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Current File : /usr/lib/dracut/dracut-init.sh
#!/bin/bash
#
# functions used only by dracut and dracut modules
#
# Copyright 2005-2009 Red Hat, Inc.  All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
export LC_MESSAGES=C

if [[ "$EUID" = "0" ]]; then
    export DRACUT_CP="cp --reflink=auto --sparse=auto --preserve=mode,timestamps,xattr,links -dfr"
else
    export DRACUT_CP="cp --reflink=auto --sparse=auto --preserve=mode,timestamps,links -dfr"
fi

# is_func <command>
# Check whether $1 is a function.
is_func() {
    [[ "$(type -t "$1")" = "function" ]]
}

if ! [[ $dracutbasedir ]]; then
    dracutbasedir=${BASH_SOURCE[0]%/*}
    [[ $dracutbasedir = dracut-functions* ]] && dracutbasedir="."
    [[ $dracutbasedir ]] || dracutbasedir="."
    dracutbasedir="$(readlink -f $dracutbasedir)"
fi

if ! is_func dinfo >/dev/null 2>&1; then
    . "$dracutbasedir/dracut-logger.sh"
    dlog_init
fi

if ! [[ $initdir ]]; then
    dfatal "initdir not set"
    exit 1
fi

if ! [[ -d $initdir ]]; then
    mkdir -p "$initdir"
fi

if ! [[ $kernel ]]; then
    kernel=$(uname -r)
    export kernel
fi

srcmods="/lib/modules/$kernel/"

[[ $drivers_dir ]] && {
    if ! command -v kmod &>/dev/null && vercmp "$(modprobe --version | cut -d' ' -f3)" lt 3.7; then
        dfatal 'To use --kmoddir option module-init-tools >= 3.7 is required.'
        exit 1
    fi
    srcmods="$drivers_dir"
}
export srcmods

[[ $DRACUT_FIRMWARE_PATH ]] || export DRACUT_FIRMWARE_PATH="/lib/firmware/updates:/lib/firmware:/lib/firmware/$kernel"

# export standard hookdirs
[[ $hookdirs ]] || {
    hookdirs="cmdline pre-udev pre-trigger netroot "
    hookdirs+="initqueue initqueue/settled initqueue/online initqueue/finished initqueue/timeout "
    hookdirs+="pre-mount pre-pivot cleanup mount "
    hookdirs+="emergency shutdown-emergency pre-shutdown shutdown "
    export hookdirs
}

DRACUT_LDD=${DRACUT_LDD:-ldd}
DRACUT_TESTBIN=${DRACUT_TESTBIN:-/bin/sh}
DRACUT_LDCONFIG=${DRACUT_LDCONFIG:-ldconfig}

. $dracutbasedir/dracut-functions.sh

# Detect lib paths
if ! [[ $libdirs ]] ; then
    if [[ "$(ldd /bin/sh)" == */lib64/* ]] &>/dev/null \
        && [[ -d /lib64 ]]; then
        libdirs+=" /lib64"
        [[ -d /usr/lib64 ]] && libdirs+=" /usr/lib64"
    else
        libdirs+=" /lib"
        [[ -d /usr/lib ]] && libdirs+=" /usr/lib"
    fi

    libdirs+=" $(ldconfig_paths)"

    export libdirs
fi

# helper function for check() in module-setup.sh
# to check for required installed binaries
# issues a standardized warning message
require_binaries() {
    local _module_name="${moddir##*/}"
    local _ret=0

    if [[ "$1" = "-m" ]]; then
        _module_name="$2"
        shift 2
    fi

    for cmd in "$@"; do
        if ! find_binary "$cmd" &>/dev/null; then
            dinfo "dracut module '${_module_name#[0-9][0-9]}' will not be installed, because command '$cmd' could not be found!"
            ((_ret++))
        fi
    done
    return $_ret
}

require_any_binary() {
    local _module_name="${moddir##*/}"
    local _ret=1

    if [[ "$1" = "-m" ]]; then
        _module_name="$2"
        shift 2
    fi

    for cmd in "$@"; do
        if find_binary "$cmd" &>/dev/null; then
            _ret=0
            break
        fi
    done

    if (( $_ret != 0 )); then
        dinfo "$_module_name: Could not find any command of '$@'!"
        return 1
    fi

    return 0
}

dracut_need_initqueue() {
    >"$initdir/lib/dracut/need-initqueue"
}

dracut_module_included() {
    [[ " $mods_to_load $modules_loaded " == *\ $*\ * ]]
}

