dracut-functions.sh

   1 #!/bin/bash
   2 #
   3 # functions used by dracut and other tools.
   4 #
   5 # Copyright 2005-2009 Red Hat, Inc.  All rights reserved.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20 export LC_MESSAGES=C
  21
  22 # is_func <command>
  23 # Check whether $1 is a function.
  24 is_func() {
  25     [[ "$(type -t "$1")" == "function" ]]
  26 }
  27
  28 # Generic substring function.  If $2 is in $1, return 0.
  29 strstr() { [[ $1 == *"$2"* ]]; }
  30 # Generic glob matching function. If glob pattern $2 matches anywhere in $1, OK
  31 strglobin() { [[ $1 == *$2* ]]; }
  32 # Generic glob matching function. If glob pattern $2 matches all of $1, OK
  33 # shellcheck disable=SC2053
  34 strglob() { [[ $1 == $2 ]]; }
  35 # returns OK if $1 contains literal string $2 at the beginning, and isn't empty
  36 str_starts() { [ "${1#"$2"*}" != "$1" ]; }
  37 # returns OK if $1 contains literal string $2 at the end, and isn't empty
  38 str_ends() { [ "${1%*"$2"}" != "$1" ]; }
  39
  40 # find a binary.  If we were not passed the full path directly,
  41 # search in the usual places to find the binary.
  42 find_binary() {
  43     local _delim
  44     local _path
  45     local l
  46     local p
  47     [[ -z ${1##/*} ]] || _delim="/"
  48
  49     if [[ $1 == *.so* ]]; then
  50         # shellcheck disable=SC2154
  51         for l in $libdirs; do
  52             _path="${l}${_delim}${1}"
  53             if { $DRACUT_LDD "${dracutsysrootdir}${_path}" &> /dev/null; }; then
  54                 printf "%s\n" "${_path}"
  55                 return 0
  56             fi
  57         done
  58         _path="${_delim}${1}"
  59         if { $DRACUT_LDD "${dracutsysrootdir}${_path}" &> /dev/null; }; then
  60             printf "%s\n" "${_path}"
  61             return 0
  62         fi
  63     fi
  64     if [[ $1 == */* ]]; then
  65         _path="${_delim}${1}"
  66         if [[ -L ${dracutsysrootdir}${_path} ]] || [[ -x ${dracutsysrootdir}${_path} ]]; then
  67             printf "%s\n" "${_path}"
  68             return 0
  69         fi
  70     fi
  71     for p in $DRACUT_PATH; do
  72         _path="${p}${_delim}${1}"
  73         if [[ -L ${dracutsysrootdir}${_path} ]] || [[ -x ${dracutsysrootdir}${_path} ]]; then
  74             printf "%s\n" "${_path}"
  75             return 0
  76         fi
  77     done
  78
  79     [[ -n $dracutsysrootdir ]] && return 1
  80     type -P "${1##*/}"
  81 }
  82
  83 ldconfig_paths() {
  84     $DRACUT_LDCONFIG ${dracutsysrootdir:+-r ${dracutsysrootdir} -f /etc/ld.so.conf} -pN 2> /dev/null | grep -E -v '/(lib|lib64|usr/lib|usr/lib64)/[^/]*$' | sed -n 's,.* => \(.*\)/.*,\1,p' | sort | uniq
  85 }
  86
  87 # Version comparision function.  Assumes Linux style version scheme.
  88 # $1 = version a
  89 # $2 = comparision op (gt, ge, eq, le, lt, ne)
  90 # $3 = version b
  91 vercmp() {
  92     local _n1
  93     read -r -a _n1 <<< "${1//./ }"
  94     local _op=$2
  95     local _n2
  96     read -r -a _n2 <<< "${3//./ }"
  97     local _i _res
  98
  99     for ((_i = 0; ; _i++)); do
 100         if [[ ! ${_n1[_i]}${_n2[_i]} ]]; then
 101             _res=0
 102         elif ((${_n1[_i]:-0} > ${_n2[_i]:-0})); then
 103             _res=1
 104         elif ((${_n1[_i]:-0} < ${_n2[_i]:-0})); then
 105             _res=2
 106         else
 107             continue
 108         fi
 109         break
 110     done
 111
 112     case $_op in
 113         gt) ((_res == 1)) ;;
 114         ge) ((_res != 2)) ;;
 115         eq) ((_res == 0)) ;;
 116         le) ((_res != 1)) ;;
 117         lt) ((_res == 2)) ;;
 118         ne) ((_res != 0)) ;;
 119     esac
 120 }
 121
 122 # Create all subdirectories for given path without creating the last element.
 123 # $1 = path
 124 mksubdirs() {
 125     # shellcheck disable=SC2174
 126     [[ -e ${1%/*} ]] || mkdir -m 0755 -p -- "${1%/*}"
 127 }
 128
 129 # Function prints global variables in format name=value line by line.
 130 # $@ = list of global variables' name
 131 print_vars() {
 132     local _var _value
 133
 134     for _var in "$@"; do
 135         eval printf -v _value "%s" \""\$$_var"\"
 136         [[ ${_value} ]] && printf '%s="%s"\n' "$_var" "$_value"
 137     done
 138 }
 139
 140 # normalize_path <path>
 141 # Prints the normalized path, where it removes any duplicated
 142 # and trailing slashes.
 143 # Example:
 144 # $ normalize_path ///test/test//
 145 # /test/test
 146 normalize_path() {
 147     # shellcheck disable=SC2064
 148     trap "$(shopt -p extglob)" RETURN
 149     shopt -q -s extglob
 150     local p=${1//+(\/)//}
 151     printf "%s\n" "${p%/}"
 152 }
 153
 154 # convert_abs_rel <from> <to>
 155 # Prints the relative path, when creating a symlink to <to> from <from>.
 156 # Example:
 157 # $ convert_abs_rel /usr/bin/test /bin/test-2
 158 # ../../bin/test-2
 159 # $ ln -s $(convert_abs_rel /usr/bin/test /bin/test-2) /usr/bin/test
 160 convert_abs_rel() {
 161     local __current __absolute __abssize __cursize __newpath
 162     local -i __i __level
 163
 164     set -- "$(normalize_path "$1")" "$(normalize_path "$2")"
 165
 166     # corner case #1 - self looping link
 167     [[ $1 == "$2" ]] && {
 168         printf "%s\n" "${1##*/}"
 169         return
 170     }
 171
 172     # corner case #2 - own dir link
 173     [[ ${1%/*} == "$2" ]] && {
 174         printf ".\n"
 175         return
 176     }
 177
 178     IFS=/ read -r -a __current <<< "$1"
 179     IFS=/ read -r -a __absolute <<< "$2"
 180
 181     __abssize=${#__absolute[@]}
 182     __cursize=${#__current[@]}
 183
 184     while [[ ${__absolute[__level]} == "${__current[__level]}" ]]; do
 185         ((__level++))
 186         if ((__level > __abssize || __level > __cursize)); then
 187             break
 188         fi
 189     done
 190
 191     for ((__i = __level; __i < __cursize - 1; __i++)); do
 192         if ((__i > __level)); then
 193             __newpath=$__newpath"/"
 194         fi
 195         __newpath=$__newpath".."
 196     done
 197
 198     for ((__i = __level; __i < __abssize; __i++)); do
 199         if [[ -n $__newpath ]]; then
 200             __newpath=$__newpath"/"
 201         fi
 202         __newpath=$__newpath${__absolute[__i]}
 203     done
 204
 205     printf -- "%s\n" "$__newpath"
 206 }
 207
 208 # get_fs_env <device>
 209 # Get and the ID_FS_TYPE variable from udev for a device.
 210 # Example:
 211 # $ get_fs_env /dev/sda2
 212 # ext4
 213 get_fs_env() {
 214     [[ $1 ]] || return
 215     unset ID_FS_TYPE
 216     ID_FS_TYPE=$(blkid -u filesystem -o export -- "$1" \
 217         | while read -r line || [ -n "$line" ]; do
 218             if [[ $line == "TYPE="* ]]; then
 219                 printf "%s" "${line#TYPE=}"
 220                 exit 0
 221             fi
 222         done)
 223     if [[ $ID_FS_TYPE ]]; then
 224         printf "%s" "$ID_FS_TYPE"
 225         return 0
 226     fi
 227     return 1
 228 }
 229
 230 # get_maj_min <device>
 231 # Prints the major and minor of a device node.
