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     local _out
 238
 239     if [[ $get_maj_min_cache_file ]]; then
 240         _out="$(grep -m1 -oP "^$1 \K\S+$" "$get_maj_min_cache_file")"
 241     fi
 242
 243     if ! [[ "$_out" ]]; then
 244         _majmin="$(stat -L -c '%t:%T' "$1" 2> /dev/null)"
 245         _out="$(printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))")"
 246         if [[ $get_maj_min_cache_file ]]; then
 247             echo "$1 $_out" >> "$get_maj_min_cache_file"
 248         fi
 249     fi
 250     echo -n "$_out"
 251 }
 252
 253 # get_devpath_block <device>
 254 # get the DEVPATH in /sys of a block device
 255 get_devpath_block() {
 256     local _majmin _i
 257     _majmin=$(get_maj_min "$1")
 258
 259     for _i in /sys/block/*/dev /sys/block/*/*/dev; do
 260         [[ -e $_i ]] || continue
 261         if [[ $_majmin == "$(< "$_i")" ]]; then
 262             printf "%s" "${_i%/dev}"
 263             return 0
 264         fi
 265     done
 266     return 1
 267 }
 268
 269 # get a persistent path from a device
 270 get_persistent_dev() {
 271     local i _tmp _dev _pol
 272
 273     _dev=$(get_maj_min "$1")
 274     [ -z "$_dev" ] && return
 275
 276     if [[ -n $persistent_policy ]]; then
 277         _pol="/dev/disk/${persistent_policy}/*"
 278     else
 279         _pol=
 280     fi
 281
 282     for i in \
 283         $_pol \
 284         /dev/mapper/* \
 285         /dev/disk/by-uuid/* \
 286         /dev/disk/by-label/* \
 287         /dev/disk/by-partuuid/* \
 288         /dev/disk/by-partlabel/* \
 289         /dev/disk/by-id/* \
 290         /dev/disk/by-path/*; do
 291         [[ -e $i ]] || continue
 292         [[ $i == /dev/mapper/control ]] && continue
 293         [[ $i == /dev/mapper/mpath* ]] && continue
 294         _tmp=$(get_maj_min "$i")
 295         if [ "$_tmp" = "$_dev" ]; then
 296             printf -- "%s" "$i"
 297             return
 298         fi
 299     done
 300     printf -- "%s" "$1"
 301 }
 302
 303 expand_persistent_dev() {
 304     local _dev=$1
 305
 306     case "$_dev" in
 307         LABEL=*)
 308             _dev="/dev/disk/by-label/${_dev#LABEL=}"
 309             ;;
 310         UUID=*)
 311             _dev="${_dev#UUID=}"
 312             _dev="${_dev,,}"
 313             _dev="/dev/disk/by-uuid/${_dev}"
 314             ;;
 315         PARTUUID=*)
 316             _dev="${_dev#PARTUUID=}"
 317             _dev="${_dev,,}"
 318             _dev="/dev/disk/by-partuuid/${_dev}"
 319             ;;
 320         PARTLABEL=*)
 321             _dev="/dev/disk/by-partlabel/${_dev#PARTLABEL=}"
 322             ;;
 323     esac
 324     printf "%s" "$_dev"
 325 }
 326
 327 shorten_persistent_dev() {
 328     local _dev="$1"
 329     case "$_dev" in
 330         /dev/disk/by-uuid/*)
 331             printf "%s" "UUID=${_dev##*/}"
 332             ;;
 333         /dev/disk/by-label/*)
 334             printf "%s" "LABEL=${_dev##*/}"
 335             ;;
 336         /dev/disk/by-partuuid/*)
 337             printf "%s" "PARTUUID=${_dev##*/}"
 338             ;;
 339         /dev/disk/by-partlabel/*)
 340             printf "%s" "PARTLABEL=${_dev##*/}"
 341             ;;
 342         *)
 343             printf "%s" "$_dev"
 344             ;;
 345     esac
 346 }
 347
 348 # find_block_device <mountpoint>
 349 # Prints the major and minor number of the block device
 350 # for a given mountpoint.
 351 # Unless $use_fstab is set to "yes" the functions
 352 # uses /proc/self/mountinfo as the primary source of the
 353 # information and only falls back to /etc/fstab, if the mountpoint
 354 # is not found there.
 355 # Example:
 356 # $ find_block_device /usr
 357 # 8:4
 358 find_block_device() {
 359     local _dev _majmin _find_mpt
 360     _find_mpt="$1"
 361
 362     if [[ $use_fstab != yes ]]; then
 363         [[ -d $_find_mpt/. ]]
 364         findmnt -e -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | {
 365             while read -r _majmin _dev || [ -n "$_dev" ]; do
 366                 if [[ -b $_dev ]]; then
 367                     if ! [[ $_majmin ]] || [[ $_majmin == 0:* ]]; then
 368                         _majmin=$(get_maj_min "$_dev")
 369                     fi
 370                     if [[ $_majmin ]]; then
 371                         printf "%s\n" "$_majmin"
 372                     else
 373                         printf "%s\n" "$_dev"
 374                     fi
 375                     return 0
 376                 fi
 377                 if [[ $_dev == *:* ]]; then
 378                     printf "%s\n" "$_dev"
 379                     return 0
 380                 fi
 381             done
 382             return 1
 383         } && return 0
 384     fi
 385     # fall back to /etc/fstab
 386
 387     findmnt -e --fstab -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | {
 388         while read -r _majmin _dev || [ -n "$_dev" ]; do
 389             if ! [[ $_dev ]]; then
 390                 _dev="$_majmin"
 391                 unset _majmin
 392             fi
 393             if [[ -b $_dev ]]; then
 394                 [[ $_majmin ]] || _majmin=$(get_maj_min "$_dev")
 395                 if [[ $_majmin ]]; then
 396                     printf "%s\n" "$_majmin"
 397                 else
 398                     printf "%s\n" "$_dev"
 399                 fi
 400                 return 0
 401             fi
 402             if [[ $_dev == *:* ]]; then
 403                 printf "%s\n" "$_dev"
 404                 return 0
 405             fi
 406         done
 407         return 1
 408     } && return 0
 409
 410     return 1
 411 }
 412
 413 # find_mp_fstype <mountpoint>
 414 # Echo the filesystem type for a given mountpoint.
 415 # /proc/self/mountinfo is taken as the primary source of information
 416 # and /etc/fstab is used as a fallback.
 417 # No newline is appended!
 418 # Example:
 419 # $ find_mp_fstype /;echo
 420 # ext4
 421 find_mp_fstype() {
 422     local _fs
 423
 424     if [[ $use_fstab != yes ]]; then
 425         findmnt -e -v -n -o 'FSTYPE' --target "$1" | {
 426             while read -r _fs || [ -n "$_fs" ]; do
 427                 [[ $_fs ]] || continue
 428                 [[ $_fs == "autofs" ]] && continue
 429                 printf "%s" "$_fs"
 430                 return 0
 431             done
 432             return 1
 433         } && return 0
 434     fi
 435
 436     findmnt --fstab -e -v -n -o 'FSTYPE' --target "$1" | {
 437         while read -r _fs || [ -n "$_fs" ]; do
 438             [[ $_fs ]] || continue
 439             [[ $_fs == "autofs" ]] && continue
 440             printf "%s" "$_fs"
 441             return 0
 442         done
 443         return 1
 444     } && return 0
 445
 446     return 1
 447 }
 448
 449 # find_dev_fstype <device>
 450 # Echo the filesystem type for a given device.
 451 # /proc/self/mountinfo is taken as the primary source of information
 452 # and /etc/fstab is used as a fallback.
 453 # No newline is appended!
 454 # Example:
 455 # $ find_dev_fstype /dev/sda2;echo
 456 # ext4
 457 find_dev_fstype() {
 458     local _find_dev _fs
 459     _find_dev="$1"
 460     if ! [[ $_find_dev == /dev* ]]; then
 461         [[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
 462     fi
 463
 464     if [[ $use_fstab != yes ]]; then
 465         findmnt -e -v -n -o 'FSTYPE' --source "$_find_dev" | {
 466             while read -r _fs || [ -n "$_fs" ]; do
 467                 [[ $_fs ]] || continue
 468                 [[ $_fs == "autofs" ]] && continue
 469                 printf "%s" "$_fs"
 470                 return 0
 471             done
 472             return 1
 473         } && return 0
 474     fi
 475
 476     findmnt --fstab -e -v -n -o 'FSTYPE' --source "$_find_dev" | {
 477         while read -r _fs || [ -n "$_fs" ]; do
 478             [[ $_fs ]] || continue
 479             [[ $_fs == "autofs" ]] && continue
 480             printf "%s" "$_fs"
 481             return 0
 482         done
 483         return 1
 484     } && return 0
 485
 486     return 1
 487 }
 488
 489 # find_mp_fsopts <mountpoint>
 490 # Echo the filesystem options for a given mountpoint.
