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 if [[ $DRACUT_KERNEL_LAZY ]] && ! [[ $DRACUT_KERNEL_LAZY_HASHDIR ]]; then
  23     if ! [[ -d "$initdir/.kernelmodseen" ]]; then
  24         mkdir -p "$initdir/.kernelmodseen"
  25     fi
  26     DRACUT_KERNEL_LAZY_HASHDIR="$initdir/.kernelmodseen"
  27 fi
  28
  29 if [[ $initdir ]] && ! [[ -d $initdir ]]; then
  30     mkdir -p "$initdir"
  31 fi
  32
  33 # Generic substring function.  If $2 is in $1, return 0.
  34 strstr() { [[ $1 = *"$2"* ]]; }
  35 # Generic glob matching function. If glob pattern $2 matches anywhere in $1, OK
  36 strglobin() { [[ $1 = *$2* ]]; }
  37 # Generic glob matching function. If glob pattern $2 matches all of $1, OK
  38 strglob() { [[ $1 = $2 ]]; }
  39
  40 # helper function for check() in module-setup.sh
  41 # to check for required installed binaries
  42 # issues a standardized warning message
  43 require_binaries() {
  44     local _module_name="${moddir##*/}"
  45     local _ret=0
  46
  47     if [[ "$1" = "-m" ]]; then
  48         _module_name="$2"
  49         shift 2
  50     fi
  51
  52     for cmd in "$@"; do
  53         if ! find_binary "$cmd" &>/dev/null; then
  54             dinfo "dracut module '${_module_name#[0-9][0-9]}' will not be installed, because command '$cmd' could not be found!"
  55             ((_ret++))
  56         fi
  57     done
  58     return $_ret
  59 }
  60
  61 require_any_binary() {
  62     local _module_name="${moddir##*/}"
  63     local _ret=1
  64
  65     if [[ "$1" = "-m" ]]; then
  66         _module_name="$2"
  67         shift 2
  68     fi
  69
  70     for cmd in "$@"; do
  71         if find_binary "$cmd" &>/dev/null; then
  72             _ret=0
  73             break
  74         fi
  75     done
  76
  77     if (( $_ret != 0 )); then
  78         dinfo "$_module_name: Could not find any command of '$@'!"
  79         return 1
  80     fi
  81
  82     return 0
  83 }
  84
  85 # find a binary.  If we were not passed the full path directly,
  86 # search in the usual places to find the binary.
  87 find_binary() {
  88     if [[ -z ${1##/*} ]]; then
  89         if [[ -x $1 ]] || { [[ "$1" == *.so* ]] && ldd "$1" &>/dev/null; };  then
  90             printf "%s\n" "$1"
  91             return 0
  92         fi
  93     fi
  94
  95     type -P "${1##*/}"
  96 }
  97
  98 if ! [[ $dracutbasedir ]]; then
  99     dracutbasedir=${BASH_SOURCE[0]%/*}
 100     [[ $dracutbasedir = "dracut-functions" ]] && dracutbasedir="."
 101     [[ $dracutbasedir ]] || dracutbasedir="."
 102     dracutbasedir="$(readlink -f $dracutbasedir)"
 103 fi
 104
 105 ldconfig_paths()
 106 {
 107     local a i
 108     declare -A a
 109     for i in $(
 110         ldconfig -pN 2>/dev/null | grep -F '=>' | grep -E -v '/(lib|lib64|usr/lib|usr/lib64)/[^/]*$' | while read a b c d; do
 111             d=${d%/*}
 112             printf "%s\n" "$d";
 113         done
 114     ); do
 115         a["$i"]=1;
 116     done;
 117     printf "%s\n" ${!a[@]}
 118 }
 119
 120 # Detect lib paths
 121 if ! [[ $libdirs ]] ; then
 122     if [[ "$(ldd /bin/sh)" == */lib64/* ]] &>/dev/null \
 123         && [[ -d /lib64 ]]; then
 124         libdirs+=" /lib64"
 125         [[ -d /usr/lib64 ]] && libdirs+=" /usr/lib64"
 126     else
 127         libdirs+=" /lib"
 128         [[ -d /usr/lib ]] && libdirs+=" /usr/lib"
 129     fi
 130
 131     libdirs+=" $(ldconfig_paths)"
 132
 133     export libdirs
 134 fi
 135
 136 if ! [[ $kernel ]]; then
 137     kernel=$(uname -r)
 138     export kernel
 139 fi
 140
 141 # Version comparision function.  Assumes Linux style version scheme.
 142 # $1 = version a
 143 # $2 = comparision op (gt, ge, eq, le, lt, ne)
 144 # $3 = version b
 145 vercmp() {
 146     local _n1=(${1//./ }) _op=$2 _n2=(${3//./ }) _i _res
 147
 148     for ((_i=0; ; _i++))
 149     do
 150         if [[ ! ${_n1[_i]}${_n2[_i]} ]]; then _res=0
 151         elif ((${_n1[_i]:-0} > ${_n2[_i]:-0})); then _res=1
 152         elif ((${_n1[_i]:-0} < ${_n2[_i]:-0})); then _res=2
 153         else continue
 154         fi
 155         break
 156     done
 157
 158     case $_op in
 159         gt) ((_res == 1));;
 160         ge) ((_res != 2));;
 161         eq) ((_res == 0));;
 162         le) ((_res != 1));;
 163         lt) ((_res == 2));;
 164         ne) ((_res != 0));;
 165     esac
 166 }
 167
 168 srcmods="/lib/modules/$kernel/"
 169
 170 [[ $drivers_dir ]] && {
 171     if ! command -v kmod &>/dev/null && vercmp "$(modprobe --version | cut -d' ' -f3)" lt 3.7; then
 172         dfatal 'To use --kmoddir option module-init-tools >= 3.7 is required.'
 173         exit 1
 174     fi
 175     srcmods="$drivers_dir"
 176 }
 177 export srcmods
 178
 179 if ! type dinfo >/dev/null 2>&1; then
 180     . "$dracutbasedir/dracut-logger.sh"
 181     dlog_init
 182 fi
 183
 184 if ! [[ $initdir ]]; then
 185     dfatal "initdir not set"
 186     exit 1
 187 fi
 188
 189 # export standard hookdirs
 190 [[ $hookdirs ]] || {
 191     hookdirs="cmdline pre-udev pre-trigger netroot "
 192     hookdirs+="initqueue initqueue/settled initqueue/online initqueue/finished initqueue/timeout "
 193     hookdirs+="pre-mount pre-pivot cleanup mount "
 194     hookdirs+="emergency shutdown-emergency pre-shutdown shutdown "
 195     export hookdirs
 196 }
 197
 198 dracut_need_initqueue() {
 199     >"$initdir/lib/dracut/need-initqueue"
 200 }
 201
 202 dracut_module_included() {
 203     [[ " $mods_to_load $modules_loaded " == *\ $*\ * ]]
 204 }
 205
 206 # Create all subdirectories for given path without creating the last element.
 207 # $1 = path
 208 mksubdirs() {
 209     [[ -e ${1%/*} ]] || mkdir -m 0755 -p -- "${1%/*}"
 210 }
 211
 212 # is_func <command>
 213 # Check whether $1 is a function.
 214 is_func() {
 215     [[ "$(type -t "$1")" = "function" ]]
 216 }
 217
 218 # Function prints global variables in format name=value line by line.
 219 # $@ = list of global variables' name
 220 print_vars() {
 221     local _var _value
 222
 223     for _var in "$@"
 224     do
 225         eval printf -v _value "%s" \""\$$_var"\"
 226         [[ ${_value} ]] && printf '%s="%s"\n' "$_var" "$_value"
 227     done
 228 }
 229
 230 # normalize_path <path>
 231 # Prints the normalized path, where it removes any duplicated
 232 # and trailing slashes.
 233 # Example:
 234 # $ normalize_path ///test/test//
 235 # /test/test
 236 normalize_path() {
 237     shopt -q -s extglob
 238     set -- "${1//+(\/)//}"
 239     shopt -q -u extglob
 240     printf "%s\n" "${1%/}"
 241 }
 242
 243 # convert_abs_rel <from> <to>
 244 # Prints the relative path, when creating a symlink to <to> from <from>.
 245 # Example:
 246 # $ convert_abs_rel /usr/bin/test /bin/test-2
 247 # ../../bin/test-2
 248 # $ ln -s $(convert_abs_rel /usr/bin/test /bin/test-2) /usr/bin/test
 249 convert_abs_rel() {
 250     local __current __absolute __abssize __cursize __newpath
 251     local -i __i __level
 252
 253     set -- "$(normalize_path "$1")" "$(normalize_path "$2")"
 254
 255     # corner case #1 - self looping link
 256     [[ "$1" == "$2" ]] && { printf "%s\n" "${1##*/}"; return; }
 257
 258     # corner case #2 - own dir link
 259     [[ "${1%/*}" == "$2" ]] && { printf ".\n"; return; }
 260
 261     IFS="/" __current=($1)
 262     IFS="/" __absolute=($2)
 263
 264     __abssize=${#__absolute[@]}
 265     __cursize=${#__current[@]}
 266
 267     while [[ "${__absolute[__level]}" == "${__current[__level]}" ]]
 268     do
 269         (( __level++ ))
 270         if (( __level > __abssize || __level > __cursize ))
 271         then
 272             break
 273         fi
 274     done
 275
 276     for ((__i = __level; __i < __cursize-1; __i++))
 277     do
 278         if ((__i > __level))
 279         then
 280             __newpath=$__newpath"/"
 281         fi
 282         __newpath=$__newpath".."
 283     done
 284
 285     for ((__i = __level; __i < __abssize; __i++))
 286     do
 287         if [[ -n $__newpath ]]
 288         then
 289             __newpath=$__newpath"/"
 290         fi
 291         __newpath=$__newpath${__absolute[__i]}
 292     done
 293
 294     printf "%s\n" "$__newpath"
 295 }
 296
 297 if [[ "$(ln --help)" == *--relative* ]]; then
 298     ln_r() {
 299         ln -sfnr "${initdir}/$1" "${initdir}/$2"
 300     }
 301 else
 302     ln_r() {
 303         local _source=$1
 304         local _dest=$2
 305         [[ -d "${_dest%/*}" ]] && _dest=$(readlink -f "${_dest%/*}")/${_dest##*/}
 306         ln -sfn -- "$(convert_abs_rel "${_dest}" "${_source}")" "${initdir}/${_dest}"
 307     }
 308 fi
 309
 310 # get_fs_env <device>
 311 # Get and the ID_FS_TYPE variable from udev for a device.
 312 # Example:
 313 # $ get_fs_env /dev/sda2
 314 # ext4
 315 get_fs_env() {
 316     local evalstr
 317     local found
 318
 319     [[ $1 ]] || return
 320     unset ID_FS_TYPE
 321     ID_FS_TYPE=$(blkid -u filesystem -o export -- "$1" \
 322         | while read line; do
 323             if [[ "$line" == TYPE\=* ]]; then
 324                 printf "%s" "${line#TYPE=}";
 325                 exit 0;
 326             fi
 327             done)
 328     if [[ $ID_FS_TYPE ]]; then
 329         printf "%s" "$ID_FS_TYPE"
 330         return 0
 331     fi
 332     return 1
 333 }
 334
 335 # get_maj_min <device>
 336 # Prints the major and minor of a device node.
 337 # Example:
 338 # $ get_maj_min /dev/sda2
 339 # 8:2
 340 get_maj_min() {
 341     local _maj _min _majmin
 342     _majmin="$(stat -L -c '%t:%T' "$1" 2>/dev/null)"
 343     printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))"
 344 }
 345
 346
 347 # get_devpath_block <device>
 348 # get the DEVPATH in /sys of a block device
 349 get_devpath_block() {
 350     local _majmin _i
 351     _majmin=$(get_maj_min "$1")
 352
 353     for _i in /sys/block/*/dev /sys/block/*/*/dev; do
 354         [[ -e "$_i" ]] || continue
 355         if [[ "$_majmin" == "$(<"$_i")" ]]; then
 356             printf "%s" "${_i%/dev}"
 357             return 0
 358         fi
 359     done
 360     return 1
 361 }
 362
 363 # get a persistent path from a device
 364 get_persistent_dev() {
 365     local i _tmp _dev
 366
 367     _dev=$(get_maj_min "$1")
 368     [ -z "$_dev" ] && return
 369
 370     for i in \
 371         /dev/mapper/* \
 372         /dev/disk/${persistent_policy:-by-uuid}/* \
 373         /dev/disk/by-uuid/* \
 374         /dev/disk/by-label/* \
 375         /dev/disk/by-partuuid/* \
 376         /dev/disk/by-partlabel/* \
 377         /dev/disk/by-id/* \
 378         /dev/disk/by-path/* \
 379         ; do
 380         [[ -e "$i" ]] || continue
 381         [[ $i == /dev/mapper/control ]] && continue
 382         [[ $i == /dev/mapper/mpath* ]] && continue
 383         _tmp=$(get_maj_min "$i")
 384         if [ "$_tmp" = "$_dev" ]; then
 385             printf -- "%s" "$i"
 386             return
 387         fi
 388     done
 389     printf -- "%s" "$1"
 390 }
 391
 392 expand_persistent_dev() {
 393     local _dev=$1
 394
 395     case "$_dev" in
 396         LABEL=*)
 397             _dev="/dev/disk/by-label/${_dev#LABEL=}"
 398             ;;
 399         UUID=*)
 400             _dev="${_dev#UUID=}"
 401             _dev="${_dev,,}"
 402             _dev="/dev/disk/by-uuid/${_dev}"
 403             ;;
 404         PARTUUID=*)
 405             _dev="${_dev#PARTUUID=}"
 406             _dev="${_dev,,}"
 407             _dev="/dev/disk/by-partuuid/${_dev}"
 408             ;;
 409         PARTLABEL=*)
 410             _dev="/dev/disk/by-partlabel/${_dev#PARTLABEL=}"
 411             ;;
 412     esac
 413     printf "%s" "$_dev"
 414 }
 415
 416 shorten_persistent_dev() {
 417     local _dev="$1"
 418     case "$_dev" in
 419         /dev/disk/by-uuid/*)
 420             printf "%s" "UUID=${_dev##*/}";;
 421         /dev/disk/by-label/*)
 422             printf "%s" "LABEL=${_dev##*/}";;
 423         /dev/disk/by-partuuid/*)
 424             printf "%s" "PARTUUID=${_dev##*/}";;
 425         /dev/disk/by-partlabel/*)
 426             printf "%s" "PARTLABEL=${_dev##*/}";;
 427         *)
 428             printf "%s" "$_dev";;
 429     esac
 430 }
 431
 432 # find_block_device <mountpoint>
 433 # Prints the major and minor number of the block device
 434 # for a given mountpoint.
 435 # Unless $use_fstab is set to "yes" the functions
 436 # uses /proc/self/mountinfo as the primary source of the
 437 # information and only falls back to /etc/fstab, if the mountpoint
 438 # is not found there.
 439 # Example:
 440 # $ find_block_device /usr
 441 # 8:4
 442 find_block_device() {
 443     local _majmin _dev _majmin _find_mpt
 444     _find_mpt="$1"
 445     if [[ $use_fstab != yes ]]; then
 446         [[ -d $_find_mpt/. ]]
 447         findmnt -e -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | { \
 448             while read _majmin _dev; do
 449                 if [[ -b $_dev ]]; then
 450                     if ! [[ $_majmin ]] || [[ $_majmin == 0:* ]]; then
 451                         _majmin=$(get_maj_min $_dev)
 452                     fi
 453                     if [[ $_majmin ]]; then
 454                         printf "%s\n" "$_majmin"
 455                     else
 456                         printf "%s\n" "$_dev"
 457                     fi
 458                     return 0
 459                 fi
 460                 if [[ $_dev = *:* ]]; then
 461                     printf "%s\n" "$_dev"
 462                     return 0
 463                 fi
 464             done; return 1; } && return 0
 465     fi
 466     # fall back to /etc/fstab
 467
 468     findmnt -e --fstab -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | { \
 469         while read _majmin _dev; do
 470             if ! [[ $_dev ]]; then
 471                 _dev="$_majmin"
 472                 unset _majmin
 473             fi
 474             if [[ -b $_dev ]]; then
 475                 [[ $_majmin ]] || _majmin=$(get_maj_min $_dev)
 476                 if [[ $_majmin ]]; then
 477                     printf "%s\n" "$_majmin"
 478                 else
 479                     printf "%s\n" "$_dev"
 480                 fi
 481                 return 0
 482             fi
 483             if [[ $_dev = *:* ]]; then
 484                 printf "%s\n" "$_dev"
 485                 return 0
 486             fi
 487         done; return 1; } && return 0
 488
 489     return 1
 490 }
 491
 492 # find_mp_fstype <mountpoint>
 493 # Echo the filesystem type for a given mountpoint.
 494 # /proc/self/mountinfo is taken as the primary source of information
 495 # and /etc/fstab is used as a fallback.
 496 # No newline is appended!
 497 # Example:
 498 # $ find_mp_fstype /;echo
 499 # ext4
 500 find_mp_fstype() {
 501     local _fs
 502
 503     if [[ $use_fstab != yes ]]; then
 504         findmnt -e -v -n -o 'FSTYPE' --target "$1" | { \
 505             while read _fs; do
 506                 [[ $_fs ]] || continue
 507                 [[ $_fs = "autofs" ]] && continue
 508                 printf "%s" "$_fs"
 509                 return 0
 510             done; return 1; } && return 0
 511     fi
 512
 513     findmnt --fstab -e -v -n -o 'FSTYPE' --target "$1" | { \
 514         while read _fs; do
 515             [[ $_fs ]] || continue
 516             [[ $_fs = "autofs" ]] && continue
 517             printf "%s" "$_fs"
 518             return 0
 519         done; return 1; } && return 0
 520
 521     return 1
 522 }
 523
 524 # find_dev_fstype <device>
 525 # Echo the filesystem type for a given device.
 526 # /proc/self/mountinfo is taken as the primary source of information
 527 # and /etc/fstab is used as a fallback.
 528 # No newline is appended!
 529 # Example:
 530 # $ find_dev_fstype /dev/sda2;echo
 531 # ext4
 532 find_dev_fstype() {
 533     local _find_dev _fs
 534     _find_dev="$1"
 535     if ! [[ "$_find_dev" = /dev* ]]; then
 536         [[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
 537     fi
 538
 539     if [[ $use_fstab != yes ]]; then
 540         findmnt -e -v -n -o 'FSTYPE' --source "$_find_dev" | { \
 541             while read _fs; do
 542                 [[ $_fs ]] || continue
 543                 [[ $_fs = "autofs" ]] && continue
 544                 printf "%s" "$_fs"
 545                 return 0
 546             done; return 1; } && return 0
 547     fi
 548
 549     findmnt --fstab -e -v -n -o 'FSTYPE' --source "$_find_dev" | { \
 550         while read _fs; do
 551             [[ $_fs ]] || continue
 552             [[ $_fs = "autofs" ]] && continue
 553             printf "%s" "$_fs"
 554             return 0
 555         done; return 1; } && return 0
 556
 557     return 1
 558 }
 559
 560 # find_mp_fsopts <mountpoint>
 561 # Echo the filesystem options for a given mountpoint.
 562 # /proc/self/mountinfo is taken as the primary source of information
 563 # and /etc/fstab is used as a fallback.
 564 # No newline is appended!
 565 # Example:
 566 # $ find_mp_fsopts /;echo
 567 # rw,relatime,discard,data=ordered
 568 find_mp_fsopts() {
 569     if [[ $use_fstab != yes ]]; then
 570         findmnt -e -v -n -o 'OPTIONS' --target "$1" 2>/dev/null && return 0
 571     fi
 572
 573     findmnt --fstab -e -v -n -o 'OPTIONS' --target "$1"
 574 }
 575
 576 # find_dev_fsopts <device>
 577 # Echo the filesystem options for a given device.
 578 # /proc/self/mountinfo is taken as the primary source of information
 579 # and /etc/fstab is used as a fallback.
 580 # Example:
 581 # $ find_dev_fsopts /dev/sda2
 582 # rw,relatime,discard,data=ordered
 583 find_dev_fsopts() {
 584     local _find_dev _opts
 585     _find_dev="$1"
 586     if ! [[ "$_find_dev" = /dev* ]]; then
 587         [[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
 588     fi
 589
 590     if [[ $use_fstab != yes ]]; then
 591         findmnt -e -v -n -o 'OPTIONS' --source "$_find_dev" 2>/dev/null && return 0
 592     fi
 593
 594     findmnt --fstab -e -v -n -o 'OPTIONS' --source "$_find_dev"
 595 }
 596
 597
 598 # finds the major:minor of the block device backing the root filesystem.
 599 find_root_block_device() { find_block_device /; }
 600
 601 # for_each_host_dev_fs <func>
 602 # Execute "<func> <dev> <filesystem>" for every "<dev> <fs>" pair found
 603 # in ${host_fs_types[@]}
 604 for_each_host_dev_fs()
 605 {
 606     local _func="$1"
 607     local _dev
 608     local _ret=1
 609
 610     [[ "${!host_fs_types[@]}" ]] || return 0
 611
 612     for _dev in "${!host_fs_types[@]}"; do
 613         $_func "$_dev" "${host_fs_types[$_dev]}" && _ret=0
 614     done
 615     return $_ret
 616 }
 617
 618 host_fs_all()
 619 {
 620     printf "%s\n" "${host_fs_types[@]}"
 621 }
 622
 623 # Walk all the slave relationships for a given block device.
 624 # Stop when our helper function returns success
 625 # $1 = function to call on every found block device
 626 # $2 = block device in major:minor format
 627 check_block_and_slaves() {
 628     local _x
 629     [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
 630     if ! lvm_internal_dev $2; then "$1" $2 && return; fi
 631     check_vol_slaves "$@" && return 0
 632     if [[ -f /sys/dev/block/$2/../dev ]]; then
 633         check_block_and_slaves $1 $(<"/sys/dev/block/$2/../dev") && return 0
 634     fi
 635     [[ -d /sys/dev/block/$2/slaves ]] || return 1
 636     for _x in /sys/dev/block/$2/slaves/*/dev; do
 637         [[ -f $_x ]] || continue
 638         check_block_and_slaves $1 $(<"$_x") && return 0
 639     done
 640     return 1
 641 }
 642
 643 check_block_and_slaves_all() {
 644     local _x _ret=1
 645     [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
 646     if ! lvm_internal_dev $2 && "$1" $2; then
 647         _ret=0
 648     fi
 649     check_vol_slaves "$@" && return 0
 650     if [[ -f /sys/dev/block/$2/../dev ]]; then
 651         check_block_and_slaves_all $1 $(<"/sys/dev/block/$2/../dev") && _ret=0
 652     fi
 653     [[ -d /sys/dev/block/$2/slaves ]] || return 1
 654     for _x in /sys/dev/block/$2/slaves/*/dev; do
 655         [[ -f $_x ]] || continue
 656         check_block_and_slaves_all $1 $(<"$_x") && _ret=0
 657     done
 658     return $_ret
 659 }
 660 # for_each_host_dev_and_slaves <func>
 661 # Execute "<func> <dev>" for every "<dev>" found
 662 # in ${host_devs[@]} and their slaves
 663 for_each_host_dev_and_slaves_all()
 664 {
 665     local _func="$1"
 666     local _dev
 667     local _ret=1
 668
 669     [[ "${host_devs[@]}" ]] || return 0
 670
 671     for _dev in ${host_devs[@]}; do
 672         [[ -b "$_dev" ]] || continue
 673         if check_block_and_slaves_all $_func $(get_maj_min $_dev); then
 674             _ret=0
 675         fi
 676     done
 677     return $_ret
 678 }
 679
 680 for_each_host_dev_and_slaves()
 681 {
 682     local _func="$1"
 683     local _dev
 684
 685     [[ "${host_devs[@]}" ]] || return 0
 686
 687     for _dev in ${host_devs[@]}; do
 688         [[ -b "$_dev" ]] || continue
 689         check_block_and_slaves $_func $(get_maj_min $_dev) && return 0
 690     done
 691     return 1
 692 }
 693
 694 # ugly workaround for the lvm design
 695 # There is no volume group device,
 696 # so, there are no slave devices for volume groups.
 697 # Logical volumes only have the slave devices they really live on,
 698 # but you cannot create the logical volume without the volume group.
 699 # And the volume group might be bigger than the devices the LV needs.
 700 check_vol_slaves() {
 701     local _lv _vg _pv
 702     for i in /dev/mapper/*; do
 703         [[ $i == /dev/mapper/control ]] && continue
 704         _lv=$(get_maj_min $i)
 705         if [[ $_lv = $2 ]]; then
 706             _vg=$(lvm lvs --noheadings -o vg_name $i 2>/dev/null)
 707             # strip space
 708             _vg=$(printf "%s\n" "$_vg")
 709             if [[ $_vg ]]; then
 710                 for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2>/dev/null)
 711                 do
 712                     check_block_and_slaves $1 $(get_maj_min $_pv) && return 0
 713                 done
 714             fi
 715         fi
 716     done
 717     return 1
 718 }
 719
 720 # fs_get_option <filesystem options> <search for option>
 721 # search for a specific option in a bunch of filesystem options
 722 # and return the value
 723 fs_get_option() {
 724     local _fsopts=$1
 725     local _option=$2
 726     local OLDIFS="$IFS"
 727     IFS=,
 728     set -- $_fsopts
 729     IFS="$OLDIFS"
 730     while [ $# -gt 0 ]; do
 731         case $1 in
 732             $_option=*)
 733                 echo ${1#${_option}=}
 734                 break
 735         esac
 736         shift
 737     done
 738 }
 739
 740 if ! [[ $DRACUT_INSTALL ]]; then
 741     DRACUT_INSTALL=$(find_binary dracut-install)
 742 fi
 743
 744 if ! [[ $DRACUT_INSTALL ]] && [[ -x $dracutbasedir/install/dracut-install ]]; then
 745     DRACUT_INSTALL=$dracutbasedir/install/dracut-install
 746 fi
 747
 748 if ! [[ -x $DRACUT_INSTALL ]]; then
 749     dfatal "dracut-install not found!"
