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#!/bin/sh
# Generate an initramfs image, much like mkinitramfs(8) but simpler
#
# Copyright © 2021-2022 Guilhem Moulin <guilhem@debian.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -eu
PATH="/usr/sbin:/usr/bin:/sbin:/bin"
export PATH
unset DEBUG
EXTRACT_DIR="$1"
KERNEL_VERSION="$2"
INITRD="$3"
UTILS="$(dirname -- "$0")"
DESTDIR="$(mktemp --directory -- "$INITRD.XXXXXXXXXX")"
trap "rm -r${DEBUG:+v}f -- \"$DESTDIR\"" EXIT INT TERM
# from /usr/sbin/mkinitramfs: create usr-merged filesystem layout, to
# avoid duplicates if the host filesystem is usr-merged
for d in /bin /lib* /sbin; do
[ -d "$d" ] || continue
mkdir -p "$DESTDIR/usr$d"
ln -sT "usr$d" "$DESTDIR$d"
done
install -m0755 "$UTILS/init" "$DESTDIR/init"
install -m0755 "$UTILS/debootstrap" "$DESTDIR/debootstrap"
cat >"$DESTDIR/init.conf" <<- EOF
HOSTNAME="$TESTNAME"
export HOSTNAME
PACKAGES="$PACKAGES"
BOOT="$BOOT"
CONSOLE="$CONSOLE"
ARCH="$ARCH"
MERGED_USR="$MERGED_USR"
EOF
for p in setup preinst postinst bottom; do
# setup: sourced after creating the BIOS or EFI boot partition
# preinst: run in chroot after debootstrap, but before installing extra packages
# postinst: optionally run in chroot after installing extra packages
# bottom: last thing to run before shutdown
if [ -f "$TESTDIR/$TESTNAME.d/$p" ]; then
install -m0755 "$TESTDIR/$TESTNAME.d/$p" "$DESTDIR/init.$p"
fi
done
MODULES="dm_crypt ext4 btrfs raid0 raid1"
if [ "$BOOT" = "efi" ]; then
MODULES="$MODULES efivarfs nls_ascii nls_cp437 vfat"
fi
depmod -ab "$EXTRACT_DIR" "$KERNEL_VERSION"
for kmod in virtio_console virtio_blk virtio_pci virtio_rng \
"$EXTRACT_DIR/lib/modules/$KERNEL_VERSION"/kernel/arch/*/crypto/*.ko* \
"$EXTRACT_DIR/lib/modules/$KERNEL_VERSION"/kernel/crypto/*.ko* \
$MODULES; do
kmod="${kmod##*/}"
modprobe -aid "$EXTRACT_DIR" -S "$KERNEL_VERSION" --show-depends "${kmod%%.*}"
done | while read -r insmod kmod _; do
[ "$insmod" = "insmod" ] || continue
kmod_rel="${kmod#"$EXTRACT_DIR/lib/modules/$KERNEL_VERSION/"}"
if [ ! -f "$kmod" ] || [ "${kmod_rel#kernel/}" = "$kmod_rel" ]; then
echo "Error: Unexpected modprobe output: $insmod $kmod" >&2
exit 1
fi
mkdir -p "$DESTDIR/lib/modules/$KERNEL_VERSION/${kmod_rel%/*}"
ln -f${DEBUG:+v}T -- "$kmod" "$DESTDIR/lib/modules/$KERNEL_VERSION/$kmod_rel"
done
ln -t "$DESTDIR/lib/modules/$KERNEL_VERSION" -- \
"$EXTRACT_DIR/lib/modules/$KERNEL_VERSION/modules.order" \
"$EXTRACT_DIR/lib/modules/$KERNEL_VERSION/modules.builtin"
depmod -wab "$DESTDIR" "$KERNEL_VERSION"
verbose="${DEBUG-}"
. /usr/share/initramfs-tools/hook-functions # for copy_exec()
if [ -f "$TESTDIR/$TESTNAME.d/mkinitramfs" ]; then
. "$TESTDIR/$TESTNAME.d/mkinitramfs"
fi
copy_exec /bin/cp
copy_exec /bin/rm
copy_exec /bin/chmod
copy_exec /sbin/modprobe
copy_exec /sbin/blkid
copy_exec /sbin/sfdisk
copy_exec /sbin/mkswap
copy_exec /sbin/swapon
copy_exec /sbin/swapoff
copy_exec /sbin/cryptsetup
copy_exec /sbin/dmsetup
copy_exec /usr/bin/dpkg-deb
copy_exec /bin/tar
# assume ossl-modules/legacy.so is relative to the linked libcryptsetup.so
libdir="$(env --unset=LD_PRELOAD ldd /sbin/cryptsetup | sed -nr '/.*=>\s*(\S+)\/libcryptsetup\.so\..*/ {s//\1/p;q}')"
copy_exec "$libdir/ossl-modules/legacy.so" || true
for p in /sbin/cryptsetup /sbin/lvm /sbin/mdadm /sbin/mke2fs /sbin/mkfs.btrfs /bin/btrfs; do
if [ -x "$p" ]; then
copy_exec "$p"
fi
done
if [ "$BOOT" = "efi" ]; then
if [ ! -x "/sbin/mkfs.vfat" ]; then
echo "Couldn't find mkfs.vfat, is the 'dosfstools' package installed?" >&2
exit 1
fi
copy_exec /sbin/mkfs.vfat
fi
cp -pLt "$DESTDIR/lib" /lib/klibc-*.so
for cmd in cat chroot ln ls mkdir mount mv sh umount uname; do
exe="/usr/lib/klibc/bin/$cmd"
if [ ! -f "$exe" ] || [ ! -x "$exe" ]; then
echo "No such executable: $exe" >&2
exit 1
fi
copy_exec "$exe" /bin
done
# copy udevd and (some of) its rules
copy_exec /lib/systemd/systemd-udevd
copy_exec /bin/udevadm
mkdir -p -- "$DESTDIR/etc/udev" "$DESTDIR/lib/udev/rules.d"
cat >"$DESTDIR/etc/udev/udev.conf" <<-EOF
udev_log=info
resolve_names=never
EOF
for rules in 50-udev-default.rules 55-dm.rules 60-block.rules \
60-persistent-storage.rules 60-persistent-storage-dm.rules \
63-md-raid-arrays.rules 95-dm-notify.rules; do
if [ -e "/lib/udev/rules.d/$rules" ]; then
cp -T "/lib/udev/rules.d/$rules" "$DESTDIR/lib/udev/rules.d/$rules"
fi
done
cd "$DESTDIR"
find . -print0 | cpio -o0 -R 0:0 -H newc --quiet ${DEBUG:+--verbose} >"$INITRD"
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