 491 # /proc/self/mountinfo is taken as the primary source of information
 492 # and /etc/fstab is used as a fallback.
 493 # No newline is appended!
 494 # Example:
 495 # $ find_mp_fsopts /;echo
 496 # rw,relatime,discard,data=ordered
 497 find_mp_fsopts() {
 498     if [[ $use_fstab != yes ]]; then
 499         findmnt -e -v -n -o 'OPTIONS' --target "$1" 2> /dev/null && return 0
 500     fi
 501
 502     findmnt --fstab -e -v -n -o 'OPTIONS' --target "$1"
 503 }
 504
 505 # find_dev_fsopts <device>
 506 # Echo the filesystem options for a given device.
 507 # /proc/self/mountinfo is taken as the primary source of information
 508 # and /etc/fstab is used as a fallback.
 509 # if `use_fstab == yes`, then only `/etc/fstab` is used.
 510 #
 511 # Example:
 512 # $ find_dev_fsopts /dev/sda2
 513 # rw,relatime,discard,data=ordered
 514 find_dev_fsopts() {
 515     local _find_dev
 516     _find_dev="$1"
 517     if ! [[ $_find_dev == /dev* ]]; then
 518         [[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
 519     fi
 520
 521     if [[ $use_fstab != yes ]]; then
 522         findmnt -e -v -n -o 'OPTIONS' --source "$_find_dev" 2> /dev/null && return 0
 523     fi
 524
 525     findmnt --fstab -e -v -n -o 'OPTIONS' --source "$_find_dev"
 526 }
 527
 528 # finds the major:minor of the block device backing the root filesystem.
 529 find_root_block_device() { find_block_device /; }
 530
 531 # for_each_host_dev_fs <func>
 532 # Execute "<func> <dev> <filesystem>" for every "<dev> <fs>" pair found
 533 # in ${host_fs_types[@]}
 534 for_each_host_dev_fs() {
 535     local _func="$1"
 536     local _dev
 537     local _ret=1
 538
 539     [[ "${#host_fs_types[@]}" ]] || return 2
 540
 541     for _dev in "${!host_fs_types[@]}"; do
 542         $_func "$_dev" "${host_fs_types[$_dev]}" && _ret=0
 543     done
 544     return $_ret
 545 }
 546
 547 host_fs_all() {
 548     printf "%s\n" "${host_fs_types[@]}"
 549 }
 550
 551 # Walk all the slave relationships for a given block device.
 552 # Stop when our helper function returns success
 553 # $1 = function to call on every found block device
 554 # $2 = block device in major:minor format
 555 check_block_and_slaves() {
 556     local _x
 557     [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
 558     if ! lvm_internal_dev "$2"; then "$1" "$2" && return; fi
 559     check_vol_slaves "$@" && return 0
 560     if [[ -f /sys/dev/block/$2/../dev ]] && [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
 561         check_block_and_slaves "$1" "$(< "/sys/dev/block/$2/../dev")" && return 0
 562     fi
 563     for _x in /sys/dev/block/"$2"/slaves/*; do
 564         [[ -f $_x/dev ]] || continue
 565         [[ $_x/subsystem -ef /sys/class/block ]] || continue
 566         check_block_and_slaves "$1" "$(< "$_x/dev")" && return 0
 567     done
 568     return 1
 569 }
 570
 571 check_block_and_slaves_all() {
 572     local _x _ret=1
 573     [[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
 574     if ! lvm_internal_dev "$2" && "$1" "$2"; then
 575         _ret=0
 576     fi
 577     check_vol_slaves_all "$@" && return 0
 578     if [[ -f /sys/dev/block/$2/../dev ]] && [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
 579         check_block_and_slaves_all "$1" "$(< "/sys/dev/block/$2/../dev")" && _ret=0
 580     fi