 232 # Example:
 233 # $ get_maj_min /dev/sda2
 234 # 8:2
 235 get_maj_min() {
 236     local _majmin
 237     out="$(grep -m1 -oP "^$1 \K\S+$" "${get_maj_min_cache_file:?}")"
 238     if [ -z "$out" ]; then
 239         _majmin="$(stat -L -c '%t:%T' "$1" 2> /dev/null)"
 240         out="$(printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))")"
 241         echo "$1 $out" >> "${get_maj_min_cache_file:?}"
 242     fi
 243     echo -n "$out"
 244 }
 245
 246 # get_devpath_block <device>
 247 # get the DEVPATH in /sys of a block device
 248 get_devpath_block() {
 249     local _majmin _i
 250     _majmin=$(get_maj_min "$1")
 251
 252     for _i in /sys/block/*/dev /sys/block/*/*/dev; do
 253         [[ -e $_i ]] || continue
 254         if [[ $_majmin == "$(< "$_i")" ]]; then
 255             printf "%s" "${_i%/dev}"
 256             return 0
 257         fi
 258     done
 259     return 1
 260 }
 261
 262 # get a persistent path from a device
 263 get_persistent_dev() {
 264     local i _tmp _dev _pol
 265
 266     _dev=$(get_maj_min "$1")
 267     [ -z "$_dev" ] && return
 268
 269     if [[ -n $persistent_policy ]]; then
 270         _pol="/dev/disk/${persistent_policy}/*"
 271     else
 272         _pol=
 273     fi
 274
 275     for i in \
 276         $_pol \
 277         /dev/mapper/* \
 278         /dev/disk/by-uuid/* \
 279         /dev/disk/by-label/* \
 280         /dev/disk/by-partuuid/* \
 281         /dev/disk/by-partlabel/* \
 282         /dev/disk/by-id/* \
 283         /dev/disk/by-path/*; do
 284         [[ -e $i ]] || continue
 285         [[ $i == /dev/mapper/control ]] && continue
 286         [[ $i == /dev/mapper/mpath* ]] && continue
 287         _tmp=$(get_maj_min "$i")
 288         if [ "$_tmp" = "$_dev" ]; then
 289             printf -- "%s" "$i"
 290             return
 291         fi
 292     done
 293     printf -- "%s" "$1"
 294 }
 295
 296 expand_persistent_dev() {
 297     local _dev=$1
 298
 299     case "$_dev" in
 300         LABEL=*)
 301             _dev="/dev/disk/by-label/${_dev#LABEL=}"
 302             ;;
 303         UUID=*)
 304             _dev="${_dev#UUID=}"
 305             _dev="${_dev,,}"
 306             _dev="/dev/disk/by-uuid/${_dev}"
 307             ;;
 308         PARTUUID=*)
 309             _dev="${_dev#PARTUUID=}"
 310             _dev="${_dev,,}"
 311             _dev="/dev/disk/by-partuuid/${_dev}"
 312             ;;
 313         PARTLABEL=*)
 314             _dev="/dev/disk/by-partlabel/${_dev#PARTLABEL=}"
 315             ;;
 316     esac
 317     printf "%s" "$_dev"
 318 }
 319
 320 shorten_persistent_dev() {
 321     local _dev="$1"
 322     case "$_dev" in
 323         /dev/disk/by-uuid/*)
 324             printf "%s" "UUID=${_dev##*/}"
 325             ;;
 326         /dev/disk/by-label/*)
 327             printf "%s" "LABEL=${_dev##*/}"
 328             ;;
 329         /dev/disk/by-partuuid/*)
 330             printf "%s" "PARTUUID=${_dev##*/}"
 331             ;;
 332         /dev/disk/by-partlabel/*)
 333             printf "%s" "PARTLABEL=${_dev##*/}"
 334             ;;
 335         *)
 336             printf "%s" "$_dev"
 337             ;;
 338     esac
 339 }
 340
 341 # find_block_device <mountpoint>
 342 # Prints the major and minor number of the block device
 343 # for a given mountpoint.
 344 # Unless $use_fstab is set to "yes" the functions
 345 # uses /proc/self/mountinfo as the primary source of the
 346 # information and only falls back to /etc/fstab, if the mountpoint
 347 # is not found there.
