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Replace disk in the specified VM template in Proxmox with the given image.
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#!/bin/sh | |
# SPDX-FileCopyrightText: 2023 Jakub Jirutka <jakub@jirutka.cz> | |
# SPDX-License-Identifier: MIT | |
set -eu | |
PROGNAME='qm-replace-disk' | |
VERSION='0.1.0' | |
# Defaults | |
DISK='scsi0' | |
die() { | |
printf "$PROGNAME: %s\n" "$@" >&2 | |
exit 2 | |
} | |
help() { | |
cat <<-EOF | |
Usage: $PROGNAME [options] <vmid> <image> | |
Replace disk in the specified VM template in Proxmox with the given image. | |
Arguments: | |
<vmid> ID of the VM template. | |
<image> Path to the image file to import or "-" for stdin. | |
Options: | |
-d --disk <diskid> The disk to replace (default is "$DISK"). | |
-V --version Show script name & version and exit. | |
-h --help Show this message and exit. | |
EOF | |
} | |
parse_args() { | |
local opts | |
opts="$(getopt -n $PROGNAME -o d:hV -l disk:,help,version -- "$@")" || exit 1 | |
eval set -- "$opts" | |
while [ $# -gt 0 ]; do | |
case "$1" in | |
-d | --disk) DISK=$2;; | |
-h | --help) help; exit 0;; | |
-V | --version) echo "$PROGNAME $VERSION"; exit 0;; | |
--) shift; break;; | |
esac | |
shift 2 | |
done | |
[ $# -eq 2 ] || die 'invalid number of arguments (try --help)' | |
VMID=$1 | |
IMAGE_FILE=$2 | |
} | |
parse_args "$@" | |
if [ "$(id -u)" -ne 0 ]; then | |
echo 'Re-executing as root' | |
exec sudo -u root "$0" "$@" | |
fi | |
config=$(qm config "$VMID") || exit 2 | |
if ! echo "$config" | grep -qFx 'template: 1'; then | |
die "VM $VMID is not a template!" >&2 | |
fi | |
# Example: "scsi0: zfs_main:vm-1317-disk-1,iothread=1,size=5G". | |
storageid=$(echo "$config" | sed -En "s/^$DISK: ([^:]+).*/\1/p") | |
[ "$storageid" ] || die "VM $VMID does not have disk $DISK!" | |
diskopts="$(echo "$config" \ | |
| sed -En "s/^$DISK: [^,]+,?(.*)/\1/p" \ | |
| tr ',' '\n' \ | |
| grep -v '^size=' \ | |
| tr '\n' ',')" | |
diskopts="${diskopts%,}" | |
tmpfile= | |
if [ "$IMAGE_FILE" = '-' ]; then | |
printf 'Reading image from stdin...' | |
tmpfile="$(mktemp -t -p /var/tmp "$PROGNAME.XXXXXX")" | |
IMAGE_FILE="$tmpfile" | |
cat > "$tmpfile" | |
size=$(stat -c %s "$IMAGE_FILE") | |
echo " $(( $size >>20 )) MiB done." >&2 | |
fi | |
[ -f "$IMAGE_FILE" ] || die "File $IMAGE_FILE does not exist or not readable!" | |
qm set "$VMID" -$DISK "$storageid:0,$diskopts,import-from=$IMAGE_FILE" | |
[ -f "$tmpfile" ] && rm "$tmpfile" | |
unused="$(qm config "$VMID" | grep -o '^unused[0-9]' | tail -n1)" | |
[ "$unused" ] && qm disk unlink "$VMID" --idlist "$unused" | |
exit 0 |
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