305bca4692
This was useful to me during development of dm-snapshot support to create very quickly isos without wating for SquashFS compression. Is time to remove this, I think the is no practical usage, and make the code a bit more simple. Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>
229 lines
8.2 KiB
Bash
229 lines
8.2 KiB
Bash
# Initialize loopback device logic (we using on-demand mode)
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# args: none
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_init_loop_dev() {
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loop_dev_count=99
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loop_dev_range=$(cat /sys/block/loop0/range)
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loop_dev_minor=$((loop_dev_count*loop_dev_range))
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}
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# Call this function before _make_loop_dev() each time.
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# args: none
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_next_loop_dev() {
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loop_dev_count=$((loop_dev_count+1))
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loop_dev_minor=$((loop_dev_count*loop_dev_range))
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}
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# Setup a loopback device for image passed as argument and echo the path to loopback device used.
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# args: /path/to/image_file
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_make_loop_dev() {
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local img="${1}"
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mknod /dev/loop${loop_dev_count} b 7 ${loop_dev_minor} &> /dev/null
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losetup /dev/loop${loop_dev_count} "${img}" &> /dev/null
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echo /dev/loop${loop_dev_count}
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}
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# args: source, mountpoint
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_mnt_fs() {
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local img="${1}"
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local mnt="${2}"
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local img_fullname="${img##*/}";
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local img_name="${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 ro_dev_fs_type rw_dev
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mkdir -p "${mnt}"
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_next_loop_dev
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ro_dev=$(_make_loop_dev "${img}")
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ro_dev_size=$(blockdev --getsz ${ro_dev})
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ro_dev_fs_type=$(blkid -o value -s TYPE -p ${ro_dev} 2> /dev/null)
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if [[ "${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=${ro_dev_size} &> /dev/null
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fi
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else
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if [[ -f "/run/archiso/cowspace/${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}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null
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fi
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_next_loop_dev
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rw_dev=$(_make_loop_dev "/run/archiso/cowspace/${cow_directory}/${img_name}.cow")
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echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8" | dmsetup create ${dm_snap_name}
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msg ":: Mounting '/dev/mapper/${dm_snap_name}' (${ro_dev_fs_type}) to '${mnt}'"
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if ! mount -t "${ro_dev_fs_type}" "/dev/mapper/${dm_snap_name}" "${mnt}" ; then
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echo "ERROR: while mounting '/dev/mapper/${dm_snap_name}' to '${mnt}'"
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launch_interactive_shell
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fi
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}
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# args: /path/to/image_file, mountpoint
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_mnt_sfs() {
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local img="${1}"
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local mnt="${2}"
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local img_fullname="${img##*/}";
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mkdir -p "${mnt}"
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if [[ "${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/${img_fullname}"
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msg "done."
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fi
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_next_loop_dev
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msg ":: Mounting '${img}' (SquashFS) to '${mnt}'"
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if ! mount -r -t squashfs $(_make_loop_dev "${img}") "${mnt}" &> /dev/null ; then
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echo "ERROR: while mounting '${img}' to '${mnt}'"
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launch_interactive_shell
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fi
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}
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# args: device, mountpoint, flags
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_mnt_dev() {
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local dev="${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/${archisobasedir}"
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md5sum -c checksum.${arch}.md5 > /tmp/checksum.${arch}.log 2>&1
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_status=$?
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cd "${OLDPWD}"
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return ${_status}
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}
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run_hook() {
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modprobe loop
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[[ -z "${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/${archisolabel}"
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if [[ -z "${aitab}" ]]; then
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aitab="/run/archiso/bootmnt/${archisobasedir}/aitab"
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else
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aitab="/run/archiso/bootmnt/${archisobasedir}/${aitab}"
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fi
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if [[ -n "${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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_init_loop_dev
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mountpoint -q "/run/archiso/bootmnt" || _mnt_dev "${archisodevice}" "/run/archiso/bootmnt" "-r"
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if [[ ! -f "${aitab}" ]]; then
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echo "ERROR: '${aitab}' file does not exist."
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echo " Falling back to interactive prompt"
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echo " You can try to fix the problem manually, log out when you are finished"
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launch_interactive_shell
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fi
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if [[ "${checksum}" == "y" ]]; then
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if [[ -f "/run/archiso/bootmnt/${archisobasedir}/checksum.${arch}.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.${arch}.log for details"
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launch_interactive_shell
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fi
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else
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echo "ERROR: checksum=y option specified but checksum.${arch}.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 "${cow_device}" "/run/archiso/cowspace" "-r"
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mount -o remount,rw "/run/archiso/cowspace"
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else
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msg ":: Mounting /run/archiso/cowspace (tmpfs) filesystem, size=${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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local aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size
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while read aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size; do
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[[ "${aitab_img#\#}" != "${aitab_img}" ]] && continue
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[[ "${aitab_arch}" != "any" && "${aitab_arch}" != "${arch}" ]] && continue
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if [[ "${aitab_fs_type}" != "none" ]]; then
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_mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs.sfs" "/run/archiso/sfs/${aitab_img}"
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_mnt_fs "/run/archiso/sfs/${aitab_img}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
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else
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_mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.sfs" "${newroot}${aitab_mnt}"
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fi
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done < "${aitab}"
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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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