 348 # Example:
 349 # $ find_block_device /usr
 350 # 8:4
 351 find_block_device() {
 352     local _dev _majmin _find_mpt
 353     _find_mpt="$1"
 354
 355     if [[ $use_fstab != yes ]]; then
 356         [[ -d $_find_mpt/. ]]
 357         findmnt -e -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | {
 358             while read -r _majmin _dev || [ -n "$_dev" ]; do
 359                 if [[ -b $_dev ]]; then
 360                     if ! [[ $_majmin ]] || [[ $_majmin == 0:* ]]; then
 361                         _majmin=$(get_maj_min "$_dev")
 362                     fi
 363                     if [[ $_majmin ]]; then
 364                         printf "%s\n" "$_majmin"
 365                     else
 366                         printf "%s\n" "$_dev"
 367                     fi
 368                     return 0
 369                 fi
 370                 if [[ $_dev == *:* ]]; then
 371                     printf "%s\n" "$_dev"
 372                     return 0
 373                 fi
 374             done
 375             return 1
 376         } && return 0
 377     fi
 378     # fall back to /etc/fstab
 379
 380     findmnt -e --fstab -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | {
 381         while read -r _majmin _dev || [ -n "$_dev" ]; do
 382             if ! [[ $_dev ]]; then
 383                 _dev="$_majmin"
 384                 unset _majmin
 385             fi
 386             if [[ -b $_dev ]]; then
 387                 [[ $_majmin ]] || _majmin=$(get_maj_min "$_dev")
 388                 if [[ $_majmin ]]; then
 389                     printf "%s\n" "$_majmin"
 390                 else
 391                     printf "%s\n" "$_dev"
 392                 fi
 393                 return 0
 394             fi
 395             if [[ $_dev == *:* ]]; then
 396                 printf "%s\n" "$_dev"
 397                 return 0
 398             fi
 399         done
 400         return 1
 401     } && return 0
 402
 403     return 1
 404 }
 405
 406 # find_mp_fstype <mountpoint>
 407 # Echo the filesystem type for a given mountpoint.
 408 # /proc/self/mountinfo is taken as the primary source of information
 409 # and /etc/fstab is used as a fallback.
 410 # No newline is appended!
 411 # Example:
 412 # $ find_mp_fstype /;echo
 413 # ext4
 414 find_mp_fstype() {
 415     local _fs
 416
 417     if [[ $use_fstab != yes ]]; then
 418         findmnt -e -v -n -o 'FSTYPE' --target "$1" | {
 419             while read -r _fs || [ -n "$_fs" ]; do
 420                 [[ $_fs ]] || continue
 421                 [[ $_fs == "autofs" ]] && continue
 422                 printf "%s" "$_fs"
 423                 return 0
 424             done
 425             return 1
 426         } && return 0
 427     fi
 428
 429     findmnt --fstab -e -v -n -o 'FSTYPE' --target "$1" | {
 430         while read -r _fs || [ -n "$_fs" ]; do
 431             [[ $_fs ]] || continue
 432             [[ $_fs == "autofs" ]] && continue
 433             printf "%s" "$_fs"
 434             return 0
 435         done
 436         return 1
 437     } && return 0
 438
 439     return 1
 440 }
 441
 442 # find_dev_fstype <device>
 443 # Echo the filesystem type for a given device.
 444 # /proc/self/mountinfo is taken as the primary source of information
 445 # and /etc/fstab is used as a fallback.
 446 # No newline is appended!
 447 # Example:
 448 # $ find_dev_fstype /dev/sda2;echo
 449 # ext4
 450 find_dev_fstype() {
 451     local _find_dev _fs
 452     _find_dev="$1"
 453     if ! [[ $_find_dev == /dev* ]]; then
 454         [[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
 455     fi
 456
 457     if [[ $use_fstab != yes ]]; then
 458         findmnt -e -v -n -o 'FSTYPE' --source "$_find_dev" | {
 459             while read -r _fs || [ -n "$_fs" ]; do
 460                 [[ $_fs ]] || continue
 461                 [[ $_fs == "autofs" ]] && continue
 462                 printf "%s" "$_fs"
 463                 return 0
 464             done
 465             return 1
 466         } && return 0
 467     fi
 468
 469     findmnt --fstab -e -v -n -o 'FSTYPE' --source "$_find_dev" | {
 470         while read -r _fs || [ -n "$_fs" ]; do
 471             [[ $_fs ]] || continue
 472             [[ $_fs == "autofs" ]] && continue
 473             printf "%s" "$_fs"
 474             return 0
 475         done
 476         return 1
 477     } && return 0
 478
 479     return 1
 480 }
 481
 482 # find_mp_fsopts <mountpoint>
 483 # Echo the filesystem options for a given mountpoint.
 484 # /proc/self/mountinfo is taken as the primary source of information
 485 # and /etc/fstab is used as a fallback.
 486 # No newline is appended!
