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#!/bin/bash
#
# inst bits ruthlessly and viciously stolen from dracut

[ -z "$DESTDIR" ] || exit 0

[ -z "$PLYMOUTH_LIBEXECDIR" ] && PLYMOUTH_LIBEXECDIR="/usr/libexec"
[ -z "$PLYMOUTH_DATADIR" ] && PLYMOUTH_DATADIR="/usr/share"
[ -z "$PLYMOUTH_PLUGIN_PATH" ] && PLYMOUTH_PLUGIN_PATH="$(plymouth --get-splash-plugin-path)"
[ -z "$PLYMOUTH_LOGO_FILE" ] && PLYMOUTH_LOGO_FILE="/usr/share/pixmaps/system-logo-white.png"
[ -n "$PLYMOUTH_THEME_NAME" ] && THEME_OVERRIDE=1
[ -z "$PLYMOUTH_THEME_NAME" ] && PLYMOUTH_THEME_NAME=$(plymouth-set-default-theme)
[ -z "$PLYMOUTH_CONFDIR" ] && PLYMOUTH_CONFDIR="/etc/plymouth/"
[ -z "$PLYMOUTH_POLICYDIR" ] && PLYMOUTH_POLICYDIR="/usr/share/plymouth/"
[ -z "$PLYMOUTH_DAEMON_PATH" ] && PLYMOUTH_DAEMON_PATH="/usr/sbin/plymouthd"
[ -z "$PLYMOUTH_CLIENT_PATH" ] && PLYMOUTH_CLIENT_PATH="/usr/bin/plymouth"
[ -z "$SYSTEMD_UNIT_DIR" ] && SYSTEMD_UNIT_DIR="/usr/lib/systemd/system"
[ -z "$SUPPORTED_LANGUAGES" ] && SUPPORTED_LANGUAGES="pt fr de it ru es en zh ja ko zh as bn gu hi kn ml mr or pa ta te"

# Generic substring function.  If $2 is in $1, return 0.
strstr() { [ "${1#*$2*}" != "$1" ]; }

ddebug() {
    [ "$verbose" = "true" ] && echo "$@"
}

# normalize_path <path>
# Prints the normalized path, where it removes any duplicated
# and trailing slashes.
# Example:
# $ normalize_path ///test/test//
# /test/test
normalize_path() {
    shopt -q -s extglob
    set -- "${1//+(\/)//}"
    shopt -q -u extglob
    echo "${1%/}"
}

# convert_abs_rel <from> <to>
# Prints the relative path, when creating a symlink to <to> from <from>.
# Example:
# $ convert_abs_rel /usr/bin/test /bin/test-2
# ../../bin/test-2
# $ ln -s $(convert_abs_rel /usr/bin/test /bin/test-2) /usr/bin/test
convert_abs_rel() {
    local __current __absolute __abssize __cursize __newpath
    local -i __i __level

    set -- "$(normalize_path "$1")" "$(normalize_path "$2")"

    # corner case #1 - self looping link
    [[ "$1" == "$2" ]] && { echo "${1##*/}"; return; }

    # corner case #2 - own dir link
    [[ "${1%/*}" == "$2" ]] && { echo "."; return; }

    IFS="/" __current=($1)
    IFS="/" __absolute=($2)

    __abssize=${#__absolute[@]}
    __cursize=${#__current[@]}

    while [[ ${__absolute[__level]} == ${__current[__level]} ]]
    do
        (( __level++ ))
        if (( __level > __abssize || __level > __cursize ))
        then
            break
        fi
    done

    for ((__i = __level; __i < __cursize-1; __i++))
    do
        if ((__i > __level))
        then
            __newpath=$__newpath"/"
        fi
        __newpath=$__newpath".."
    done

    for ((__i = __level; __i < __abssize; __i++))
    do
        if [[ -n $__newpath ]]
        then
            __newpath=$__newpath"/"
        fi
        __newpath=$__newpath${__absolute[__i]}
    done

    echo "$__newpath"
}

# Install a directory, keeping symlinks as on the original system.
# Example: if /lib points to /lib64 on the host, "inst_dir /lib/file"
# will create ${initdir}/lib64, ${initdir}/lib64/file,
# and a symlink ${initdir}/lib -> lib64.
inst_dir() {
    [[ -e ${initdir}/"$1" ]] && return 0  # already there

    local _dir="$1" _part="${1%/*}" _file
    while [[ "$_part" != "${_part%/*}" ]] && ! [[ -e "${initdir}/${_part}" ]]; do
        _dir="$_part $_dir"
        _part=${_part%/*}
    done

