| Current File : //lib/dracut/dracut-functions.sh |
#!/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
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" ]; }
# find a binary. If we were not passed the full path directly,
# search in the usual places to find the binary.
find_binary() {
if [[ -z ${1##/*} ]]; then
if [[ -x $1 ]] || { [[ "$1" == *.so* ]] && ldd "$1" &>/dev/null; }; then
printf "%s\n" "$1"
return 0
fi
fi
type -P "${1##*/}"
}
ldconfig_paths()
{
ldconfig -pN 2>/dev/null | grep -E -v '/(lib|lib64|usr/lib|usr/lib64)/[^/]*$' | sed -n 's,.* => \(.*\)/.*,\1,p' | sort | uniq
}
# Version comparision function. Assumes Linux style version scheme.
# $1 = version a
# $2 = comparision op (gt, ge, eq, le, lt, ne)
# $3 = version b
vercmp() {
local _n1=(${1//./ }) _op=$2 _n2=(${3//./ }) _i _res
for ((_i=0; ; _i++))
do
if [[ ! ${_n1[_i]}${_n2[_i]} ]]; then _res=0
elif ((${_n1[_i]:-0} > ${_n2[_i]:-0})); then _res=1
elif ((${_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() {
[[ -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() {
shopt -q -s extglob
set -- "${1//+(\/)//}"
shopt -q -u extglob
printf "%s\n" "${1%/}"
}
# 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="/" __current=($1)
IFS="/" __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() {
local evalstr
local found
[[ $1 ]] || return
unset ID_FS_TYPE
ID_FS_TYPE=$(blkid -u filesystem -o export -- "$1" \
| while read line || [ -n "$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 -oP "^$1 \K\S+$" "$get_maj_min_cache_file")"
fi
if ! [[ "$_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 \
$_pol \
/dev/mapper/* \
/dev/disk/by-uuid/* \
/dev/disk/by-label/* \
/dev/disk/by-partuuid/* \
/dev/disk/by-partlabel/* \
/dev/disk/by-id/* \
/dev/disk/by-path/* \
; do
[[ -e "$i" ]] || continue
[[ $i == /dev/mapper/control ]] && 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 _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
findmnt -e --fstab -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | { \
while read _majmin _dev || [ -n "$_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 "$1" | { \
while read _fs || [ -n "$_fs" ]; do
[[ $_fs ]] || continue
[[ $_fs = "autofs" ]] && continue
printf "%s" "$_fs"
return 0
done; return 1; } && return 0
fi
findmnt --fstab -e -v -n -o 'FSTYPE' --target "$1" | { \
while read _fs || [ -n "$_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 _fs || [ -n "$_fs" ]; do
[[ $_fs ]] || continue
[[ $_fs = "autofs" ]] && continue
printf "%s" "$_fs"
return 0
done; return 1; } && return 0
fi
findmnt --fstab -e -v -n -o 'FSTYPE' --source "$_find_dev" | { \
while read _fs || [ -n "$_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
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.
# Example:
# $ find_dev_fsopts /dev/sda2
# rw,relatime,discard,data=ordered
find_dev_fsopts() {
local _find_dev _opts
_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
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
[[ -d /sys/dev/block/$2/slaves ]] || return 1
for _x in /sys/dev/block/$2/slaves/*; do
[[ -f $_x/dev ]] || continue
[[ $_x/subsystem -ef /sys/class/block ]] || continue
check_block_and_slaves $1 $(<"$_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
[[ -d /sys/dev/block/$2/slaves ]] || return 1
for _x in /sys/dev/block/$2/slaves/*; do
[[ -f $_x/dev ]] || continue
[[ $_x/subsystem -ef /sys/class/block ]] || continue
check_block_and_slaves_all $1 $(<"$_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
}
# ugly workaround for the lvm design
# There is no volume group device,
# so, there are no slave devices for volume groups.
# Logical volumes only have the slave devices they really live on,
# but you cannot create the logical volume without the volume group.
# And the volume group might be bigger than the devices the LV needs.
check_vol_slaves() {
local _lv _vg _pv _dm _majmin
_majmin="$2"
_lv="/dev/block/$_majmin"
_dm=/sys/dev/block/$_majmin/dm
[[ -f $_dm/uuid && $(<$_dm/uuid) =~ LVM-* ]] || return 1
_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 _lv _vg _pv _majmin
_majmin="$2"
_lv="/dev/block/$_majmin"
_dm="/sys/dev/block/$_majmin/dm"
[[ -f $_dm/uuid && $(<$_dm/uuid) =~ LVM-* ]] || return 1
_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_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=,
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="$1"
local _config_file
[[ -f /boot/config-$kernel ]] \
&& _config_file="/boot/config-$kernel"
[[ -f /lib/modules/$kernel/config ]] \
&& _config_file="/lib/modules/$kernel/config"
# no kernel config file, so return true
[[ $_config_file ]] || return 0
grep -q -F "${_config_opt}=" "$_config_file" && return 0
return 1
}
# get_cpu_vendor
# Only two values are returned: AMD or Intel
get_cpu_vendor ()
{
if grep -qE AMD /proc/cpuinfo; then
printf "AMD"
fi
if grep -qE Intel /proc/cpuinfo; then
printf "Intel"
fi
}
# get_host_ucode
# Get the hosts' ucode file based on the /proc/cpuinfo
get_ucode_file ()
{
local family=`grep -E "cpu family" /proc/cpuinfo | head -1 | sed s/.*:\ //`
local model=`grep -E "model" /proc/cpuinfo |grep -v name | head -1 | sed s/.*:\ //`
local stepping=`grep -E "stepping" /proc/cpuinfo | head -1 | sed s/.*:\ //`
if [[ "$(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} ${stepping}
fi
}
# Get currently loaded modules
# sorted, and delimited by newline
get_loaded_kernel_modules ()
{
local modules=( )
while read _module _size _used _used_by; do
modules+=( "$_module" )
done <<< "$(lsmod | sed -n '1!p')"
printf '%s\n' "${modules[@]}" | sort
}
# Not every device in /dev/mapper should be examined.
# If it is an LVM device, touch only devices which have /dev/VG/LV symlink.
lvm_internal_dev() {
local dev_dm_dir=/sys/dev/block/$1/dm
[[ ! -f $dev_dm_dir/uuid || $(<$dev_dm_dir/uuid) != LVM-* ]] && return 1 # Not an LVM device
local DM_VG_NAME DM_LV_NAME DM_LV_LAYER
eval $(dmsetup splitname --nameprefixes --noheadings --rows "$(<$dev_dm_dir/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 _dev _rest; do
str_starts "$_dev" "/" || continue
_dev=${_dev%,}
printf -- "%s\n" "$_dev"
done
}
# 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 nbd 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"
}