dracut_no_switch_root() {
    >"$initdir/lib/dracut/no-switch-root"
}

dracut_module_path() {
    echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; }
}

if ! [[ $DRACUT_INSTALL ]]; then
    DRACUT_INSTALL=$(find_binary dracut-install)
fi

if ! [[ $DRACUT_INSTALL ]] && [[ -x $dracutbasedir/dracut-install ]]; then
    DRACUT_INSTALL=$dracutbasedir/dracut-install
elif ! [[ $DRACUT_INSTALL ]] && [[ -x $dracutbasedir/install/dracut-install ]]; then
    DRACUT_INSTALL=$dracutbasedir/install/dracut-install
fi

if ! [[ -x $DRACUT_INSTALL ]]; then
    dfatal "dracut-install not found!"
    exit 10
fi

if [[ $hostonly == "-h" ]]; then
    if ! [[ $DRACUT_KERNEL_MODALIASES ]] || ! [[ -f "$DRACUT_KERNEL_MODALIASES" ]]; then
        export DRACUT_KERNEL_MODALIASES="${DRACUT_TMPDIR}/modaliases"
        $DRACUT_INSTALL ${srcmods:+--kerneldir "$srcmods"} --modalias > "$DRACUT_KERNEL_MODALIASES"
    fi
fi

[[ $DRACUT_RESOLVE_LAZY ]] || export DRACUT_RESOLVE_DEPS=1
inst_dir() {
    [[ -e ${initdir}/"$1" ]] && return 0  # already there
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} -d "$@"
    (($? != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} -d "$@" || :
}

inst() {
    local _hostonly_install
    if [[ "$1" == "-H" ]]; then
        _hostonly_install="-H"
        shift
    fi
    [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l} ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@"
    (($? != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l} ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
}

inst_simple() {
    local _hostonly_install
    if [[ "$1" == "-H" ]]; then
        _hostonly_install="-H"
        shift
    fi
    [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
    [[ -e $1 ]] || return 1  # no source
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${_hostonly_install:+-H} "$@"
    (($? != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${_hostonly_install:+-H} "$@" || :
}

inst_symlink() {
    local _hostonly_install
    if [[ "$1" == "-H" ]]; then
        _hostonly_install="-H"
        shift
    fi
    [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
    [[ -L $1 ]] || return 1
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@"
    (($? != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
}

inst_multiple() {
    local _ret
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} -a ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@"
    _ret=$?
    (($_ret != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} -a ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
    return $_ret
}

dracut_install() {
    inst_multiple "$@"
}

dracut_instmods() {
    local _silent=0;
    local i;
    [[ $no_kernel = yes ]] && return
    for i in "$@"; do
        [[ $i == "--silent" ]] && _silent=1
    done

    $DRACUT_INSTALL \
        ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${hostonly:+-H} ${omit_drivers:+-N "$omit_drivers"} ${srcmods:+--kerneldir "$srcmods"} -m "$@"
    (($? != 0)) && (($_silent == 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${hostonly:+-H} ${omit_drivers:+-N "$omit_drivers"} ${srcmods:+--kerneldir "$srcmods"} -m "$@" || :
}

inst_library() {
    local _hostonly_install
    if [[ "$1" == "-H" ]]; then
        _hostonly_install="-H"
        shift
    fi
    [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
    [[ -e $1 ]] || return 1  # no source
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@"
    (($? != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
}

inst_binary() {
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@"
    (($? != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@" || :
}

inst_script() {
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l} ${DRACUT_FIPS_MODE:+-f} "$@"
    (($? != 0)) && derror FAILED: $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@" || :
}

inst_fsck_help() {
    local _helper="/run/dracut/fsck/fsck_help_$1.txt"
    $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l} ${DRACUT_FIPS_MODE:+-f} "$2" $_helper
    (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$2" $_helper || :
}

# Use with form hostonly="$(optional_hostonly)" inst_xxxx <args>
# If hosotnly mode is set to "strict", hostonly restrictions will still
# be applied, else will ignore hostonly mode and try to install all
# given modules.
optional_hostonly() {
    if [[ $hostonly_mode = "strict" ]]; then
        printf -- "$hostonly"
    else
        printf ""
    fi
}

mark_hostonly() {
    for i in "$@"; do
        echo "$i" >> "$initdir/lib/dracut/hostonly-files"
    done
}

