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#!/bin/ash
#
# SPDX-License-Identifier: GPL-3.0-or-later
# args: source, newroot, mountpoint
_mnt_dmsnapshot() {
local img="${1}"
local newroot="${2}"
local mnt="${3}"
local img_fullname="${img##*/}";
local img_name="${img_fullname%%.*}"
local dm_snap_name="${dm_snap_prefix}_${img_name}"
local ro_dev ro_dev_size rw_dev
ro_dev="$(losetup --find --show --read-only -- "${img}")"
echo "${ro_dev}" >> /run/parabolaiso/used_block_devices
ro_dev_size="$(blockdev --getsz "${ro_dev}")"
if [ "${cow_persistent}" = "P" ]; then
if [ -f "/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow" ]; then
msg ":: Found '/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow', using as persistent."
else
msg ":: Creating '/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow' as persistent."
truncate -s "${cow_spacesize}" "/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow"
fi
else
if [ -f "/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow" ]; then
msg ":: Found '/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow' but non-persistent requested, removing."
rm -f "/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow"
fi
msg ":: Creating '/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow' as non-persistent."
truncate -s "${cow_spacesize}" "/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow"
fi
rw_dev="$(losetup --find --show "/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow")"
echo "${rw_dev}" >> /run/parabolaiso/used_block_devices
dmsetup create "${dm_snap_name}" --table \
"0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} ${cow_chunksize}"
if [ "${cow_persistent}" != "P" ]; then
rm -f "/run/parabolaiso/cowspace/${cow_directory}/${img_name}.cow"
fi
_mnt_dev "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" "-w" "defaults"
readlink -f "/dev/mapper/${dm_snap_name}" >> /run/parabolaiso/used_block_devices
}
# args: source, newroot, mountpoint
_mnt_overlayfs() {
local src="${1}"
local newroot="${2}"
local mnt="${3}"
mkdir -p "/run/parabolaiso/cowspace/${cow_directory}/upperdir" "/run/parabolaiso/cowspace/${cow_directory}/workdir"
mount -t overlay -o \
"lowerdir=${src},upperdir=/run/parabolaiso/cowspace/${cow_directory}/upperdir,workdir=/run/parabolaiso/cowspace/${cow_directory}/workdir" \
airootfs "${newroot}${mnt}"
}
# args: /path/to/image_file, mountpoint
_mnt_sfs() {
local img="${1}"
local mnt="${2}"
local img_fullname="${img##*/}"
local sfs_dev
# shellcheck disable=SC2154
# defined via initcpio's parse_cmdline()
if [ "${copytoram}" = "y" ]; then
msg -n ":: Copying squashfs image to RAM..."
# in case we have pv use it to display copy progress feedback otherwise
# fallback to using plain cp
if command -v pv > /dev/null 2>&1; then
echo ""
(pv "${img}" > "/run/parabolaiso/copytoram/${img_fullname}")
local rc=$?
else
(cp -- "${img}" "/run/parabolaiso/copytoram/${img_fullname}")
local rc=$?
fi
if [ $rc != 0 ]; then
echo "ERROR: while copy '${img}' to '/run/parabolaiso/copytoram/${img_fullname}'"
launch_interactive_shell
fi
img="/run/parabolaiso/copytoram/${img_fullname}"
msg "done."
fi
sfs_dev="$(losetup --find --show --read-only -- "${img}")"
echo "${sfs_dev}" >> /run/parabolaiso/used_block_devices
_mnt_dev "${sfs_dev}" "${mnt}" "-r" "defaults"
}
# args: /path/to/image_file, mountpoint
_mnt_erofs() {
local img="${1}"
local mnt="${2}"
local img_fullname="${img##*/}"
local erofs_dev
# shellcheck disable=SC2154
# defined via initcpio's parse_cmdline()
if [ "${copytoram}" = "y" ]; then
msg -n ":: Copying EROFS image to RAM..."
if ! cp -- "${img}" "/run/parabolaiso/copytoram/${img_fullname}" ; then
echo "ERROR: while copy '${img}' to '/run/parabolaiso/copytoram/${img_fullname}'"
launch_interactive_shell
fi
img="/run/parabolaiso/copytoram/${img_fullname}"
msg "done."
fi
erofs_dev="$(losetup --find --show --read-only -- "${img}")"
echo "${erofs_dev}" >> /run/parabolaiso/used_block_devices
_mnt_dev "${erofs_dev}" "${mnt}" "-r" "defaults" "erofs"
}
# args: device, mountpoint, flags, opts
_mnt_dev() {
local dev="${1}"
local mnt="${2}"
local flg="${3}"
local opts="${4}"
local fstype="${5:-auto}"
mkdir -p "${mnt}"
msg ":: Mounting '${dev}' to '${mnt}'"
while ! poll_device "${dev}" 30; do
echo "ERROR: '${dev}' device did not show up after 30 seconds..."
echo " Falling back to interactive prompt"
echo " You can try to fix the problem manually, log out when you are finished"
launch_interactive_shell
done
if mount -t "${fstype}" -o "${opts}" "${flg}" "${dev}" "${mnt}"; then
msg ":: Device '${dev}' mounted successfully."
else
echo "ERROR; Failed to mount '${dev}'"
echo " Falling back to interactive prompt"
echo " You can try to fix the problem manually, log out when you are finished"
launch_interactive_shell
fi
}
_verify_checksum() {
local _status
cd "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}" || exit 1
sha512sum -c airootfs.sha512 > /tmp/checksum.log 2>&1
_status=$?