 581     for _x in /sys/dev/block/"$2"/slaves/*; do
 582         [[ -f $_x/dev ]] || continue
 583         [[ $_x/subsystem -ef /sys/class/block ]] || continue
 584         check_block_and_slaves_all "$1" "$(< "$_x/dev")" && _ret=0
 585     done
 586     return $_ret
 587 }
 588 # for_each_host_dev_and_slaves <func>
 589 # Execute "<func> <dev>" for every "<dev>" found
 590 # in ${host_devs[@]} and their slaves
 591 for_each_host_dev_and_slaves_all() {
 592     local _func="$1"
 593     local _dev
 594     local _ret=1
 595
 596     [[ "${host_devs[*]}" ]] || return 2
 597
 598     for _dev in "${host_devs[@]}"; do
 599         [[ -b $_dev ]] || continue
 600         if check_block_and_slaves_all "$_func" "$(get_maj_min "$_dev")"; then
 601             _ret=0
 602         fi
 603     done
 604     return $_ret
 605 }
 606
 607 for_each_host_dev_and_slaves() {
 608     local _func="$1"
 609     local _dev
 610
 611     [[ "${host_devs[*]}" ]] || return 2
 612
 613     for _dev in "${host_devs[@]}"; do
 614         [[ -b $_dev ]] || continue
 615         check_block_and_slaves "$_func" "$(get_maj_min "$_dev")" && return 0
 616     done
 617     return 1
 618 }
 619
 620 # /sys/dev/block/major:minor is symbol link to real hardware device
 621 # go downstream $(realpath /sys/dev/block/major:minor) to detect driver
 622 get_blockdev_drv_through_sys() {
 623     local _block_mods=""
 624     local _path
 625
 626     _path=$(realpath "$1")
 627     while true; do
 628         if [[ -L "$_path"/driver/module ]]; then
 629             _mod=$(realpath "$_path"/driver/module)
 630             _mod=$(basename "$_mod")
 631             _block_mods="$_block_mods $_mod"
 632         fi
 633         _path=$(dirname "$_path")
 634         if [[ $_path == '/sys/devices' ]] || [[ $_path == '/' ]]; then
 635             break
 636         fi
 637     done
 638     echo "$_block_mods"
 639 }
 640
 641 # ugly workaround for the lvm design
 642 # There is no volume group device,
 643 # so, there are no slave devices for volume groups.
 644 # Logical volumes only have the slave devices they really live on,
 645 # but you cannot create the logical volume without the volume group.
 646 # And the volume group might be bigger than the devices the LV needs.
 647 check_vol_slaves() {
 648     local _vg _pv _dm _majmin
 649     _majmin="$2"
 650     _dm=/sys/dev/block/$_majmin/dm
 651     [[ -f $_dm/uuid && $(< "$_dm"/uuid) =~ LVM-* ]] || return 1
 652     _vg=$(dmsetup splitname --noheadings -o vg_name "$(< "$_dm/name")")
 653     # strip space
 654     _vg="${_vg//[[:space:]]/}"
 655     if [[ $_vg ]]; then
 656         for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2> /dev/null); do
 657             check_block_and_slaves "$1" "$(get_maj_min "$_pv")" && return 0
 658         done
 659     fi
 660     return 1
 661 }
 662
 663 check_vol_slaves_all() {
 664     local _vg _pv _majmin
 665     _majmin="$2"
 666     _dm="/sys/dev/block/$_majmin/dm"
 667     [[ -f $_dm/uuid && $(< "$_dm"/uuid) =~ LVM-* ]] || return 1
 668     _vg=$(dmsetup splitname --noheadings -o vg_name "$(< "$_dm/name")")
 669     # strip space
 670     _vg="${_vg//[[:space:]]/}"
 671     if [[ $_vg ]]; then
 672         # when filter/global_filter is set, lvm may be failed
 673         if ! lvm lvs --noheadings -o vg_name "$_vg" 2> /dev/null 1> /dev/null; then
