#!/usr/bin/env bash
# -*- coding: utf-8 -*-
# region header
source "$(dirname "${BASH_SOURCE[0]}")/scripts/rebash/core.sh"
core.import exceptions
core.import logging
core.import utils
core.import "$(core_abs_path "$(dirname "${BASH_SOURCE[0]}")/scripts/build.sh")"
# endregion
# region forward "build-initrfams.sh" logging configuration if present.
# set log level via dracut logging options
_parse_dracut_args() {
    local verbose=false
    local debug=false
    while true; do
        case "$1" in
            --stdlog)
                shift
                local level="$1"
                shift
                [[ "$level" -ge 4 ]] && debug=true
                ;;
            --verbose)
                shift
                verbose=true
                ;;
            '')
                break
                ;;
            *)
                shift
                ;;
        esac
        local level
        $verbose && level=info
        $debug && level=debug
        logging.set_level "$level"
        logging.set_commands_level debug
    done
    $debug
    return $?
}
_debug=0
_parse_dracut_args ${dracut_args[*]} || _debug=$?
# endregion
clean() {
    # NOTE: This method is currently triggered manually and not supported by
    # dracut itself.
    build_clean_xmount "$moddir/binaries/xmount/"
    build_clean_qemu_xmount "$moddir/binaries/qemu-xmount/"
    build_clean_dnbd3 "$moddir/binaries/dnbd3/"
    build_clean_systemd_preserve_process_marker \
        "$moddir/binaries/systemd-preserve-process-marker/"
    return 0
}
# region dracut plugin api
check() {
    # Checks weather all template system assumptions are satisfied
    exceptions.activate
    # NOTE: xmount must be compiled before qemu_xmount
    local xmount_is_built=true
    if [[ ! -f "$moddir/binaries/xmount/trunk/build/src/xmount" ]]; then
        if ! build_compile_xmount "$moddir/binaries/xmount/"; then
            xmount_is_built=false
        fi
    fi
    if $xmount_is_built && [[ \
        ! -f "$moddir/binaries/qemu-xmount/libxmount_input_qemu.so" \
    ]]; then
        build_compile_qemu_xmount "$moddir/binaries/qemu-xmount/" || \
        xmount_is_built=false
    fi
    $xmount_is_built || logging.warn \
        "Compiling \"xmount\" failed -> No support for container files (only raw images)."

    if [[ ! -f "$moddir/binaries/dnbd3/build/dnbd3.ko" ]] || \
       [[ ! -f "$moddir/binaries/dnbd3/build/dnbd3-client" ]]
    then
        build_compile_dnbd3 "$moddir/binaries/dnbd3/"
        [[ $? != 0 ]] && return 1
    fi
    if [[ ! -f "$moddir/binaries/systemd-preserve-process-marker/systemd-preserve-process-marker" ]]; then
        build_compile_systemd_preserve_process_marker \
            "$moddir/binaries/systemd-preserve-process-marker/"
            [[ $? != 0 ]] && return 1
    fi
    # NOTE: This are workarounds for:
    # - distributions where "systemd-udevd" doesn't lives in "/usr/lib" but in
    #   "/lib".
    local alternate_systemd_udevd_location='/lib/systemd/systemd-udevd'
    if [[ ! -f "${systemdutildir}/systemd-udevd" ]] && \
    [[ -f "$alternate_systemd_udevd_location" ]]; then
        mkdir --parents "${initdir}${systemdutildir}"
        ln --symbolic --force "$alternate_systemd_udevd_location" \
            "${initdir}${systemdutildir}/systemd-udevd"
