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dracut-functions.sh
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dracut-functions.sh
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#!/bin/bash
#
# functions used by dracut and other tools.
#
# Copyright 2005-2009 Red Hat, Inc. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
export LC_MESSAGES=C
# is_func <command>
# Check whether $1 is a function.
is_func() {
[[ "$(type -t "$1")" == "function" ]]
}
# Generic substring function. If $2 is in $1, return 0.
strstr() { [[ $1 == *"$2"* ]]; }
# Generic glob matching function. If glob pattern $2 matches anywhere in $1, OK
strglobin() { [[ $1 == *$2* ]]; }
# Generic glob matching function. If glob pattern $2 matches all of $1, OK
# shellcheck disable=SC2053
strglob() { [[ $1 == $2 ]]; }
# returns OK if $1 contains literal string $2 at the beginning, and isn't empty
str_starts() { [ "${1#"$2"*}" != "$1" ]; }
# returns OK if $1 contains literal string $2 at the end, and isn't empty
str_ends() { [ "${1%*"$2"}" != "$1" ]; }
trim() {
local var="$*"
var="${var#"${var%%[![:space:]]*}"}" # remove leading whitespace characters
var="${var%"${var##*[![:space:]]}"}" # remove trailing whitespace characters
printf "%s" "$var"
}
# find a binary. If we were not passed the full path directly,
# search in the usual places to find the binary.
find_binary() {
local _delim
local _path
local l
local p
[[ -z ${1##/*} ]] || _delim="/"
if [[ $1 == *.so* ]]; then
for l in $libdirs; do
_path="${l}${_delim}${1}"
if { $DRACUT_LDD "${dracutsysrootdir}${_path}" &> /dev/null; }; then
printf "%s\n" "${_path}"
return 0
fi
done
_path="${_delim}${1}"
if { $DRACUT_LDD "${dracutsysrootdir}${_path}" &> /dev/null; }; then
printf "%s\n" "${_path}"
return 0
fi
fi
if [[ $1 == */* ]]; then
_path="${_delim}${1}"
if [[ -L ${dracutsysrootdir}${_path} ]] || [[ -x ${dracutsysrootdir}${_path} ]]; then
printf "%s\n" "${_path}"
return 0
fi
fi
for p in $DRACUT_PATH; do
_path="${p}${_delim}${1}"
if [[ -L ${dracutsysrootdir}${_path} ]] || [[ -x ${dracutsysrootdir}${_path} ]]; then
printf "%s\n" "${_path}"
return 0
fi
done
[[ -n $dracutsysrootdir ]] && return 1
type -P "${1##*/}"
}
ldconfig_paths() {
$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
}
# Version comparison function. Assumes Linux style version scheme.
# $1 = version a
# $2 = comparison op (gt, ge, eq, le, lt, ne)
# $3 = version b
vercmp() {
local _n1
read -r -a _n1 <<< "${1//./ }"
local _op=$2
local _n2
read -r -a _n2 <<< "${3//./ }"
local _i _res
for ((_i = 0; ; _i++)); do
if [[ ! ${_n1[_i]}${_n2[_i]} ]]; then
_res=0
elif ((${_n1[_i]:-0} > ${_n2[_i]:-0})); then
_res=1
elif ((${_n1[_i]:-0} < ${_n2[_i]:-0})); then
_res=2
else
continue
fi
break
done
case $_op in
gt) ((_res == 1)) ;;
ge) ((_res != 2)) ;;
eq) ((_res == 0)) ;;
le) ((_res != 1)) ;;
lt) ((_res == 2)) ;;
ne) ((_res != 0)) ;;
esac
}
# Create all subdirectories for given path without creating the last element.
# $1 = path
mksubdirs() {
# shellcheck disable=SC2174
[[ -e ${1%/*} ]] || mkdir -m 0755 -p -- "${1%/*}"
}
# Function prints global variables in format name=value line by line.
# $@ = list of global variables' name
print_vars() {
local _var _value
for _var in "$@"; do
eval printf -v _value "%s" \""\$$_var"\"
[[ ${_value} ]] && printf '%s="%s"\n' "$_var" "$_value"
done
}
# normalize_path <path>
# Prints the normalized path, where it removes any duplicated
# and trailing slashes.
# Example:
# $ normalize_path ///test/test//
# /test/test
normalize_path() {
# shellcheck disable=SC2064
trap "$(shopt -p extglob)" RETURN
shopt -q -s extglob
local p=${1//+(\/)//}
printf "%s\n" "${p%/}"
}
# convert_abs_rel <from> <to>
# Prints the relative path, when creating a symlink to <to> from <from>.
# Example:
# $ convert_abs_rel /usr/bin/test /bin/test-2
# ../../bin/test-2
# $ ln -s $(convert_abs_rel /usr/bin/test /bin/test-2) /usr/bin/test
convert_abs_rel() {
local __current __absolute __abssize __cursize __newpath
local -i __i __level
set -- "$(normalize_path "$1")" "$(normalize_path "$2")"
# corner case #1 - self looping link
[[ $1 == "$2" ]] && {
printf "%s\n" "${1##*/}"
return
}
# corner case #2 - own dir link
[[ ${1%/*} == "$2" ]] && {
printf ".\n"
return
}
IFS=/ read -r -a __current <<< "$1"
IFS=/ read -r -a __absolute <<< "$2"
__abssize=${#__absolute[@]}
__cursize=${#__current[@]}
while [[ ${__absolute[__level]} == "${__current[__level]}" ]]; do
((__level++))
if ((__level > __abssize || __level > __cursize)); then
break
fi
done
for ((__i = __level; __i < __cursize - 1; __i++)); do
if ((__i > __level)); then
__newpath=$__newpath"/"
fi
__newpath=$__newpath".."
done
for ((__i = __level; __i < __abssize; __i++)); do
if [[ -n $__newpath ]]; then
__newpath=$__newpath"/"
fi
__newpath=$__newpath${__absolute[__i]}
done
printf -- "%s\n" "$__newpath"
}
# get_fs_env <device>
# Get and the ID_FS_TYPE variable from udev for a device.
# Example:
# $ get_fs_env /dev/sda2
# ext4
get_fs_env() {
[[ $1 ]] || return
unset ID_FS_TYPE
ID_FS_TYPE=$(blkid -u filesystem -o export -- "$1" \
| while read -r line || [ -n "$line" ]; do
if [[ $line == "TYPE="* ]]; then
printf "%s" "${line#TYPE=}"
exit 0
fi
done)
if [[ $ID_FS_TYPE ]]; then
printf "%s" "$ID_FS_TYPE"
return 0
fi
return 1
}
# get_maj_min <device>
# Prints the major and minor of a device node.
# Example:
# $ get_maj_min /dev/sda2
# 8:2
get_maj_min() {
local _majmin
local _out
if [[ $get_maj_min_cache_file ]]; then
_out="$(grep -m1 -oE "^${1//\\/\\\\} \S+$" "$get_maj_min_cache_file" | grep -oE "\S+$")"
fi
if ! [[ "$_out" ]]; then
_majmin="$(stat -L -c '%t:%T' "$1" 2> /dev/null)"
_out="$(printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))")"
if [[ $get_maj_min_cache_file ]]; then
echo "$1 $_out" >> "$get_maj_min_cache_file"
fi
fi
echo -n "$_out"
}
# get_devpath_block <device>
# get the DEVPATH in /sys of a block device
get_devpath_block() {
local _majmin _i
_majmin=$(get_maj_min "$1")
for _i in /sys/block/*/dev /sys/block/*/*/dev; do
[[ -e $_i ]] || continue
if [[ $_majmin == "$(< "$_i")" ]]; then
printf "%s" "${_i%/dev}"
return 0
fi
done
return 1
}
# get a persistent path from a device
get_persistent_dev() {
local i _tmp _dev _pol
_dev=$(get_maj_min "$1")
[ -z "$_dev" ] && return
if [[ -n $persistent_policy ]]; then
_pol="/dev/disk/${persistent_policy}/*"
else
_pol=
fi
for i in \
$_pol \
/dev/mapper/* \
/dev/disk/by-uuid/* \
/dev/disk/by-label/* \
/dev/disk/by-partuuid/* \
/dev/disk/by-partlabel/* \
/dev/disk/by-id/* \
/dev/disk/by-path/*; do
