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# Initialize loopback device logic (we using on-demand mode)
# args: none
_init_loop_dev() {
loop_dev_count=99
loop_dev_range=$(cat /sys/block/loop0/range)
loop_dev_minor=$((loop_dev_count*loop_dev_range))
}
# Call this function before _make_loop_dev() each time.
# args: none
_next_loop_dev() {
loop_dev_count=$((loop_dev_count+1))
loop_dev_minor=$((loop_dev_count*loop_dev_range))
}
# Setup a loopback device for image passed as argument and echo the path to loopback device used.
# args: /path/to/image_file
_make_loop_dev() {
local img="${1}"
mknod /dev/loop${loop_dev_count} b 7 ${loop_dev_minor} &> /dev/null
losetup /dev/loop${loop_dev_count} "${img}" &> /dev/null
echo /dev/loop${loop_dev_count}
}
# args: source, mountpoint
_mnt_fs() {
local img="${1}"
local mnt="${2}"
local img_fullname="${img##*/}";
local img_name="${img_fullname%%.*}"
local dm_snap_name="${dm_snap_prefix}_${img_name}"
local ro_dev ro_dev_size ro_dev_fs_type rw_dev
mkdir -p "${mnt}"
_next_loop_dev
ro_dev=$(_make_loop_dev "${img}")
ro_dev_size=$(blockdev --getsz ${ro_dev})
ro_dev_fs_type=$(blkid -o value -s TYPE -p ${ro_dev} 2> /dev/null)
if [[ "${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=${ro_dev_size} &> /dev/null
fi
else
if [[ -f "/run/archiso/cowspace/${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}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null
fi
_next_loop_dev
rw_dev=$(_make_loop_dev "/run/archiso/cowspace/${cow_directory}/${img_name}.cow")
echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8" | dmsetup create ${dm_snap_name}
msg ":: Mounting '/dev/mapper/${dm_snap_name}' (${ro_dev_fs_type}) to '${mnt}'"
if ! mount -t "${ro_dev_fs_type}" "/dev/mapper/${dm_snap_name}" "${mnt}" ; then
echo "ERROR: while mounting '/dev/mapper/${dm_snap_name}' to '${mnt}'"
launch_interactive_shell
fi
}
# args: /path/to/image_file, mountpoint
_mnt_sfs() {
local img="${1}"
local mnt="${2}"
local img_fullname="${img##*/}";
mkdir -p "${mnt}"
if [[ "${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/${img_fullname}"
msg "done."
fi
_next_loop_dev
msg ":: Mounting '${img}' (SquashFS) to '${mnt}'"
if ! mount -r -t squashfs $(_make_loop_dev "${img}") "${mnt}" &> /dev/null ; then
echo "ERROR: while mounting '${img}' to '${mnt}'"
launch_interactive_shell
fi
}
# args: device, mountpoint, flags
_mnt_dev() {
local dev="${1}"
local mnt="${2}"
local flg="${3}"
local fstype fserror
mkdir -p "${mnt}"
msg ":: Mounting '${dev}' to '${mnt}'"
while ! poll_device "${dev}" 30; do
echo "ERROR: '${dev}' device did not show up after 30 seconds..."
echo " Falling back to interactive prompt"
echo " You can try to fix the problem manually, log out when you are finished"
launch_interactive_shell
done
fstype=$(blkid -o value -s TYPE -p "${dev}" 2> /dev/null)
if [[ -n "${fstype}" ]]; then
if mount ${flg} -t "${fstype}" "${dev}" "${mnt}"; then
msg ":: Device '${dev}' mounted successfully."
fserror=0
else
echo "ERROR; Failed to mount '${dev}' (FS is ${fstype})"
fserror=1
fi
else
echo "ERROR: '${dev}' found, but the filesystem type is unknown."
fserror=1
fi
if [[ ${fserror} -eq 1 ]]; then
echo " Falling back to interactive prompt"
echo " You can try to fix the problem manually, log out when you are finished"
launch_interactive_shell
fi
}
_verify_checksum() {
local _status
cd "/run/archiso/bootmnt/${archisobasedir}"
md5sum -c checksum.md5 > /checksum.log 2>&1
_status=$?
cd "${OLDPWD}"
return ${_status}
}
run_hook() {
modprobe loop
[[ -z "${arch}" ]] && 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/${archisolabel}"
if [[ -z "${aitab}" ]]; then
aitab="/run/archiso/bootmnt/${archisobasedir}/aitab"
else
aitab="/run/archiso/bootmnt/${aitab}"
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="${1}"
_init_loop_dev
if [[ "${archisodevice}" -ef "${cow_device}" ]]; then
_mnt_dev "${archisodevice}" "/run/archiso/bootmnt"
else
_mnt_dev "${archisodevice}" "/run/archiso/bootmnt" "-r"
fi
if [[ ! -f "${aitab}" ]]; then
echo "ERROR: '${aitab}' file does not exist."
echo " Falling back to interactive prompt"
echo " You can try to fix the problem manually, log out when you are finished"
launch_interactive_shell
fi
if [[ "${checksum}" == "y" ]]; then
if [[ -f "/run/archiso/bootmnt/${archisobasedir}/checksum.md5" ]]; then
msg -n ":: Self-test requested, please wait..."
if _verify_checksum; then
msg "done. Checksum is OK, continue booting."
else
echo "ERROR: one or more files are corrupted"
echo "see /checksum.log for details"
launch_interactive_shell
fi
else
echo "ERROR: checksum=y option specified but checksum.md5 not found"
launch_interactive_shell
fi
fi
if [[ "${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"
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/${cow_directory}"
local aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size
while read aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size; do
[[ "${aitab_img#\#}" != "${aitab_img}" ]] && continue
[[ "${aitab_arch}" != "any" && "${aitab_arch}" != "${arch}" ]] && continue
if [[ "${aitab_fs_type}" != "none" ]]; then
if [[ "${aitab_sfs_comp}" != "none" ]]; then
_mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs.sfs" "/run/archiso/sfs/${aitab_img}"
_mnt_fs "/run/archiso/sfs/${aitab_img}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
else
_mnt_fs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
fi
else
_mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.sfs" "${newroot}${aitab_mnt}"
fi
done < "${aitab}"
if [[ "${copytoram}" == "y" ]]; then
umount /run/archiso/bootmnt
else
mkdir -p "${newroot}/bootmnt"
mount --bind /run/archiso/bootmnt "${newroot}/bootmnt"
fi
}
# vim:ft=sh:ts=4:sw=4:et:
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