Fix test runner crash when not in a git repo

Respect `inside_git_repo()` when checking performance stats.

1 files changed, 10 insertions, 6 deletions

diff --git a/testsuite/driver/perf_notes.py b/testsuite/driver/perf_notes.py
index 365732ca69..2b4835392c 100644
--- a/testsuite/driver/perf_notes.py
+++ b/testsuite/driver/perf_notes.py
@@ -23,13 +23,17 @@ from testutil import passed, failBecause
 
 # Check if "git rev-parse" can be run successfully.
 # True implies the current directory is a git repo.
+_inside_git_repo_cache = None
 def inside_git_repo():
-    try:
-        subprocess.check_call(['git', 'rev-parse', 'HEAD'],
-                              stdout=subprocess.DEVNULL)
-        return True
-    except subprocess.CalledProcessError:
-        return False
+    global _inside_git_repo_cache
+    if _inside_git_repo_cache == None:
+        try:
+            subprocess.check_call(['git', 'rev-parse', 'HEAD'],
+                                stdout=subprocess.DEVNULL)
+            _inside_git_repo_cache = True
+        except subprocess.CalledProcessError:
+            _inside_git_repo_cache = False
+    return _inside_git_repo_cache
 
 # Check if the worktree is dirty.
 def is_worktree_dirty():