archiso 8.64 KB
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#!/bin/ash

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# args: source, newroot, mountpoint
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_mnt_dmsnapshot() {
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    local img="${1}"
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    local newroot="${2}"
    local mnt="${3}"
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    local img_fullname="${img##*/}";
    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 -- "${img}")"
    echo "${ro_dev}" >> /run/archiso/used_block_devices
    ro_dev_size="$(blockdev --getsz -- "${ro_dev}")"
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    if [ "${cow_persistent}" = "P" ]; then
        if [ -f "/run/archiso/cowspace/${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}/${img_name}.cow' as persistent."
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            truncate -s "${cow_spacesize}" "/run/archiso/cowspace/${cow_directory}/${img_name}.cow"
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        fi
    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."
            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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        truncate -s "${cow_spacesize}" "/run/archiso/cowspace/${cow_directory}/${img_name}.cow"
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    fi

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    rw_dev="$(losetup --find --show "/run/archiso/cowspace/${cow_directory}/${img_name}.cow")"
    echo "${rw_dev}" >> /run/archiso/used_block_devices
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    dmsetup create "${dm_snap_name}" --table \
        "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} ${cow_chunksize}"
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    if [ "${cow_persistent}" != "P" ]; then
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        rm -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow"
    fi

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    _mnt_dev "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" "-w" "defaults"
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    readlink -f "/dev/mapper/${dm_snap_name}" >> /run/archiso/used_block_devices
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}

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# args: source, newroot, mountpoint
_mnt_overlayfs() {
    local src="${1}"
    local newroot="${2}"
    local mnt="${3}"
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    mkdir -p "/run/archiso/cowspace/${cow_directory}/upperdir" "/run/archiso/cowspace/${cow_directory}/workdir"
    mount -t overlay -o \
    "lowerdir=${src},upperdir=/run/archiso/cowspace/${cow_directory}/upperdir,workdir=/run/archiso/cowspace/${cow_directory}/workdir" \
    airootfs "${newroot}${mnt}"
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}


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# args: /path/to/image_file, mountpoint
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_mnt_sfs() {
    local img="${1}"
    local mnt="${2}"
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    local img_fullname="${img##*/}"
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    local sfs_dev
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    # shellcheck disable=SC2154 # defined via initcpio's parse_cmdline()
    if [ "${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
        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 -- "${img}")"
    echo "${sfs_dev}" >> /run/archiso/used_block_devices
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    _mnt_dev "${sfs_dev}" "${mnt}" "-r" "defaults"
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}

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# args: device, mountpoint, flags, opts
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_mnt_dev() {
    local dev="${1}"
    local mnt="${2}"
    local flg="${3}"
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    local opts="${4}"
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    mkdir -p "${mnt}"

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    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

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    if mount -o "${opts}" "${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"
        echo "   You can try to fix the problem manually, log out when you are finished"
        launch_interactive_shell
    fi
}

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_verify_checksum() {
    local _status
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    cd "/run/archiso/bootmnt/${archisobasedir}/${arch}" || exit 1
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    sha512sum -c airootfs.sha512 > /tmp/checksum.log 2>&1
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    _status=$?
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    cd -- "${OLDPWD}" || exit 1
    return "${_status}"
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}

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_verify_signature() {
    local _status
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    cd "/run/archiso/bootmnt/${archisobasedir}/${arch}" || exit 1
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    gpg --homedir /gpg --status-fd 1 --verify airootfs.sfs.sig 2>/dev/null | grep -qE '^\[GNUPG:\] GOODSIG'
    _status=$?
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    cd -- "${OLDPWD}" || exit 1
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    return ${_status}
}

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run_hook() {
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    [ -z "${arch}" ] && arch="$(uname -m)"
    [ -z "${copytoram_size}" ] && copytoram_size="75%"
    [ -z "${archisobasedir}" ] && archisobasedir="arch"
    [ -z "${dm_snap_prefix}" ] && dm_snap_prefix="arch"
    # shellcheck disable=SC2154 # defined via initcpio's parse_cmdline()
    [ -z "${archisodevice}" ] && archisodevice="/dev/disk/by-label/${archisolabel}"
    [ -z "${cow_spacesize}" ] && cow_spacesize="256M"
    # shellcheck disable=SC2154 # defined via initcpio's parse_cmdline()
    if [ -n "${cow_label}" ]; then
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        cow_device="/dev/disk/by-label/${cow_label}"
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        [ -z "${cow_persistent}" ] && cow_persistent="P"
    elif [ -n "${cow_device}" ]; then
        [ -z "${cow_persistent}" ] && cow_persistent="P"
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    else
        cow_persistent="N"
    fi

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    [ -z "${cow_flags}" ] && cow_flags="defaults"
    [ -z "${cow_directory}" ] && cow_directory="persistent_${archisolabel}/${arch}"
    [ -z "${cow_chunksize}" ] && cow_chunksize="8"
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    # set mount handler for archiso
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    export 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
# as chain from other mount handlers.
# 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 "${archisodevice}" "/run/archiso/bootmnt" "-r" "defaults"
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        if [ "${copytoram}" != "y" ]; then
            readlink -f "${archisodevice}" >> /run/archiso/used_block_devices
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        fi
    fi

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    # shellcheck disable=SC2154 # defined via initcpio's parse_cmdline()
    if [ "${checksum}" = "y" ]; then
        if [ -f "/run/archiso/bootmnt/${archisobasedir}/${arch}/airootfs.sha512" ]; then
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            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"
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                echo "see /tmp/checksum.log for details"
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                launch_interactive_shell
            fi
        else
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            echo "ERROR: checksum=y option specified but ${archisobasedir}/${arch}/airootfs.sha512 not found"
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            launch_interactive_shell
        fi
    fi

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    # shellcheck disable=SC2154 # defined via initcpio's parse_cmdline()
    if [ "${verify}" = "y" ]; then
        if [ -f "/run/archiso/bootmnt/${archisobasedir}/${arch}/airootfs.sfs.sig" ]; then
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            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 ${archisobasedir}/${arch}/airootfs.sfs.sig not found"
            launch_interactive_shell
        fi
    fi

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    if [ "${copytoram}" = "y" ]; then
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        msg ":: Mounting /run/archiso/copytoram (tmpfs) filesystem, size=${copytoram_size}"
        mkdir -p /run/archiso/copytoram
        mount -t tmpfs -o "size=${copytoram_size}",mode=0755 copytoram /run/archiso/copytoram
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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" "${cow_flags}"
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        readlink -f "${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=${cow_spacesize}..."
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        mkdir -p /run/archiso/cowspace
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        mount -t tmpfs -o "size=${cow_spacesize}",mode=0755 cowspace /run/archiso/cowspace
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    fi
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    mkdir -p "/run/archiso/cowspace/${cow_directory}"
    chmod 0700 "/run/archiso/cowspace/${cow_directory}"
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    _mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${arch}/airootfs.sfs" "/run/archiso/sfs/airootfs"
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    if [ -f "/run/archiso/sfs/airootfs/airootfs.img" ]; then
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        _mnt_dmsnapshot "/run/archiso/sfs/airootfs/airootfs.img" "${newroot}" "/"
    else
        _mnt_overlayfs "/run/archiso/sfs/airootfs" "${newroot}" "/"
    fi
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    if [ "${copytoram}" = "y" ]; then
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        umount -d /run/archiso/bootmnt
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    fi
}
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# vim: set ft=sh: