#!/bin/sh
#
#  SPDX-License-Identifier: LGPL-2.1+
#
#  Copyright (c) 2021 Valve.
#  Maintainer: Guilherme G. Piccoli <gpiccoli@igalia.com>
#
#  Kdump-initrd module construction/inclusion script for
#  Dracut-based initramfs.
#

#  Only include kdump if it is explicitly asked in the argument list
check() {
    return 255
}

installkernel() {
    hostonly='' instmods ext4
}

install() {
    # A valid makedumpfile is essential for the kdump initrd creation.
    if [ ! -x "$(command -v makedumpfile)" ]; then
        logger "kdump: failed to create initrd, makedumpfile is missing"
        exit 1
    fi

    #  First clear all unnecessary firmwares/drivers added by drm in order to
    #  reduce the size of this minimal initramfs being created. This should
    #  be already done via command-line arguments, but let's play safe and delete
    #  from here as well just in case.
    rm -rf "$initdir"/usr/lib/firmware/amdgpu/
    rm -rf "$initdir"/usr/lib/modules/*/kernel/drivers/gpu/drm/amd/*

    #  Install necessary binaries
    inst date
    inst sync
    inst makedumpfile

    mkdir -p "$initdir"/usr/lib/kdump/conf

    #  Load the necessary external variables, otherwise it'll fail later.
    HAVE_CFG_FILES=0
    shopt -s nullglob
    for cfg in "/usr/share/kdump.d"/*; do
        if [ -f "$cfg" ]; then
            . "$cfg"
            HAVE_CFG_FILES=1
        fi
    done
    shopt -u nullglob

    if [ ${HAVE_CFG_FILES} -eq 0 ]; then
        logger "kdump: no config files in /usr/share/kdump.d/ - aborting."
        exit 1
    fi

    cp -LR --preserve=all "/usr/share/kdump.d"/* "$initdir"/usr/lib/kdump/conf/

    #  Determine the numerical devnode for kdump, and save it on initrd;
    #  notice that partset link is not available that early in boot time.
    DEVN="$(readlink -f "${MOUNT_DEVNODE}")"
    echo "${DEVN}" > "$initdir"/usr/lib/kdump/kdump.devnode

    cp -LR --preserve=all /usr/lib/kdump/* "$initdir"/usr/lib/kdump/

    inst_hook pre-mount 01 "$moddir/kdump-collect.sh"
}