cd -- "${OLDPWD}" || exit 1
return "${_status}"
}
_verify_signature() {
local _status
local sigfile="${1}"
cd "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}" || exit 1
gpg --homedir /gpg --status-fd 1 --verify "${sigfile}" 2>/dev/null | grep -qE '^\[GNUPG:\] GOODSIG'
_status=$?
cd -- "${OLDPWD}" || exit 1
return ${_status}
}
run_hook() {
[ -z "${arch}" ] && arch="$(uname -m)"
[ -z "${copytoram_size}" ] && copytoram_size="75%"
[ -z "${parabolaisobasedir}" ] && parabolaisobasedir="parabola"
[ -z "${dm_snap_prefix}" ] && dm_snap_prefix="parabola"
# shellcheck disable=SC2154
# defined via initcpio's parse_cmdline()
[ -z "${parabolaisodevice}" ] && parabolaisodevice="/dev/disk/by-label/${parabolaisolabel}"
[ -z "${cow_spacesize}" ] && cow_spacesize="256M"
# shellcheck disable=SC2154
# defined via initcpio's parse_cmdline()
if [ -n "${cow_label}" ]; then
cow_device="/dev/disk/by-label/${cow_label}"
[ -z "${cow_persistent}" ] && cow_persistent="P"
elif [ -n "${cow_device}" ]; then
[ -z "${cow_persistent}" ] && cow_persistent="P"
else
cow_persistent="N"
fi
[ -z "${cow_flags}" ] && cow_flags="defaults"
[ -z "${cow_directory}" ] && cow_directory="persistent_${parabolaisolabel}/${arch}"
[ -z "${cow_chunksize}" ] && cow_chunksize="8"
# set mount handler for parabolaiso
export mount_handler="parabolaiso_mount_handler"
}
# This function is called normally from init script, but it can be called
# as chain from other mount handlers.
# args: /path/to/newroot
parabolaiso_mount_handler() {
local newroot="${1}"
local sigfile
if ! mountpoint -q "/run/parabolaiso/bootmnt"; then
_mnt_dev "${parabolaisodevice}" "/run/parabolaiso/bootmnt" "-r" "defaults"
if [ "${copytoram}" != "y" ]; then
readlink -f "${parabolaisodevice}" >> /run/parabolaiso/used_block_devices
fi
fi
# shellcheck disable=SC2154
# defined via initcpio's parse_cmdline()
if [ "${checksum}" = "y" ]; then
if [ -f "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.sha512" ]; then
msg -n ":: Self-test requested, please wait..."
if _verify_checksum; then
msg "done. Checksum is OK, continue booting."
else
echo "ERROR: one or more files are corrupted"
echo "see /tmp/checksum.log for details"
launch_interactive_shell
fi
else
echo "ERROR: checksum=y option specified but ${parabolaisobasedir}/${arch}/airootfs.sha512 not found"
launch_interactive_shell
fi
fi
# shellcheck disable=SC2154
# defined via initcpio's parse_cmdline()
if [ "${verify}" = "y" ]; then
if [ -f "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.sfs.sig" ]; then
sigfile="airootfs.sfs.sig"
elif [ -f "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.erofs.sig" ]; then
sigfile="airootfs.erofs.sig"
fi
if [ -n "${sigfile}" ]; then
msg -n ":: Signature verification requested, please wait..."
if _verify_signature "${sigfile}"; then
msg "done. Signature is OK, continue booting."
else
echo "ERROR: one or more files are corrupted"
launch_interactive_shell
fi
else
echo "ERROR: verify=y option specified but GPG signature not found in ${parabolaisobasedir}/${arch}/"
launch_interactive_shell
fi
fi
if [ "${copytoram}" = "y" ]; then
msg ":: Mounting /run/parabolaiso/copytoram (tmpfs) filesystem, size=${copytoram_size}"
mkdir -p /run/parabolaiso/copytoram
mount -t tmpfs -o "size=${copytoram_size}",mode=0755 copytoram /run/parabolaiso/copytoram
fi
if [ -n "${cow_device}" ]; then
_mnt_dev "${cow_device}" "/run/parabolaiso/cowspace" "-r" "${cow_flags}"
readlink -f "${cow_device}" >> /run/parabolaiso/used_block_devices
mount -o remount,rw "/run/parabolaiso/cowspace"
else
msg ":: Mounting /run/parabolaiso/cowspace (tmpfs) filesystem, size=${cow_spacesize}..."
mkdir -p /run/parabolaiso/cowspace
mount -t tmpfs -o "size=${cow_spacesize}",mode=0755 cowspace /run/parabolaiso/cowspace
fi
mkdir -p "/run/parabolaiso/cowspace/${cow_directory}"
chmod 0700 "/run/parabolaiso/cowspace/${cow_directory}"
if [ -f "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.sfs" ]; then
_mnt_sfs "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.sfs" "/run/parabolaiso/airootfs"
elif [ -f "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.erofs" ]; then
_mnt_erofs "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.erofs" "/run/parabolaiso/airootfs"
fi
if [ -f "/run/parabolaiso/airootfs/airootfs.img" ]; then
_mnt_dmsnapshot "/run/parabolaiso/airootfs/airootfs.img" "${newroot}" "/"
else
_mnt_overlayfs "/run/parabolaiso/airootfs" "${newroot}" "/"
fi
if [ "${copytoram}" = "y" ]; then
umount -d /run/parabolaiso/bootmnt
rmdir /run/parabolaiso/bootmnt
fi
}
# vim: set ft=sh:
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