    # iterate over parent directories
    for _file in $_dir; do
        [[ -e "${initdir}/$_file" ]] && continue
        if [[ -L $_file ]]; then
            inst_symlink "$_file"
        else
            # create directory
            mkdir -m 0755 -p "${initdir}/$_file" || return 1
            [[ -e "$_file" ]] && chmod --reference="$_file" "${initdir}/$_file"
            chmod u+w "${initdir}/$_file"
        fi
    done
}

# $1 = file to copy to ramdisk
# $2 (optional) Name for the file on the ramdisk
# Location of the image dir is assumed to be $initdir
# We never overwrite the target if it exists.
inst_simple() {
    [[ -f "$1" ]] || return 1
    strstr "$1" "/" || return 1

    local _src=$1 target="${2:-$1}"
    if ! [[ -d ${initdir}/$target ]]; then
        [[ -e ${initdir}/$target ]] && return 0
        [[ -L ${initdir}/$target ]] && return 0
        [[ -d "${initdir}/${target%/*}" ]] || inst_dir "${target%/*}"
    fi
    # install checksum files also
    if [[ -e "${_src%/*}/.${_src##*/}.hmac" ]]; then
        inst "${_src%/*}/.${_src##*/}.hmac" "${target%/*}/.${target##*/}.hmac"
    fi
    ddebug "Installing $_src"
    cp --sparse=always -pfL "$_src" "${initdir}/$target"
}

# 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}"
}

# Same as above, but specialized to handle dynamic libraries.
# It handles making symlinks according to how the original library
# is referenced.
inst_library() {
    local _src="$1" _dest=${2:-$1} _lib _reallib _symlink
    strstr "$1" "/" || return 1
    [[ -e $initdir/$_dest ]] && return 0
    if [[ -L $_src ]]; then
        # install checksum files also
        if [[ -e "${_src%/*}/.${_src##*/}.hmac" ]]; then
            inst "${_src%/*}/.${_src##*/}.hmac" "${_dest%/*}/.${_dest##*/}.hmac"
        fi
        _reallib=$(readlink -f "$_src")
        inst_simple "$_reallib" "$_reallib"
        inst_dir "${_dest%/*}"
        [[ -d "${_dest%/*}" ]] && _dest=$(readlink -f "${_dest%/*}")/${_dest##*/}
        ln -sfn $(convert_abs_rel "${_dest}" "${_reallib}") "${initdir}/${_dest}"
    else
        inst_simple "$_src" "$_dest"
    fi

    # Create additional symlinks.  See rev_symlinks description.
    for _symlink in $(rev_lib_symlinks $_src) $(rev_lib_symlinks $_reallib); do
        [[ ! -e $initdir/$_symlink ]] && {
            ddebug "Creating extra symlink: $_symlink"
            inst_symlink $_symlink
        }
    done
}

# find a binary.  If we were not passed the full path directly,
# search in the usual places to find the binary.
find_binary() {
    if [[ -z ${1##/*} ]]; then
        if [[ -x $1 ]] || { strstr "$1" ".so" && ldd $1 &>/dev/null; };  then
            echo $1
            return 0
        fi
    fi

    type -P $1
}

# Same as above, but specialized to install binary executables.
# Install binary executable, and all shared library dependencies, if any.
inst_binary() {
    local _bin _target
    _bin=$(find_binary "$1") || return 1
    _target=${2:-$_bin}
    [[ -e $initdir/$_target ]] && return 0
    [[ -L $_bin ]] && inst_symlink $_bin $_target && return 0
    local _file _line
    local _so_regex='([^ ]*/lib[^/]*/[^ ]*\.so[^ ]*)'
    # I love bash!
    LC_ALL=C ldd "$_bin" 2>/dev/null | while read _line; do
        [[ $_line = 'not a dynamic executable' ]] && break

        if [[ $_line =~ $_so_regex ]]; then
            _file=${BASH_REMATCH[1]}
            [[ -e ${initdir}/$_file ]] && continue
            inst_library "$_file"
            continue
        fi

        if [[ $_line =~ not\ found ]]; then
            dfatal "Missing a shared library required by $_bin."
            dfatal "Run \"ldd $_bin\" to find out what it is."
            dfatal "$_line"
            dfatal "dracut cannot create an initrd."
            exit 1
        fi
    done
    inst_simple "$_bin" "$_target"
}