# find symlinks linked to given library file
# $1 = library file
# Function searches for symlinks by stripping version numbers appended to
# library filename, checks if it points to the same target and finally
# prints the list of symlinks to stdout.
#
# Example:
# rev_lib_symlinks libfoo.so.8.1
# output: libfoo.so.8 libfoo.so
# (Only if libfoo.so.8 and libfoo.so exists on host system.)
rev_lib_symlinks() {
    [[ ! $1 ]] && return 0

    local fn="$1" orig="$(readlink -f "$1")" links=''

    [[ ${fn} == *.so.* ]] || return 1

    until [[ ${fn##*.} == so ]]; do
        fn="${fn%.*}"
        [[ -L ${fn} && $(readlink -f "${fn}") == ${orig} ]] && links+=" ${fn}"
    done

    echo "${links}"
}

# attempt to install any programs specified in a udev rule
inst_rule_programs() {
    local _prog _bin

    for _prog in $(sed -nr 's/.*PROGRAM==?"([^ "]+).*/\1/p' "$1"); do
        _bin=""
        if [ -x ${udevdir}/$_prog ]; then
            _bin=${udevdir}/$_prog
        elif [[ "${_prog/\$env\{/}" == "$_prog" ]]; then
            _bin=$(find_binary "$_prog") || {
                dinfo "Skipping program $_prog using in udev rule ${1##*/} as it cannot be found"
                continue;
            }
        fi

        [[ $_bin ]] && inst_binary "$_bin"
    done
    for _prog in $(sed -nr 's/.*RUN[+=]=?"([^ "]+).*/\1/p' "$1"); do
        _bin=""
        if [ -x ${udevdir}/$_prog ]; then
            _bin=${udevdir}/$_prog
        elif [[ "${_prog/\$env\{/}" == "$_prog" ]] && [[ "${_prog}" != "/sbin/initqueue" ]]; then
            _bin=$(find_binary "$_prog") || {
                dinfo "Skipping program $_prog using in udev rule ${1##*/} as it cannot be found"
                continue;
            }
        fi

        [[ $_bin ]] && inst_binary "$_bin"
    done
    for _prog in $(sed -nr 's/.*IMPORT\{program\}==?"([^ "]+).*/\1/p' "$1"); do
        _bin=""
        if [ -x ${udevdir}/$_prog ]; then
            _bin=${udevdir}/$_prog
        elif [[ "${_prog/\$env\{/}" == "$_prog" ]]; then
            _bin=$(find_binary "$_prog") || {
                dinfo "Skipping program $_prog using in udev rule ${1##*/} as it cannot be found"
                continue;
            }
        fi

        [[ $_bin ]] && dracut_install "$_bin"
    done
}

# attempt to install any programs specified in a udev rule
inst_rule_group_owner() {
    local i

    for i in $(sed -nr 's/.*OWNER=?"([^ "]+).*/\1/p' "$1"); do
        if ! grep -Eq "^$i:" "$initdir/etc/passwd" 2>/dev/null; then
            grep -E "^$i:" /etc/passwd 2>/dev/null >> "$initdir/etc/passwd"
        fi
    done
    for i in $(sed -nr 's/.*GROUP=?"([^ "]+).*/\1/p' "$1"); do
        if ! grep -Eq "^$i:" "$initdir/etc/group" 2>/dev/null; then
            grep -E "^$i:" /etc/group 2>/dev/null >> "$initdir/etc/group"
        fi
    done
}

inst_rule_initqueue() {
    if grep -q -F initqueue "$1"; then
        dracut_need_initqueue
    fi
}

# udev rules always get installed in the same place, so
# create a function to install them to make life simpler.
inst_rules() {
    local _target=/etc/udev/rules.d _rule _found

    inst_dir "${udevdir}/rules.d"
    inst_dir "$_target"
    for _rule in "$@"; do
        if [ "${_rule#/}" = "$_rule" ]; then
            for r in ${udevdir}/rules.d ${hostonly:+/etc/udev/rules.d}; do
                [[ -e $r/$_rule ]] || continue
                _found="$r/$_rule"
                inst_rule_programs "$_found"
                inst_rule_group_owner "$_found"
                inst_rule_initqueue "$_found"
                inst_simple "$_found"
            done
        fi
        for r in '' $dracutbasedir/rules.d/; do
            # skip rules without an absolute path
            [[ "${r}$_rule" != /* ]] && continue
            [[ -f ${r}$_rule ]] || continue
            _found="${r}$_rule"
            inst_rule_programs "$_found"
            inst_rule_group_owner "$_found"
            inst_rule_initqueue "$_found"
            inst_simple "$_found" "$_target/${_found##*/}"
        done
        [[ $_found ]] || dinfo "Skipping udev rule: $_rule"
    done
}

inst_rules_wildcard() {
    local _target=/etc/udev/rules.d _rule _found

    inst_dir "${udevdir}/rules.d"
    inst_dir "$_target"
    for _rule in ${udevdir}/rules.d/$1 ${dracutbasedir}/rules.d/$1 ; do
        [[ -e $_rule ]] || continue
        inst_rule_programs "$_rule"
        inst_rule_group_owner "$_rule"
        inst_rule_initqueue "$_rule"
        inst_simple "$_rule"
        _found=$_rule
    done
    if [[ -n ${hostonly} ]] ; then
        for _rule in ${_target}/$1 ; do
            [[ -f $_rule ]] || continue
            inst_rule_programs "$_rule"
            inst_rule_group_owner "$_rule"
            inst_rule_initqueue "$_rule"
            inst_simple "$_rule"
            _found=$_rule
        done
    fi
    [[ $_found ]] || dinfo "Skipping udev rule: $_rule"
}

# make sure that library links are correct and up to date
build_ld_cache() {
    for f in "$dracutsysrootdir"/etc/ld.so.conf "$dracutsysrootdir"/etc/ld.so.conf.d/*; do
        [[ -f $f ]] && inst_simple "${f#$dracutsysrootdir}"
    done
    if ! ldconfig -r "$initdir" -f /etc/ld.so.conf; then
        if [[ $EUID == 0 ]]; then
            derror "ldconfig exited ungracefully"
        else
            derror "ldconfig might need uid=0 (root) for chroot()"
        fi
    fi
}

prepare_udev_rules() {
    [ -z "$UDEVVERSION" ] && export UDEVVERSION=$(udevadm --version | { read v _ ; echo $v ; })

    for f in "$@"; do
        f="${initdir}/etc/udev/rules.d/$f"
        [ -e "$f" ] || continue
        while read line || [ -n "$line" ]; do
            if [ "${line%%IMPORT PATH_ID}" != "$line" ]; then
                if [ $UDEVVERSION -ge 174 ]; then
                    printf '%sIMPORT{builtin}="path_id"\n' "${line%%IMPORT PATH_ID}"
                else
                    printf '%sIMPORT{program}="path_id %%p"\n' "${line%%IMPORT PATH_ID}"
                fi
            elif [ "${line%%IMPORT BLKID}" != "$line" ]; then
                if [ $UDEVVERSION -ge 176 ]; then
                    printf '%sIMPORT{builtin}="blkid"\n' "${line%%IMPORT BLKID}"
                else
                    printf '%sIMPORT{program}="/sbin/blkid -o udev -p $tempnode"\n' "${line%%IMPORT BLKID}"
                fi
            else
                echo "$line"
            fi
        done < "${f}" > "${f}.new"
        mv "${f}.new" "$f"
    done
}

# install function specialized for hooks
# $1 = type of hook, $2 = hook priority (lower runs first), $3 = hook
# All hooks should be POSIX/SuS compliant, they will be sourced by init.
inst_hook() {
    if ! [[ -f $3 ]]; then
        dfatal "Cannot install a hook ($3) that does not exist."
        dfatal "Aborting initrd creation."
        exit 1
    elif ! [[ "$hookdirs" == *$1* ]]; then
        dfatal "No such hook type $1. Aborting initrd creation."
        exit 1
    fi
    inst_simple "$3" "/lib/dracut/hooks/${1}/${2}-${3##*/}"
}

# install any of listed files
#
# If first argument is '-d' and second some destination path, first accessible
# source is installed into this path, otherwise it will installed in the same
# path as source.  If none of listed files was installed, function return 1.
# On first successful installation it returns with 0 status.
#
# Example:
#
# inst_any -d /bin/foo /bin/bar /bin/baz
#
# Lets assume that /bin/baz exists, so it will be installed as /bin/foo in
# initramfs.
inst_any() {
    local to f

    [[ $1 = '-d' ]] && to="$2" && shift 2

    for f in "$@"; do
        [[ -e $f ]] || continue
        [[ $to ]] && inst "$f" "$to" && return 0
        inst "$f" && return 0
    done

    return 1
}


# inst_libdir_file [-n <pattern>] <file> [<file>...]
# Install a <file> located on a lib directory to the initramfs image
# -n <pattern> install matching files
inst_libdir_file() {
    local _files
    if [[ "$1" == "-n" ]]; then
        local _pattern=$2
        shift 2
        for _dir in $libdirs; do
            for _i in "$@"; do
                for _f in "$_dir"/$_i; do
                    [[ "$_f" =~ $_pattern ]] || continue
                    [[ -e "$_f" ]] && _files+="$_f "
                done
            done
        done
    else
        for _dir in $libdirs; do
            for _i in "$@"; do
                for _f in "$_dir"/$_i; do
                    [[ -e "$_f" ]] && _files+="$_f "
                done
            done
        done
    fi
    [[ $_files ]] && inst_multiple $_files
}


# install function decompressing the target and handling symlinks
# $@ = list of compressed (gz or bz2) files or symlinks pointing to such files
#
# Function install targets in the same paths inside overlay but decompressed
# and without extensions (.gz, .bz2).
inst_decompress() {
    local _src _cmd

    for _src in $@
    do
        case ${_src} in
            *.gz) _cmd='gzip -f -d' ;;
            *.bz2) _cmd='bzip2 -d' ;;
            *) return 1 ;;
        esac
        inst_simple ${_src}
        # Decompress with chosen tool.  We assume that tool changes name e.g.
        # from 'name.gz' to 'name'.
        ${_cmd} "${initdir}${_src}"
    done
}

# It's similar to above, but if file is not compressed, performs standard
# install.
# $@ = list of files
inst_opt_decompress() {
    local _src

    for _src in $@; do
        inst_decompress "${_src}" || inst "${_src}"
    done
}

# module_check <dracut module>
# execute the check() function of module-setup.sh of <dracut module>
# or the "check" script, if module-setup.sh is not found
# "check $hostonly" is called
module_check() {
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    local _forced=0
    local _hostonly=$hostonly
    [ $# -eq 2 ] && _forced=$2
    [[ -d $_moddir ]] || return 1
    if [[ ! -f $_moddir/module-setup.sh ]]; then
        # if we do not have a check script, we are unconditionally included
        [[ -x $_moddir/check ]] || return 0
        [ $_forced -ne 0 ] && unset hostonly
        $_moddir/check $hostonly
        _ret=$?
    else
        unset check depends cmdline install installkernel
        check() { true; }
        . $_moddir/module-setup.sh
        is_func check || return 0
        [ $_forced -ne 0 ] && unset hostonly
        moddir=$_moddir check $hostonly
        _ret=$?
        unset check depends cmdline install installkernel
    fi
    hostonly=$_hostonly
    return $_ret
}

# module_check_mount <dracut module>
# execute the check() function of module-setup.sh of <dracut module>
# or the "check" script, if module-setup.sh is not found
# "mount_needs=1 check 0" is called
module_check_mount() {
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    mount_needs=1
    [[ -d $_moddir ]] || return 1
    if [[ ! -f $_moddir/module-setup.sh ]]; then
        # if we do not have a check script, we are unconditionally included
        [[ -x $_moddir/check ]] || return 0
        mount_needs=1 $_moddir/check 0
        _ret=$?
    else
        unset check depends cmdline install installkernel
        check() { false; }
        . $_moddir/module-setup.sh
        moddir=$_moddir check 0
        _ret=$?
        unset check depends cmdline install installkernel
    fi
    unset mount_needs
    return $_ret
}

# module_depends <dracut module>
# execute the depends() function of module-setup.sh of <dracut module>
# or the "depends" script, if module-setup.sh is not found
module_depends() {
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    [[ -d $_moddir ]] || return 1
    if [[ ! -f $_moddir/module-setup.sh ]]; then
        # if we do not have a check script, we have no deps
        [[ -x $_moddir/check ]] || return 0
        $_moddir/check -d
        return $?
    else
        unset check depends cmdline install installkernel
        depends() { true; }
        . $_moddir/module-setup.sh
        moddir=$_moddir depends
        _ret=$?
        unset check depends cmdline install installkernel
        return $_ret
    fi
}

# module_cmdline <dracut module>
# execute the cmdline() function of module-setup.sh of <dracut module>
# or the "cmdline" script, if module-setup.sh is not found
module_cmdline() {
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    [[ -d $_moddir ]] || return 1
    if [[ ! -f $_moddir/module-setup.sh ]]; then
        [[ -x $_moddir/cmdline ]] && . "$_moddir/cmdline"
        return $?
    else
        unset check depends cmdline install installkernel
        cmdline() { true; }
        . $_moddir/module-setup.sh
        moddir=$_moddir cmdline
        _ret=$?
        unset check depends cmdline install installkernel
        return $_ret
    fi
}