[[ -b $i ]] || continue
[[ $i == /dev/mapper/mpath* ]] && continue
_tmp=$(get_maj_min "$i")
if [ "$_tmp" = "$_dev" ]; then
printf -- "%s" "$i"
return
fi
done
printf -- "%s" "$1"
}
expand_persistent_dev() {
local _dev=$1
case "$_dev" in
LABEL=*)
_dev="/dev/disk/by-label/${_dev#LABEL=}"
;;
UUID=*)
_dev="${_dev#UUID=}"
_dev="${_dev,,}"
_dev="/dev/disk/by-uuid/${_dev}"
;;
PARTUUID=*)
_dev="${_dev#PARTUUID=}"
_dev="${_dev,,}"
_dev="/dev/disk/by-partuuid/${_dev}"
;;
PARTLABEL=*)
_dev="/dev/disk/by-partlabel/${_dev#PARTLABEL=}"
;;
esac
printf "%s" "$_dev"
}
shorten_persistent_dev() {
local _dev="$1"
case "$_dev" in
/dev/disk/by-uuid/*)
printf "%s" "UUID=${_dev##*/}"
;;
/dev/disk/by-label/*)
printf "%s" "LABEL=${_dev##*/}"
;;
/dev/disk/by-partuuid/*)
printf "%s" "PARTUUID=${_dev##*/}"
;;
/dev/disk/by-partlabel/*)
printf "%s" "PARTLABEL=${_dev##*/}"
;;
*)
printf "%s" "$_dev"
;;
esac
}
# find_block_device <mountpoint>
# Prints the major and minor number of the block device
# for a given mountpoint.
# Unless $use_fstab is set to "yes" the functions
# uses /proc/self/mountinfo as the primary source of the
# information and only falls back to /etc/fstab, if the mountpoint
# is not found there.
# Example:
# $ find_block_device /usr
# 8:4
find_block_device() {
local _dev _majmin _find_mpt
_find_mpt="$1"
if [[ $use_fstab != yes ]]; then
[[ -d $_find_mpt/. ]]
findmnt -e -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | {
while read -r _majmin _dev || [ -n "$_dev" ]; do
if [[ -b $_dev ]]; then
if ! [[ $_majmin ]] || [[ $_majmin == 0:* ]]; then
_majmin=$(get_maj_min "$_dev")
fi
if [[ $_majmin ]]; then
printf "%s\n" "$_majmin"
else
printf "%s\n" "$_dev"
fi
return 0
fi
if [[ $_dev == *:* ]]; then
printf "%s\n" "$_dev"
return 0
fi
done
return 1
} && return 0
fi
# fall back to /etc/fstab
[[ ! -f "$dracutsysrootdir"/etc/fstab ]] && return 1
findmnt -e --fstab -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | {
while read -r _majmin _dev || [ -n "$_dev" ]; do
if ! [[ $_dev ]]; then
_dev="$_majmin"
unset _majmin
fi
if [[ -b $_dev ]]; then
[[ $_majmin ]] || _majmin=$(get_maj_min "$_dev")
if [[ $_majmin ]]; then
printf "%s\n" "$_majmin"
else
printf "%s\n" "$_dev"
fi
return 0
fi
if [[ $_dev == *:* ]]; then
printf "%s\n" "$_dev"
return 0
fi
done
return 1
} && return 0
return 1
}
# find_mp_fstype <mountpoint>
# Echo the filesystem type for a given mountpoint.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# No newline is appended!
# Example:
# $ find_mp_fstype /;echo
# ext4
find_mp_fstype() {
local _fs
if [[ $use_fstab != yes ]]; then
findmnt -e -v -n -o 'FSTYPE' --target "$1" | {
while read -r _fs || [ -n "$_fs" ]; do
[[ $_fs ]] || continue
[[ $_fs == "autofs" ]] && continue
printf "%s" "$_fs"
return 0
done
return 1
} && return 0
fi
[[ ! -f "$dracutsysrootdir"/etc/fstab ]] && return 1
findmnt --fstab -e -v -n -o 'FSTYPE' --target "$1" | {
while read -r _fs || [ -n "$_fs" ]; do
[[ $_fs ]] || continue
[[ $_fs == "autofs" ]] && continue
printf "%s" "$_fs"
return 0
done
return 1
} && return 0
return 1
}
# find_dev_fstype <device>
# Echo the filesystem type for a given device.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# No newline is appended!
# Example:
# $ find_dev_fstype /dev/sda2;echo
# ext4
find_dev_fstype() {
local _find_dev _fs
_find_dev="$1"
if ! [[ $_find_dev == /dev* ]]; then
[[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
fi
if [[ $use_fstab != yes ]]; then
findmnt -e -v -n -o 'FSTYPE' --source "$_find_dev" | {
while read -r _fs || [ -n "$_fs" ]; do
[[ $_fs ]] || continue
[[ $_fs == "autofs" ]] && continue
printf "%s" "$_fs"
return 0
done
return 1
} && return 0
fi
[[ ! -f "$dracutsysrootdir"/etc/fstab ]] && return 1
findmnt --fstab -e -v -n -o 'FSTYPE' --source "$_find_dev" | {
while read -r _fs || [ -n "$_fs" ]; do
[[ $_fs ]] || continue
[[ $_fs == "autofs" ]] && continue
printf "%s" "$_fs"
return 0
done
return 1
} && return 0
return 1
}
# find_mp_fsopts <mountpoint>
# Echo the filesystem options for a given mountpoint.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# No newline is appended!
# Example:
# $ find_mp_fsopts /;echo
# rw,relatime,discard,data=ordered
find_mp_fsopts() {
if [[ $use_fstab != yes ]]; then
findmnt -e -v -n -o 'OPTIONS' --target "$1" 2> /dev/null && return 0
fi
[[ ! -f "$dracutsysrootdir"/etc/fstab ]] && return 1
findmnt --fstab -e -v -n -o 'OPTIONS' --target "$1"
}
# find_dev_fsopts <device>
# Echo the filesystem options for a given device.
# /proc/self/mountinfo is taken as the primary source of information
# and /etc/fstab is used as a fallback.
# if `use_fstab == yes`, then only `/etc/fstab` is used.
#
# Example:
# $ find_dev_fsopts /dev/sda2
# rw,relatime,discard,data=ordered
find_dev_fsopts() {
local _find_dev
_find_dev="$1"
if ! [[ $_find_dev == /dev* ]]; then
[[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"
fi
if [[ $use_fstab != yes ]]; then
findmnt -e -v -n -o 'OPTIONS' --source "$_find_dev" 2> /dev/null && return 0
fi
[[ ! -f "$dracutsysrootdir"/etc/fstab ]] && return 1
findmnt --fstab -e -v -n -o 'OPTIONS' --source "$_find_dev"
}
# finds the major:minor of the block device backing the root filesystem.
find_root_block_device() { find_block_device /; }
# for_each_host_dev_fs <func>
# Execute "<func> <dev> <filesystem>" for every "<dev> <fs>" pair found
# in ${host_fs_types[@]}
for_each_host_dev_fs() {
local _func="$1"
local _dev
local _ret=1
[[ "${#host_fs_types[@]}" ]] || return 2
for _dev in "${!host_fs_types[@]}"; do
$_func "$_dev" "${host_fs_types[$_dev]}" && _ret=0
done
return $_ret
}
host_fs_all() {
printf "%s\n" "${host_fs_types[@]}"
}
# Walk all the slave relationships for a given block device.
# Stop when our helper function returns success
# $1 = function to call on every found block device
# $2 = block device in major:minor format
check_block_and_slaves() {
local _x
[[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
if ! lvm_internal_dev "$2"; then "$1" "$2" && return; fi
check_vol_slaves "$@" && return 0
if [[ -f /sys/dev/block/$2/../dev ]] && [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
check_block_and_slaves "$1" "$(< "/sys/dev/block/$2/../dev")" && return 0
fi
for _x in /sys/dev/block/"$2"/slaves/*; do
[[ -f $_x/dev ]] || continue
[[ $_x/subsystem -ef /sys/class/block ]] || continue
check_block_and_slaves "$1" "$(< "$_x/dev")" && return 0
done
return 1
}
check_block_and_slaves_all() {
local _x _ret=1
[[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
if ! lvm_internal_dev "$2" && "$1" "$2"; then
_ret=0
fi
check_vol_slaves_all "$@" && return 0