# same as above, except for shell scripts.
# If your shell script does not start with shebang, it is not a shell script.
inst_script() {
    local _bin
    _bin=$(find_binary "$1") || return 1
    shift
    local _line _shebang_regex
    read -r -n 80 _line <"$_bin"
    # If debug is set, clean unprintable chars to prevent messing up the term
    [[ $debug ]] && _line=$(echo -n "$_line" | tr -c -d '[:print:][:space:]')
    _shebang_regex='(#! *)(/[^ ]+).*'
    [[ $_line =~ $_shebang_regex ]] || return 1
    inst "${BASH_REMATCH[2]}" && inst_simple "$_bin" "$@"
}

# same as above, but specialized for symlinks
inst_symlink() {
    local _src=$1 _target=${2:-$1} _realsrc
    strstr "$1" "/" || return 1
    [[ -L $1 ]] || return 1
    [[ -L $initdir/$_target ]] && return 0
    _realsrc=$(readlink -f "$_src")
    if ! [[ -e $initdir/$_realsrc ]]; then
        if [[ -d $_realsrc ]]; then
            inst_dir "$_realsrc"
        else
            inst "$_realsrc"
        fi
    fi
    [[ ! -e $initdir/${_target%/*} ]] && inst_dir "${_target%/*}"
    [[ -d ${_target%/*} ]] && _target=$(readlink -f ${_target%/*})/${_target##*/}
    ln -sfn $(convert_abs_rel "${_target}" "${_realsrc}") "$initdir/$_target"
}

# general purpose installation function
# Same args as above.
inst() {
    local _x

    case $# in
        1) ;;
        2) [[ ! $initdir && -d $2 ]] && export initdir=$2
            [[ $initdir = $2 ]] && set $1;;
        3) [[ -z $initdir ]] && export initdir=$2
            set $1 $3;;
        *) dfatal "inst only takes 1 or 2 or 3 arguments"
            exit 1;;
    esac
    for _x in inst_symlink inst_script inst_binary inst_simple; do
        $_x "$@" && return 0
    done
    return 1
}

# 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 ($3) that does not exist."
        dfatal "Aborting initrd creation."
        exit 1
    elif ! strstr "$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
        if [[ -e $f ]]; then
            [[ $to ]] && inst "$f" "$to" && return 0
            inst "$f" && return 0
        fi
    done

    return 1
}

function usage() {
    local output="/dev/stdout"
    local rc=0
    if [ "$1" == "error" ]; then
        output="/dev/stderr"
        rc=1
    fi

    echo "usage: plymouth [ --verbose | -v ] { --targetdir | -t } <initrd_directory>" > $output
    exit $rc
}

verbose=false
INITRDDIR=""
while [ $# -gt 0 ]; do
    case $1 in
        --verbose|-v)
            verbose=true
            ;;
        --targetdir|-t)
            shift
            INITRDDIR="$1"
            ;;
        --help|-h)
            usage normal
            ;;
        *)
            usage error
            break
            ;;
    esac
    shift
done

[ -z "$INITRDDIR" ] && usage error

mkdir -p ${INITRDDIR}${PLYMOUTH_DATADIR}/plymouth/themes
inst ${PLYMOUTH_DAEMON_PATH} $INITRDDIR /sbin/plymouthd
inst ${PLYMOUTH_CLIENT_PATH} $INITRDDIR /bin/plymouth
inst ${PLYMOUTH_DATADIR}/plymouth/themes/text/text.plymouth $INITRDDIR
inst ${PLYMOUTH_PLUGIN_PATH}/text.so $INITRDDIR
inst ${PLYMOUTH_DATADIR}/plymouth/themes/details/details.plymouth $INITRDDIR
inst ${PLYMOUTH_PLUGIN_PATH}/details.so $INITRDDIR
inst ${PLYMOUTH_LOGO_FILE} $INITRDDIR
inst /etc/os-release $INITRDDIR
inst ${PLYMOUTH_POLICYDIR}/plymouthd.defaults $INITRDDIR
inst ${PLYMOUTH_CONFDIR}/plymouthd.conf $INITRDDIR

