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#!/bin/bash
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function usage {
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echo "Syntax :" 1>&2
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echo "$0 [options]" 1>&2
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echo " -n : filesystem name" 1>&2
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echo " -p : pool name" 1>&2
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echo " -o : options zfs filesystem. Read the man zfs for more details" 1>&2
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}
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function nointeractive {
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/sbin/zfs create -o $FS_OPTION $NAME_POOL/$NAME
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}
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function interactive {
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zfs list
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echo "*** Choose a pool for the filesystem to create : ***"
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while read inputline
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do
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   if [ "$inputline" != "" ]
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   then
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      zfs list |grep -i $inputline
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      if [ $? -eq 1 ]
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      then
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         echo "*** Choose a pool for the filesystem to create : ***"
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      else
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         echo "*** Are you sur : $inputline ? (y/n) ***"
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         while read inputConfirm
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         do
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            if [ "$inputConfirm" = "y" ]||[ "$inputConfirm" = "n" ]
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            then
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              break
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            fi
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            echo "*** Are you sur : $inputline ? (y/n) ***"
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         done
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          if [ "$inputConfirm" = "y" ]
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          then
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             NAME_POOL=$inputline
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             echo "filesystem name : "
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             while read inputFS
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             do
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                if [ "$inputFS" != "" ]
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                then
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                   zfs list |grep -i "$inputFS "
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                   if [ $? -eq 0 ]
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                   then
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                         echo "Filesystem name already exists"
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                         FS_OK=1
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                   else
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                      FS_OK=0
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                   fi
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                   if [ $FS_OK -eq 1 ]
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                   then
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                      echo "filesystem name : "
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                   else
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                      NAME_FS=$inputFS
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                           zfs create $NAME_POOL/$inputFS
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                           if [ $? -eq 0 ]
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                           then
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                              echo "*** ZFS filesystem Creation [OK] ***"
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                              zfs list
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                              break
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                           else
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                              echo "/!\\ ZFS filesystem Creation [ERROR] /!\\"
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                           fi
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                    fi
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                else
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                  echo "filesystem name : "
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                fi
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             done
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             break
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          fi
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          break
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      fi
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   else
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      echo "*** Choose a pool for the filesystem to create : ***"
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   fi
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done
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}
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while getopts "in:p:b:s:o:h" OPTION
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do
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     case $OPTION in
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         h)
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             usage
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             exit 1
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             ;;
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         i)
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            interactive
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            exit 0
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            ;;
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         n)
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           NAME=$OPTARG
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           ;;
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         p)
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           NAME_POOL=$OPTARG
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           ;;
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         o)
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           FS_OPTION=$OPTARG
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           FS_OPTION=$(echo $FS_OPTION|sed -e 's/,/ -o /g')
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           echo "$FS_OPTION"
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           ;;
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    esac
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done
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if [[ -z $NAME_POOL ]] || [[ -z $NAME ]]
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then
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     usage
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     exit 1
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fi
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nointeractive