        #cp "$alternate_systemd_udevd_location" \
        #    "${initdir}${systemdutildir}/systemd-udevd" 1>&2
    fi
    # - "/usr/bin/sh" isn't available but "/bin/sh".
    if [[ ! -f /usr/bin/sh ]] && [[ -f /bin/sh ]]; then
        ln --symbolic --force /bin/sh /usr/bin/sh
    fi
    exceptions.deactivate
    # Tell dracut that this module should only be included if it is required
    # explicitly.
    return 255
}
depends() {
    # NOTE: btrfs module should be used if it would work.
    echo base network bash kernel-modules shutdown
}
installkernel() {
    inst "$moddir/binaries/dnbd3/build/dnbd3.ko" \
        /usr/lib/modules/current/extra/dnbd3.ko
    instmods dm_snapshot btrfs crc32c
}
install() {
    # region binaries
    inst "$moddir/binaries/dnbd3/build/dnbd3-client" /usr/bin/dnbd3-client
    inst \
        "$moddir/binaries/systemd-preserve-process-marker/systemd-preserve-process-marker" \
        /usr/bin/systemd-preserve-process-marker
    inst "$moddir/scripts/device-add-write-layer.sh" \
        /usr/bin/device-add-write-layer
    inst "$moddir/scripts/container-unpack-xmount.sh" \
        /usr/bin/container-unpack-xmount
    # xmount
    local \
        xmount_installation="$moddir/binaries/xmount/trunk/build/release_build"
    inst "${xmount_installation}/usr/bin/xmount" /usr/bin/xmount
    for file in ${xmount_installation}/usr/lib/xmount/*; do
        inst "$file" /usr/lib/xmount/"$(basename "$file")"
    done
    inst "$moddir/binaries/qemu-xmount/libxmount_input_qemu.so" \
        /usr/lib/xmount/libxmount_input_qemu.so
    # endregion
    # region hooks
    inst_hook cmdline 00 "$moddir/hooks/enable-sysrq.sh"
    inst_hook cmdline 10 \
        "$moddir/hooks/prepare-kernel-command-line-parameter.sh"
    inst_hook cmdline 90 "$moddir/hooks/set-dracut-environment-variables.sh"
    # load dnbd3.ko
    inst_hook pre-udev 00 "$moddir/hooks/load-custom-kernel-modules.sh"
    # get the openslx config from the servers configured in the kernel command
    # line (${SLX_SERVER}/${SLX_SERVER_BASE}/config)
    inst_hook pre-mount 00 "$moddir/hooks/fetch-config.sh"
    # make the final blockdevice for the root system (dnbd3 -> xmount ->
    # device-mapper)
    if dracut_module_included "systemd-initrd"; then
        inst "$moddir/hooks/prepare-root-partition.sh" \
            /usr/bin/dnbd3root
        inst_simple "${moddir}/services/dnbd3root.service" \
            "${systemdsystemunitdir}/dnbd3root.service"
        mkdir --parents \
            "${initdir}/${systemdsystemunitdir}/dracut-mount.service.requires"
        ln_r "${systemdsystemunitdir}/dnbd3root.service" \
            "${systemdsystemunitdir}/dracut-mount.service.requires/dnbd3root.service"
        mkdir --parents \
            "${initdir}/${systemdsystemunitdir}/initrd.target.requires"
        ln_r "${systemdsystemunitdir}/dnbd3root.service" \
            "${systemdsystemunitdir}/initrd.target.requires/dnbd3root.service"
        # Copy systemd services to new root (so they don't get killed after
        # switch_root)
        inst_hook pre-pivot 00 \
            "$moddir/hooks/copy-dnbd3-service-into-newroot.sh"
        inst_hook pre-pivot 00 \
            "$moddir/hooks/copy-dracut-systemd-files-into-newroot.sh"
    else
        inst_hook pre-mount 10 "$moddir/hooks/prepare-root-partition.sh"
    fi
    inst_hook mount 10 "$moddir/hooks/mount-root-device.sh"
    inst_hook pre-pivot 00 \
        "$moddir/hooks/copy-openslx-configuration-into-newroot.sh"
    # endregion
    # region scripts
    local file_path
    for file_path in "$moddir/scripts/rebash/"*; do
        inst "$file_path" "/usr/lib/rebash/$(basename "$file_path")"
    done
    inst "$moddir/scripts/tools.sh" "/usr/lib/openslx/tools.sh"
    # endregion
    # region configuration files
    # Use terminal readline settings from the template system.
    inst /etc/inputrc /etc/inputrc
    # Set some aliases for the initramfs context.
    if [[ "$_debug" == 0 ]]; then
        inst "$moddir/configuration/bash" '/etc/bash.bashrc'
        inst "$moddir/configuration/bash" '/etc/profile.d/aliases'
    fi
    # endregion
    inst_multiple \
        awk \
        basename bash blockdev \
        cat cut \
        dd diff dirname dmsetup \
        find \
        genfstab \
        grep \
        insmod \
        losetup lsblk \
        mktemp mount mountpoint \
        qemu-img \
        sed sleep sort \
        touch tr \
        wget
}
# endregion
# region vim modline
# vim: set tabstop=4 shiftwidth=4 expandtab:
# vim: foldmethod=marker foldmarker=region,endregion:
# endregion