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