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175 lines
3.3 KiB
Bash
Executable File
175 lines
3.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# $Id: createvm.sh 9132 2010-06-04 20:17:43Z manuel $ $HeadURL: svn://svn.lab.vmops.com/repos/vmdev/java/scripts/storage/zfs/nfs/createvm.sh $
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# createvm.sh -- create a vm image directory by cloning
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#
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usage() {
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printf "Usage: %s: -t <template-fs> -d <disk-fs> -i <instance-fs> -u <user fs>\n" $(basename $0) >&2
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}
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#ensure that the instance fs is mounted within the user fs
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check_valid_userfs() {
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local ifs=$1
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local ufs=$2
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local child=${ifs#$ufs}
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if [ ${#child} -eq $(( ${#ifs}-${#ufs} )) ]
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then
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return 0
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else
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printf "instance fs $ifs is not contained within user fs $ufs. Bailing\n" >&2
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exit 3;
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fi
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}
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get_latest_snapshot() {
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local fs=$1
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snap=$(zfs list -r -H -o name -S creation -t snapshot $fs| head -1)
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if [ -z $snap ]
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then
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return 1
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fi
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echo $snap
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return 0
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}
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clone_contained_datadisks() {
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local templatefs=$1
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local instancefs=$2
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for diskfs in $(find /$templatefs -type d | grep datadisk)
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do
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diskfs=${diskfs:1} #strip out leading slash
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disksnap=$(get_latest_snapshot $diskfs)
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if [ -z $disksnap ]
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then
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printf "No snapshots exist of disk filesystem $diskfs..bailing\n" >&2
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return 6
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fi
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disk=$(basename $disksnap | cut -f1 -d'@')
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disk="$instancefs/$disk"
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printf "Cloning datadisk $disksnap to $disk\n" >&2
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zfs clone $disksnap $disk
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#printf "disksnap=$disksnap target=$disk\n"
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if [ $? -gt 0 ]
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then
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printf "Failed to clone datadisk $disksnap\n" >&2
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return 7
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fi
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done
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}
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#set -x
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tflag=
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iflag=
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uflag=
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dflag=
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while getopts 't:i:u:d:' OPTION
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do
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case $OPTION in
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t) tflag=1
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templatefs="$OPTARG"
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;;
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i) iflag=1
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instancefs="$OPTARG"
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;;
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u) uflag=1
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userfs="$OPTARG"
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;;
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d) dflag=1
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diskfs="$OPTARG"
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;;
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?) usage
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exit 2
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;;
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esac
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done
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if [ "$tflag$iflag$uflag" != "111" ]
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then
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usage
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exit 2
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fi
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#if user has provided leading slash, strip it out
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if [ ${userfs:0:1} == / ]
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then
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userfs=${userfs:1}
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fi
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if [ ${templatefs:0:1} == / ]
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then
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templatefs=${templatefs:1}
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fi
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if [ ${instancefs:0:1} == / ]
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then
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instancefs=${instancefs:1}
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fi
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if [ -n "$diskfs" ]
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then
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if [ ${diskfs:0:1} == / ]
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then
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diskfs=${diskfs:1}
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fi
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fi
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check_valid_userfs $instancefs $userfs
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#if userfs doesn't exist, create it
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if [ ! -d /$userfs ]
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then
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zfs create $userfs
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if [ $? -gt 0 ]
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then
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printf "Failed to create user fs $userfs\n" >&2
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exit 5
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fi
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fi
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#if user has provided the exact snapshot of the template fs, use it,
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#else get the latest snapshot
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tsnap=$(echo $templatefs | cut -f2 -d'@')
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if [ $tsnap == $templatefs ]
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then
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tsnap=$(get_latest_snapshot $templatefs)
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if [ -z $tsnap ]
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then
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printf "No snapshots exist of filesystem $templatefs..bailing\n" >&2
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exit 4
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fi
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else
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tsnap=$templatefs
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templatefs=$(echo $templatefs | cut -f1 -d'@') #strip out snap version
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fi
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if [ -n "$diskfs" ]
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then
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disksnap=$(get_latest_snapshot $diskfs)
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if [ -z $disksnap ]
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then
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printf "No snapshots exist of disk filesystem $diskfs..bailing\n" >&2
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exit 6
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fi
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fi
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#Clone root disk and associated files
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printf "Cloning root disk $tsnap to $instancefs\n" >&2
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zfs clone $tsnap $instancefs
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if [ $? -gt 0 ]
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then
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printf "Failed to clone root disk $snap\n" >&2
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exit 5
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fi
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#Clone datadisk
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if [ -n "$diskfs" ]
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then
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zfs clone $disksnap $instancefs/datadisk1
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else
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clone_contained_datadisks $templatefs $instancefs
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fi
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exit 0
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