The environment variable $SHELL is usually set to the user's
interactive shell. We never use that shell for build and test scripts
because it might not be a POSIX shell.

Perf tests are run inside $SHELL via a wrapper defined in
t/perf/perf-lib.sh. Use $TEST_SHELL_PATH like elsewhere.

Signed-off-by: Johannes Altmanninger <redacted>
---

Regarding the inconsistency around $(SHELL) in Makefiles: we could do
something like

	-SHELL_PATH ?= $(SHELL)
	+SHELL_PATH ?= /bin/sh
	+SHELL = $(SHELL_PATH)

in some Makefiles. Though the upside (consistency & slightly easier to build
with broken /bin/sh) seems fairly low, so I'd leave it be.

 t/perf/perf-lib.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/perf/perf-lib.sh b/t/perf/perf-lib.sh
index f5ed092ee5..e6b59ecbf7 100644
--- a/t/perf/perf-lib.sh
+++ b/t/perf/perf-lib.sh

@@ -157,7 +157,7 @@ test_run_perf_ () {
 	test_cleanup=:
 	test_export_="test_cleanup"
 	export test_cleanup test_export_
-	"$GTIME" -f "%E %U %S" -o test_time.$i "$SHELL" -c '
+	"$GTIME" -f "%E %U %S" -o test_time.$i "$TEST_SHELL_PATH" -c '
 . '"$TEST_DIRECTORY"/test-lib-functions.sh'
 test_export () {
 	test_export_="$test_export_ $*"

-- 
2.33.0.rc2.dirty