Cherry-pick MM-66789: Restrict log downloads to a root path for support packets (#35164)

Automatic Merge

server/channels/testlib/helper.go

@@ -35,6 +35,7 @@ type MainHelper struct {
 
 	status           int
 	testResourcePath string
+	testLogsPath     string
 	replicas         []string
 	storePool        *sqlstore.TestPool
 }
@@ -88,6 +89,15 @@ func NewMainHelperWithOptions(options *HelperOptions) *MainHelper {
 		log.Fatal(err)
 	}
 
+	// Create a logs directory and set MM_LOG_PATH for tests that validate log file paths.
+	// This is done unconditionally so tests don't need to enable full resources just for logging.
+	logsDir, err := os.MkdirTemp("", "testlogs")
+	if err != nil {
+		log.Fatal("Failed to create test logs directory: " + err.Error())
+	}
+	os.Setenv("MM_LOG_PATH", logsDir)
+	mainHelper.testLogsPath = logsDir
+
 	if options != nil {
 		mainHelper.Options = *options
 
@@ -293,6 +303,10 @@ func (h *MainHelper) Close() error {
 	if h.testResourcePath != "" {
 		os.RemoveAll(h.testResourcePath)
 	}
+	if h.testLogsPath != "" {
+		os.RemoveAll(h.testLogsPath)
+		os.Unsetenv("MM_LOG_PATH")
+	}
 
 	if h.storePool != nil {
 		h.storePool.Close()