extras: Added (hook) scripts to start/stop samba on volume start and stop

These are example/helper scripts that demonstrate how one could
leverage the recently added hooks interface in glusterd.
The scripts are in 'beta'.

Change-Id: I7aaf999f3bdfb276ef64e115a57cbdb36c7a896e
BUG: 806996
Signed-off-by: Krishnan Parthasarathi <kp@gluster.com>
Reviewed-on: http://review.gluster.com/3086
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

extras/hook-scripts/S30samba-start.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+#Need to be copied to hooks/<HOOKS_VER>/start/post
+
+PROGNAME="Ssamba-start"
+OPTSPEC="volname:,mnt:"
+VOL=
+#FIXME: glusterd hook interface will eventually provide mntpt prefix as
+# command line arg
+MNT_PRE="/mnt/samba"
+
+function parse_args () {
+        ARGS=$(getopt -l $OPTSPEC  -name $PROGNAME $@)
+        eval set -- "$ARGS"
+
+        while true; do
+        case $1 in
+        --volname)
+         shift
+         VOL=$1
+         ;;
+        --mnt)
+         shift
+         MNT_PRE=$1
+         ;;
+        *)
+         shift
+         break
+         ;;
+        esac
+        shift
+        done
+}
+
+function add_samba_export () {
+        volname=$1
+        mnt_pre=$2
+        mkdir -p $mnt_pre/$volname && \
+        printf "\n[gluster-$volname]\ncomment=For samba export of volume $volname\npath=$mnt_pre/$volname\nread only=no\nguest ok=yes\n" >> /etc/samba/smb.conf
+}
+
+function mount_volume () {
+        volname=$1
+        mnt_pre=$2
+        #Mount shouldn't block on glusterd to fetch volfile, hence the 'bg'
+        mount -t glusterfs `hostname`:$volname $mnt_pre/$volname &
+}
+
+function sighup_samba () {
+        pid=`cat /var/run/smbd.pid`
+        if [ $pid != "" ]
+        then
+                kill -HUP $pid;
+        else
+                /etc/init.d/smb start
+        fi
+}
+
+
+parse_args $@
+add_samba_export $VOL $MNT_PRE
+mount_volume $VOL $MNT_PRE
+sighup_samba

extras/hook-scripts/S30samba-stop.sh

@@ -0,0 +1,60 @@
+#! /bin/bash
+#Need to be copied to hooks/<HOOKS_VER>/stop/post
+
+PROGNAME="Ssamba-stop"
+OPTSPEC="volname:,mnt:"
+VOL=
+#FIXME: gluster will eventually pass mnt prefix as command line argument
+MNT_PRE="/mnt/samba"
+
+function parse_args () {
+        ARGS=$(getopt -l $OPTSPEC  -name $PROGNAME $@)
+        eval set -- "$ARGS"
+
+        while true; do
+        case $1 in
+        --volname)
+         shift
+         VOL=$1
+         ;;
+        --mnt)
+         shift
+         MNT_PRE=$1
+         echo $1
+         ;;
+        *)
+         shift
+         break
+         ;;
+        esac
+        shift
+        done
+}
+
+function del_samba_export () {
+        volname=$1
+        cp /etc/samba/smb.conf /tmp/smb.conf
+        sed -i "/gluster-$volname/,/^$/d" /tmp/smb.conf &&\
+                mv /tmp/smb.conf /etc/samba/smb.conf
+}
+
+function umount_volume () {
+        volname=$1
+        mnt_pre=$2
+        umount -l $mnt_pre/$volname
+}
+
+function sighup_samba () {
+        pid=`cat /var/run/smbd.pid`
+        if [ $pid != "" ]
+        then
+                kill -HUP $pid;
+        else
+                /etc/init.d/smb start
+        fi
+}
+
+parse_args $@
+del_samba_export $VOL
+umount_volume $VOL $MNT_PRE
+sighup_samba