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# Initialize loopback device logic (we using on-demand mode)
# args: none
_init_loop_dev() {
modprobe loop
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 ${ro_dev} 2> /dev/null)
dd of="/cowspace/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null
_next_loop_dev
rw_dev=$(_make_loop_dev "/cowspace/${img_name}.cow")
echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} N 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 "${img}" "/copytoram/${img_fullname}" ; then
echo "ERROR: while copy '${img}' to '/copytoram/${img_fullname}'"
launch_interactive_shell
fi
img="/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 '${mnt}'"
launch_interactive_shell
fi
}
_verify_checksum() {
local _status
cd "/bootmnt/${archisobasedir}"
md5sum -c checksum.md5 > /checksum.log 2>&1
_status=$?
cd "${OLDPWD}"
return ${_status}
}
run_hook() {
[[ -z "${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="/bootmnt/${archisobasedir}/aitab"
else
aitab="/bootmnt/${aitab}"
fi
# 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="${1}"
local fstype fserror
_init_loop_dev
msg ":: Waiting for boot device..."
while ! poll_device "${archisodevice}" 30; do
echo "ERROR: boot device didn't 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=$(blkid -o value -s TYPE -p "${archisodevice}" 2> /dev/null)
if [[ -n "${fstype}" ]]; then
if mount -r -t "${fstype}" "${archisodevice}" /bootmnt; then
if [[ -f "${aitab}" ]]; then
msg ":: Mounted archiso volume successfully."
fserror=0
else
echo "ERROR: Mounting was successful, but the '${aitab}' file does not exist."
fserror=1
fi
else
echo "ERROR; Failed to mount '${archisodevice}' (FS is ${fstype})"
fserror=1
fi
else
echo "ERROR: '${archisodevice}' found, but the filesystem type is unknown."
fserror=1
fi
if [[ ${fserror} -eq 1 ]]; then
echo " Falling back to interactive prompt"
echo " You can try to fix the problem manually, log out when you are finished"
launch_interactive_shell
fi
if [[ "${checksum}" == "y" ]]; then
if [[ -f "/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 -n ":: Mounting /copytoram (tmpfs) filesystem, size=${copytoram_size}..."
mount -t tmpfs -o "size=${copytoram_size}",mode=0755 copytoram /copytoram
msg "done."
fi
msg -n ":: Mounting /cowspace (tmpfs) filesystem, size=${cowspace_size}..."
mount -t tmpfs -o "size=${cowspace_size}",mode=0755 cowspace /cowspace
msg "done."
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 [[ "${aitab_sfs_comp}" != "none" ]]; then
_mnt_sfs "/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs.sfs" "/sfs/${aitab_img}"
_mnt_fs "/sfs/${aitab_img}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
else
_mnt_fs "/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
fi
else
_mnt_sfs "/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.sfs" "${newroot}${aitab_mnt}"
fi
done < "${aitab}"
if [[ "${copytoram}" == "y" ]]; then
umount /bootmnt
else
mkdir "${newroot}/bootmnt"
mount --bind /bootmnt "${newroot}/bootmnt"
fi
}
# vim:ft=sh:ts=4:sw=4:et:
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