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# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
#
# functions used by dracut and other tools.
#
# 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 [[ $DRACUT_KERNEL_LAZY ]] && ! [[ $DRACUT_KERNEL_LAZY_HASHDIR ]]; then
    if [[ -d "$initdir/.kernelmodseen" ]]; then
        DRACUT_KERNEL_LAZY_HASHDIR="$initdir/.kernelmodseen"
    fi
fi

# Generic substring function.  If $2 is in $1, return 0.
strstr() { [[ $1 = *$2* ]]; }
# returns OK if $1 contains literal string $2 at the beginning, and isn't empty
str_starts() { [ "${1#"$2"*}" != "$1" ]; }
# returns OK if $1 contains literal string $2 at the end, and isn't empty
str_ends() { [ "${1%*"$2"}" != "$1" ]; }

# 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
}

# 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 ]] || { [[ "$1" == *.so* ]] && ldd "$1" &>/dev/null; };  then
            printf "%s\n" "$1"
            return 0
        fi
    fi

    type -P "${1##*/}"
}

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

ldconfig_paths()
{
    ldconfig -pN 2>/dev/null | grep -E -v '/(lib|lib64|usr/lib|usr/lib64)/[^/]*$' | sed -n 's,.* => \(.*\)/.*,\1,p' | sort | uniq
}

# 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

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

# Version comparision function.  Assumes Linux style version scheme.
# $1 = version a
# $2 = comparision op (gt, ge, eq, le, lt, ne)
# $3 = version b
vercmp() {
    local _n1=(${1//./ }) _op=$2 _n2=(${3//./ }) _i _res

    for ((_i=0; ; _i++))
    do
        if [[ ! ${_n1[_i]}${_n2[_i]} ]]; then _res=0
        elif ((${_n1[_i]:-0} > ${_n2[_i]:-0})); then _res=1
        elif ((${_n1[_i]:-0} < ${_n2[_i]:-0})); then _res=2
        else continue
        fi
        br