if [[ -f /sys/dev/block/$2/../dev ]] && [[ /sys/dev/block/$2/../subsystem -ef /sys/class/block ]]; then
check_block_and_slaves_all "$1" "$(< "/sys/dev/block/$2/../dev")" && _ret=0
fi
for _x in /sys/dev/block/"$2"/slaves/*; do
[[ -f $_x/dev ]] || continue
[[ $_x/subsystem -ef /sys/class/block ]] || continue
check_block_and_slaves_all "$1" "$(< "$_x/dev")" && _ret=0
done
return $_ret
}
# for_each_host_dev_and_slaves <func>
# Execute "<func> <dev>" for every "<dev>" found
# in ${host_devs[@]} and their slaves
for_each_host_dev_and_slaves_all() {
local _func="$1"
local _dev
local _ret=1
[[ "${host_devs[*]}" ]] || return 2
for _dev in "${host_devs[@]}"; do
[[ -b $_dev ]] || continue
if check_block_and_slaves_all "$_func" "$(get_maj_min "$_dev")"; then
_ret=0
fi
done
return $_ret
}
for_each_host_dev_and_slaves() {
local _func="$1"
local _dev
[[ "${host_devs[*]}" ]] || return 2
for _dev in "${host_devs[@]}"; do
[[ -b $_dev ]] || continue
check_block_and_slaves "$_func" "$(get_maj_min "$_dev")" && return 0
done
return 1
}
# /sys/dev/block/major:minor is symbol link to real hardware device
# go downstream $(realpath /sys/dev/block/major:minor) to detect driver
get_blockdev_drv_through_sys() {
local _block_mods=""
local _path
_path=$(realpath "$1")
while true; do
if [[ -L "$_path"/driver/module ]]; then
_mod=$(realpath "$_path"/driver/module)
_mod=$(basename "$_mod")
_block_mods="$_block_mods $_mod"
fi
_path=$(dirname "$_path")
if [[ $_path == '/sys/devices' ]] || [[ $_path == '/' ]]; then
break
fi
done
echo "$_block_mods"
}
# get_lvm_dm_dev <maj:min>
# If $1 is an LVM device-mapper device, return the path to its dm directory
get_lvm_dm_dev() {
local _majmin _dm
_majmin="$1"
_dm=/sys/dev/block/$_majmin/dm
[[ ! -f $_dm/uuid || $(< "$_dm"/uuid) != LVM-* ]] && return 1
printf "%s" "$_dm"
}
# ugly workaround for the lvm design
# There is no volume group device,
# so, there are no slave devices for volume groups.
# Logical volumes only have the slave devices they really live on,
# but you cannot create the logical volume without the volume group.
# And the volume group might be bigger than the devices the LV needs.
check_vol_slaves() {
local _vg _pv _majmin _dm
_majmin="$2"
_dm=$(get_lvm_dm_dev "$_majmin")
[[ -z $_dm ]] && return 1 # not an LVM device-mapper device
_vg=$(dmsetup splitname --noheadings -o vg_name "$(< "$_dm/name")")
# strip space
_vg="${_vg//[[:space:]]/}"
if [[ $_vg ]]; then
for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2> /dev/null); do
check_block_and_slaves "$1" "$(get_maj_min "$_pv")" && return 0
done
fi
return 1
}
check_vol_slaves_all() {
local _vg _pv _majmin _dm
_majmin="$2"
_dm=$(get_lvm_dm_dev "$_majmin")
[[ -z $_dm ]] && return 1 # not an LVM device-mapper device
_vg=$(dmsetup splitname --noheadings -o vg_name "$(< "$_dm/name")")
# strip space
_vg="${_vg//[[:space:]]/}"
if [[ $_vg ]]; then
# when filter/global_filter is set, lvm may be failed
if ! lvm lvs --noheadings -o vg_name "$_vg" 2> /dev/null 1> /dev/null; then
return 1
fi
for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2> /dev/null); do
check_block_and_slaves_all "$1" "$(get_maj_min "$_pv")"
done
return 0
fi
return 1
}
# fs_get_option <filesystem options> <search for option>
# search for a specific option in a bunch of filesystem options
# and return the value
fs_get_option() {
local _fsopts=$1
local _option=$2
local OLDIFS="$IFS"
IFS=,