 674             return 1
 675         fi
 676
 677         for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2> /dev/null); do
 678             check_block_and_slaves_all "$1" "$(get_maj_min "$_pv")"
 679         done
 680         return 0
 681     fi
 682     return 1
 683 }
 684
 685 # fs_get_option <filesystem options> <search for option>
 686 # search for a specific option in a bunch of filesystem options
 687 # and return the value
 688 fs_get_option() {
 689     local _fsopts=$1
 690     local _option=$2
 691     local OLDIFS="$IFS"
 692     IFS=,
 693     # shellcheck disable=SC2086
 694     set -- $_fsopts
 695     IFS="$OLDIFS"
 696     while [ $# -gt 0 ]; do
 697         case $1 in
 698             $_option=*)
 699                 echo "${1#${_option}=}"
 700                 break
 701                 ;;
 702         esac
 703         shift
 704     done
 705 }
 706
 707 check_kernel_config() {
 708     local _config_opt="$1"
 709     local _config_file
 710     [[ -f $dracutsysrootdir/boot/config-$kernel ]] \
 711         && _config_file="/boot/config-$kernel"
 712     [[ -f $dracutsysrootdir/lib/modules/$kernel/config ]] \
 713         && _config_file="/lib/modules/$kernel/config"
 714
 715     # no kernel config file, so return true
 716     [[ $_config_file ]] || return 0
 717
 718     grep -q -F "${_config_opt}=" "$dracutsysrootdir$_config_file" && return 0
 719     return 1
 720 }
 721
 722 # 0 if the kernel module is either built-in or available
 723 # 1 if the kernel module is not enabled
 724 check_kernel_module() {
 725     modprobe -S "$kernel" --dry-run "$1" &> /dev/null || return 1
 726 }
 727
 728 # get_cpu_vendor
 729 # Only two values are returned: AMD or Intel
 730 get_cpu_vendor() {
 731     if grep -qE AMD /proc/cpuinfo; then
 732         printf "AMD"
 733     fi
 734     if grep -qE Intel /proc/cpuinfo; then
 735         printf "Intel"
 736     fi
 737 }
 738
 739 # get_host_ucode
 740 # Get the hosts' ucode file based on the /proc/cpuinfo
 741 get_ucode_file() {
 742     local family
 743     local model
 744     local stepping
 745     family=$(grep -E "cpu family" /proc/cpuinfo | head -1 | sed "s/.*:\ //")
 746     model=$(grep -E "model" /proc/cpuinfo | grep -v name | head -1 | sed "s/.*:\ //")
 747     stepping=$(grep -E "stepping" /proc/cpuinfo | head -1 | sed "s/.*:\ //")
 748
 749     if [[ "$(get_cpu_vendor)" == "AMD" ]]; then
 750         if [[ $family -ge 21 ]]; then
 751             printf "microcode_amd_fam%xh.bin" "$family"
 752         else
 753             printf "microcode_amd.bin"
 754         fi
 755     fi
 756     if [[ "$(get_cpu_vendor)" == "Intel" ]]; then
 757         # The /proc/cpuinfo are in decimal.
 758         printf "%02x-%02x-%02x" "${family}" "${model}" "${stepping}"
 759     fi
 760 }
 761
 762 # Not every device in /dev/mapper should be examined.
 763 # If it is an LVM device, touch only devices which have /dev/VG/LV symlink.
 764 lvm_internal_dev() {
 765     local dev_dm_dir=/sys/dev/block/$1/dm
 766     [[ ! -f $dev_dm_dir/uuid || $(< "$dev_dm_dir"/uuid) != LVM-* ]] && return 1 # Not an LVM device
 767     local DM_VG_NAME DM_LV_NAME DM_LV_LAYER
 768     eval "$(dmsetup splitname --nameprefixes --noheadings --rows "$(< "$dev_dm_dir"/name)" 2> /dev/null)"
 769     [[ ${DM_VG_NAME} ]] && [[ ${DM_LV_NAME} ]] || return 0 # Better skip this!