# module_install <dracut module>
# execute the install() function of module-setup.sh of <dracut module>
# or the "install" script, if module-setup.sh is not found
module_install() {
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    [[ -d $_moddir ]] || return 1
    if [[ ! -f $_moddir/module-setup.sh ]]; then
        [[ -x $_moddir/install ]] && . "$_moddir/install"
        return $?
    else
        unset check depends cmdline install installkernel
        install() { true; }
        . $_moddir/module-setup.sh
        moddir=$_moddir install
        _ret=$?
        unset check depends cmdline install installkernel
        return $_ret
    fi
}

# module_installkernel <dracut module>
# execute the installkernel() function of module-setup.sh of <dracut module>
# or the "installkernel" script, if module-setup.sh is not found
module_installkernel() {
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    [[ -d $_moddir ]] || return 1
    if [[ ! -f $_moddir/module-setup.sh ]]; then
        [[ -x $_moddir/installkernel ]] && . "$_moddir/installkernel"
        return $?
    else
        unset check depends cmdline install installkernel
        installkernel() { true; }
        . $_moddir/module-setup.sh
        moddir=$_moddir installkernel
        _ret=$?
        unset check depends cmdline install installkernel
        return $_ret
    fi
}

# check_mount <dracut module>
# check_mount checks, if a dracut module is needed for the given
# device and filesystem types in "${host_fs_types[@]}"
check_mount() {
    local _mod=$1
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    local _moddep

    [ "${#host_fs_types[@]}" -le 0 ] && return 1

    # If we are already scheduled to be loaded, no need to check again.
    [[ " $mods_to_load " == *\ $_mod\ * ]] && return 0
    [[ " $mods_checked_as_dep " == *\ $_mod\ * ]] && return 1

    # This should never happen, but...
    [[ -d $_moddir ]] || return 1

    [[ $2 ]] || mods_checked_as_dep+=" $_mod "

    if [[ " $omit_dracutmodules " == *\ $_mod\ * ]]; then
        return 1
    fi

    if [[ " $dracutmodules $add_dracutmodules $force_add_dracutmodules" == *\ $_mod\ * ]]; then
        module_check_mount $_mod; ret=$?

        # explicit module, so also accept ret=255
        [[ $ret = 0 || $ret = 255 ]] || return 1
    else
        # module not in our list
        if [[ $dracutmodules = all ]]; then
            # check, if we can and should install this module
            module_check_mount $_mod || return 1
        else
            # skip this module
            return 1
        fi
    fi

    for _moddep in $(module_depends $_mod); do
        # handle deps as if they were manually added
        [[ " $dracutmodules " == *\ $_mod\ * ]] \
            && [[ " $dracutmodules " != *\ $_moddep\ * ]] \
            && dracutmodules+=" $_moddep "
        [[ " $add_dracutmodules " == *\ $_mod\ * ]] \
            && [[ " $add_dracutmodules " != *\ $_moddep\ * ]] \
            && add_dracutmodules+=" $_moddep "
        [[ " $force_add_dracutmodules " == *\ $_mod\ * ]] \
            && [[ " $force_add_dracutmodules " != *\ $_moddep\ * ]] \
            && force_add_dracutmodules+=" $_moddep "
        # if a module we depend on fail, fail also
        if ! check_module $_moddep; then
            derror "dracut module '$_mod' depends on '$_moddep', which can't be installed"
            return 1
        fi
    done

    [[ " $mods_to_load " == *\ $_mod\ * ]] || \
        mods_to_load+=" $_mod "

    return 0
}

# check_module <dracut module> [<use_as_dep>]
# check if a dracut module is to be used in the initramfs process
# if <use_as_dep> is set, then the process also keeps track
# that the modules were checked for the dependency tracking process
check_module() {
    local _mod=$1
    local _moddir=$(echo ${dracutbasedir}/modules.d/??${1} | { read a b; echo "$a"; })
    local _ret
    local _moddep
    # If we are already scheduled to be loaded, no need to check again.
    [[ " $mods_to_load " == *\ $_mod\ * ]] && return 0
    [[ " $mods_checked_as_dep " == *\ $_mod\ * ]] && return 1