# shellcheck disable=SC2086
set -- $_fsopts
IFS="$OLDIFS"
while [ $# -gt 0 ]; do
case $1 in
$_option=*)
echo "${1#"${_option}"=}"
break
;;
esac
shift
done
}
check_kernel_config() {
local _config_opt="$1"
local _config_file
[[ -f $dracutsysrootdir/boot/config-$kernel ]] \
&& _config_file="/boot/config-$kernel"
[[ -f $dracutsysrootdir/lib/modules/$kernel/config ]] \
&& _config_file="/lib/modules/$kernel/config"
# no kernel config file, so return true
[[ $_config_file ]] || return 0
grep -q -F "${_config_opt}=" "$dracutsysrootdir$_config_file" && return 0
return 1
}
# 0 if the kernel module is either built-in or available
# 1 if the kernel module is not enabled
check_kernel_module() {
modprobe -d "$dracutsysrootdir" -S "$kernel" --dry-run "$1" &> /dev/null || return 1
}
# get_cpu_vendor
# Only two values are returned: AMD or Intel
get_cpu_vendor() {
if grep -qE AMD /proc/cpuinfo; then
printf "AMD"
fi
if grep -qE Intel /proc/cpuinfo; then
printf "Intel"
fi
}
# get_host_ucode
# Get the hosts' ucode file based on the /proc/cpuinfo
get_ucode_file() {
local family
local model
local stepping
family=$(grep -E "cpu family" /proc/cpuinfo | head -1 | sed "s/.*:\ //")
model=$(grep -E "model" /proc/cpuinfo | grep -v name | head -1 | sed "s/.*:\ //")
stepping=$(grep -E "stepping" /proc/cpuinfo | head -1 | sed "s/.*:\ //")
if [[ "$(get_cpu_vendor)" == "AMD" ]]; then
if [[ $family -ge 21 ]]; then
printf "microcode_amd_fam%xh.bin" "$family"
else
printf "microcode_amd.bin"
fi
fi
if [[ "$(get_cpu_vendor)" == "Intel" ]]; then
# The /proc/cpuinfo are in decimal.
printf "%02x-%02x-%02x" "${family}" "${model}" "${stepping}"
fi
}
# Not every device in /dev/mapper should be examined.
# If it is an LVM device, touch only devices which have /dev/VG/LV symlink.
lvm_internal_dev() {
local _majmin _dm
_majmin="$1"
_dm=$(get_lvm_dm_dev "$_majmin")
[[ -z $_dm ]] && return 1 # not an LVM device-mapper device
local DM_VG_NAME DM_LV_NAME DM_LV_LAYER
eval "$(dmsetup splitname --nameprefixes --noheadings --rows "$(< "$_dm/name")" 2> /dev/null)"
[[ ${DM_VG_NAME} ]] && [[ ${DM_LV_NAME} ]] || return 0 # Better skip this!
[[ ${DM_LV_LAYER} ]] || [[ ! -L /dev/${DM_VG_NAME}/${DM_LV_NAME} ]]
}
btrfs_devs() {
local _mp="$1"
btrfs device usage "$_mp" \
| while read -r _dev _; do
str_starts "$_dev" "/" || continue
_dev=${_dev%,}
printf -- "%s\n" "$_dev"
done
}
zfs_devs() {
local _mp="$1"
zpool list -H -v -P "${_mp%%/*}" | awk -F$'\t' '$2 ~ /^\// {print $2}' \
| while read -r _dev; do
realpath "${_dev}"
done
}
iface_for_remote_addr() {
# shellcheck disable=SC2046
set -- $(ip -o route get to "$1")
while [ $# -gt 0 ]; do
case $1 in
dev)
echo "$2"
return
;;
esac
shift
done
}
local_addr_for_remote_addr() {
# shellcheck disable=SC2046
set -- $(ip -o route get to "$1")
while [ $# -gt 0 ]; do
case $1 in
src)
echo "$2"
return
;;
esac
shift
done
}
peer_for_addr() {
local addr=$1
local qtd
# quote periods in IPv4 address
qtd=${addr//./\\.}
ip -o addr show \
| sed -n 's%^.* '"$qtd"' peer \([0-9a-f.:]\{1,\}\(/[0-9]*\)\?\).*$%\1%p'
}
netmask_for_addr() {
local addr=$1
local qtd
# quote periods in IPv4 address
qtd=${addr//./\\.}
ip -o addr show | sed -n 's,^.* '"$qtd"'/\([0-9]*\) .*$,\1,p'
}
gateway_for_iface() {
local ifname=$1 addr=$2
case $addr in
*.*) proto=4 ;;
*:*) proto=6 ;;
*) return ;;
esac
ip -o -$proto route show \
| sed -n "s/^default via \([0-9a-z.:]\{1,\}\) dev $ifname .*\$/\1/p"
