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# args: source, newroot, mountpoint
_mnt_fs() {
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 ${ro_dev} >> /run/archiso/used_block_devices
ro_dev_size=$(blockdev --getsz ${ro_dev})
if [[ "${cowfile_size}" == "100" ]]; then
rw_dev_size=${ro_dev_size}
else
# size calculation done in this way to avoid integer overflow when ro_dev_size is > 10.2G
rw_dev_size=$((ro_dev_size/100*cowfile_size))
fi
if [[ "${cow_persistent}" == "P" ]]; then
if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then
msg ":: Found '/run/archiso/cowspace/${cow_directory}/${img_name}.cow', using as persistent."
else
msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as persistent."
dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${rw_dev_size} &> /dev/null
fi
else
if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then
msg ":: Found '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' but non-persistent requested, removing."
rm -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow"
fi
msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as non-persistent."
dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${rw_dev_size} &> /dev/null
fi
rw_dev=$(losetup --find --show "/run/archiso/cowspace/${cow_directory}/${img_name}.cow")
echo ${rw_dev} >> /run/archiso/used_block_devices
echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8" | dmsetup create ${dm_snap_name}
_mnt_dev "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" "-w"
echo $(readlink -f /dev/mapper/${dm_snap_name}) >> /run/archiso/used_block_devices
}
# args: /path/to/image_file, mountpoint
_mnt_sfs() {
local img="${1}"
local mnt="${2}"
local img_fullname="${img##*/}"
local sfs_dev
if [[ "${copytoram}" == "y" ]]; then
msg -n ":: Copying squashfs image to RAM..."
if ! cp "${img}" "/run/archiso/copytoram/${img_fullname}" ; then
echo "ERROR: while copy '${img}' to '/run/archiso/copytoram/${img_fullname}'"
launch_interactive_shell
fi
img="/run/archiso/copytoram/${img_fullname}"
msg "done."
fi
sfs_dev=$(losetup --find --show --read-only "${img}")
echo ${sfs_dev} >> /run/archiso/used_block_devices
_mnt_dev "${sfs_dev}" "${mnt}" "-r"
}
# args: device, mountpoint, flags
_mnt_dev() {
local dev="${1}"
local mnt="${2}"
local flg="${3}"
mkdir -p "${mnt}"
msg ":: Mounting '${dev}' to '${mnt}'"
while ! poll_device "${dev}" 30; do
echo "ERROR: '${dev}' device did not show up after 30 seconds..."
echo " Falling back to interactive prompt"
echo " You can try to fix the problem manually, log out when you are finished"
launch_interactive_shell
done
if mount "${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/archiso/bootmnt/${archisobasedir}"
md5sum -c checksum.${arch}.md5 > /tmp/checksum.${arch}.log 2>&1
_status=$?
cd "${OLDPWD}"
return ${_status}
}
run_hook() {
arch="$(uname -m)"
[[ -z "${cowspace_size}" ]] && cowspace_size="75%"
[[ -z "${copytoram_size}" ]] && copytoram_size="75%"
[[ -z "${archisobasedir}" ]] && archisobasedir="arch"
[[ -z "${dm_snap_prefix}" ]] && dm_snap_prefix="arch"
[[ -z "${archisodevice}" ]] && archisodevice="/dev/disk/by-label/${archisolabel}"
if [[ -z "${cowfile_size}" ]]; then
cowfile_size="100"
else
cowfile_size=${cowfile_size/%}
fi
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_directory}" ]] && cow_directory="persistent_${archisolabel}/${arch}"
# set mount handler for archiso
mount_handler="archiso_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
archiso_mount_handler() {
local newroot="${1}"
if ! mountpoint -q "/run/archiso/bootmnt"; then
_mnt_dev "${archisodevice}" "/run/archiso/bootmnt" "-r"
if [[ "${copytoram}" != "y" ]]; then
echo $(readlink -f ${archisodevice}) >> /run/archiso/used_block_devices
fi
fi
if [[ "${checksum}" == "y" ]]; then
if [[ -f "/run/archiso/bootmnt/${archisobasedir}/checksum.${arch}.md5" ]]; 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.${arch}.log for details"
launch_interactive_shell
fi
else
echo "ERROR: checksum=y option specified but checksum.${arch}.md5 not found"
launch_interactive_shell
fi
fi
if [[ "${copytoram}" == "y" ]]; then
msg ":: Mounting /run/archiso/copytoram (tmpfs) filesystem, size=${copytoram_size}"
mkdir -p /run/archiso/copytoram
mount -t tmpfs -o "size=${copytoram_size}",mode=0755 copytoram /run/archiso/copytoram
fi
if [[ -n "${cow_device}" ]]; then
_mnt_dev "${cow_device}" "/run/archiso/cowspace" "-r"
echo $(readlink -f ${cow_device}) >> /run/archiso/used_block_devices
mount -o remount,rw "/run/archiso/cowspace"
else
msg ":: Mounting /run/archiso/cowspace (tmpfs) filesystem, size=${cowspace_size}..."
mkdir -p /run/archiso/cowspace
mount -t tmpfs -o "size=${cowspace_size}",mode=0755 cowspace /run/archiso/cowspace
fi
mkdir -p "/run/archiso/cowspace/${cow_directory}"
_mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${arch}/airootfs.fs.sfs" "/run/archiso/sfs/airootfs"
_mnt_fs "/run/archiso/sfs/airootfs/airootfs.fs" "${newroot}" "/"
if [[ "${copytoram}" == "y" ]]; then
umount /run/archiso/bootmnt
fi
}
# vim:ft=sh:ts=4:sw=4:et:
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