 750     exit 10
 751 fi
 752
 753 [[ $DRACUT_RESOLVE_LAZY ]] || export DRACUT_RESOLVE_DEPS=1
 754 inst_dir() {
 755     [[ -e ${initdir}/"$1" ]] && return 0  # already there
 756     $DRACUT_INSTALL ${initdir:+-D "$initdir"} -d "$@"
 757     (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} -d "$@" || :
 758 }
 759
 760 inst() {
 761     local _hostonly_install
 762     if [[ "$1" == "-H" ]]; then
 763         _hostonly_install="-H"
 764         shift
 765     fi
 766     [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
 767     $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l} ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@"
 768     (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l} ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
 769 }
 770
 771 inst_simple() {
 772     local _hostonly_install
 773     if [[ "$1" == "-H" ]]; then
 774         _hostonly_install="-H"
 775         shift
 776     fi
 777     [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
 778     [[ -e $1 ]] || return 1  # no source
 779     $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${_hostonly_install:+-H} "$@"
 780     (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${_hostonly_install:+-H} "$@" || :
 781 }
 782
 783 inst_symlink() {
 784     local _hostonly_install
 785     if [[ "$1" == "-H" ]]; then
 786         _hostonly_install="-H"
 787         shift
 788     fi
 789     [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
 790     [[ -L $1 ]] || return 1
 791     $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@"
 792     (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
 793 }
 794
 795 inst_multiple() {
 796     local _ret
 797     $DRACUT_INSTALL ${initdir:+-D "$initdir"} -a ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@"
 798     _ret=$?
 799     (($_ret != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} -a ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
 800     return $_ret
 801 }
 802
 803 dracut_install() {
 804     inst_multiple "$@"
 805 }
 806
 807 inst_library() {
 808     local _hostonly_install
 809     if [[ "$1" == "-H" ]]; then
 810         _hostonly_install="-H"
 811         shift
 812     fi
 813     [[ -e ${initdir}/"${2:-$1}" ]] && return 0  # already there
 814     [[ -e $1 ]] || return 1  # no source
 815     $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@"
 816     (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} ${_hostonly_install:+-H} "$@" || :
 817 }
 818
 819 inst_binary() {
 820     $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@"
 821     (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@" || :
 822 }
 823
 824 inst_script() {
 825     $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l} ${DRACUT_FIPS_MODE:+-f} "$@"
 826     (($? != 0)) && derror $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} ${DRACUT_RESOLVE_DEPS:+-l}  ${DRACUT_FIPS_MODE:+-f} "$@" || :
 827 }
 828
 829 mark_hostonly() {
 830     for i in "$@"; do
 831         echo "$i" >> "$initdir/lib/dracut/hostonly-files"
 832     done
 833 }
 834
 835 # find symlinks linked to given library file
 836 # $1 = library file
 837 # Function searches for symlinks by stripping version numbers appended to
 838 # library filename, checks if it points to the same target and finally
 839 # prints the list of symlinks to stdout.
 840 #
 841 # Example:
 842 # rev_lib_symlinks libfoo.so.8.1
 843 # output: libfoo.so.8 libfoo.so
 844 # (Only if libfoo.so.8 and libfoo.so exists on host system.)
 845 rev_lib_symlinks() {
 846     [[ ! $1 ]] && return 0
 847
 848     local fn="$1" orig="$(readlink -f "$1")" links=''
 849
 850     [[ ${fn} == *.so.* ]] || return 1
 851
 852     until [[ ${fn##*.} == so ]]; do
 853         fn="${fn%.*}"
 854         [[ -L ${fn} && $(readlink -f "${fn}") == ${orig} ]] && links+=" ${fn}"
 855     done
 856
 857     echo "${links}"
 858 }
 859
 860 # attempt to install any programs specified in a udev rule
 861 inst_rule_programs() {
 862     local _prog _bin
 863
 864     if grep -qE 'PROGRAM==?"[^ "]+' "$1"; then
 865         for _prog in $(grep -E 'PROGRAM==?"[^ "]+' "$1" | sed -r 's/.*PROGRAM==?"([^ "]+).*/\1/'); do
 866             _bin=""
 867             if [ -x ${udevdir}/$_prog ]; then
 868                 _bin=${udevdir}/$_prog
 869             elif [[ "${_prog/\$env\{/}" == "$_prog" ]]; then
 870                 _bin=$(find_binary "$_prog") || {
 871                     dinfo "Skipping program $_prog using in udev rule ${1##*/} as it cannot be found"
 872                     continue;
 873                 }
 874             fi
 875
 876             [[ $_bin ]] && inst_binary "$_bin"
 877         done
 878     fi
 879     if grep -qE 'RUN[+=]=?"[^ "]+' "$1"; then
 880         for _prog in $(grep -E 'RUN[+=]=?"[^ "]+' "$1" | sed -r 's/.*RUN[+=]=?"([^ "]+).*/\1/'); do
 881             _bin=""
 882             if [ -x ${udevdir}/$_prog ]; then
 883                 _bin=${udevdir}/$_prog
 884             elif [[ "${_prog/\$env\{/}" == "$_prog" ]] && [[ "${_prog}" != "/sbin/initqueue" ]]; then
 885                 _bin=$(find_binary "$_prog") || {
 886                     dinfo "Skipping program $_prog using in udev rule ${1##*/} as it cannot be found"
 887                     continue;
 888                 }
 889             fi
 890
 891             [[ $_bin ]] && inst_binary "$_bin"
 892         done
 893     fi
 894     if grep -qE 'IMPORT\{program\}==?"[^ "]+' "$1"; then
 895         for _prog in $(grep -E 'IMPORT\{program\}==?"[^ "]+' "$1" | sed -r 's/.*IMPORT\{program\}==?"([^ "]+).*/\1/'); do
 896             _bin=""
 897             if [ -x ${udevdir}/$_prog ]; then
 898                 _bin=${udevdir}/$_prog
 899             elif [[ "${_prog/\$env\{/}" == "$_prog" ]]; then
 900                 _bin=$(find_binary "$_prog") || {
 901                     dinfo "Skipping program $_prog using in udev rule ${1##*/} as it cannot be found"
 902                     continue;
 903                 }
 904             fi
 905
 906             [[ $_bin ]] && dracut_install "$_bin"
 907         done
 908     fi
 909 }
 910
 911 # attempt to install any programs specified in a udev rule
 912 inst_rule_group_owner() {
 913     local i
 914
 915     if grep -qE 'OWNER=?"[^ "]+' "$1"; then
 916         for i in $(grep -E 'OWNER=?"[^ "]+' "$1" | sed -r 's/.*OWNER=?"([^ "]+).*/\1/'); do
 917             if ! egrep -q "^$i:" "$initdir/etc/passwd" 2>/dev/null; then
 918                 egrep "^$i:" /etc/passwd 2>/dev/null >> "$initdir/etc/passwd"
 919             fi
 920         done
 921     fi
 922     if grep -qE 'GROUP=?"[^ "]+' "$1"; then
 923         for i in $(grep -E 'GROUP=?"[^ "]+' "$1" | sed -r 's/.*GROUP=?"([^ "]+).*/\1/'); do
 924             if ! egrep -q "^$i:" "$initdir/etc/group" 2>/dev/null; then
 925                 egrep "^$i:" /etc/group 2>/dev/null >> "$initdir/etc/group"
 926             fi
 927         done
 928     fi
 929 }
 930
 931 inst_rule_initqueue() {
 932     if grep -q -F initqueue "$1"; then
 933         dracut_need_initqueue
 934     fi
 935 }
 936
 937 # udev rules always get installed in the same place, so
 938 # create a function to install them to make life simpler.