}
# This works only for ifcfg-style network configuration!
bootproto_for_iface() {
local ifname=$1
local dir
# follow ifcfg settings for boot protocol
for dir in network-scripts network; do
[ -f "/etc/sysconfig/$dir/ifcfg-$ifname" ] && {
sed -n "s/BOOTPROTO=[\"']\?\([[:alnum:]]\{1,\}\)[\"']\?.*\$/\1/p" \
"/etc/sysconfig/$dir/ifcfg-$ifname"
return
}
done
}
is_unbracketed_ipv6_address() {
strglob "$1" '*:*' && ! strglob "$1" '\[*:*\]'
}
# Create an ip= string to set up networking such that the given
# remote address can be reached
ip_params_for_remote_addr() {
local remote_addr=$1
local ifname local_addr peer netmask gateway ifmac
[[ $remote_addr ]] || return 1
ifname=$(iface_for_remote_addr "$remote_addr")
[[ $ifname ]] || {
berror "failed to determine interface to connect to $remote_addr"
return 1
}
# ifname clause to bind the interface name to a MAC address
if [ -d "/sys/class/net/$ifname/bonding" ]; then
dinfo "Found bonded interface '${ifname}'. Make sure to provide an appropriate 'bond=' cmdline."
elif [ -e "/sys/class/net/$ifname/address" ]; then
ifmac=$(cat "/sys/class/net/$ifname/address")
[[ $ifmac ]] && printf 'ifname=%s:%s ' "${ifname}" "${ifmac}"
fi
bootproto=$(bootproto_for_iface "$ifname")
case $bootproto in
dhcp | dhcp6 | auto6) ;;
dhcp4)
bootproto=dhcp
;;
static* | "")
bootproto=
;;
*)
derror "bootproto \"$bootproto\" is unsupported by dracut, trying static configuration"
bootproto=
;;
esac
if [[ $bootproto ]]; then
printf 'ip=%s:%s ' "${ifname}" "${bootproto}"
else
local_addr=$(local_addr_for_remote_addr "$remote_addr")
[[ $local_addr ]] || {
berror "failed to determine local address to connect to $remote_addr"
return 1
}
peer=$(peer_for_addr "$local_addr")
# Set peer or netmask, but not both
[[ $peer ]] || netmask=$(netmask_for_addr "$local_addr")
gateway=$(gateway_for_iface "$ifname" "$local_addr")
# Quote IPv6 addresses with brackets
is_unbracketed_ipv6_address "$local_addr" && local_addr="[$local_addr]"
is_unbracketed_ipv6_address "$peer" && peer="[$peer]"
is_unbracketed_ipv6_address "$gateway" && gateway="[$gateway]"
printf 'ip=%s:%s:%s:%s::%s:none ' \
"${local_addr}" "${peer}" "${gateway}" "${netmask}" "${ifname}"
fi
}
# block_is_nbd <maj:min>
# Check whether $1 is an nbd device
block_is_nbd() {
[[ -b /dev/block/$1 && $1 == 43:* ]]
}
# block_is_iscsi <maj:min>
# Check whether $1 is an iSCSI device
block_is_iscsi() {
local _dir
local _dev=$1
[[ -L "/sys/dev/block/$_dev" ]] || return
_dir="$(readlink -f "/sys/dev/block/$_dev")" || return
until [[ -d "$_dir/sys" || -d "$_dir/iscsi_session" ]]; do
_dir="$_dir/.."
done
[[ -d "$_dir/iscsi_session" ]]
}
# block_is_fcoe <maj:min>
# Check whether $1 is an FCoE device
# Will not work for HBAs that hide the ethernet aspect
# completely and present a pure FC device
block_is_fcoe() {
local _dir
local _dev=$1
[[ -L "/sys/dev/block/$_dev" ]] || return
_dir="$(readlink -f "/sys/dev/block/$_dev")"
until [[ -d "$_dir/sys" ]]; do
_dir="$_dir/.."
if [[ -d "$_dir/subsystem" ]]; then
subsystem=$(basename "$(readlink "$_dir"/subsystem)")
[[ $subsystem == "fcoe" ]] && return 0
fi
done
return 1
}
# block_is_netdevice <maj:min>
# Check whether $1 is a net device
block_is_netdevice() {
block_is_nbd "$1" || block_is_iscsi "$1" || block_is_fcoe "$1"
}
# convert the driver name given by udevadm to the corresponding kernel module name
get_module_name() {
local dev_driver
while read -r dev_driver; do
case "$dev_driver" in