 770     [[ ${DM_LV_LAYER} ]] || [[ ! -L /dev/${DM_VG_NAME}/${DM_LV_NAME} ]]
 771 }
 772
 773 btrfs_devs() {
 774     local _mp="$1"
 775     btrfs device usage "$_mp" \
 776         | while read -r _dev _; do
 777             str_starts "$_dev" "/" || continue
 778             _dev=${_dev%,}
 779             printf -- "%s\n" "$_dev"
 780         done
 781 }
 782
 783 zfs_devs() {
 784     local _mp="$1"
 785     zpool list -H -v -P "${_mp%%/*}" | awk -F$'\t' '$2 ~ /^\// {print $2}' \
 786         | while read -r _dev; do
 787             realpath "${_dev}"
 788         done
 789 }
 790
 791 iface_for_remote_addr() {
 792     # shellcheck disable=SC2046
 793     set -- $(ip -o route get to "$1")
 794     while [ $# -gt 0 ]; do
 795         case $1 in
 796             dev)
 797                 echo "$2"
 798                 return
 799                 ;;
 800         esac
 801         shift
 802     done
 803 }
 804
 805 local_addr_for_remote_addr() {
 806     # shellcheck disable=SC2046
 807     set -- $(ip -o route get to "$1")
 808     while [ $# -gt 0 ]; do
 809         case $1 in
 810             src)
 811                 echo "$2"
 812                 return
 813                 ;;
 814         esac
 815         shift
 816     done
 817 }
 818
 819 peer_for_addr() {
 820     local addr=$1
 821     local qtd
 822
 823     # quote periods in IPv4 address
 824     qtd=${addr//./\\.}
 825     ip -o addr show \
 826         | sed -n 's%^.* '"$qtd"' peer \([0-9a-f.:]\{1,\}\(/[0-9]*\)\?\).*$%\1%p'
 827 }
 828
 829 netmask_for_addr() {
 830     local addr=$1
 831     local qtd
 832
 833     # quote periods in IPv4 address
 834     qtd=${addr//./\\.}
 835     ip -o addr show | sed -n 's,^.* '"$qtd"'/\([0-9]*\) .*$,\1,p'
 836 }
 837
 838 gateway_for_iface() {
 839     local ifname=$1 addr=$2
 840
 841     case $addr in
 842         *.*) proto=4 ;;
 843         *:*) proto=6 ;;
 844         *) return ;;
 845     esac
 846     ip -o -$proto route show \
 847         | sed -n "s/^default via \([0-9a-z.:]\{1,\}\) dev $ifname .*\$/\1/p"
 848 }
 849
 850 # This works only for ifcfg-style network configuration!
 851 bootproto_for_iface() {
 852     local ifname=$1
 853     local dir
 854
 855     # follow ifcfg settings for boot protocol
 856     for dir in network-scripts network; do
 857         [ -f "/etc/sysconfig/$dir/ifcfg-$ifname" ] && {
 858             sed -n "s/BOOTPROTO=[\"']\?\([[:alnum:]]\{1,\}\)[\"']\?.*\$/\1/p" \
 859                 "/etc/sysconfig/$dir/ifcfg-$ifname"
 860             return
 861         }
 862     done
 863 }
 864
 865 is_unbracketed_ipv6_address() {
 866     strglob "$1" '*:*' && ! strglob "$1" '\[*:*\]'
 867 }
 868
 869 # Create an ip= string to set up networking such that the given
 870 # remote address can be reached
 871 ip_params_for_remote_addr() {
 872     local remote_addr=$1
 873     local ifname local_addr peer netmask gateway ifmac
 874
 875     [[ $remote_addr ]] || return 1
 876     ifname=$(iface_for_remote_addr "$remote_addr")
 877     [[ $ifname ]] || {
 878         berror "failed to determine interface to connect to $remote_addr"
 879         return 1
 880     }
 881
 882     # ifname clause to bind the interface name to a MAC address
 883     if [ -d "/sys/class/net/$ifname/bonding" ]; then
 884         dinfo "Found bonded interface '${ifname}'. Make sure to provide an appropriate 'bond=' cmdline."
