src/daemon: add entrypoint for ceph-volume to mount OSDs only

[eljabsheh]

Adds: "-e CEPH_DAEMON=OSD_CEPH_VOLUME_ACTIVATE_ONLY" .
After osd.id lvm is (unlocked)+mounted, the entrypoint calls stayalive
in order to stay running without starting ceph-osd service. This
entrypoint enables maintenance of OSDs in containerized_deployment.

Closes: BZ - 1811910

Signed-off-by: utp887 R.Martinez@redhat.com

[eljabsheh]

@dsavineau this is what I had in mind for a 'maintenance' entrypoint, where we would be able to run ceph-objectstore-tool/ceph-bluestore-tool.

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[dsavineau]

I think we don't need to duplicate the whole osd_volume_activate.sh code just for removing the ceph-osd start line.
So we should do the same than osd_disk_activate with a start parameter.
Also I don't think we should set the STAYALIVE variable in the entrypoint but let the user set -e DEBUG=stayalive instead with the container CLI.

[gpocentek]

Would a change like this make more sense? If so I can push another PR.

diff --git a/src/daemon/entrypoint.sh.in b/src/daemon/entrypoint.sh.in
index 6b1355e9..46447376 100755
--- a/src/daemon/entrypoint.sh.in
+++ b/src/daemon/entrypoint.sh.in
@@ -100,6 +100,14 @@ case "$CEPH_DAEMON" in
     source /opt/ceph-container/bin/osd_volume_activate.sh
     osd_volume_activate
     ;;
+  osd_ceph_volume_shell)
+    ami_privileged
+    # shellcheck disable=SC1091
+    # TAG: osd_ceph_volume_activate
+    NO_OSD_START=true
+    source /opt/ceph-container/bin/osd_volume_activate.sh
+    osd_volume_activate
+    ;;
   mds)
     # TAG: mds
     source /opt/ceph-container/bin/start_mds.sh
diff --git a/src/daemon/osd_scenarios/osd_volume_activate.sh b/src/daemon/osd_scenarios/osd_volume_activate.sh
index 275b31af..9c4b6b98 100644
--- a/src/daemon/osd_scenarios/osd_volume_activate.sh
+++ b/src/daemon/osd_scenarios/osd_volume_activate.sh
@@ -125,5 +125,10 @@ function osd_volume_activate {
   # LimitNOFILE=1048576
   # LimitNPROC=1048576
   ulimit -n 1048576 -u 1048576
-  exec /usr/bin/ceph-osd "${DAEMON_OPTS[@]}" -i "${OSD_ID}"
+
+  if [[ "$NO_OSD_START" == "true" ]]; then
+    /bin/bash
+  else
+    exec /usr/bin/ceph-osd "${DAEMON_OPTS[@]}" -i "${OSD_ID}"
+  fi
 }

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