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#!/usr/bin/env bash
set -euo pipefail
# Libvirt context (system)
URI="qemu:///system"
# Base/template (immutable parent qcow2)
BASE="/var/lib/libvirt/images/base/debian13-template.qcow2"
TEMPLATE_DOMAIN="debian13-template"
# Lab overlays directory (dedicated)
LABDIR="/var/lib/libvirt/images/lab"
usage() {
echo "Usage: kvm-lab-create <lab-name> [--start]"
echo "Example: kvm-lab-create lab02 --start"
}
NAME="${1:-}"
START="${2:-}"
if [[ -z "$NAME" ]]; then
usage
exit 1
fi
if [[ "${START:-}" != "" && "${START:-}" != "--start" ]]; then
usage
exit 1
fi
DISK="${LABDIR}/${NAME}.qcow2"
XML_TMP="$(mktemp "/tmp/${NAME}.xml.XXXXXX")"
cleanup() { rm -f "$XML_TMP"; }
trap cleanup EXIT
# ---- Preconditions (read-only checks) ----
if ! sudo test -r "$BASE"; then
echo "ERROR: Base image not readable: $BASE"
exit 1
fi
if [[ ! -d "$LABDIR" ]]; then
echo "ERROR: Lab directory missing: $LABDIR"
exit 1
fi
if [[ -e "$DISK" ]]; then
echo "ERROR: Disk already exists: $DISK"
exit 1
fi
if virsh -c "$URI" dominfo "$NAME" &>/dev/null; then
echo "ERROR: Domain already exists: $NAME"
exit 1
fi
if ! virsh -c "$URI" dominfo "$TEMPLATE_DOMAIN" &>/dev/null; then
echo "ERROR: Template domain not found in $URI: $TEMPLATE_DOMAIN"
exit 1
fi
# ---- Create overlay disk ----
echo "Creating overlay disk: $DISK"
sudo qemu-img create -f qcow2 -F qcow2 -b "$BASE" "$DISK" >/dev/null
# Ensure qemu/libvirt can open it
sudo chown libvirt-qemu:libvirt "$DISK"
sudo chmod 0660 "$DISK"
# Quick sanity: confirm backing file is correct
echo "Validating backing file..."
sudo qemu-img info "$DISK" | grep -E "backing file:|file format:|virtual size:" || true
# ---- Clone domain XML ----
echo "Cloning domain XML from: $TEMPLATE_DOMAIN"
virsh -c "$URI" dumpxml "$TEMPLATE_DOMAIN" > "$XML_TMP"
# Replace <name> and the disk path, and force NAT-only network "default"
# Notes:
# - disk path substitution assumes template points at /var/lib/libvirt/images/base/debian13-template.qcow2
# - network replacement assumes a standard <interface type='network'> exists
sed -i \
-e "s|<name>${TEMPLATE_DOMAIN}</name>|<name>${NAME}</name>|" \
-e "s|${BASE}|${DISK}|g" \
-e "s|<source network='[^']*'|<source network='default'|g" \
"$XML_TMP"
# Extra safety: remove any hostfs passthrough (if any) to prevent host access via mounts
# (If none exist, this does nothing.)
perl -0777 -i -pe 's/<filesystem[\s\S]*?<\/filesystem>\n?//g' "$XML_TMP"
#
# Remove UUID to avoid collision with template
sed -i -E '/<uuid>[^<]*<\/uuid>/d' "$XML_TMP"
# ---- Define domain ----
echo "Defining domain: $NAME"
virsh -c "$URI" define "$XML_TMP" >/dev/null
# ---- Optional start ----
if [[ "$START" == "--start" ]]; then
echo "Starting domain: $NAME"
virsh -c "$URI" start "$NAME" >/dev/null
fi
echo "OK: Lab '${NAME}' created (disk: ${DISK})."
if [[ "$START" != "--start" ]]; then
echo "To start: virsh -c $URI start ${NAME}"
fi
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