 885     elif [ -e "/sys/class/net/$ifname/address" ]; then
 886         ifmac=$(cat "/sys/class/net/$ifname/address")
 887         [[ $ifmac ]] && printf 'ifname=%s:%s ' "${ifname}" "${ifmac}"
 888     fi
 889
 890     bootproto=$(bootproto_for_iface "$ifname")
 891     case $bootproto in
 892         dhcp | dhcp6 | auto6) ;;
 893         dhcp4)
 894             bootproto=dhcp
 895             ;;
 896         static* | "")
 897             bootproto=
 898             ;;
 899         *)
 900             derror "bootproto \"$bootproto\" is unsupported by dracut, trying static configuration"
 901             bootproto=
 902             ;;
 903     esac
 904     if [[ $bootproto ]]; then
 905         printf 'ip=%s:%s ' "${ifname}" "${bootproto}"
 906     else
 907         local_addr=$(local_addr_for_remote_addr "$remote_addr")
 908         [[ $local_addr ]] || {
 909             berror "failed to determine local address to connect to $remote_addr"
 910             return 1
 911         }
 912         peer=$(peer_for_addr "$local_addr")
 913         # Set peer or netmask, but not both
 914         [[ $peer ]] || netmask=$(netmask_for_addr "$local_addr")
 915         gateway=$(gateway_for_iface "$ifname" "$local_addr")
 916         # Quote IPv6 addresses with brackets
 917         is_unbracketed_ipv6_address "$local_addr" && local_addr="[$local_addr]"
 918         is_unbracketed_ipv6_address "$peer" && peer="[$peer]"
 919         is_unbracketed_ipv6_address "$gateway" && gateway="[$gateway]"
 920         printf 'ip=%s:%s:%s:%s::%s:none ' \
 921             "${local_addr}" "${peer}" "${gateway}" "${netmask}" "${ifname}"
 922     fi
 923
 924 }
 925
 926 # block_is_nbd <maj:min>
 927 # Check whether $1 is an nbd device
 928 block_is_nbd() {
 929     [[ -b /dev/block/$1 && $1 == 43:* ]]
 930 }
 931
 932 # block_is_iscsi <maj:min>
 933 # Check whether $1 is an iSCSI device
 934 block_is_iscsi() {
 935     local _dir
 936     local _dev=$1
 937     [[ -L "/sys/dev/block/$_dev" ]] || return
 938     _dir="$(readlink -f "/sys/dev/block/$_dev")" || return
 939     until [[ -d "$_dir/sys" || -d "$_dir/iscsi_session" ]]; do
 940         _dir="$_dir/.."
 941     done
 942     [[ -d "$_dir/iscsi_session" ]]
 943 }
 944
 945 # block_is_fcoe <maj:min>
 946 # Check whether $1 is an FCoE device
 947 # Will not work for HBAs that hide the ethernet aspect
 948 # completely and present a pure FC device
 949 block_is_fcoe() {
 950     local _dir
 951     local _dev=$1
 952     [[ -L "/sys/dev/block/$_dev" ]] || return
 953     _dir="$(readlink -f "/sys/dev/block/$_dev")"
 954     until [[ -d "$_dir/sys" ]]; do
 955         _dir="$_dir/.."
 956         if [[ -d "$_dir/subsystem" ]]; then
 957             subsystem=$(basename "$(readlink "$_dir"/subsystem)")
 958             [[ $subsystem == "fcoe" ]] && return 0
 959         fi
 960     done
 961     return 1
 962 }
 963
 964 # block_is_netdevice <maj:min>
 965 # Check whether $1 is a net device
 966 block_is_netdevice() {
 967     block_is_nbd "$1" || block_is_iscsi "$1" || block_is_fcoe "$1"
 968 }
 969
 970 # get the corresponding kernel modules of a /sys/class/*/* or/dev/* device
 971 get_dev_module() {
 972     local dev_attr_walk
 973     local dev_drivers
 974     dev_attr_walk=$(udevadm info -a "$1")
 975     dev_drivers=$(echo "$dev_attr_walk" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p')
 976     # if no kernel modules found and device is in a virtual subsystem, follow symlinks
 977     if [[ -z $dev_drivers && $(udevadm info -q path "$1") == "/devices/virtual"* ]]; then
 978         local dev_vkernel
 979         local dev_vsubsystem
 980         local dev_vpath
 981         dev_vkernel=$(echo "$dev_attr_walk" | sed -n 's/\s*KERNELS=="\(\S\+\)"/\1/p' | tail -1)
 982         dev_vsubsystem=$(echo "$dev_attr_walk" | sed -n 's/\s*SUBSYSTEMS=="\(\S\+\)"/\1/p' | tail -1)
 983         dev_vpath="/sys/devices/virtual/$dev_vsubsystem/$dev_vkernel"
 984         if [[ -n $dev_vkernel && -n $dev_vsubsystem && -d $dev_vpath ]]; then
 985             local dev_links
 986             local dev_link
 987             dev_links=$(find "$dev_vpath" -maxdepth 1 -type l ! -name "subsystem" -exec readlink {} \;)
 988             for dev_link in $dev_links; do
 989                 [[ -n $dev_drivers && ${dev_drivers: -1} != $'\n' ]] && dev_drivers+=$'\n'
 990                 dev_drivers+=$(udevadm info -a "$dev_vpath/$dev_link" \
 991                     | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p' \
 992                     | grep -v -e pcieport)
 993             done
 994         fi
 995     fi
 996     echo "$dev_drivers"
 997 }