Fix runsc log collection in kokoro

PiperOrigin-RevId: 271207152

runsc/sandbox/sandbox.go

@@ -352,7 +352,7 @@ func (s *Sandbox) createSandboxProcess(conf *boot.Config, args *Args, startSyncF
 	}
 	if conf.DebugLog != "" {
 		test := ""
-		if len(conf.TestOnlyTestNameEnv) == 0 {
+		if len(conf.TestOnlyTestNameEnv) != 0 {
 			// Fetch test name if one is provided and the test only flag was set.
 			if t, ok := specutils.EnvVar(args.Spec.Process.Env, conf.TestOnlyTestNameEnv); ok {
 				test = t

scripts/common_bazel.sh

@@ -80,7 +80,7 @@ function collect_logs() {
     # Collect sentry logs, if any.
     if [[ -v RUNSC_LOGS_DIR ]] && [[ -d "${RUNSC_LOGS_DIR}" ]]; then
       local -r logs=$(ls "${RUNSC_LOGS_DIR}")
-      if [[ -z "${logs}" ]]; then
+      if [[ "${logs}" ]]; then
         tar --create --gzip --file="${KOKORO_ARTIFACTS_DIR}/${RUNTIME}.tar.gz" -C "${RUNSC_LOGS_DIR}" .
       fi
     fi