feat: add diagnostics and safe reset maintenance

internal/operationlock/lock_test.go

@@ -0,0 +1,30 @@
+package operationlock_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"proxyctl/internal/operationlock"
+)
+
+func TestLockSerializesIndependentInstancesAndHonorsContext(t *testing.T) {
+	path := t.TempDir() + "/proxyctl.lock"
+	first := operationlock.New(path)
+	second := operationlock.New(path)
+	unlock, err := first.Lock(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Millisecond)
+	defer cancel()
+	if _, err := second.Lock(ctx); err == nil {
+		t.Fatal("second lock acquired while first held")
+	}
+	unlock()
+	unlockSecond, err := second.Lock(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	unlockSecond()
+}