79 lines
1.9 KiB
Bash
Executable file
79 lines
1.9 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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show_help() {
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cat << EOF
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Usage: $(basename "$0") [-n newname] vmname"
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This script takes as input the name of the VM to rebase one level down
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-n new name of the rebased image
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EOF
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}
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while getopts ':n:' OPTION; do
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case "$OPTION" in
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n)
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NEWNAME=$OPTARG
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;;
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?)
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show_help
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exit 1
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;;
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esac
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done
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shift "$((OPTIND -1))"
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# if less or more than one arguments supplied, display usage
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if [[ $# -ne 1 ]]; then
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show_help
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exit 1
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fi
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# change to Images directory
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cd /var/lib/libvirt/images
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VM_NAME="$1"
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# check if VM-Diskimage exists
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if [[ ! -f "${VM_NAME}.qcow2" ]]; then
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echo "File not found ${VM_NAME}.qcow2"
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exit 1
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fi
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# check if new VM-Diskimage exists
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if [[ -v NEWNAME ]] && [[ -f "${NEWNAME}.qcow2" ]]; then
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echo "New Base already exists: ${NEWNAME}.qcow2"
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exit 1
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fi
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NUMBASES=$(qemu-img info --backing-chain "${VM_NAME}.qcow2" | grep -c image)
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NEWBASE=$(qemu-img info --backing-chain "${VM_NAME}.qcow2" | grep image | head -n 3 | tail -n 1 | cut -d' ' -f2)
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CURRENTBASE=$(qemu-img info --backing-chain "${VM_NAME}.qcow2" | grep image | head -n 2 | tail -n 1 | cut -d' ' -f2)
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if [[ ! "${NUMBASES}" -ge 3 ]]; 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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# check if base Diskimage exists
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if [[ ! -f "${NEWBASE}" ]] || [[ ! -f "${CURRENTBASE}" ]]; then
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echo "Backingfiles not found ${CURRENTBASE}, ${NEWBASE}"
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exit 1
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fi
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# rebasing disk image
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qemu-img rebase -f qcow2 -b "${NEWBASE}" -F qcow2 "${VM_NAME}.qcow2"
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if [[ -v NEWNAME ]]; then
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# copy and adapt machine definition file
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CURRENTNAME="${CURRENTBASE/.qcow2/}"
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cp "xml/${CURRENTNAME}.xml" "xml/${NEWNAME}.xml"
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sed -i "s/${CURRENTNAME}/${NEWNAME}/" "xml/${NEWNAME}.xml"
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NEWNAME="${NEWNAME}.qcow2"
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else
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rm "${CURRENTBASE}"
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NEWNAME="${CURRENTBASE}"
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fi
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mv "${VM_NAME}.qcow2" "${NEWNAME}"
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chmod a-w "${NEWNAME}"
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