 487 # Example:
 488 # $ find_mp_fsopts /;echo
 489 # rw,relatime,discard,data=ordered
 490 find_mp_fsopts() {
 491     if [[ $use_fstab != yes ]]; then
 492         findmnt -e -v -n -o 'OPTIONS' --target "$1" 2> /dev/null && return 0
 493     fi
 494
 495     findmnt --fstab -e -v -n -o 'OPTIONS' --target "$1"
 496 }
 497
 498 # find_dev_fsopts <device>
 499 # Echo the filesystem options for a given device.
 500 # /proc/self/mountinfo is taken as the primary source of information
 501 # and /etc/fstab is used as a fallback.
 502 # if `use_fstab == yes`, then only `/etc/fstab` is used.
 503 #
 504 # Example:
 505 # $ find_dev_fsopts /dev/sda2
 506 # rw,relatime,discard,data=ordered
 507 find_dev_fsopts() {
 508     local _find_dev
 509     _find_dev="$1"
 510     if ! [[ $_find_dev == /dev* ]]; then
 511         [[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
 512     fi
 513
 514     if [[ $use_fstab != yes ]]; then
 515         findmnt -e -v -n -o 'OPTIONS' --source "$_find_dev" 2> /dev/null && return 0
 516     fi
 517
 518     findmnt --fstab -e -v -n -o 'OPTIONS' --source "$_find_dev"
 519 }
 520
 521 # finds the major:minor of the block device backing the root filesystem.
 522 find_root_block_device() { find_block_device /; }
 523
 524 # for_each_host_dev_fs <func>
 525 # Execute "<func> <dev> <filesystem>" for every "<dev> <fs>" pair found
 526 # in ${host_fs_types[@]}
 527 for_each_host_dev_fs() {
 528     local _func="$1"
 529     local _dev
 530     local _ret=1
 531
 532     [[ "${#host_fs_types[@]}" ]] || return 2
 533
 534     for _dev in "${!host_fs_types[@]}"; do
 535         $_func "$_dev" "${host_fs_types[$_dev]}" && _ret=0
 536     done
 537     return $_ret
 538 }
 539
 540 host_fs_all() {
 541     printf "%s\n" "${host_fs_types[@]}"
 542 }
 543
 544 # Walk all the slave relationships for a given block device.
 545 # Stop when our helper function returns success
 546 # $1 = function to call on every found block device
 547 # $2 = block device in major:minor format
 548 check_block_and_slaves() {
 549     local _x
 550     [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
 551     if ! lvm_internal_dev "$2"; then "$1" "$2" && return; fi
 552     check_vol_slaves "$@" && return 0
 553     if [[ -f /sys/dev/block/$2/../dev ]] && [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
 554         check_block_and_slaves "$1" "$(< "/sys/dev/block/$2/../dev")" && return 0
 555     fi
 556     for _x in /sys/dev/block/"$2"/slaves/*; do
 557         [[ -f $_x/dev ]] || continue
 558         [[ $_x/subsystem -ef /sys/class/block ]] || continue
 559         check_block_and_slaves "$1" "$(< "$_x/dev")" && return 0
 560     done
 561     return 1
 562 }
 563
 564 check_block_and_slaves_all() {
 565     local _x _ret=1
 566     [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
 567     if ! lvm_internal_dev "$2" && "$1" "$2"; then
 568         _ret=0
 569     fi
 570     check_vol_slaves_all "$@" && return 0
 571     if [[ -f /sys/dev/block/$2/../dev ]] && [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
 572         check_block_and_slaves_all "$1" "$(< "/sys/dev/block/$2/../dev")" && _ret=0
 573     fi
 574     for _x in /sys/dev/block/"$2"/slaves/*; do
 575         [[ -f $_x/dev ]] || continue
 576         [[ $_x/subsystem -ef /sys/class/block ]] || continue
 577         check_block_and_slaves_all "$1" "$(< "$_x/dev")" && _ret=0
 578     done
 579     return $_ret
 580 }
 581 # for_each_host_dev_and_slaves <func>
 582 # Execute "<func> <dev>" for every "<dev>" found
 583 # in ${host_devs[@]} and their slaves
 584 for_each_host_dev_and_slaves_all() {
 585     local _func="$1"
 586     local _dev
 587     local _ret=1
 588
 589     [[ "${host_devs[*]}" ]] || return 2
 590
 591     for _dev in "${host_devs[@]}"; do
 592         [[ -b $_dev ]] || continue
 593         if check_block_and_slaves_all "$_func" "$(get_maj_min "$_dev")"; then
 594             _ret=0
 595         fi
 596     done
 597     return $_ret
 598 }
 599
 600 for_each_host_dev_and_slaves() {
 601     local _func="$1"
 602     local _dev
 603
 604     [[ "${host_devs[*]}" ]] || return 2
 605
 606     for _dev in "${host_devs[@]}"; do
 607         [[ -b $_dev ]] || continue
 608         check_block_and_slaves "$_func" "$(get_maj_min "$_dev")" && return 0
 609     done
 610     return 1
 611 }
 612
 613 # ugly workaround for the lvm design
 614 # There is no volume group device,
 615 # so, there are no slave devices for volume groups.
