only report tasklogger is running if both stdout and stderr are still running (#8155)

* only report tasklogger is running if both stdout and stderr are still running

* changelog

CHANGELOG.md

@@ -25,6 +25,8 @@ BUG FIXES:
  * api: Fixed a bug where setting connect sidecar task resources could fail [[GH-7993](https://github.com/hashicorp/nomad/issues/7993)]
  * client: Fixed a bug where artifact downloads failed on redirects [[GH-7854](https://github.com/hashicorp/nomad/issues/7854)]
  * csi: Validate empty volume arguments in API. [[GH-8027](https://github.com/hashicorp/nomad/issues/8027)]
+ * client: Fixed a bug where stdout/stderr were not properly reopened for
+   community task drivers. [[GH-8155](https://github.com/hashicorp/nomad/issues/8155)]
 
 ## 0.11.2 (May 14, 2020)
 

client/logmon/logmon.go

@@ -110,14 +110,10 @@ type TaskLogger struct {
 
 // IsRunning will return true as long as one rotator wrapper is still running
 func (tl *TaskLogger) IsRunning() bool {
-	if tl.lro != nil && tl.lro.isRunning() {
-		return true
-	}
-	if tl.lre != nil && tl.lre.isRunning() {
-		return true
-	}
+	lroRunning := tl.lro != nil && tl.lro.isRunning()
+	lreRunning := tl.lre != nil && tl.lre.isRunning()
 
-	return false
+	return lroRunning && lreRunning
 }
 
 func (tl *TaskLogger) Close() {

client/logmon/logmon_test.go

@@ -234,8 +234,8 @@ func TestLogmon_Start_restart(t *testing.T) {
 	})
 	require.True(impl.tl.IsRunning())
 
-	// Close stdout and assert that logmon no longer writes to the file
-	require.NoError(stdout.Close())
+	// Close stderr and assert that logmon no longer writes to the file
+	// Keep stdout open to ensure that IsRunning requires both
 	require.NoError(stderr.Close())
 
 	testutil.WaitForResult(func() (bool, error) {