if [ -z "$PLYMOUTH_THEME_NAME" ]; then
    echo "No default plymouth plugin is set" > /dev/stderr
    exit 1
fi

if [ $THEME_OVERRIDE ]; then
    conf=$INITRDDIR/${PLYMOUTH_CONFDIR}/plymouthd.conf
    echo "modifying plymouthd.conf: Theme=$PLYMOUTH_THEME_NAME" > /dev/stderr
    sed -i "s/^ *Theme *=.*/# theme modified by plymouth-populate-initrd\nTheme=$PLYMOUTH_THEME_NAME/" $conf
fi

PLYMOUTH_MODULE_NAME=$(grep "ModuleName *= *" ${PLYMOUTH_DATADIR}/plymouth/themes/${PLYMOUTH_THEME_NAME}/${PLYMOUTH_THEME_NAME}.plymouth | sed 's/ModuleName *= *//')

if [ ! -f ${PLYMOUTH_PLUGIN_PATH}/${PLYMOUTH_MODULE_NAME}.so ]; then
    echo "The default plymouth plugin (${PLYMOUTH_MODULE_NAME}) doesn't exist" > /dev/stderr
    exit 1
fi

inst ${PLYMOUTH_PLUGIN_PATH}/${PLYMOUTH_MODULE_NAME}.so $INITRDDIR

[ -f "${PLYMOUTH_PLUGIN_PATH}/renderers/drm.so" ] && inst ${PLYMOUTH_PLUGIN_PATH}/renderers/drm.so $INITRDDIR
inst ${PLYMOUTH_PLUGIN_PATH}/renderers/frame-buffer.so $INITRDDIR

if [ -d ${PLYMOUTH_DATADIR}/plymouth/themes/${PLYMOUTH_THEME_NAME} ]; then
    for x in ${PLYMOUTH_DATADIR}/plymouth/themes/${PLYMOUTH_THEME_NAME}/* ; do
        [ ! -f "$x" ] && continue
        inst $x $INITRDDIR
    done
fi

fonts=""
needs_graphics="$(find ${INITRDDIR} -name 'libply-splash-graphics.so*' -print -quit | grep -q libply-splash-graphics.so && echo -n 1)"

if [ -n "$needs_graphics" ]; then
    for lang in $SUPPORTED_LANGUAGES; do
        font=$(fc-match "":lang="$lang" file | awk -F= '{ print $2}')
        echo $fonts | grep -q "$font" && continue
        fonts="$fonts $font"
    done

    if [ -n "$fonts" ]; then
        inst ${PLYMOUTH_PLUGIN_PATH}/label.so $INITRDDIR
        for font in $fonts; do
            inst $font $INITRDDIR
        done
    fi
fi

if [ -L ${PLYMOUTH_DATADIR}/plymouth/themes/default.plymouth ]; then
    cp -a ${PLYMOUTH_DATADIR}/plymouth/themes/default.plymouth $INITRDDIR${PLYMOUTH_DATADIR}/plymouth/themes
fi

if [ -n "$SYSTEMD_UNIT_DIR" -a -d "$SYSTEMD_UNIT_DIR" ]; then
    inst $SYSTEMD_UNIT_DIR/systemd-ask-password-plymouth.path $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/systemd-ask-password-plymouth.service $INITRDDIR

    inst $SYSTEMD_UNIT_DIR/plymouth-switch-root.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/plymouth-start.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/plymouth-quit.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/plymouth-quit-wait.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/plymouth-reboot.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/plymouth-kexec.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/plymouth-poweroff.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/plymouth-halt.service $INITRDDIR

    inst $SYSTEMD_UNIT_DIR/initrd-switch-root.target.wants/plymouth-switch-root.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/initrd-switch-root.target.wants/plymouth-start.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/sysinit.target.wants/plymouth-start.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/multi-user.target.wants/plymouth-quit.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/multi-user.target.wants/plymouth-quit-wait.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/reboot.target.wants/plymouth-reboot.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/kexec.target.wants/plymouth-kexec.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/poweroff.target.wants/plymouth-poweroff.service $INITRDDIR
    inst $SYSTEMD_UNIT_DIR/halt.target.wants/plymouth-halt.service $INITRDDIR
fi

# vim:ts=8:sw=4:sts=4:et