 939 inst_rules() {
 940     local _target=/etc/udev/rules.d _rule _found
 941
 942     inst_dir "${udevdir}/rules.d"
 943     inst_dir "$_target"
 944     for _rule in "$@"; do
 945         if [ "${_rule#/}" = "$_rule" ]; then
 946             for r in ${udevdir}/rules.d ${hostonly:+/etc/udev/rules.d}; do
 947                 if [[ -e $r/$_rule ]]; then
 948                     _found="$r/$_rule"
 949                     inst_rule_programs "$_found"
 950                     inst_rule_group_owner "$_found"
 951                     inst_rule_initqueue "$_found"
 952                     inst_simple "$_found"
 953                 fi
 954             done
 955         fi
 956         for r in '' $dracutbasedir/rules.d/; do
 957             # skip rules without an absolute path
 958             [[ "${r}$_rule" != /* ]] && continue
 959
 960             if [[ -f ${r}$_rule ]]; then
 961                 _found="${r}$_rule"
 962                 inst_rule_programs "$_found"
 963                 inst_rule_group_owner "$_found"
 964                 inst_rule_initqueue "$_found"
 965                 inst_simple "$_found" "$_target/${_found##*/}"
 966             fi
 967         done
 968         [[ $_found ]] || dinfo "Skipping udev rule: $_rule"
 969     done
 970 }
 971
 972 inst_rules_wildcard() {
 973     local _target=/etc/udev/rules.d _rule _found
 974
 975     inst_dir "${udevdir}/rules.d"
 976     inst_dir "$_target"
 977     for _rule in ${udevdir}/rules.d/$1 ${dracutbasedir}/rules.d/$1 ; do
 978         if [[ -e $_rule ]]; then
 979             inst_rule_programs "$_rule"
 980             inst_rule_group_owner "$_rule"
 981             inst_rule_initqueue "$_rule"
 982             inst_simple "$_rule"
 983             _found=$_rule
 984         fi
 985     done
 986     if [ -n ${hostonly} ] ; then
 987         for _rule in ${_target}/$1 ; do
 988             if [[ -f $_rule ]]; then
 989                 inst_rule_programs "$_rule"
 990                 inst_rule_group_owner "$_rule"
 991                 inst_rule_initqueue "$_rule"
 992                 inst_simple "$_rule"
 993                 _found=$_rule
 994             fi
 995         done
 996     fi
 997     [[ $_found ]] || dinfo "Skipping udev rule: $_rule"
 998 }
 999
1000 prepare_udev_rules() {
1001     [ -z "$UDEVVERSION" ] && export UDEVVERSION=$(udevadm --version)
1002
1003     for f in "$@"; do
1004         f="${initdir}/etc/udev/rules.d/$f"
1005         [ -e "$f" ] || continue
1006         while read line; do
1007             if [ "${line%%IMPORT PATH_ID}" != "$line" ]; then
1008                 if [ $UDEVVERSION -ge 174 ]; then
1009                     printf '%sIMPORT{builtin}="path_id"\n' "${line%%IMPORT PATH_ID}"
1010                 else
1011                     printf '%sIMPORT{program}="path_id %%p"\n' "${line%%IMPORT PATH_ID}"
1012                 fi
1013             elif [ "${line%%IMPORT BLKID}" != "$line" ]; then
1014                 if [ $UDEVVERSION -ge 176 ]; then
1015                     printf '%sIMPORT{builtin}="blkid"\n' "${line%%IMPORT BLKID}"
1016                 else
1017                     printf '%sIMPORT{program}="/sbin/blkid -o udev -p $tempnode"\n' "${line%%IMPORT BLKID}"
1018                 fi
1019             else
1020                 echo "$line"
1021             fi
1022         done < "${f}" > "${f}.new"
1023         mv "${f}.new" "$f"
1024     done
1025 }
1026
1027 # install function specialized for hooks
1028 # $1 = type of hook, $2 = hook priority (lower runs first), $3 = hook
1029 # All hooks should be POSIX/SuS compliant, they will be sourced by init.
1030 inst_hook() {
1031     if ! [[ -f $3 ]]; then
1032         dfatal "Cannot install a hook ($3) that does not exist."
1033         dfatal "Aborting initrd creation."
1034         exit 1
1035     elif ! [[ "$hookdirs" == *$1* ]]; then
1036         dfatal "No such hook type $1. Aborting initrd creation."
1037         exit 1
1038     fi
1039     inst_simple "$3" "/lib/dracut/hooks/${1}/${2}-${3##*/}"
1040 }
1041
1042 # install any of listed files
1043 #
1044 # If first argument is '-d' and second some destination path, first accessible
1045 # source is installed into this path, otherwise it will installed in the same
1046 # path as source.  If none of listed files was installed, function return 1.
1047 # On first successful installation it returns with 0 status.
1048 #
1049 # Example:
1050 #
1051 # inst_any -d /bin/foo /bin/bar /bin/baz
1052 #
1053 # Lets assume that /bin/baz exists, so it will be installed as /bin/foo in
1054 # initramfs.
1055 inst_any() {
1056     local to f
1057
1058     [[ $1 = '-d' ]] && to="$2" && shift 2
1059
1060     for f in "$@"; do
1061         if [[ -e $f ]]; then
1062             [[ $to ]] && inst "$f" "$to" && return 0
1063             inst "$f" && return 0
1064         fi
1065     done
1066
1067     return 1
1068 }
1069
1070
1071 # inst_libdir_file [-n <pattern>] <file> [<file>...]
1072 # Install a <file> located on a lib directory to the initramfs image
1073 # -n <pattern> install matching files
1074 inst_libdir_file() {
1075     local _files
1076     if [[ "$1" == "-n" ]]; then
1077         local _pattern=$2
1078         shift 2
1079         for _dir in $libdirs; do
1080             for _i in "$@"; do
1081                 for _f in "$_dir"/$_i; do
1082                     [[ "$_f" =~ $_pattern ]] || continue
1083                     [[ -e "$_f" ]] && _files+="$_f "
1084                 done
1085             done
1086         done
1087     else
1088         for _dir in $libdirs; do
1089             for _i in "$@"; do
1090                 for _f in "$_dir"/$_i; do
1091                     [[ -e "$_f" ]] && _files+="$_f "
1092                 done
1093             done
1094         done
1095     fi
1096     [[ $_files ]] && inst_multiple $_files
1097 }
1098
1099
1100 # install function decompressing the target and handling symlinks
1101 # $@ = list of compressed (gz or bz2) files or symlinks pointing to such files
1102 #
1103 # Function install targets in the same paths inside overlay but decompressed
1104 # and without extensions (.gz, .bz2).
1105 inst_decompress() {
1106     local _src _cmd
1107
1108     for _src in $@
1109     do
1110         case ${_src} in
1111             *.gz) _cmd='gzip -f -d' ;;
1112             *.bz2) _cmd='bzip2 -d' ;;
1113             *) return 1 ;;
1114         esac
1115         inst_simple ${_src}
1116         # Decompress with chosen tool.  We assume that tool changes name e.g.
1117         # from 'name.gz' to 'name'.
1118         ${_cmd} "${initdir}${_src}"
1119     done
1120 }
1121
1122 # It's similar to above, but if file is not compressed, performs standard
1123 # install.
1124 # $@ = list of files
1125 inst_opt_decompress() {
1126     local _src
1127
1128     for _src in $@
1129     do
1130         inst_decompress "${_src}" || inst "${_src}"
1131     done
1132 }
1133
1134 # module_check <dracut module>
1135 # execute the check() function of module-setup.sh of <dracut module>
1136 # or the "check" script, if module-setup.sh is not found
1137 # "check $hostonly" is called
1138 module_check() {
1139     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1140     local _ret
1141     local _forced=0
1142     local _hostonly=$hostonly
1143     [ $# -eq 2 ] && _forced=$2
1144     [[ -d $_moddir ]] || return 1
1145     if [[ ! -f $_moddir/module-setup.sh ]]; then
1146         # if we do not have a check script, we are unconditionally included
1147         [[ -x $_moddir/check ]] || return 0
1148         [ $_forced -ne 0 ] && unset hostonly
1149         $_moddir/check $hostonly
1150         _ret=$?
1151     else
1152         unset check depends cmdline install installkernel
1153         check() { true; }
1154         . $_moddir/module-setup.sh
1155         is_func check || return 0
1156         [ $_forced -ne 0 ] && unset hostonly
1157         moddir=$_moddir check $hostonly
1158         _ret=$?
1159         unset check depends cmdline install installkernel
1160     fi
1161     hostonly=$_hostonly
1162     return $_ret
1163 }
1164
1165 # module_check_mount <dracut module>
1166 # execute the check() function of module-setup.sh of <dracut module>
1167 # or the "check" script, if module-setup.sh is not found
1168 # "mount_needs=1 check 0" is called
1169 module_check_mount() {
1170     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1171     local _ret
1172     mount_needs=1
1173     [[ -d $_moddir ]] || return 1
1174     if [[ ! -f $_moddir/module-setup.sh ]]; then
1175         # if we do not have a check script, we are unconditionally included
1176         [[ -x $_moddir/check ]] || return 0
1177         mount_needs=1 $_moddir/check 0
1178         _ret=$?
1179     else
1180         unset check depends cmdline install installkernel
1181         check() { false; }
1182         . $_moddir/module-setup.sh
1183         moddir=$_moddir check 0
1184         _ret=$?
1185         unset check depends cmdline install installkernel
1186     fi
1187     unset mount_needs
1188     return $_ret
1189 }
1190
1191 # module_depends <dracut module>
1192 # execute the depends() function of module-setup.sh of <dracut module>
1193 # or the "depends" script, if module-setup.sh is not found
1194 module_depends() {
1195     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1196     local _ret
1197     [[ -d $_moddir ]] || return 1
1198     if [[ ! -f $_moddir/module-setup.sh ]]; then
1199         # if we do not have a check script, we have no deps
1200         [[ -x $_moddir/check ]] || return 0
1201         $_moddir/check -d
1202         return $?
1203     else
1204         unset check depends cmdline install installkernel
1205         depends() { true; }
1206         . $_moddir/module-setup.sh
1207         moddir=$_moddir depends
1208         _ret=$?
1209         unset check depends cmdline install installkernel
1210         return $_ret
1211     fi
1212 }
1213
1214 # module_cmdline <dracut module>
1215 # execute the cmdline() function of module-setup.sh of <dracut module>
1216 # or the "cmdline" script, if module-setup.sh is not found
1217 module_cmdline() {
1218     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1219     local _ret
1220     [[ -d $_moddir ]] || return 1
1221     if [[ ! -f $_moddir/module-setup.sh ]]; then
1222         [[ -x $_moddir/cmdline ]] && . "$_moddir/cmdline"
1223         return $?
1224     else
1225         unset check depends cmdline install installkernel
1226         cmdline() { true; }
1227         . $_moddir/module-setup.sh
1228         moddir=$_moddir cmdline
1229         _ret=$?
1230         unset check depends cmdline install installkernel
1231         return $_ret
1232     fi
1233 }
1234
1235 # module_install <dracut module>
1236 # execute the install() function of module-setup.sh of <dracut module>
1237 # or the "install" script, if module-setup.sh is not found
1238 module_install() {
1239     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1240     local _ret
1241     [[ -d $_moddir ]] || return 1
1242     if [[ ! -f $_moddir/module-setup.sh ]]; then
1243         [[ -x $_moddir/install ]] && . "$_moddir/install"
1244         return $?
1245     else
1246         unset check depends cmdline install installkernel
1247         install() { true; }
1248         . $_moddir/module-setup.sh
1249         moddir=$_moddir install
1250         _ret=$?
1251         unset check depends cmdline install installkernel
1252         return $_ret
1253     fi
1254 }
1255
1256 # module_installkernel <dracut module>
1257 # execute the installkernel() function of module-setup.sh of <dracut module>
1258 # or the "installkernel" script, if module-setup.sh is not found
1259 module_installkernel() {
1260     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1261     local _ret
1262     [[ -d $_moddir ]] || return 1
1263     if [[ ! -f $_moddir/module-setup.sh ]]; then
1264         [[ -x $_moddir/installkernel ]] && . "$_moddir/installkernel"
1265         return $?
1266     else
1267         unset check depends cmdline install installkernel
1268         installkernel() { true; }
1269         . $_moddir/module-setup.sh
1270         moddir=$_moddir installkernel
1271         _ret=$?
1272         unset check depends cmdline install installkernel
1273         return $_ret
1274     fi
1275 }
1276
1277 # check_mount <dracut module>
1278 # check_mount checks, if a dracut module is needed for the given
1279 # device and filesystem types in "${host_fs_types[@]}"
1280 check_mount() {
1281     local _mod=$1
1282     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1283     local _ret
1284     local _moddep
1285
1286     [ "${#host_fs_types[*]}" -le 0 ] && return 1
1287
1288     # If we are already scheduled to be loaded, no need to check again.
1289     [[ " $mods_to_load " == *\ $_mod\ * ]] && return 0
1290     [[ " $mods_checked_as_dep " == *\ $_mod\ * ]] && return 1
1291
1292     # This should never happen, but...
1293     [[ -d $_moddir ]] || return 1
1294
1295     [[ $2 ]] || mods_checked_as_dep+=" $_mod "
1296
1297     if [[ " $omit_dracutmodules " == *\ $_mod\ * ]]; then
1298         return 1
1299     fi
1300
1301     if [[ " $dracutmodules $add_dracutmodules $force_add_dracutmodules" == *\ $_mod\ * ]]; then
1302         module_check_mount $_mod; ret=$?
1303
1304         # explicit module, so also accept ret=255
1305         [[ $ret = 0 || $ret = 255 ]] || return 1
1306     else
1307         # module not in our list
1308         if [[ $dracutmodules = all ]]; then
1309             # check, if we can and should install this module
1310             module_check_mount $_mod || return 1
1311         else
1312             # skip this module
1313             return 1
1314         fi
1315     fi
1316
1317     for _moddep in $(module_depends $_mod); do
1318         # handle deps as if they were manually added
1319         [[ " $dracutmodules " == *\ $_mod\ * ]] \
1320             && [[ " $dracutmodules " != *\ $_moddep\ * ]] \
1321             && dracutmodules+=" $_moddep "
1322         [[ " $add_dracutmodules " == *\ $_mod\ * ]] \
1323             && [[ " $add_dracutmodules " != *\ $_moddep\ * ]] \
1324             && add_dracutmodules+=" $_moddep "
1325         [[ " $force_add_dracutmodules " == *\ $_mod\ * ]] \
1326             && [[ " $force_add_dracutmodules " != *\ $_moddep\ * ]] \
1327             && force_add_dracutmodules+=" $_moddep "
1328         # if a module we depend on fail, fail also
1329         if ! check_module $_moddep; then
1330             derror "dracut module '$_mod' depends on '$_moddep', which can't be installed"
1331             return 1
1332         fi
1333     done
1334
1335     [[ " $mods_to_load " == *\ $_mod\ * ]] || \
1336         mods_to_load+=" $_mod "
1337
1338     return 0
1339 }
1340
1341 # check_module <dracut module> [<use_as_dep>]
1342 # check if a dracut module is to be used in the initramfs process
1343 # if <use_as_dep> is set, then the process also keeps track
1344 # that the modules were checked for the dependency tracking process
1345 check_module() {
1346     local _mod=$1
1347     local _moddir=$(echo ${dracutbasedir}/modules.d/??${1})
1348     local _ret
1349     local _moddep
1350     # If we are already scheduled to be loaded, no need to check again.
1351     [[ " $mods_to_load " == *\ $_mod\ * ]] && return 0
1352     [[ " $mods_checked_as_dep " == *\ $_mod\ * ]] && return 1
1353
1354     # This should never happen, but...
1355     [[ -d $_moddir ]] || return 1
1356
1357     [[ $2 ]] || mods_checked_as_dep+=" $_mod "
1358
1359     if [[ " $omit_dracutmodules " == *\ $_mod\ * ]]; then
1360         dinfo "dracut module '$_mod' will not be installed, because it's in the list to be omitted!"
1361         return 1
1362     fi
1363
1364     if [[ " $dracutmodules $add_dracutmodules $force_add_dracutmodules" == *\ $_mod\ * ]]; then
1365         if [[ " $dracutmodules $force_add_dracutmodules " == *\ $_mod\ * ]]; then
1366             module_check $_mod 1; ret=$?
1367         else
1368             module_check $_mod 0; ret=$?
1369         fi
1370         # explicit module, so also accept ret=255
1371         [[ $ret = 0 || $ret = 255 ]] || return 1
1372     else
1373         # module not in our list
1374         if [[ $dracutmodules = all ]]; then
1375             # check, if we can and should install this module
1376             module_check $_mod; ret=$?
1377             if [[ $ret != 0 ]]; then
1378                 [[ $2 ]] && return 1
1379                 [[ $ret != 255 ]] && return 1
1380             fi
1381         else
1382             # skip this module
1383             return 1
1384         fi
1385     fi
1386
1387     for _moddep in $(module_depends $_mod); do
1388         # handle deps as if they were manually added
1389         [[ " $dracutmodules " == *\ $_mod\ * ]] \
1390             && [[ " $dracutmodules " != *\ $_moddep\ * ]] \
1391             && dracutmodules+=" $_moddep "
1392         [[ " $add_dracutmodules " == *\ $_mod\ * ]] \
1393             && [[ " $add_dracutmodules " != *\ $_moddep\ * ]] \
1394             && add_dracutmodules+=" $_moddep "
1395         [[ " $force_add_dracutmodules " == *\ $_mod\ * ]] \
1396             && [[ " $force_add_dracutmodules " != *\ $_moddep\ * ]] \
1397             && force_add_dracutmodules+=" $_moddep "
1398         # if a module we depend on fail, fail also
1399         if ! check_module $_moddep; then
1400             derror "dracut module '$_mod' depends on '$_moddep', which can't be installed"
1401             return 1
1402         fi
1403     done
1404
1405     [[ " $mods_to_load " == *\ $_mod\ * ]] || \
1406         mods_to_load+=" $_mod "
1407
1408     return 0
1409 }
1410
1411 # for_each_module_dir <func>
1412 # execute "<func> <dracut module> 1"
1413 for_each_module_dir() {
1414     local _modcheck
1415     local _mod
1416     local _moddir
1417     local _func
1418     _func=$1
1419     for _moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
1420         [[ -d $_moddir ]] || continue;
1421         [[ -e $_moddir/install || -e $_moddir/installkernel || \
1422             -e $_moddir/module-setup.sh ]] || continue
1423         _mod=${_moddir##*/}; _mod=${_mod#[0-9][0-9]}
1424         $_func $_mod 1
1425     done
1426
1427     # Report any missing dracut modules, the user has specified
1428     _modcheck="$add_dracutmodules $force_add_dracutmodules"
1429     [[ $dracutmodules != all ]] && _modcheck="$_modcheck $dracutmodules"
1430     for _mod in $_modcheck; do
1431         [[ " $mods_to_load " == *\ $_mod\ * ]] && continue
1432
1433         [[ " $force_add_dracutmodules " != *\ $_mod\ * ]] \
1434             && [[ " $dracutmodules " != *\ $_mod\ * ]] \
1435             && [[ " $omit_dracutmodules " == *\ $_mod\ * ]] \
1436             && continue
1437
1438         derror "dracut module '$_mod' cannot be found or installed."