 616 # Logical volumes only have the slave devices they really live on,
 617 # but you cannot create the logical volume without the volume group.
 618 # And the volume group might be bigger than the devices the LV needs.
 619 check_vol_slaves() {
 620     local _vg _pv _dm _majmin
 621     _majmin="$2"
 622     _dm=/sys/dev/block/$_majmin/dm
 623     [[ -f $_dm/uuid && $(< "$_dm"/uuid) =~ LVM-* ]] || return 1
 624     _vg=$(dmsetup splitname --noheadings -o vg_name "$(< "$_dm/name")")
 625     # strip space
 626     _vg="${_vg//[[:space:]]/}"
 627     if [[ $_vg ]]; then
 628         for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2> /dev/null); do
 629             check_block_and_slaves "$1" "$(get_maj_min "$_pv")" && return 0
 630         done
 631     fi
 632     return 1
 633 }
 634
 635 check_vol_slaves_all() {
 636     local _vg _pv _majmin
 637     _majmin="$2"
 638     _dm="/sys/dev/block/$_majmin/dm"
 639     [[ -f $_dm/uuid && $(< "$_dm"/uuid) =~ LVM-* ]] || return 1
 640     _vg=$(dmsetup splitname --noheadings -o vg_name "$(< "$_dm/name")")
 641     # strip space
 642     _vg="${_vg//[[:space:]]/}"
 643     if [[ $_vg ]]; then
 644         # when filter/global_filter is set, lvm may be failed
 645         if ! lvm lvs --noheadings -o vg_name "$_vg" 2> /dev/null 1> /dev/null; then
 646             return 1
 647         fi
 648
 649         for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2> /dev/null); do
 650             check_block_and_slaves_all "$1" "$(get_maj_min "$_pv")"
 651         done
 652         return 0
 653     fi
 654     return 1
 655 }
 656
 657 # fs_get_option <filesystem options> <search for option>
 658 # search for a specific option in a bunch of filesystem options
 659 # and return the value
 660 fs_get_option() {
 661     local _fsopts=$1
 662     local _option=$2
 663     local OLDIFS="$IFS"
 664     IFS=,
 665     # shellcheck disable=SC2086
 666     set -- $_fsopts
 667     IFS="$OLDIFS"
 668     while [ $# -gt 0 ]; do
 669         case $1 in
 670             $_option=*)
 671                 echo "${1#${_option}=}"
 672                 break
 673                 ;;
 674         esac
 675         shift
 676     done
 677 }
 678
 679 check_kernel_config() {
 680     local _config_opt="$1"
 681     local _config_file
 682     [[ -f $dracutsysrootdir/boot/config-$kernel ]] \
 683         && _config_file="/boot/config-$kernel"
 684     [[ -f $dracutsysrootdir/lib/modules/$kernel/config ]] \
 685         && _config_file="/lib/modules/$kernel/config"
 686
 687     # no kernel config file, so return true
 688     [[ $_config_file ]] || return 0
 689
 690     grep -q -F "${_config_opt}=" "$dracutsysrootdir$_config_file" && return 0
 691     return 1
 692 }
 693
 694 # 0 if the kernel module is either built-in or available
 695 # 1 if the kernel module is not enabled
 696 check_kernel_module() {
 697     modprobe -S "$kernel" --dry-run "$1" &> /dev/null || return 1
 698 }
 699
 700 # get_cpu_vendor
 701 # Only two values are returned: AMD or Intel
 702 get_cpu_vendor() {
 703     if grep -qE AMD /proc/cpuinfo; then
 704         printf "AMD"
 705     fi
 706     if grep -qE Intel /proc/cpuinfo; then
 707         printf "Intel"
 708     fi
 709 }
 710
 711 # get_host_ucode
 712 # Get the hosts' ucode file based on the /proc/cpuinfo
 713 get_ucode_file() {
 714     local family
 715     local model
 716     local stepping
 717     family=$(grep -E "cpu family" /proc/cpuinfo | head -1 | sed "s/.*:\ //")
 718     model=$(grep -E "model" /proc/cpuinfo | grep -v name | head -1 | sed "s/.*:\ //")
 719     stepping=$(grep -E "stepping" /proc/cpuinfo | head -1 | sed "s/.*:\ //")
 720
 721     if [[ "$(get_cpu_vendor)" == "AMD" ]]; then
 722         if [[ $family -ge 21 ]]; then
 723             printf "microcode_amd_fam%xh.bin" "$family"
 724         else
 725             printf "microcode_amd.bin"
 726         fi
 727     fi
 728     if [[ "$(get_cpu_vendor)" == "Intel" ]]; then
 729         # The /proc/cpuinfo are in decimal.
