cli/hooks : Add volume set options to enable/disable nfs-ganesha support.

1. gluster volume set nfs-ganesha.enable ON/OFF
If the option is set to ON, the volume field in the nfs-ganesha configuartion file is
edited. Gluster-nfs is disabled on that volume and the volume is exported using
nfs-ganesha.

2.gluster volume set nfs-ganesha.host IP
This is used to provide the IP of the nfs-ganesha host.

Note : nfs-ganesha.host MUST be set before using nfs-ganesha.enable ON

The switch from gluster-nfs to nfs-ganesha is mostly done by the hook-scripts
in the post phase of the 'set' option. As a result, gluster volume reset does not
function as it is expected to. By default, nfs-ganesha will be set to off but the
process  will not be killed.

Hence, a few changes have to be made post 'reset' option as well. Those changes
also have been added.

Change-Id: I7fdc14ee49d1724af96eda33c6a3ec08b1020788
BUG: 1092283
Signed-off-by: Meghana <mmadhusu@redhat.com>
Reviewed-on: http://review.gluster.org/7321
Reviewed-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-by: Santosh Pradhan <spradhan@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

2 files changed, 248 insertions, 1 deletions

diff --git a/extras/hook-scripts/set/post/Makefile.am b/extras/hook-scripts/set/post/Makefile.am
index 9ded234cf9b..3ec25d94134 100644
--- a/extras/hook-scripts/set/post/Makefile.am
+++ b/extras/hook-scripts/set/post/Makefile.am
@@ -1 +1 @@
-EXTRA_DIST = S30samba-set.sh
+EXTRA_DIST = S30samba-set.sh S31ganesha-set.sh
diff --git a/extras/hook-scripts/set/post/S31ganesha-set.sh b/extras/hook-scripts/set/post/S31ganesha-set.sh
new file mode 100755
index 00000000000..3b74c766b7d
--- /dev/null
+++ b/extras/hook-scripts/set/post/S31ganesha-set.sh
@@ -0,0 +1,247 @@
+#!/bin/bash
+PROGNAME="Sganesha-set"
+OPTSPEC="volname:"
+VOL=
+declare -i EXPORT_ID
+CONF1="/var/lib/ganesha/nfs-ganesha.conf"
+LOG="/tmp/ganesha.log"
+gnfs="enabled"
+enable_ganesha=""
+host_name="none"
+IS_HOST_SET="NO"
+LOC=""
+
+
+
+function parse_args ()
+{
+        ARGS=$(getopt -l $OPTSPEC  -o "o" -name $PROGNAME $@)
+        eval set -- "$ARGS"
+
+        while true; do
+            case $1 in
+            --volname)
+                shift
+                VOL=$1
+                ;;
+            *)
+                shift
+                for pair in $@; do
+                        read key value < <(echo "$pair" | tr "=" " ")
+                        case "$key" in
+                          "nfs-ganesha.enable")
+                                    enable_ganesha=$value
+                                    ;;
+                          "nfs-ganesha.host")
+                                    host_name=$value
+                                    ;;
+                            *)
+                                    ;;
+                        esac
+                done
+
+                shift
+                break
+                ;;
+            esac
+            shift
+        done
+}
+
+
+function check_if_host_set()
+{
+        if cat /var/lib/glusterd/vols/$VOL/info | grep -q "nfs-ganesha.host"
+                then
+                IS_HOST_SET="YES"
+        fi
+}
+
+function check_nfsd_loc()
+{
+        if ls /usr/bin | grep "[g]anesha.nfsd"
+                then
+                LOC="/usr"
+        else
+                LOC="/usr/local"
+        fi
+}
+
+
+function check_gluster_nfs()
+{
+        if cat /var/lib/glusterd/vols/$VOL/info | grep -q "nfs.disable=ON"
+                 then
+                 gnfs="disabled"
+        fi
+}
+
+#This function generates a new export entry as export.volume_name.conf
+function write_conf()
+{
+        echo "EXPORT{
+        "
+        echo "Export_Id = ;"
+        echo "Path=\"/$1\";"
+        echo "FSAL {
+        "
+        echo "name = "GLUSTER";"
+        echo "hostname=\"$2\";"
+        echo  "volume=\"$1\";"
+        echo "}"
+        echo "Access_type = RW;"
+        echo "Squash = No_root_squash;"
+        echo "Pseudo=\"/$1\";"
+        echo "NFS_Protocols = \"3,4\" ;"
+        echo "Transport_Protocols = \"UDP,TCP\" ;"
+        echo "SecType = \"sys\";"
+        echo "Tag = \"$1\";"
+        echo "}"
+}
+
+#This function keeps track of export IDs and increments it with every new entry
+function export_add()
+{
+        count=`ls -l /var/lib/ganesha/exports/*.conf | wc -l`
+        if [ "$count" = "1" ] ;
+                then
+                EXPORT_ID=1
+        else
+        #if [ -s /var/lib/ganesha/export_removed ];
+        #               then
+        #               EXPORT_ID=`head -1 /var/lib/ganesha/export_removed`
+        #               sed -i -e "1d" /var/lib/ganesha/export_removed
+        #               else
+
+                 EXPORT_ID=`cat /var/lib/ganesha/export_added`
+                 EXPORT_ID=EXPORT_ID+1
+        #fi
+        fi
+        echo $EXPORT_ID > /var/lib/ganesha/export_added
+        sed -i s/Export_Id.*/"Export_Id = $EXPORT_ID;"/ \
+/var/lib/ganesha/exports/export.$VOL.conf
+        echo "%include \"/var/lib/ganesha/exports/export.$VOL.conf\"" >> $CONF1
+
+
+}
+
+function export_remove()
+{
+        $removed_id=`cat /var/lib/ganesha/exports/export.$VOL.conf | grep Export_Id | cut -d " " -f3`
+        echo $removed_id >> /var/lib/ganesha/export_removed
+}
+
+function start_ganesha()
+{
+        if [ "$IS_HOST_SET" = "NO" ]
+                then
+                gluster volume set $VOL nfs-ganesha.enable OFF
+        else
+                check_gluster_nfs
+
+                #Remove export entry from nfs-ganesha.conf
+                sed -i /$VOL.conf/d  $CONF1
+                pkill ganesha.nfsd
+                sleep 10
+                gluster volume set $VOL  nfs.disable ON
+                sleep 4
+
+                #Create a new export entry
+                export_add
+                if ls /usr/bin/ | grep -q "ganesha.nfsd"
+                        then
+                        sed -i s/FSAL_Shared.*/FSAL_Shared_Library=\
+"\"\/usr\/lib64\/ganesha\/libfsalgluster.so\";"/ $CONF1
+                        /usr/bin/ganesha.nfsd -f $CONF1 -L $LOG -N NIV_FULL_DEBUG -d
+                        sleep 2
+                else
+                        sed -i s/FSAL_Shared.*/FSAL_Shared_Library=\
+"\"\/usr\/local\/lib64\/ganesha\/libfsalgluster.so\";"/ $CONF1
+                       /usr/local/bin/ganesha.nfsd -f $CONF1 -L $LOG -N NIV_FULL_DEBUG -d
+                       sleep 2
+                fi
+
+                if ! ps aux | grep -q "[g]anesha.nfsd"
+                        then
+                                if [ "$gnfs" = "enabled" ]
+                                        then
+                                        gluster volume set $VOL nfs.disable OFF
+                                fi
+                         rm -rf /var/lib/ganesha/exports/*
+                         rm -rf /var/lib/ganesha/export_added
+                         gluster volume set $VOL nfs-ganesha.enable OFF
+                         gluster volume set $VOL nfs-ganesha.host none
+                         exit 1
+                fi
+         fi
+
+}
+
+#This function generates a new config file when ganesha.host is set
+#If the volume is already exported, only hostname is changed
+function set_hostname()
+{
+        if  ! ls /var/lib/ganesha/exports/  | grep -q $VOL.conf
+                then
+                write_conf $VOL $host_name >\
+/var/lib/ganesha/exports/export.$VOL.conf
+        else
+                sed -i  s/hostname.*/"hostname=\
+\"$host_name\";"/ /var/lib/ganesha/exports/export.$VOL.conf
+        fi
+
+}
+
+
+function stop_ganesha()
+{
+        if  ps aux | grep -q  "[g]anesha.nfsd"
+                then
+                pkill ganesha.nfsd
+                sleep 10
+        fi
+        gluster vol set $VOL nfs-ganesha.host none
+        #Remove the specfic export configuration file
+        rm -rf /var/lib/ganesha/exports/export.$VOL.conf
+        #Remove that entry from nfs-ganesha.conf
+        sed -i /$VOL.conf/d  $CONF1
+        #If there are any other volumes exported, restart nfs-ganesha
+        if [ "$(ls -A /var/lib/ganesha/exports)" ];
+                then
+                check_nfsd_loc
+                $LOC/bin/ganesha.nfsd -f $CONF1 -L $LOG -N NIV_FULL_DEBUG -d
+        else
+                rm -rf /var/lib/ganesha/export_added
+        fi
+
+}
+
+        parse_args $@
+        if [ ! -d "/var/lib/ganesha/exports" ];
+                then
+                mkdir /var/lib/ganesha/exports
+        fi
+        if echo $enable_ganesha | grep -q -i "ON"
+                then
+                check_if_host_set $VOL
+                start_ganesha
+        elif echo $enable_ganesha | grep -q -i "OFF"
+                then
+                check_if_host_set
+                if [ "$IS_HOST_SET" = "YES" ]
+                        then
+                        stop_ganesha
+                fi
+        fi
+        if [ "$host_name" != "none" ];
+                then
+                check_if_host_set
+                set_hostname
+                         if  cat /var/lib/glusterd/vols/$VOL/info\
+| grep -i -q  "nfs-ganesha.enable=on"
+                                  then
+                                  start_ganesha
+                         fi
+        fi
+
+