
+perf_results_dir=$TEST_RESULTS_DIR
 test -n "$GIT_PERF_SUBSECTION" && perf_results_dir="$perf_results_dir/$GIT_PERF_SUBSECTION"
 mkdir -p "$perf_results_dir"
 rm -f "$perf_results_dir"/$(basename "$0" .sh).subtests
@@ -253,7 +253,7 @@ test_size () {
 # and does it after running everything)
 test_at_end_hook_ () {
 	if test -z "$GIT_PERF_AGGREGATING_LATER"; then
-		( cd "$TEST_DIRECTORY"/perf && ./aggregate.perl $(basename "$0") )
+		( cd "$TEST_DIRECTORY"/perf && ./aggregate.perl --results-dir="$TEST_RESULTS_DIR" $(basename "$0") )
 	fi
 }
 
diff --git a/t/perf/run b/t/perf/run
index c7b86104e1..03128d440a 100755
--- a/t/perf/run
+++ b/t/perf/run
@@ -188,10 +188,10 @@ run_subsection () {
 
 	if test -z "$GIT_PERF_SEND_TO_CODESPEED"
 	then
-		./aggregate.perl $codespeed_opt "$@"
+		./aggregate.perl --results-dir="$TEST_RESULTS_DIR" $codespeed_opt "$@"
 	else
-		json_res_file="test-results/$GIT_PERF_SUBSECTION/aggregate.json"
-		./aggregate.perl --codespeed "$@" | tee "$json_res_file"
+		json_res_file=""$TEST_RESULTS_DIR"/$GIT_PERF_SUBSECTION/aggregate.json"
+		./aggregate.perl --results-dir="$TEST_RESULTS_DIR" --codespeed "$@" | tee "$json_res_file"
 		send_data_url="$GIT_PERF_SEND_TO_CODESPEED/result/add/json/"
 		curl -v --request POST --data-urlencode "json=$(cat "$json_res_file")" "$send_data_url"
 	fi
@@ -203,10 +203,17 @@ get_var_from_env_or_config "GIT_PERF_SEND_TO_CODESPEED" "perf" "sendToCodespeed"
 cd "$(dirname $0)"
 . ../../GIT-BUILD-OPTIONS
 
-mkdir -p test-results
-get_subsections "perf" >test-results/run_subsections.names
+if test -n "$TEST_OUTPUT_DIRECTORY"
+then
+    TEST_RESULTS_DIR="$TEST_OUTPUT_DIRECTORY/test-results"
+else
+    TEST_RESULTS_DIR=test-results
+fi
 
-if test $(wc -l <test-results/run_subsections.names) -eq 0
+mkdir -p "$TEST_RESULTS_DIR"
+get_subsections "perf" >"$TEST_RESULTS_DIR"/run_subsections.names
+
+if test $(wc -l <"$TEST_RESULTS_DIR"/run_subsections.names) -eq 0
 then
 	if test -n "$GIT_PERF_SUBSECTION"
 	then
@@ -222,10 +229,10 @@ then
 	)
 elif test -n "$GIT_PERF_SUBSECTION"
 then
-	egrep "^$GIT_PERF_SUBSECTION\$" test-results/run_subsections.names >/dev/null ||
+	egrep "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names >/dev/null ||
 		die "subsection '$GIT_PERF_SUBSECTION' not found in '$GIT_PERF_CONFIG_FILE'"
 
-	egrep "^$GIT_PERF_SUBSECTION\$" test-results/run_subsections.names | while read -r subsec
+	egrep "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names | while read -r subsec
 	do
 		(
 			GIT_PERF_SUBSECTION="$subsec"
@@ -243,5 +250,5 @@ else
 			echo "======== Run for subsection '$GIT_PERF_SUBSECTION' ========"
 			run_subsection "$@"
 		)
-	done <test-results/run_subsections.names
+	done <"$TEST_RESULTS_DIR"/run_subsections.names
 fi
-- 
2.31.1