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#!/usr/bin/env bash
set -euo pipefail
URI="qemu:///system"
IMGROOT="/var/lib/libvirt/images"
BASEDIR="$IMGROOT/base"
SNAPROOT="$HOME/.backup/kvm-labs"
usage() {
echo "Usage: kvm-promote-to-base <vm-name> [--disk vda]"
echo "Creates: $BASEDIR/<vm-name>-base-YYYY-MM-DD_HHMMSS.qcow2"
exit 1
}
VM="${1:-}"
DISKTGT="vda"
shift || true
while [[ $# -gt 0 ]]; do
case "$1" in
--disk)
DISKTGT="${2:-}"
shift 2
;;
-h|--help)
usage
;;
*)
echo "ERROR: Unknown arg: $1"
usage
;;
esac
done
if [[ -z "$VM" ]]; then
usage
fi
if [[ ! -d "$BASEDIR" ]]; then
echo "ERROR: Base directory missing: $BASEDIR"
exit 1
fi
state="$(virsh -c "$URI" domstate "$VM" 2>/dev/null | tr -d '\r' || true)"
if [[ "$state" != "shut off" ]]; then
echo "ERROR: VM must be shut off for consistent promotion."
echo "VM: $VM"
echo "State: ${state:-unknown}"
exit 1
fi
DISK="$(virsh -c "$URI" domblklist "$VM" --details | awk -v t="$DISKTGT" '$3==t{print $4}')"
if [[ -z "$DISK" || ! -f "$DISK" ]]; then
echo "ERROR: Cannot locate disk for $VM target=$DISKTGT"
echo "Detected: '$DISK'"
exit 1
fi
TS="$(date +%F_%H%M%S)"
SNAPDIR="$SNAPROOT/${TS}-promote-${VM}"
NEWBASE="$BASEDIR/${VM}-base-${TS}.qcow2"
mkdir -p "$SNAPDIR"
# Snapshot metadata (read-only)
virsh -c "$URI" dumpxml "$VM" > "$SNAPDIR/${VM}.xml"
sudo qemu-img info --backing-chain "$DISK" > "$SNAPDIR/${VM}.${DISKTGT}.backing-chain.txt" || true
sudo ls -l "$DISK" > "$SNAPDIR/${VM}.${DISKTGT}.ls.txt" || true
echo "Creating base image:"
echo " VM: $VM"
echo " Disk: $DISK (target: $DISKTGT)"
echo " Target: $NEWBASE"
sudo qemu-img convert -O qcow2 "$DISK" "$NEWBASE"
sudo chown libvirt-qemu:libvirt "$NEWBASE"
sudo chmod 0660 "$NEWBASE"
echo "Verifying new base has no backing file..."
if sudo qemu-img info "$NEWBASE" | grep -q '^backing file:'; then
echo "ERROR: New base unexpectedly has a backing file. Aborting."
exit 1
fi
echo "SUCCESS: $NEWBASE"
echo "Snapshot: $SNAPDIR"
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