 730         printf "%02x-%02x-%02x" "${family}" "${model}" "${stepping}"
 731     fi
 732 }
 733
 734 # Not every device in /dev/mapper should be examined.
 735 # If it is an LVM device, touch only devices which have /dev/VG/LV symlink.
 736 lvm_internal_dev() {
 737     local dev_dm_dir=/sys/dev/block/$1/dm
 738     [[ ! -f $dev_dm_dir/uuid || $(< "$dev_dm_dir"/uuid) != LVM-* ]] && return 1 # Not an LVM device
 739     local DM_VG_NAME DM_LV_NAME DM_LV_LAYER
 740     eval "$(dmsetup splitname --nameprefixes --noheadings --rows "$(< "$dev_dm_dir"/name)" 2> /dev/null)"
 741     [[ ${DM_VG_NAME} ]] && [[ ${DM_LV_NAME} ]] || return 0 # Better skip this!
 742     [[ ${DM_LV_LAYER} ]] || [[ ! -L /dev/${DM_VG_NAME}/${DM_LV_NAME} ]]
 743 }
 744
 745 btrfs_devs() {
 746     local _mp="$1"
 747     btrfs device usage "$_mp" \
 748         | while read -r _dev _; do
 749             str_starts "$_dev" "/" || continue
 750             _dev=${_dev%,}
 751             printf -- "%s\n" "$_dev"
 752         done
 753 }
 754
 755 iface_for_remote_addr() {
 756     # shellcheck disable=SC2046
 757     set -- $(ip -o route get to "$1")
 758     echo "$3"
 759 }
 760
 761 local_addr_for_remote_addr() {
 762     # shellcheck disable=SC2046
 763     set -- $(ip -o route get to "$1")
 764     echo "$5"
 765 }
 766
 767 peer_for_addr() {
 768     local addr=$1
 769     local qtd
 770
 771     # quote periods in IPv4 address
 772     qtd=${addr//./\\.}
 773     ip -o addr show \
 774         | sed -n 's%^.* '"$qtd"' peer \([0-9a-f.:]\{1,\}\(/[0-9]*\)\?\).*$%\1%p'
 775 }
 776
 777 netmask_for_addr() {
 778     local addr=$1
 779     local qtd
 780
 781     # quote periods in IPv4 address
 782     qtd=${addr//./\\.}
 783     ip -o addr show | sed -n 's,^.* '"$qtd"'/\([0-9]*\) .*$,\1,p'
 784 }
 785
 786 gateway_for_iface() {
 787     local ifname=$1 addr=$2
 788
 789     case $addr in
 790         *.*) proto=4 ;;
 791         *:*) proto=6 ;;
 792         *) return ;;
 793     esac
 794     ip -o -$proto route show \
 795         | sed -n "s/^default via \([0-9a-z.:]\{1,\}\) dev $ifname .*\$/\1/p"
 796 }
 797
 798 # This works only for ifcfg-style network configuration!
 799 bootproto_for_iface() {
 800     local ifname=$1
 801     local dir
 802
 803     # follow ifcfg settings for boot protocol
 804     for dir in network-scripts network; do
 805         [ -f "/etc/sysconfig/$dir/ifcfg-$ifname" ] && {
 806             sed -n "s/BOOTPROTO=[\"']\?\([[:alnum:]]\{1,\}\)[\"']\?.*\$/\1/p" \
 807                 "/etc/sysconfig/$dir/ifcfg-$ifname"
 808             return
 809         }
 810     done
 811 }
 812
 813 is_unbracketed_ipv6_address() {
 814     strglob "$1" '*:*' && ! strglob "$1" '\[*:*\]'
 815 }
 816
 817 # Create an ip= string to set up networking such that the given
 818 # remote address can be reached
 819 ip_params_for_remote_addr() {
 820     local remote_addr=$1
 821     local ifname local_addr peer netmask gateway ifmac
 822
 823     [[ $remote_addr ]] || return 1
 824     ifname=$(iface_for_remote_addr "$remote_addr")
 825     [[ $ifname ]] || {
 826         berror "failed to determine interface to connect to $remote_addr"
 827         return 1
 828     }
 829
 830     # ifname clause to bind the interface name to a MAC address
 831     if [ -d "/sys/class/net/$ifname/bonding" ]; then
 832         dinfo "Found bonded interface '${ifname}'. Make sure to provide an appropriate 'bond=' cmdline."
