ceph: add signal handling for log collector

The log collector was not responding to SIGINT or SIGTERM correctly
since the parent bash process did not have the job control functionality
enabled. Now any signal received on bash will exit the container
immediately.

Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit a649f64)

pkg/operator/ceph/controller/spec.go

@@ -67,8 +67,6 @@ var logger = capnslog.NewPackageLogger("github.com/rook/rook", "ceph-spec")
 
 var (
 	cronLogRotate = `
-set -xe
-
 CEPH_CLIENT_ID=%s
 PERIODICITY=%s
 LOG_ROTATE_CEPH_FILE=/etc/logrotate.d/ceph
@@ -625,13 +623,18 @@ func LogCollectorContainer(daemonID, ns string, c cephv1.ClusterSpec) *v1.Contai
 		Name: logCollector,
 		Command: []string{
 			"/bin/bash",
-			"-c",
+			"-x", // Print commands and their arguments as they are executed
+			"-e", // Exit immediately if a command exits with a non-zero status.
+			"-m", // Terminal job control, allows job to be terminated by SIGTERM
+			"-c", // Command to run
 			fmt.Sprintf(cronLogRotate, daemonID, c.LogCollector.Periodicity),
 		},
 		Image:           c.CephVersion.Image,
 		VolumeMounts:    DaemonVolumeMounts(config.NewDatalessDaemonDataPathMap(ns, c.DataDirHostPath), ""),
 		SecurityContext: PodSecurityContext(),
 		Resources:       cephv1.GetLogCollectorResources(c.Resources),
+		// We need a TTY for the bash job control (enabled by -m)
+		TTY: true,
 	}
 }