    # This should never happen, but...
    [[ -d $_moddir ]] || return 1

    [[ $2 ]] || mods_checked_as_dep+=" $_mod "

    if [[ " $omit_dracutmodules " == *\ $_mod\ * ]]; then
        dinfo "dracut module '$_mod' will not be installed, because it's in the list to be omitted!"
        return 1
    fi

    if [[ " $dracutmodules $add_dracutmodules $force_add_dracutmodules" == *\ $_mod\ * ]]; then
        if [[ " $dracutmodules $force_add_dracutmodules " == *\ $_mod\ * ]]; then
            module_check $_mod 1; ret=$?
        else
            module_check $_mod 0; ret=$?
        fi
        # explicit module, so also accept ret=255
        [[ $ret = 0 || $ret = 255 ]] || return 1
    else
        # module not in our list
        if [[ $dracutmodules = all ]]; then
            # check, if we can and should install this module
            module_check $_mod; ret=$?
            if [[ $ret != 0 ]]; then
                [[ $2 ]] && return 1
                [[ $ret != 255 ]] && return 1
            fi
        else
            # skip this module
            return 1
        fi
    fi

    for _moddep in $(module_depends $_mod); do
        # handle deps as if they were manually added
        [[ " $dracutmodules " == *\ $_mod\ * ]] \
            && [[ " $dracutmodules " != *\ $_moddep\ * ]] \
            && dracutmodules+=" $_moddep "
        [[ " $add_dracutmodules " == *\ $_mod\ * ]] \
            && [[ " $add_dracutmodules " != *\ $_moddep\ * ]] \
            && add_dracutmodules+=" $_moddep "
        [[ " $force_add_dracutmodules " == *\ $_mod\ * ]] \
            && [[ " $force_add_dracutmodules " != *\ $_moddep\ * ]] \
            && force_add_dracutmodules+=" $_moddep "
        # if a module we depend on fail, fail also
        if ! check_module $_moddep; then
            derror "dracut module '$_mod' depends on '$_moddep', which can't be installed"
            return 1
        fi
    done

    [[ " $mods_to_load " == *\ $_mod\ * ]] || \
        mods_to_load+=" $_mod "

    return 0
}

# for_each_module_dir <func>
# execute "<func> <dracut module> 1"
for_each_module_dir() {
    local _modcheck
    local _mod
    local _moddir
    local _func
    _func=$1
    for _moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
        [[ -d $_moddir ]] || continue;
        [[ -e $_moddir/install || -e $_moddir/installkernel || \
            -e $_moddir/module-setup.sh ]] || continue
        _mod=${_moddir##*/}; _mod=${_mod#[0-9][0-9]}
        $_func $_mod 1
    done

    # Report any missing dracut modules, the user has specified
    _modcheck="$add_dracutmodules $force_add_dracutmodules"
    [[ $dracutmodules != all ]] && _modcheck="$_modcheck $dracutmodules"
    for _mod in $_modcheck; do
        [[ " $mods_to_load " == *\ $_mod\ * ]] && continue

        [[ " $force_add_dracutmodules " != *\ $_mod\ * ]] \
            && [[ " $dracutmodules " != *\ $_mod\ * ]] \
            && [[ " $omit_dracutmodules " == *\ $_mod\ * ]] \
            && continue

        derror "dracut module '$_mod' cannot be found or installed."
        [[ " $force_add_dracutmodules " == *\ $_mod\ * ]] && exit 1
        [[ " $dracutmodules " == *\ $_mod\ * ]] && exit 1
        [[ " $add_dracutmodules " == *\ $_mod\ * ]] && exit 1
    done
}

# Install a single kernel module along with any firmware it may require.
# $1 = full path to kernel module to install
install_kmod_with_fw() {
    # no need to go further if the module is already installed

    [[ -e "${initdir}/lib/modules/$kernel/${1##*/lib/modules/$kernel/}" ]] \
        && return 0

    if [[ $omit_drivers ]]; then
        local _kmod=${1##*/}
        _kmod=${_kmod%.ko*}
        _kmod=${_kmod/-/_}
        if [[ "$_kmod" =~ $omit_drivers ]]; then
            dinfo "Omitting driver $_kmod"
            return 0
        fi
        if [[ "${1##*/lib/modules/$kernel/}" =~ $omit_drivers ]]; then
            dinfo "Omitting driver $_kmod"
            return 0
        fi
    fi

    if [[ $silent_omit_drivers ]]; then
        local _kmod=${1##*/}
        _kmod=${_kmod%.ko*}
        _kmod=${_kmod/-/_}
        [[ "$_kmod" =~ $silent_omit_drivers ]] && return 0
        [[ "${1##*/lib/modules/$kernel/}" =~ $silent_omit_drivers ]] && return 0
    fi

