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-rw-r--r--hooks/archiso198
1 files changed, 198 insertions, 0 deletions
diff --git a/hooks/archiso b/hooks/archiso
new file mode 100644
index 0000000..9445498
--- /dev/null
+++ b/hooks/archiso
@@ -0,0 +1,198 @@
+# 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 ${ro_dev})
+
+ if [[ "${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
+
+ 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
+ echo "/dev/mapper/${dm_snap_name} ${mnt} auto defaults 0 0" >> ${newroot}/etc/fstab
+}
+
+# args: /path/to/image_file, mountpoint
+_mnt_sfs() {
+ local img="${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 ${_status}
+}
+
+run_hook() {
+ [[ -z "${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/${archisobasedir}/aitab"
+ else
+ aitab="/run/archiso/bootmnt/${archisobasedir}/${aitab}"
+ fi
+
+ if [[ -n "${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}"
+
+ if ! mountpoint -q "/run/archiso/bootmnt"; then
+ _mnt_dev "${archisodevice}" "/run/archiso/bootmnt" "-r"
+ if [[ "${copytoram}" != "y" ]]; then
+ echo $(readlink -f ${archisodevice}) >> /run/archiso/used_block_devices
+ fi
+ fi
+
+
+ if [[ ! -f "${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/${archisobasedir}/checksum.${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}"
+
+ 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
+ _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_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.sfs" "${newroot}${aitab_mnt}"
+ fi
+ done < "${aitab}"
+
+ if [[ "${copytoram}" == "y" ]]; then
+ umount /run/archiso/bootmnt
+ fi
+}
+
+# vim:ft=sh:ts=4:sw=4:et: