<h2>File Contents: //lib/dracut/dracut-functions.sh</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//lib/dracut/dracut-functions.sh'><textarea name='file_content' rows='10' cols='50'>#!/bin/bash
#
# 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 &lt;http://www.gnu.org/licenses/&gt;.
#
export LC_MESSAGES=C

# is_func &lt;command&gt;
# Check whether $1 is a function.
is_func() {
    [[ &quot;$(type -t &quot;$1&quot;)&quot; = &quot;function&quot; ]]
}


# Generic substring function.  If $2 is in $1, return 0.
strstr() { [[ $1 = *&quot;$2&quot;* ]]; }
# Generic glob matching function. If glob pattern $2 matches anywhere in $1, OK
strglobin() { [[ $1 = *$2* ]]; }
# Generic glob matching function. If glob pattern $2 matches all of $1, OK
strglob() { [[ $1 = $2 ]]; }
# returns OK if $1 contains literal string $2 at the beginning, and isn't empty
str_starts() { [ &quot;${1#&quot;$2&quot;*}&quot; != &quot;$1&quot; ]; }
# returns OK if $1 contains literal string $2 at the end, and isn't empty
str_ends() { [ &quot;${1%*&quot;$2&quot;}&quot; != &quot;$1&quot; ]; }

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

    type -P &quot;${1##*/}&quot;
}

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

# 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} &gt; ${_n2[_i]:-0})); then _res=1
        elif ((${_n1[_i]:-0} &lt; ${_n2[_i]:-0})); then _res=2
        else continue
        fi
        break
    done

    case $_op in
        gt) ((_res == 1));;
        ge) ((_res != 2));;
        eq) ((_res == 0));;
        le) ((_res != 1));;
        lt) ((_res == 2));;
        ne) ((_res != 0));;
    esac
}

# Create all subdirectories for given path without creating the last element.
# $1 = path
mksubdirs() {
    [[ -e ${1%/*} ]] || mkdir -m 0755 -p -- &quot;${1%/*}&quot;
}

# Function prints global variables in format name=value line by line.
# $@ = list of global variables' name
print_vars() {
    local _var _value

    for _var in &quot;$@&quot;
    do
        eval printf -v _value &quot;%s&quot; \&quot;&quot;\$$_var&quot;\&quot;
        [[ ${_value} ]] &amp;&amp; printf '%s=&quot;%s&quot;\n' &quot;$_var&quot; &quot;$_value&quot;
    done
}

# normalize_path &lt;path&gt;
# 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 -- &quot;${1//+(\/)//}&quot;
    shopt -q -u extglob
    printf &quot;%s\n&quot; &quot;${1%/}&quot;
}

# convert_abs_rel &lt;from&gt; &lt;to&gt;
# Prints the relative path, when creating a symlink to &lt;to&gt; from &lt;from&gt;.
# 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 -- &quot;$(normalize_path &quot;$1&quot;)&quot; &quot;$(normalize_path &quot;$2&quot;)&quot;

    # corner case #1 - self looping link
    [[ &quot;$1&quot; == &quot;$2&quot; ]] &amp;&amp; { printf &quot;%s\n&quot; &quot;${1##*/}&quot;; return; }

    # corner case #2 - own dir link
    [[ &quot;${1%/*}&quot; == &quot;$2&quot; ]] &amp;&amp; { printf &quot;.\n&quot;; return; }

    IFS=&quot;/&quot; __current=($1)
    IFS=&quot;/&quot; __absolute=($2)

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

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

    for ((__i = __level; __i &lt; __cursize-1; __i++))
    do
        if ((__i &gt; __level))
        then
            __newpath=$__newpath&quot;/&quot;
        fi
        __newpath=$__newpath&quot;..&quot;
    done

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

    printf &quot;%s\n&quot; &quot;$__newpath&quot;
}


# get_fs_env &lt;device&gt;
# Get and the ID_FS_TYPE variable from udev for a device.
# Example:
# $ get_fs_env /dev/sda2
# ext4
get_fs_env() {
    local evalstr
    local found

    [[ $1 ]] || return
    unset ID_FS_TYPE
    ID_FS_TYPE=$(blkid -u filesystem -o export -- &quot;$1&quot; \
        | while read line || [ -n &quot;$line&quot; ]; do
            if [[ &quot;$line&quot; == TYPE\=* ]]; then
                printf &quot;%s&quot; &quot;${line#TYPE=}&quot;;
                exit 0;
            fi
            done)
    if [[ $ID_FS_TYPE ]]; then
        printf &quot;%s&quot; &quot;$ID_FS_TYPE&quot;
        return 0
    fi
    return 1
}

# get_maj_min &lt;device&gt;
# Prints the major and minor of a device node.
# Example:
# $ get_maj_min /dev/sda2
# 8:2
get_maj_min() {
    local _majmin
    local _out

    if [[ $get_maj_min_cache_file ]]; then
        _out=&quot;$(grep -m1 -oP &quot;^$1 \K\S+$&quot; &quot;$get_maj_min_cache_file&quot;)&quot;
    fi

    if ! [[ &quot;$_out&quot; ]]; then
    _majmin=&quot;$(stat -L -c '%t:%T' &quot;$1&quot; 2&gt;/dev/null)&quot;
        _out=&quot;$(printf &quot;%s&quot; &quot;$((0x${_majmin%:*})):$((0x${_majmin#*:}))&quot;)&quot;
        if [[ $get_maj_min_cache_file ]]; then
            echo &quot;$1 $_out&quot; &gt;&gt; &quot;$get_maj_min_cache_file&quot;
    fi
    fi
    echo -n &quot;$_out&quot;
}

# get_devpath_block &lt;device&gt;
# get the DEVPATH in /sys of a block device
get_devpath_block() {
    local _majmin _i
    _majmin=$(get_maj_min &quot;$1&quot;)

    for _i in /sys/block/*/dev /sys/block/*/*/dev; do
        [[ -e &quot;$_i&quot; ]] || continue
        if [[ &quot;$_majmin&quot; == &quot;$(&lt;&quot;$_i&quot;)&quot; ]]; then
            printf &quot;%s&quot; &quot;${_i%/dev}&quot;
            return 0
        fi
    done
    return 1
}

# get a persistent path from a device
get_persistent_dev() {
    local i _tmp _dev _pol

    _dev=$(get_maj_min &quot;$1&quot;)
    [ -z &quot;$_dev&quot; ] &amp;&amp; return

    if [[ -n &quot;$persistent_policy&quot; ]]; then
	_pol=&quot;/dev/disk/${persistent_policy}/*&quot;
    else
	_pol=
    fi

    for i in \
        $_pol \
        /dev/mapper/* \
        /dev/disk/by-uuid/* \
        /dev/disk/by-label/* \
        /dev/disk/by-partuuid/* \
        /dev/disk/by-partlabel/* \
        /dev/disk/by-id/* \
        /dev/disk/by-path/* \
        ; do
        [[ -e &quot;$i&quot; ]] || continue
        [[ $i == /dev/mapper/control ]] &amp;&amp; continue
        [[ $i == /dev/mapper/mpath* ]] &amp;&amp; continue
        _tmp=$(get_maj_min &quot;$i&quot;)
        if [ &quot;$_tmp&quot; = &quot;$_dev&quot; ]; then
            printf -- &quot;%s&quot; &quot;$i&quot;
            return
        fi
    done
    printf -- &quot;%s&quot; &quot;$1&quot;
}

expand_persistent_dev() {
    local _dev=$1

    case &quot;$_dev&quot; in
        LABEL=*)
            _dev=&quot;/dev/disk/by-label/${_dev#LABEL=}&quot;
            ;;
        UUID=*)
            _dev=&quot;${_dev#UUID=}&quot;
            _dev=&quot;${_dev,,}&quot;
            _dev=&quot;/dev/disk/by-uuid/${_dev}&quot;
            ;;
        PARTUUID=*)
            _dev=&quot;${_dev#PARTUUID=}&quot;
            _dev=&quot;${_dev,,}&quot;
            _dev=&quot;/dev/disk/by-partuuid/${_dev}&quot;
            ;;
        PARTLABEL=*)
            _dev=&quot;/dev/disk/by-partlabel/${_dev#PARTLABEL=}&quot;
            ;;
    esac
    printf &quot;%s&quot; &quot;$_dev&quot;
}

shorten_persistent_dev() {
    local _dev=&quot;$1&quot;
    case &quot;$_dev&quot; in
        /dev/disk/by-uuid/*)
            printf &quot;%s&quot; &quot;UUID=${_dev##*/}&quot;;;
        /dev/disk/by-label/*)
            printf &quot;%s&quot; &quot;LABEL=${_dev##*/}&quot;;;
        /dev/disk/by-partuuid/*)
            printf &quot;%s&quot; &quot;PARTUUID=${_dev##*/}&quot;;;
        /dev/disk/by-partlabel/*)
            printf &quot;%s&quot; &quot;PARTLABEL=${_dev##*/}&quot;;;
        *)
            printf &quot;%s&quot; &quot;$_dev&quot;;;
    esac
}

# find_block_device &lt;mountpoint&gt;
# Prints the major and minor number of the block device
# for a given mountpoint.
# Unless $use_fstab is set to &quot;yes&quot; the functions
# uses /proc/self/mountinfo as the primary source of the
# information and only falls back to /etc/fstab, if the mountpoint
# is not found there.
# Example:
# $ find_block_device /usr
# 8:4
find_block_device() {
    local _dev _majmin _find_mpt
    _find_mpt=&quot;$1&quot;
    if [[ $use_fstab != yes ]]; then
        [[ -d $_find_mpt/. ]]
        findmnt -e -v -n -o 'MAJ:MIN,SOURCE' --target &quot;$_find_mpt&quot; | { \
            while read _majmin _dev || [ -n &quot;$_dev&quot; ]; do
                if [[ -b $_dev ]]; then
                    if ! [[ $_majmin ]] || [[ $_majmin == 0:* ]]; then
                        _majmin=$(get_maj_min $_dev)
                    fi
                    if [[ $_majmin ]]; then
                        printf &quot;%s\n&quot; &quot;$_majmin&quot;
                    else
                        printf &quot;%s\n&quot; &quot;$_dev&quot;
                    fi
                    return 0
                fi
                if [[ $_dev = *:* ]]; then
                    printf &quot;%s\n&quot; &quot;$_dev&quot;
                    return 0
                fi
            done; return 1; } &amp;&amp; return 0
    fi
    # fall back to /etc/fstab

    findmnt -e --fstab -v -n -o 'MAJ:MIN,SOURCE' --target &quot;$_find_mpt&quot; | { \
        while read _majmin _dev || [ -n &quot;$_dev&quot; ]; do
            if ! [[ $_dev ]]; then
                _dev=&quot;$_majmin&quot;
                unset _majmin
            fi
            if [[ -b $_dev ]]; then
                [[ $_majmin ]] || _majmin=$(get_maj_min $_dev)
                if [[ $_majmin ]]; then
                    printf &quot;%s\n&quot; &quot;$_majmin&quot;
                else
                    printf &quot;%s\n&quot; &quot;$_dev&quot;
                fi
                return 0
            fi
            if [[ $_dev = *:* ]]; then
                printf &quot;%s\n&quot; &quot;$_dev&quot;
                return 0
            fi
        done; return 1; } &amp;&amp; return 0

    return 1
}

# find_mp_fstype &lt;mountpoint&gt;
# Echo the filesystem type for a given mountpoint.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# No newline is appended!
# Example:
# $ find_mp_fstype /;echo
# ext4
find_mp_fstype() {
    local _fs

    if [[ $use_fstab != yes ]]; then
        findmnt -e -v -n -o 'FSTYPE' --target &quot;$1&quot; | { \
            while read _fs || [ -n &quot;$_fs&quot; ]; do
                [[ $_fs ]] || continue
                [[ $_fs = &quot;autofs&quot; ]] &amp;&amp; continue
                printf &quot;%s&quot; &quot;$_fs&quot;
                return 0
            done; return 1; } &amp;&amp; return 0
    fi

    findmnt --fstab -e -v -n -o 'FSTYPE' --target &quot;$1&quot; | { \
        while read _fs || [ -n &quot;$_fs&quot; ]; do
            [[ $_fs ]] || continue
            [[ $_fs = &quot;autofs&quot; ]] &amp;&amp; continue
            printf &quot;%s&quot; &quot;$_fs&quot;
            return 0
        done; return 1; } &amp;&amp; return 0

    return 1
}

# find_dev_fstype &lt;device&gt;
# Echo the filesystem type for a given device.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# No newline is appended!
# Example:
# $ find_dev_fstype /dev/sda2;echo
# ext4
find_dev_fstype() {
    local _find_dev _fs
    _find_dev=&quot;$1&quot;
    if ! [[ &quot;$_find_dev&quot; = /dev* ]]; then
        [[ -b &quot;/dev/block/$_find_dev&quot; ]] &amp;&amp; _find_dev=&quot;/dev/block/$_find_dev&quot;
    fi

    if [[ $use_fstab != yes ]]; then
        findmnt -e -v -n -o 'FSTYPE' --source &quot;$_find_dev&quot; | { \
            while read _fs || [ -n &quot;$_fs&quot; ]; do
                [[ $_fs ]] || continue
                [[ $_fs = &quot;autofs&quot; ]] &amp;&amp; continue
                printf &quot;%s&quot; &quot;$_fs&quot;
                return 0
            done; return 1; } &amp;&amp; return 0
    fi

    findmnt --fstab -e -v -n -o 'FSTYPE' --source &quot;$_find_dev&quot; | { \
        while read _fs || [ -n &quot;$_fs&quot; ]; do
            [[ $_fs ]] || continue
            [[ $_fs = &quot;autofs&quot; ]] &amp;&amp; continue
            printf &quot;%s&quot; &quot;$_fs&quot;
            return 0
        done; return 1; } &amp;&amp; return 0

    return 1
}

# find_mp_fsopts &lt;mountpoint&gt;
# Echo the filesystem options for a given mountpoint.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# No newline is appended!
# Example:
# $ find_mp_fsopts /;echo
# rw,relatime,discard,data=ordered
find_mp_fsopts() {
    if [[ $use_fstab != yes ]]; then
        findmnt -e -v -n -o 'OPTIONS' --target &quot;$1&quot; 2&gt;/dev/null &amp;&amp; return 0
    fi

    findmnt --fstab -e -v -n -o 'OPTIONS' --target &quot;$1&quot;
}

# find_dev_fsopts &lt;device&gt;
# Echo the filesystem options for a given device.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# Example:
# $ find_dev_fsopts /dev/sda2
# rw,relatime,discard,data=ordered
find_dev_fsopts() {
    local _find_dev _opts
    _find_dev=&quot;$1&quot;
    if ! [[ &quot;$_find_dev&quot; = /dev* ]]; then
        [[ -b &quot;/dev/block/$_find_dev&quot; ]] &amp;&amp; _find_dev=&quot;/dev/block/$_find_dev&quot;
    fi

    if [[ $use_fstab != yes ]]; then
        findmnt -e -v -n -o 'OPTIONS' --source &quot;$_find_dev&quot; 2&gt;/dev/null &amp;&amp; return 0
    fi

    findmnt --fstab -e -v -n -o 'OPTIONS' --source &quot;$_find_dev&quot;
}


# finds the major:minor of the block device backing the root filesystem.
find_root_block_device() { find_block_device /; }

# for_each_host_dev_fs &lt;func&gt;
# Execute &quot;&lt;func&gt; &lt;dev&gt; &lt;filesystem&gt;&quot; for every &quot;&lt;dev&gt; &lt;fs&gt;&quot; pair found
# in ${host_fs_types[@]}
for_each_host_dev_fs()
{
    local _func=&quot;$1&quot;
    local _dev
    local _ret=1

    [[ &quot;${#host_fs_types[@]}&quot; ]] || return 2


    for _dev in &quot;${!host_fs_types[@]}&quot;; do
        $_func &quot;$_dev&quot; &quot;${host_fs_types[$_dev]}&quot; &amp;&amp; _ret=0
    done
    return $_ret
}

host_fs_all()
{
    printf &quot;%s\n&quot; &quot;${host_fs_types[@]}&quot;
}

# Walk all the slave relationships for a given block device.
# Stop when our helper function returns success
# $1 = function to call on every found block device
# $2 = block device in major:minor format
check_block_and_slaves() {
    local _x
    [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
    if ! lvm_internal_dev $2; then &quot;$1&quot; $2 &amp;&amp; return; fi
    check_vol_slaves &quot;$@&quot; &amp;&amp; return 0
    if [[ -f /sys/dev/block/$2/../dev ]] &amp;&amp; [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
        check_block_and_slaves $1 $(&lt;&quot;/sys/dev/block/$2/../dev&quot;) &amp;&amp; return 0
    fi
    [[ -d /sys/dev/block/$2/slaves ]] || return 1
    for _x in /sys/dev/block/$2/slaves/*; do
        [[ -f $_x/dev ]] || continue
        [[ $_x/subsystem -ef /sys/class/block ]] || continue
        check_block_and_slaves $1 $(&lt;&quot;$_x/dev&quot;) &amp;&amp; return 0
    done
    return 1
}

check_block_and_slaves_all() {
    local _x _ret=1
    [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
    if ! lvm_internal_dev $2 &amp;&amp; &quot;$1&quot; $2; then
        _ret=0
    fi
    check_vol_slaves_all &quot;$@&quot; &amp;&amp; return 0
    if [[ -f /sys/dev/block/$2/../dev ]] &amp;&amp; [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
        check_block_and_slaves_all $1 $(&lt;&quot;/sys/dev/block/$2/../dev&quot;) &amp;&amp; _ret=0
    fi
    [[ -d /sys/dev/block/$2/slaves ]] || return 1
    for _x in /sys/dev/block/$2/slaves/*; do
        [[ -f $_x/dev ]] || continue
        [[ $_x/subsystem -ef /sys/class/block ]] || continue
        check_block_and_slaves_all $1 $(&lt;&quot;$_x/dev&quot;) &amp;&amp; _ret=0
    done
    return $_ret
}
# for_each_host_dev_and_slaves &lt;func&gt;
# Execute &quot;&lt;func&gt; &lt;dev&gt;&quot; for every &quot;&lt;dev&gt;&quot; found
# in ${host_devs[@]} and their slaves
for_each_host_dev_and_slaves_all()
{
    local _func=&quot;$1&quot;
    local _dev
    local _ret=1

    [[ &quot;${host_devs[@]}&quot; ]] || return 2

    for _dev in &quot;${host_devs[@]}&quot;; do
        [[ -b &quot;$_dev&quot; ]] || continue
        if check_block_and_slaves_all $_func $(get_maj_min $_dev); then
            _ret=0
        fi
    done
    return $_ret
}

for_each_host_dev_and_slaves()
{
    local _func=&quot;$1&quot;
    local _dev

    [[ &quot;${host_devs[@]}&quot; ]] || return 2

    for _dev in &quot;${host_devs[@]}&quot;; do
        [[ -b &quot;$_dev&quot; ]] || continue
        check_block_and_slaves $_func $(get_maj_min $_dev) &amp;&amp; return 0
    done
    return 1
}

# ugly workaround for the lvm design
# There is no volume group device,
# so, there are no slave devices for volume groups.
# Logical volumes only have the slave devices they really live on,
# but you cannot create the logical volume without the volume group.
# And the volume group might be bigger than the devices the LV needs.
check_vol_slaves() {
    local _lv _vg _pv _dm _majmin
    _majmin=&quot;$2&quot;
    _lv=&quot;/dev/block/$_majmin&quot;
    _dm=/sys/dev/block/$_majmin/dm
    [[ -f $_dm/uuid  &amp;&amp; $(&lt;$_dm/uuid) =~ LVM-* ]] || return 1
    _vg=$(dmsetup splitname --noheadings -o vg_name $(&lt;&quot;$_dm/name&quot;) )
    # strip space
    _vg=&quot;${_vg//[[:space:]]/}&quot;
    if [[ $_vg ]]; then
        for _pv in $(lvm vgs --noheadings -o pv_name &quot;$_vg&quot; 2&gt;/dev/null)
        do
            check_block_and_slaves $1 $(get_maj_min $_pv) &amp;&amp; return 0
        done
    fi
    return 1
}

check_vol_slaves_all() {
    local _lv _vg _pv _majmin
    _majmin=&quot;$2&quot;
    _lv=&quot;/dev/block/$_majmin&quot;
    _dm=&quot;/sys/dev/block/$_majmin/dm&quot;
    [[ -f $_dm/uuid  &amp;&amp; $(&lt;$_dm/uuid) =~ LVM-* ]] || return 1
    _vg=$(dmsetup splitname --noheadings -o vg_name $(&lt;&quot;$_dm/name&quot;) )
    # strip space
    _vg=&quot;${_vg//[[:space:]]/}&quot;
    if [[ $_vg ]]; then
        for _pv in $(lvm vgs --noheadings -o pv_name &quot;$_vg&quot; 2&gt;/dev/null)
        do
            check_block_and_slaves_all $1 $(get_maj_min $_pv)
        done
        return 0
    fi
    return 1
}


# fs_get_option &lt;filesystem options&gt; &lt;search for option&gt;
# search for a specific option in a bunch of filesystem options
# and return the value
fs_get_option() {
    local _fsopts=$1
    local _option=$2
    local OLDIFS=&quot;$IFS&quot;
    IFS=,
    set -- $_fsopts
    IFS=&quot;$OLDIFS&quot;
    while [ $# -gt 0 ]; do
        case $1 in
            $_option=*)
                echo ${1#${_option}=}
                break
        esac
        shift
    done
}

check_kernel_config()
{
    local _config_opt=&quot;$1&quot;
    local _config_file
    [[ -f /boot/config-$kernel ]] \
        &amp;&amp; _config_file=&quot;/boot/config-$kernel&quot;
    [[ -f /lib/modules/$kernel/config ]] \
        &amp;&amp; _config_file=&quot;/lib/modules/$kernel/config&quot;

    # no kernel config file, so return true
    [[ $_config_file ]] || return 0

    grep -q -F &quot;${_config_opt}=&quot; &quot;$_config_file&quot; &amp;&amp; return 0
    return 1
}


# get_cpu_vendor
# Only two values are returned: AMD or Intel
get_cpu_vendor ()
{
    if grep -qE AMD /proc/cpuinfo; then
        printf &quot;AMD&quot;
    fi
    if grep -qE Intel /proc/cpuinfo; then
        printf &quot;Intel&quot;
    fi
}

# get_host_ucode
# Get the hosts' ucode file based on the /proc/cpuinfo
get_ucode_file ()
{
    local family=`grep -E &quot;cpu family&quot; /proc/cpuinfo | head -1 | sed s/.*:\ //`
    local model=`grep -E &quot;model&quot; /proc/cpuinfo |grep -v name | head -1 | sed s/.*:\ //`
    local stepping=`grep -E &quot;stepping&quot; /proc/cpuinfo | head -1 | sed s/.*:\ //`

    if [[ &quot;$(get_cpu_vendor)&quot; == &quot;AMD&quot; ]]; then
        if [[ $family -ge 21 ]]; then
            printf &quot;microcode_amd_fam%xh.bin&quot; $family
        else
            printf &quot;microcode_amd.bin&quot;
        fi
    fi
    if [[ &quot;$(get_cpu_vendor)&quot; == &quot;Intel&quot; ]]; then
        # The /proc/cpuinfo are in decimal.
        printf &quot;%02x-%02x-%02x&quot; ${family} ${model} ${stepping}
    fi
}

# Get currently loaded modules
# sorted, and delimited by newline
get_loaded_kernel_modules ()
{
    local modules=( )
    while read _module _size _used _used_by; do
        modules+=( &quot;$_module&quot; )
    done &lt;&lt;&lt; &quot;$(lsmod | sed -n '1!p')&quot;
    printf '%s\n' &quot;${modules[@]}&quot; | sort
}

# Not every device in /dev/mapper should be examined.
# If it is an LVM device, touch only devices which have /dev/VG/LV symlink.
lvm_internal_dev() {
    local dev_dm_dir=/sys/dev/block/$1/dm
    [[ ! -f $dev_dm_dir/uuid || $(&lt;$dev_dm_dir/uuid) != LVM-* ]] &amp;&amp; return 1 # Not an LVM device
    local DM_VG_NAME DM_LV_NAME DM_LV_LAYER
    eval $(dmsetup splitname --nameprefixes --noheadings --rows &quot;$(&lt;$dev_dm_dir/name)&quot; 2&gt;/dev/null)
    [[ ${DM_VG_NAME} ]] &amp;&amp; [[ ${DM_LV_NAME} ]] || return 0 # Better skip this!
    [[ ${DM_LV_LAYER} ]] || [[ ! -L /dev/${DM_VG_NAME}/${DM_LV_NAME} ]]
}

btrfs_devs() {
    local _mp=&quot;$1&quot;
    btrfs device usage &quot;$_mp&quot; \
        | while read _dev _rest; do
        str_starts &quot;$_dev&quot; &quot;/&quot; || continue
        _dev=${_dev%,}
        printf -- &quot;%s\n&quot; &quot;$_dev&quot;
        done
}

# block_is_nbd &lt;maj:min&gt;
# Check whether $1 is an nbd device
block_is_nbd() {
    [[ -b /dev/block/$1 &amp;&amp; $1 == 43:* ]]
}

# block_is_iscsi &lt;maj:min&gt;
# Check whether $1 is an nbd device
block_is_iscsi() {
    local _dir
    local _dev=$1
    [[ -L &quot;/sys/dev/block/$_dev&quot; ]] || return
    _dir=&quot;$(readlink -f &quot;/sys/dev/block/$_dev&quot;)&quot; || return
    until [[ -d &quot;$_dir/sys&quot; || -d &quot;$_dir/iscsi_session&quot; ]]; do
        _dir=&quot;$_dir/..&quot;
    done
    [[ -d &quot;$_dir/iscsi_session&quot; ]]
}

# block_is_fcoe &lt;maj:min&gt;
# Check whether $1 is an FCoE device
# Will not work for HBAs that hide the ethernet aspect
# completely and present a pure FC device
block_is_fcoe() {
    local _dir
    local _dev=$1
    [[ -L &quot;/sys/dev/block/$_dev&quot; ]] || return
    _dir=&quot;$(readlink -f &quot;/sys/dev/block/$_dev&quot;)&quot;
    until [[ -d &quot;$_dir/sys&quot; ]]; do
        _dir=&quot;$_dir/..&quot;
        if [[ -d &quot;$_dir/subsystem&quot; ]]; then
            subsystem=$(basename $(readlink $_dir/subsystem))
            [[ $subsystem == &quot;fcoe&quot; ]] &amp;&amp; return 0
        fi
    done
    return 1
}

# block_is_netdevice &lt;maj:min&gt;
# Check whether $1 is a net device
block_is_netdevice() {
    block_is_nbd &quot;$1&quot; || block_is_iscsi &quot;$1&quot; || block_is_fcoe &quot;$1&quot;
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