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#!/bin/sh
# Copyright 2022 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: MIT
# shellcheck disable=SC2016 # Intentional quoting technique
set -u
ARCHITECTURE=$(dpkg --print-architecture)
IMAGE=rootfs.ext2
INCLUDE_PACKAGES=init
MIRROR="http://deb.debian.org/debian"
SIZE=$((1024*1024*1024))
SSHKEY=
SUITE=unstable
VMNAME=testvm
die() {
echo "$*" 1>&2
exit 1
}
usage() {
die "usage: $0 [-a architecture] [-h hostname] [-k sshkey] [-m mirror] [-o output] [-p packages] [-r release] [-s size_in_GB] [-- mmdebstrap options]"
}
while test "$#" -gt 0; do
case "$1" in
-a)
test "$#" -eq 1 && usage
ARCHITECTURE=$2
shift 2
;;
-h)
test "$#" -eq 1 && usage
VMNAME=$2
shift 2
;;
-k)
test "$#" -eq 1 && usage
SSHKEY=$2
shift 2
;;
-m)
test "$#" -eq 1 && usage
MIRROR=$2
shift 2
;;
-o)
test "$#" -eq 1 && usage
IMAGE=$2
shift 2
;;
-p)
test "$#" -eq 1 && usage
INCLUDE_PACKAGES="$INCLUDE_PACKAGES,$2"
shift 2
;;
-r)
test "$#" -eq 1 && usage
SUITE=$2
shift 2
;;
-s)
test "$#" -eq 1 && usage
SIZE=$(($2*1024*1024*1024))
shift 2
;;
--)
shift
break
;;
*)
usage
;;
esac
done
if test -n "$SSHKEY" && ! test -f "$SSHKEY"; then
die "error: ssh keyfile '$SSHKEY' not found"
fi
case "$SUITE" in
jessie)
DEBVER=8
;;
stretch)
DEBVER=9
;;
buster)
DEBVER=10
;;
bullseye|stable)
DEBVER=11
;;
bookworm|testing)
DEBVER=12
;;
trixie)
DEBVER=13
;;
forky)
DEBVER=14
;;
sid|unstable)
DEBVER=999
;;
*)
die "unrecognized Debian release: $SUITE"
;;
esac
KERNEL_SUFFIX=-$ARCHITECTURE
case "$ARCHITECTURE" in
amd64|arm64)
KERNEL_SUFFIX="-cloud-$ARCHITECTURE"
if test "$DEBVER" -le 9; then
KERNEL_SUFFIX="-$ARCHITECTURE"
fi
;;
armhf)
KERNEL_SUFFIX=-armmp
;;
i386)
KERNEL_SUFFIX=-686-pae
;;
mips64el)
KERNEL_SUFFIX=-5kc-malta
;;
mipsel)
KERNEL_SUFFIX=-4kc-malta
;;
ppc64el)
KERNEL_SUFFIX=-powerpc64le
;;
esac
INCLUDE_PACKAGES="$INCLUDE_PACKAGES,linux-image$KERNEL_SUFFIX"
if test -n "$SSHKEY"; then
INCLUDE_PACKAGES="$INCLUDE_PACKAGES,openssh-server"
fi
# add a DNS resolver
if test "$DEBVER" -ge 9; then
INCLUDE_PACKAGES="$INCLUDE_PACKAGES,libnss-resolve"
fi
if test "$DEBVER" -le 11; then
set -- '--customize-hook=chroot "$1" systemctl enable systemd-resolved.service' "$@"
fi
if test "$DEBVER" -le 9; then
set -- '--customize-hook=ln -fs ../run/systemd/resolve/resolv.conf "$1/etc/resolv.conf"' "$@"
elif test "$DEBVER" -le 11; then
set -- '--customize-hook=ln -fs ../run/systemd/resolve/stub-resolv.conf "$1/etc/resolv.conf"' "$@"
fi
# construct mmdebstrap options as $@:
set -- \
--verbose \
--variant=apt \
--format=ext2 \
"--architecture=$ARCHITECTURE" \
"--include=$INCLUDE_PACKAGES" \
'--customize-hook=echo "LABEL=debvm / ext4 defaults 0 1" >"$1/etc/fstab"' \
"$@"
# set up a hostname
set -- \
"--customize-hook=echo $VMNAME >"'"$1/etc/hostname"' \
"--customize-hook=echo 127.0.0.1 localhost $VMNAME >"'"$1/etc/hosts"' \
"$@"
# allow password-less root login
set -- '--customize-hook=chroot "$1" passwd --delete root' "$@"
# dhcp on all network interfaces
SYSD_NET_MATCH='Name=en*\n'
test "$DEBVER" -le 8 && SYSD_NET_MATCH="${SYSD_NET_MATCH}Name=eth*\\n"
SYSD_NET_NET='DHCP=yes\n'
# This anchor is included by default since bullseye. Fails DNSSEC validation when missing.
test "$DEBVER" -le 11 && SYSD_NET_NET="${SYSD_NET_NET}DNSSECNegativeTrustAnchors=home.arpa\\n"
set -- \
'--customize-hook=chroot "$1" systemctl enable systemd-networkd.service' \
"--customize-hook=printf \"[Match]\\n$SYSD_NET_MATCH\\n[Network]\\n$SYSD_NET_NET"'\n[DHCP]\nUseDomains=yes\n" > "$1/etc/systemd/network/20-wired.network"' \
"$@"
# add ssh key for root
if test -n "$SSHKEY"; then
set -- \
'--customize-hook=mkdir -p "$1/root/.ssh"' \
"--customize-hook=upload $SSHKEY /root/.ssh/authorized_keys" \
"$@"
fi
set -- --skip=cleanup/apt "$@"
# We need /var/lib/dpkg/available for dpkg --set-selections to work.
set -- '--customize-hook=chroot "$1" apt-cache dumpavail | chroot "$1" dpkg --update-avail' "$@"
if test "$DEBVER" -le 8; then
# Use obsolete and expired keys.
set -- '--keyring=/usr/share/keyrings/debian-archive-removed-keys.gpg' "$@"
set -- --aptopt='Apt::Key::gpgvcommand "/usr/libexec/mmdebstrap/gpgvnoexpkeysig"' "$@"
# chfn does not work, because libpam-runtime.postinst is late setting up /etc/pam.d/common-auth et al, see #1026765
set -- --extract-hook='chroot "$1" pam-auth-update --package --force' "$@"
fi
if test "$DEBVER" -ge 12; then
# Avoid the usrmerge package
set -- --hook-dir=/usr/share/mmdebstrap/hooks/merged-usr "$@"
fi
# suite target mirror
set -- "$@" "$SUITE" "$IMAGE" "deb $MIRROR $SUITE main"
set -ex
mmdebstrap "$@"
truncate -s "$SIZE" "$IMAGE"
/sbin/resize2fs "$IMAGE"
/sbin/tune2fs -L debvm -i 0 -O extents,uninit_bg,dir_index,has_journal "$IMAGE"
# Must fsck after tune2fs: https://ext4.wiki.kernel.org/index.php/UpgradeToExt4
/sbin/fsck.ext4 -fDp rootfs.ext2
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