44 lines
1.1 KiB
Bash
Executable file
44 lines
1.1 KiB
Bash
Executable file
#!/usr/bin/bash
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# Rebase one level down
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set -eu
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# if less than one arguments supplied, display usage
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if [ $# -ne 1 ]
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then
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echo "This script takes as input the name of the VM to rebase one level down"
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echo "Usage: $0 vm_name"
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exit 1
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fi
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VM_NAME=$1
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if [ ! -f $VM_NAME.qcow2 ]
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then
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echo "File not found $VM_NAME.qcow2"
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exit 1
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fi
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shopt -s lastpipe
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qemu-img info --backing-chain $VM_NAME.qcow2 | grep image | wc -l | read NUMBASES
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qemu-img info --backing-chain $VM_NAME.qcow2 | grep image | head -n 3 | tail -n 1 | cut -d' ' -f2 | read NEWBASE
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qemu-img info --backing-chain $VM_NAME.qcow2 | grep image | head -n 2 | tail -n 1 | cut -d' ' -f2 | read CURRENTBASE
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if [ ! $NUMBASES -ge 3 ]
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then
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echo "Image must have at least 2 backing-files"
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exit 1
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fi
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if [ ! -f $NEWBASE -a -f $CURRENTBASE ]
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then
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echo "Backingfiles not found $CURRENTBASE, $NEWBASE"
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exit 1
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fi
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qemu-img rebase -f qcow2 -b $NEWBASE -F qcow2 $VM_NAME.qcow2
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rm $CURRENTBASE
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mv $VM_NAME.qcow2 $CURRENTBASE
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chmod a-w $CURRENTBASE
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qemu-img create -f qcow2 -F qcow2 -b $CURRENTBASE $VM_NAME.qcow2
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