# 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" echo $(readlink -f /dev/mapper/${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="${img##*/}" local sfs_dev if [[ "${copytoram}" == "y" ]]; then msg -n ":: Copying squashfs 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/${img_fullname}" msg "done." fi sfs_dev=$(losetup --find --show --read-only "${img}") echo ${sfs_dev} >> /run/parabolaiso/used_block_devices _mnt_dev "${sfs_dev}" "${mnt}" "-r" "defaults" } # args: device, mountpoint, flags, opts _mnt_dev() { local dev="${1}" local mnt="${2}" local flg="${3}" local opts="${4}" mkdir -p "${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 -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}" sha512sum -c airootfs.sha512 > /tmp/checksum.log 2>&1 _status=$? cd "${OLDPWD}" return ${_status} } _verify_signature() { local _status cd "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}" gpg --homedir /gpg --status-fd 1 --verify airootfs.sfs.sig 2>/dev/null | grep -qE '^\[GNUPG:\] GOODSIG' _status=$? cd "${OLDPWD}" 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" [[ -z "${parabolaisodevice}" ]] && parabolaisodevice="/dev/disk/by-label/${parabolaisolabel}" [[ -z "${cow_spacesize}" ]] && cow_spacesize="256M" if [[ -n "${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 "${cow_chunksize}" ]] && cow_chunksize="8" # set mount handler for parabolaiso mount_handler="parabolaiso_mount_handler" } # This function is called normally from init script, but it can be called # as chain from other mount handlers. # args: /path/to/newroot parabolaiso_mount_handler() { local newroot="${1}" if ! mountpoint -q "/run/parabolaiso/bootmnt"; then _mnt_dev "${parabolaisodevice}" "/run/parabolaiso/bootmnt" "-r" "defaults" if [[ "${copytoram}" != "y" ]]; then echo $(readlink -f ${parabolaisodevice}) >> /run/parabolaiso/used_block_devices fi fi if [[ "${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 if [[ "${verify}" == "y" ]]; then if [[ -f "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.sfs.sig" ]]; then msg -n ":: Signature verification requested, please wait..." if _verify_signature; 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 ${parabolaisobasedir}/${arch}/airootfs.sfs.sig not found" 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}" echo $(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=${cow_spacesize}",mode=0755 cowspace /run/parabolaiso/cowspace fi mkdir -p -m 0700 "/run/parabolaiso/cowspace/${cow_directory}" _mnt_sfs "/run/parabolaiso/bootmnt/${parabolaisobasedir}/${arch}/airootfs.sfs" "/run/parabolaiso/sfs/airootfs" if [[ -f "/run/parabolaiso/sfs/airootfs/airootfs.img" ]]; then _mnt_dmsnapshot "/run/parabolaiso/sfs/airootfs/airootfs.img" "${newroot}" "/" else _mnt_overlayfs "/run/parabolaiso/sfs/airootfs" "${newroot}" "/" fi if [[ "${copytoram}" == "y" ]]; then umount -d /run/parabolaiso/bootmnt fi } # vim:ft=sh:ts=4:sw=4:et: