scripts/shared_storage : systemd helper scripts to mount shared storage post reboot

Reported-by: Hendrik Visage <hvjunk@gmail.com>
Change-Id: Ibcff56b00f45c8af54c1ae04974267c2180f5f63
BUG: 1452527
Signed-off-by: Jiffin Tony Thottan <jthottan@redhat.com>
Reviewed-on: https://review.gluster.org/17339
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

4 files changed, 57 insertions, 4 deletions

diff --git a/extras/Makefile.am b/extras/Makefile.am
index 3af11032f6b..68637724a48 100644
--- a/extras/Makefile.am
+++ b/extras/Makefile.am
@@ -1,5 +1,8 @@
 addonexecdir = $(GLUSTERFS_LIBEXECDIR)
 addonexec_SCRIPTS = peer_add_secret_pub
+if USE_SYSTEMD
+addonexec_SCRIPTS += mount-shared-storage.sh
+endif
 
 EditorModedir = $(docdir)
 EditorMode_DATA = glusterfs-mode.el glusterfs.vim
@@ -22,7 +25,8 @@ EXTRA_DIST = $(conf_DATA) specgen.scm glusterfs-mode.el glusterfs.vim \
 	disk_usage_sync.sh clear_xattrs.sh glusterd-sysconfig glusterd.vol \
 	post-upgrade-script-for-quota.sh pre-upgrade-script-for-quota.sh \
 	command-completion/gluster.bash command-completion/Makefile \
-	command-completion/README stop-all-gluster-processes.sh clang-checker.sh
+	command-completion/README stop-all-gluster-processes.sh clang-checker.sh \
+	mount-shared-storage.sh
 
 install-data-local:
 	if [ -n "$(tmpfilesdir)" ]; then \
diff --git a/extras/mount-shared-storage.sh b/extras/mount-shared-storage.sh
new file mode 100755
index 00000000000..038a59aaabf
--- /dev/null
+++ b/extras/mount-shared-storage.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+#Post reboot there is a chance in which mounting of shared storage will fail
+#This will impact starting of features like NFS-Ganesha. So this script will
+#try to mount the shared storage if it fails
+#TODO : Do it for other glusterfs clients in /etc/fstab
+
+ms="var-run-gluster-shared_storage.mount"
+volume="gluster_shared_storage"
+failed=$(systemctl --failed | grep -c $ms)
+if [ $failed -eq 1 ]
+then
+        if systemctl restart $ms
+        then
+                #Restart worked just wait for sometime to make it reflect
+                sleep 5
+        else
+                #Restart failed, no point in further continuing
+                exit 1
+        fi
+fi
+
+# If we've reached this point, there wasn't a failed mountpoint
+# BUT we need to check for whether this haven't been called before the attempts
+# to the filesystem mounts, thus we need to check whether there is a glusterfs
+# in fstab and aren't mountedmount
+
+#In the logs I've seen ~4-5secs between the initial mount/start and the unmount
+
+gfc=$(sed -e 's/#.$//' </etc/fstab | grep -c $volume)
+gfm=$(grep -i $volume /proc/mounts | wc -l)
+
+if [ $gfm -lt $gfc ]
+then
+        exit 1
+fi
+
+exit 0
diff --git a/extras/systemd/Makefile.am b/extras/systemd/Makefile.am
index 5b9b117efaf..3988b40bce6 100644
--- a/extras/systemd/Makefile.am
+++ b/extras/systemd/Makefile.am
@@ -1,9 +1,9 @@
-CLEANFILES = glusterd.service glustereventsd.service
-EXTRA_DIST = glusterd.service.in glustereventsd.service.in
+CLEANFILES = glusterd.service glustereventsd.service glusterfssharedstorage.service
+EXTRA_DIST = glusterd.service.in glustereventsd.service.in glusterfssharedstorage.service.in
 
 if USE_SYSTEMD
 # systemddir is already defined through configure.ac
-systemd_DATA = glusterd.service
+systemd_DATA = glusterd.service glusterfssharedstorage.service
 
 if BUILD_EVENTS
 systemd_DATA += glustereventsd.service
diff --git a/extras/systemd/glusterfssharedstorage.service.in b/extras/systemd/glusterfssharedstorage.service.in
new file mode 100644
index 00000000000..3bceba84215
--- /dev/null
+++ b/extras/systemd/glusterfssharedstorage.service.in
@@ -0,0 +1,12 @@
+[Unit]
+Description=Mount glusterfs sharedstorage
+Requires=glusterd.service remote-fs-pre.target local-fs.target
+
+[Service]
+ExecStart=@GLUSTERFS_LIBEXECDIR@/mount-shared-storage.sh
+Restart=on-failure
+RestartSec=3
+RestartForceExitStatus=1
+
+[Install]
+WantedBy=multi-user.target