    inst_simple "$1" "/lib/modules/$kernel/${1##*/lib/modules/$kernel/}"
    ret=$?
    (($ret != 0)) && return $ret

    local _modname=${1##*/} _fwdir _found _fw
    _modname=${_modname%.ko*}
    for _fw in $(modinfo -k $kernel -F firmware $1 2>/dev/null); do
        _found=''
        for _fwdir in $fw_dir; do
            [[ -d $_fwdir && -f $_fwdir/$_fw ]] || continue
            inst_simple "$_fwdir/$_fw" "/lib/firmware/$_fw"
            _found=yes
        done
        if [[ $_found != yes ]]; then
            if ! [[ -d $(echo /sys/module/${_modname//-/_}|{ read a b; echo $a; }) ]]; then
                dinfo "Possible missing firmware \"${_fw}\" for kernel module" \
                    "\"${_modname}.ko\""
            else
                dwarn "Possible missing firmware \"${_fw}\" for kernel module" \
                    "\"${_modname}.ko\""
            fi
        fi
    done
    return 0
}

# Do something with all the dependencies of a kernel module.
# Note that kernel modules depend on themselves using the technique we use
# $1 = function to call for each dependency we find
#      It will be passed the full path to the found kernel module
# $2 = module to get dependencies for
# rest of args = arguments to modprobe
# _fderr specifies FD passed from surrounding scope
for_each_kmod_dep() {
    local _func=$1 _kmod=$2 _cmd _modpath _options
    shift 2
    modprobe "$@" --ignore-install --show-depends $_kmod 2>&${_fderr} | (
        while read _cmd _modpath _options || [ -n "$_cmd" ]; do
            [[ $_cmd = insmod ]] || continue
            $_func ${_modpath} || exit $?
        done
    )
}

dracut_kernel_post() {
    for _f in modules.builtin.bin modules.builtin modules.order; do
        [[ -e $srcmods/$_f ]] && inst_simple "$srcmods/$_f" "/lib/modules/$kernel/$_f"
    done

    # generate module dependencies for the initrd
    if [[ -d $initdir/lib/modules/$kernel ]] && \
        ! depmod -a -b "$initdir" $kernel; then
        dfatal "\"depmod -a $kernel\" failed."
        exit 1
    fi

}

instmods() {
    # instmods [-c [-s]] <kernel module> [<kernel module> ... ]
    # instmods [-c [-s]] <kernel subsystem>
    # install kernel modules along with all their dependencies.
    # <kernel subsystem> can be e.g. "=block" or "=drivers/usb/storage"
    # -c check
    # -s silent
    local _optional="-o"
    local _silent
    local _ret

    [[ $no_kernel = yes ]] && return

    if [[ $1 = '-c' ]]; then
        unset _optional
        shift
    fi
    if [[ $1 = '-s' ]]; then
        _silent=1
        shift
    fi

    if (($# == 0)); then
        read -r -d '' -a args
        set -- "${args[@]}"
    fi

    if (($# == 0)); then
        return 0
    fi

    $DRACUT_INSTALL \
        ${initdir:+-D "$initdir"} \
        ${loginstall:+-L "$loginstall"} \
        ${hostonly:+-H} \
        ${omit_drivers:+-N "$omit_drivers"} \
        ${srcmods:+--kerneldir "$srcmods"} \
        ${_optional:+-o} \
        ${_silent:+--silent} \
        -m "$@"
    _ret=$?

    if (($_ret != 0)) && [[ -z "$_silent" ]]; then
        derror "FAILED: " \
            $DRACUT_INSTALL \
                ${initdir:+-D "$initdir"} \
                ${loginstall:+-L "$loginstall"} \
                ${hostonly:+-H} \
                ${omit_drivers:+-N "$omit_drivers"} \
                ${srcmods:+--kerneldir "$srcmods"} \
                ${_optional:+-o} \
                ${_silent:+--silent} \
                -m "$@"
    fi

    [[ "$optional" ]] && return 0
    return $_ret
}

if [[ "$(ln --help)" == *--relative* ]]; then
    ln_r() {
        ln -sfnr "${initdir}/$1" "${initdir}/$2"
    }
else
    ln_r() {
        local _source=$1
        local _dest=$2
        [[ -d "${_dest%/*}" ]] && _dest=$(readlink -f "${_dest%/*}")/${_dest##*/}
        ln -sfn -- "$(convert_abs_rel "${_dest}" "${_source}")" "${initdir}/${_dest}"
    }
fi

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