1439         [[ " $force_add_dracutmodules " == *\ $_mod\ * ]] && exit 1
1440         [[ " $dracutmodules " == *\ $_mod\ * ]] && exit 1
1441         [[ " $add_dracutmodules " == *\ $_mod\ * ]] && exit 1
1442     done
1443 }
1444
1445 # Install a single kernel module along with any firmware it may require.
1446 # $1 = full path to kernel module to install
1447 install_kmod_with_fw() {
1448     # no need to go further if the module is already installed
1449
1450     [[ -e "${initdir}/lib/modules/$kernel/${1##*/lib/modules/$kernel/}" ]] \
1451         && return 0
1452
1453     if [[ $DRACUT_KERNEL_LAZY_HASHDIR ]] && [[ -e "$DRACUT_KERNEL_LAZY_HASHDIR/${1##*/}" ]]; then
1454         read ret < "$DRACUT_KERNEL_LAZY_HASHDIR/${1##*/}"
1455         return $ret
1456     fi
1457
1458     if [[ $omit_drivers ]]; then
1459         local _kmod=${1##*/}
1460         _kmod=${_kmod%.ko}
1461         _kmod=${_kmod/-/_}
1462         if [[ "$_kmod" =~ $omit_drivers ]]; then
1463             dinfo "Omitting driver $_kmod"
1464             return 0
1465         fi
1466         if [[ "${1##*/lib/modules/$kernel/}" =~ $omit_drivers ]]; then
1467             dinfo "Omitting driver $_kmod"
1468             return 0
1469         fi
1470     fi
1471
1472     if [[ $silent_omit_drivers ]]; then
1473         local _kmod=${1##*/}
1474         _kmod=${_kmod%.ko}
1475         _kmod=${_kmod/-/_}
1476         [[ "$_kmod" =~ $silent_omit_drivers ]] && return 0
1477         [[ "${1##*/lib/modules/$kernel/}" =~ $silent_omit_drivers ]] && return 0
1478     fi
1479
1480     inst_simple "$1" "/lib/modules/$kernel/${1##*/lib/modules/$kernel/}"
1481     ret=$?
1482     [[ $DRACUT_KERNEL_LAZY_HASHDIR ]] && \
1483         [[ -d "$DRACUT_KERNEL_LAZY_HASHDIR" ]] && \
1484         echo $ret > "$DRACUT_KERNEL_LAZY_HASHDIR/${1##*/}"
1485     (($ret != 0)) && return $ret
1486
1487     local _modname=${1##*/} _fwdir _found _fw
1488     _modname=${_modname%.ko*}
1489     for _fw in $(modinfo -k $kernel -F firmware $1 2>/dev/null); do
1490         _found=''
1491         for _fwdir in $fw_dir; do
1492             if [[ -d $_fwdir && -f $_fwdir/$_fw ]]; then
1493                 inst_simple "$_fwdir/$_fw" "/lib/firmware/$_fw"
1494                 _found=yes
1495             fi
1496         done
1497         if [[ $_found != yes ]]; then
1498             if ! [[ -d $(echo /sys/module/${_modname//-/_}|{ read a b; echo $a; }) ]]; then
1499                 dinfo "Possible missing firmware \"${_fw}\" for kernel module" \
1500                     "\"${_modname}.ko\""
1501             else
1502                 dwarn "Possible missing firmware \"${_fw}\" for kernel module" \
1503                     "\"${_modname}.ko\""
1504             fi
1505         fi
1506     done
1507     return 0
1508 }
1509
1510 # Do something with all the dependencies of a kernel module.
1511 # Note that kernel modules depend on themselves using the technique we use
1512 # $1 = function to call for each dependency we find
1513 #      It will be passed the full path to the found kernel module
1514 # $2 = module to get dependencies for
1515 # rest of args = arguments to modprobe
1516 # _fderr specifies FD passed from surrounding scope
1517 for_each_kmod_dep() {
1518     local _func=$1 _kmod=$2 _cmd _modpath _options
1519     shift 2
1520     modprobe "$@" --ignore-install --show-depends $_kmod 2>&${_fderr} | (
1521         while read _cmd _modpath _options; do
1522             [[ $_cmd = insmod ]] || continue
1523             $_func ${_modpath} || exit $?
1524         done
1525     )
1526 }
1527
1528 dracut_kernel_post() {
1529     local _moddirname=${srcmods%%/lib/modules/*}
1530     local _pid
1531
1532     if [[ $DRACUT_KERNEL_LAZY_HASHDIR ]] && [[ -f "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist" ]]; then
1533         xargs -r modprobe -a ${_moddirname:+-d ${_moddirname}/} \
1534             --ignore-install --show-depends --set-version $kernel \
1535             < "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist" 2>/dev/null \
1536             | sort -u \
1537             | while read _cmd _modpath _options; do
1538             [[ $_cmd = insmod ]] || continue
1539             echo "$_modpath"
1540         done > "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist.dep"
1541
1542         (
1543             if [[ $DRACUT_INSTALL ]] && [[ -z $_moddirname ]]; then
1544                 xargs -r $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} -a < "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist.dep"
1545             else
1546                 while read _modpath; do
1547                     local _destpath=$_modpath
1548                     [[ $_moddirname ]] && _destpath=${_destpath##$_moddirname/}
1549                     _destpath=${_destpath##*/lib/modules/$kernel/}
1550                     inst_simple "$_modpath" "/lib/modules/$kernel/${_destpath}" || exit $?
1551                 done < "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist.dep"
1552             fi
1553         ) &
1554         _pid=$(jobs -p | while read a ; do printf ":$a";done)
1555         _pid=${_pid##*:}
1556
1557         if [[ $DRACUT_INSTALL ]]; then
1558             xargs -r modinfo -k $kernel -F firmware < "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist.dep" \
1559                 | while read line; do
1560                 for _fwdir in $fw_dir; do
1561                     echo $_fwdir/$line;
1562                 done;
1563             done | xargs -r $DRACUT_INSTALL ${initdir:+-D "$initdir"} ${loginstall:+-L "$loginstall"} -a -o
1564         else
1565             for _fw in $(xargs -r modinfo -k $kernel -F firmware < "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist.dep"); do
1566                 for _fwdir in $fw_dir; do
1567                     if [[ -d $_fwdir && -f $_fwdir/$_fw ]]; then
1568                         inst_simple "$_fwdir/$_fw" "/lib/firmware/$_fw"
1569                         break
1570                     fi
1571                 done
1572             done
1573         fi
1574
1575         wait $_pid
1576     fi
1577
1578     for _f in modules.builtin.bin modules.builtin modules.order; do
1579         [[ $srcmods/$_f ]] && inst_simple "$srcmods/$_f" "/lib/modules/$kernel/$_f"
1580     done
1581
1582     # generate module dependencies for the initrd
1583     if [[ -d $initdir/lib/modules/$kernel ]] && \
1584         ! depmod -a -b "$initdir" $kernel; then
1585         dfatal "\"depmod -a $kernel\" failed."