 833     elif [ -e "/sys/class/net/$ifname/address" ]; then
 834         ifmac=$(cat "/sys/class/net/$ifname/address")
 835         [[ $ifmac ]] && printf 'ifname=%s:%s ' "${ifname}" "${ifmac}"
 836     fi
 837
 838     bootproto=$(bootproto_for_iface "$ifname")
 839     case $bootproto in
 840         dhcp | dhcp6 | auto6) ;;
 841         dhcp4)
 842             bootproto=dhcp
 843             ;;
 844         static* | "")
 845             bootproto=
 846             ;;
 847         *)
 848             derror "bootproto \"$bootproto\" is unsupported by dracut, trying static configuration"
 849             bootproto=
 850             ;;
 851     esac
 852     if [[ $bootproto ]]; then
 853         printf 'ip=%s:%s ' "${ifname}" "${bootproto}"
 854     else
 855         local_addr=$(local_addr_for_remote_addr "$remote_addr")
 856         [[ $local_addr ]] || {
 857             berror "failed to determine local address to connect to $remote_addr"
 858             return 1
 859         }
 860         peer=$(peer_for_addr "$local_addr")
 861         # Set peer or netmask, but not both
 862         [[ $peer ]] || netmask=$(netmask_for_addr "$local_addr")
 863         gateway=$(gateway_for_iface "$ifname" "$local_addr")
 864         # Quote IPv6 addresses with brackets
 865         is_unbracketed_ipv6_address "$local_addr" && local_addr="[$local_addr]"
 866         is_unbracketed_ipv6_address "$peer" && peer="[$peer]"
 867         is_unbracketed_ipv6_address "$gateway" && gateway="[$gateway]"
 868         printf 'ip=%s:%s:%s:%s::%s:none ' \
 869             "${local_addr}" "${peer}" "${gateway}" "${netmask}" "${ifname}"
 870     fi
 871
 872 }
 873
 874 # block_is_nbd <maj:min>
 875 # Check whether $1 is an nbd device
 876 block_is_nbd() {
 877     [[ -b /dev/block/$1 && $1 == 43:* ]]
 878 }
 879
 880 # block_is_iscsi <maj:min>
 881 # Check whether $1 is an nbd device
 882 block_is_iscsi() {
 883     local _dir
 884     local _dev=$1
 885     [[ -L "/sys/dev/block/$_dev" ]] || return
 886     _dir="$(readlink -f "/sys/dev/block/$_dev")" || return
 887     until [[ -d "$_dir/sys" || -d "$_dir/iscsi_session" ]]; do
 888         _dir="$_dir/.."
 889     done
 890     [[ -d "$_dir/iscsi_session" ]]
 891 }
 892
 893 # block_is_fcoe <maj:min>
 894 # Check whether $1 is an FCoE device
 895 # Will not work for HBAs that hide the ethernet aspect
 896 # completely and present a pure FC device
 897 block_is_fcoe() {
 898     local _dir
 899     local _dev=$1
 900     [[ -L "/sys/dev/block/$_dev" ]] || return
 901     _dir="$(readlink -f "/sys/dev/block/$_dev")"
 902     until [[ -d "$_dir/sys" ]]; do
 903         _dir="$_dir/.."
 904         if [[ -d "$_dir/subsystem" ]]; then
 905             subsystem=$(basename "$(readlink "$_dir"/subsystem)")
 906             [[ $subsystem == "fcoe" ]] && return 0
 907         fi
 908     done
 909     return 1
 910 }
 911
 912 # block_is_netdevice <maj:min>
 913 # Check whether $1 is a net device
 914 block_is_netdevice() {
 915     block_is_nbd "$1" || block_is_iscsi "$1" || block_is_fcoe "$1"
 916 }
 917
 918 # get the corresponding kernel modules of a /sys/class/*/* or/dev/* device
 919 get_dev_module() {
 920     udevadm info -a "$1" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p'
 921 }