1586         exit 1
1587     fi
1588
1589     [[ $DRACUT_KERNEL_LAZY_HASHDIR ]] && rm -fr -- "$DRACUT_KERNEL_LAZY_HASHDIR"
1590 }
1591
1592 [[ "$kernel_current" ]] || export kernel_current=$(uname -r)
1593
1594 module_is_host_only() {
1595     local _mod=$1
1596     local _modenc a i _k _s _v _aliases
1597     _mod=${_mod##*/}
1598     _mod=${_mod%.ko}
1599     _modenc=${_mod//-/_}
1600
1601     [[ " $add_drivers " == *\ ${_mod}\ * ]] && return 0
1602
1603     # check if module is loaded
1604     [[ ${host_modules["$_modenc"]} ]] && return 0
1605
1606     [[ "$kernel_current" ]] || export kernel_current=$(uname -r)
1607
1608     if [[ "$kernel_current" != "$kernel" ]]; then
1609         # check if module is loadable on the current kernel
1610         # this covers the case, where a new module is introduced
1611         # or a module was renamed
1612         # or a module changed from builtin to a module
1613
1614         if [[ -d /lib/modules/$kernel_current ]]; then
1615             # if the modinfo can be parsed, but the module
1616             # is not loaded, then we can safely return 1
1617             modinfo -F filename "$_mod" &>/dev/null && return 1
1618         fi
1619
1620         _aliases=$(modinfo -k $kernel -F alias $_mod 2>/dev/null)
1621
1622         # if the module has no aliases, install it
1623         [[ $_aliases ]] || return 0
1624
1625         # finally check all modalias
1626         for a in $_aliases; do
1627             for i in "${!host_modalias[@]}"; do
1628                 [[ $i == $a ]]  && return 0
1629             done
1630         done
1631
1632     fi
1633
1634     return 1
1635 }
1636
1637 find_kernel_modules_by_path () {
1638     local _OLDIFS
1639
1640     [[ -f "$srcmods/modules.dep" ]] || return 0
1641
1642     _OLDIFS=$IFS
1643     IFS=:
1644     while read a rest; do
1645         [[ $a = */$1/* ]] || [[ $a = updates/* ]] || continue
1646         printf "%s\n" "$srcmods/$a"
1647     done < "$srcmods/modules.dep"
1648     IFS=$_OLDIFS
1649     return 0
1650 }
1651
1652 find_kernel_modules () {
1653     find_kernel_modules_by_path  drivers
1654 }
1655
1656 # instmods [-c [-s]] <kernel module> [<kernel module> ... ]
1657 # instmods [-c [-s]] <kernel subsystem>
1658 # install kernel modules along with all their dependencies.
1659 # <kernel subsystem> can be e.g. "=block" or "=drivers/usb/storage"
1660 instmods() {
1661     [[ $no_kernel = yes ]] && return
1662     # called [sub]functions inherit _fderr
1663     local _fderr=9
1664     local _check=no
1665     local _silent=no
1666     if [[ $1 = '-c' ]]; then
1667         _check=yes
1668         shift
1669     fi
1670
1671     if [[ $1 = '-s' ]]; then
1672         _silent=yes
1673         shift
1674     fi
1675
1676     function inst1mod() {
1677         local _ret=0 _mod="$1"
1678         case $_mod in
1679             =*)
1680                 ( [[ "$_mpargs" ]] && echo $_mpargs
1681                     find_kernel_modules_by_path "${_mod#=}" ) \
1682                         | instmods
1683                 ((_ret+=$?))
1684                 ;;
1685             --*) _mpargs+=" $_mod" ;;
1686             *)
1687                 _mod=${_mod##*/}
1688                 # if we are already installed, skip this module and go on
1689                 # to the next one.
1690                 if [[ $DRACUT_KERNEL_LAZY_HASHDIR ]] && \
1691                     [[ -f "$DRACUT_KERNEL_LAZY_HASHDIR/${_mod%.ko}.ko" ]]; then
1692                     read _ret <"$DRACUT_KERNEL_LAZY_HASHDIR/${_mod%.ko}.ko"
1693                     return $_ret
1694                 fi
1695
1696                 _mod=${_mod/-/_}
1697                 if [[ $omit_drivers ]] && [[ "$_mod" =~ $omit_drivers ]]; then
1698                     dinfo "Omitting driver ${_mod##$srcmods}"
1699                     return 0
1700                 fi
1701
1702                 # If we are building a host-specific initramfs and this
1703                 # module is not already loaded, move on to the next one.
1704                 [[ $hostonly ]] \
1705                     && ! module_is_host_only "$_mod" \
1706                     && return 0
1707
1708                 if [[ "$_check" = "yes" ]] || ! [[ $DRACUT_KERNEL_LAZY_HASHDIR ]]; then
1709                     # We use '-d' option in modprobe only if modules prefix path
1710                     # differs from default '/'.  This allows us to use dracut with
1711                     # old version of modprobe which doesn't have '-d' option.
1712                     local _moddirname=${srcmods%%/lib/modules/*}
1713                     [[ -n ${_moddirname} ]] && _moddirname="-d ${_moddirname}/"
1714
1715                     # ok, load the module, all its dependencies, and any firmware
1716                     # it may require
1717                     for_each_kmod_dep install_kmod_with_fw $_mod \
1718                         --set-version $kernel ${_moddirname} $_mpargs
1719                     ((_ret+=$?))
1720                 else
1721                     [[ $DRACUT_KERNEL_LAZY_HASHDIR ]] && \
1722                         echo $_mod >> "$DRACUT_KERNEL_LAZY_HASHDIR/lazylist"
1723                 fi
1724                 ;;
1725         esac
1726         return $_ret
1727     }
1728
1729     function instmods_1() {
1730         local _mod _mpargs
1731         if (($# == 0)); then  # filenames from stdin
1732             while read _mod; do
1733                 inst1mod "${_mod%.ko*}" || {
1734                     if [[ "$_check" == "yes" ]]; then
1735                         [[ "$_silent" == "no" ]] && dfatal "Failed to install module $_mod"
1736                         return 1
1737                     fi
1738                 }
1739             done
1740         fi
1741         while (($# > 0)); do  # filenames as arguments
1742             inst1mod ${1%.ko*} || {
1743                 if [[ "$_check" == "yes" ]]; then
1744                     [[ "$_silent" == "no" ]] && dfatal "Failed to install module $1"
1745                     return 1
1746                 fi
1747             }
1748             shift
1749         done
1750         return 0
1751     }
1752
1753     local _ret _filter_not_found='FATAL: Module .* not found.'
1754     # Capture all stderr from modprobe to _fderr. We could use {var}>...
1755     # redirections, but that would make dracut require bash4 at least.
1756     eval "( instmods_1 \"\$@\" ) ${_fderr}>&1" \
1757         | while read line; do [[ "$line" =~ $_filter_not_found ]] || echo $line;done | derror
1758     _ret=$?
1759     return $_ret
1760 }
1761
1762 check_kernel_config()
1763 {
1764     local _config_opt="$1"
1765     local _config_file
1766     [[ -f /boot/config-$kernel ]] \
1767         && _config_file="/boot/config-$kernel"
1768     [[ -f /lib/modules/$kernel/config ]] \
1769         && _config_file="/lib/modules/$kernel/config"
1770
1771     # no kernel config file, so return true
1772     [[ $_config_file ]] || return 0
1773
1774     grep -q -F "${_config_opt}=" "$_config_file" && return 0
1775     return 1
1776 }
1777
1778
1779 # get_cpu_vendor
1780 # Only two values are returned: AMD or Intel
1781 get_cpu_vendor ()
1782 {
1783     if grep -qE AMD /proc/cpuinfo; then
1784         printf "AMD"
1785     fi
1786     if grep -qE Intel /proc/cpuinfo; then
1787         printf "Intel"
1788     fi
1789 }
1790
1791 # get_host_ucode
1792 # Get the hosts' ucode file based on the /proc/cpuinfo
1793 get_ucode_file ()
1794 {
1795     local family=`grep -E "cpu family" /proc/cpuinfo | head -1 | sed s/.*:\ //`
1796     local model=`grep -E "model" /proc/cpuinfo |grep -v name | head -1 | sed s/.*:\ //`
1797     local stepping=`grep -E "stepping" /proc/cpuinfo | head -1 | sed s/.*:\ //`
1798
1799     if [[ "$(get_cpu_vendor)" == "AMD" ]]; then
1800         # If family greater or equal than 0x15
1801         if [[ $family -ge 21 ]]; then
1802             printf "microcode_amd_fam15h.bin"
1803         else
1804             printf "microcode_amd.bin"
1805         fi
1806     fi
1807     if [[ "$(get_cpu_vendor)" == "Intel" ]]; then
1808         # The /proc/cpuinfo are in decimal.
1809         printf "%02x-%02x-%02x" ${family} ${model} ${stepping}
1810     fi
1811 }
1812
1813 # Not every device in /dev/mapper should be examined.
1814 # If it is an LVM device, touch only devices which have /dev/VG/LV symlink.
1815 lvm_internal_dev() {
1816     local dev_dm_dir=/sys/dev/block/$1/dm
1817     [[ ! -f $dev_dm_dir/uuid || $(<$dev_dm_dir/uuid) != LVM-* ]] && return 1 # Not an LVM device
1818     local DM_VG_NAME DM_LV_NAME DM_LV_LAYER
1819     eval $(dmsetup splitname --nameprefixes --noheadings --rows "$(<$dev_dm_dir/name)" 2>/dev/null)
1820     [[ ${DM_VG_NAME} ]] && [[ ${DM_LV_NAME} ]] || return 0 # Better skip this!
1821     [[ ${DM_LV_LAYER} ]] || [[ ! -L /dev/${DM_VG_NAME}/${DM_LV_NAME} ]]
1822 }
1823