#!/bin/bash

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#

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# functions used by dracut and other tools.

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#

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# Copyright 2005-2009 Red Hat, Inc. All rights reserved.

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#

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# This program is free software; you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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# the Free Software Foundation; either version 2 of the License, or

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# (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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# along with this program. If not, see <http://www.gnu.org/licenses/>.

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#

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export LC_MESSAGES=C

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# is_func <command>

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# Check whether $1 is a function.

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is_func() {

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[[ "$(type -t "$1")" = "function" ]]

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}

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# Generic substring function. If $2 is in $1, return 0.

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strstr() { [[ $1 = *"$2"* ]]; }

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# Generic glob matching function. If glob pattern $2 matches anywhere in $1, OK

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strglobin() { [[ $1 = *$2* ]]; }

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# Generic glob matching function. If glob pattern $2 matches all of $1, OK

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strglob() { [[ $1 = $2 ]]; }

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# returns OK if $1 contains literal string $2 at the beginning, and isn't empty

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str_starts() { [ "${1#"$2"*}" != "$1" ]; }

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# returns OK if $1 contains literal string $2 at the end, and isn't empty

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str_ends() { [ "${1%*"$2"}" != "$1" ]; }

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# find a binary. If we were not passed the full path directly,

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# search in the usual places to find the binary.

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find_binary() {

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if [[ -z ${1##/*} ]]; then

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if [[ -x $1 ]] || { [[ "$1" == *.so* ]] && ldd "$1" &>/dev/null; }; then

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printf "%s\n" "$1"

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return 0

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fi

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fi

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type -P "${1##*/}"

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}

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ldconfig_paths()

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{

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ldconfig -pN 2>/dev/null | grep -E -v '/(lib|lib64|usr/lib|usr/lib64)/[^/]*$' | sed -n 's,.* => \(.*\)/.*,\1,p' | sort | uniq

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}

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# Version comparision function. Assumes Linux style version scheme.

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# $1 = version a

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# $2 = comparision op (gt, ge, eq, le, lt, ne)

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# $3 = version b

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vercmp() {

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local _n1=(${1//./ }) _op=$2 _n2=(${3//./ }) _i _res

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for ((_i=0; ; _i++))

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do

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if [[ ! ${_n1[_i]}${_n2[_i]} ]]; then _res=0

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elif ((${_n1[_i]:-0} > ${_n2[_i]:-0})); then _res=1

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elif ((${_n1[_i]:-0} < ${_n2[_i]:-0})); then _res=2

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else continue

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fi

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break

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done

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case $_op in

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gt) ((_res == 1));;

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ge) ((_res != 2));;

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eq) ((_res == 0));;

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le) ((_res != 1));;

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lt) ((_res == 2));;

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ne) ((_res != 0));;

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esac

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}

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# Create all subdirectories for given path without creating the last element.

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# $1 = path

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mksubdirs() {

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[[ -e ${1%/*} ]] || mkdir -m 0755 -p -- "${1%/*}"

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}

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# Function prints global variables in format name=value line by line.

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# $@ = list of global variables' name

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print_vars() {

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local _var _value

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for _var in "$@"

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do

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eval printf -v _value "%s" \""\$$_var"\"

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[[ ${_value} ]] && printf '%s="%s"\n' "$_var" "$_value"

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done

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}

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# normalize_path <path>

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# Prints the normalized path, where it removes any duplicated

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# and trailing slashes.

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# Example:

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# $ normalize_path ///test/test//

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# /test/test

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normalize_path() {

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shopt -q -s extglob

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set -- "${1//+(\/)//}"

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shopt -q -u extglob

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printf "%s\n" "${1%/}"

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}

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# convert_abs_rel <from> <to>

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# Prints the relative path, when creating a symlink to <to> from <from>.

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# Example:

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# $ convert_abs_rel /usr/bin/test /bin/test-2

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# ../../bin/test-2

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# $ ln -s $(convert_abs_rel /usr/bin/test /bin/test-2) /usr/bin/test

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convert_abs_rel() {

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local __current __absolute __abssize __cursize __newpath

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local -i __i __level

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set -- "$(normalize_path "$1")" "$(normalize_path "$2")"

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# corner case #1 - self looping link

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[[ "$1" == "$2" ]] && { printf "%s\n" "${1##*/}"; return; }

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# corner case #2 - own dir link

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[[ "${1%/*}" == "$2" ]] && { printf ".\n"; return; }

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IFS="/" __current=($1)

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IFS="/" __absolute=($2)

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__abssize=${#__absolute[@]}

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__cursize=${#__current[@]}

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while [[ "${__absolute[__level]}" == "${__current[__level]}" ]]

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do

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(( __level++ ))

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if (( __level > __abssize || __level > __cursize ))

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then

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break

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fi

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done

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for ((__i = __level; __i < __cursize-1; __i++))

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do

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if ((__i > __level))

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then

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__newpath=$__newpath"/"

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fi

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__newpath=$__newpath".."

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done

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for ((__i = __level; __i < __abssize; __i++))

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do

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if [[ -n $__newpath ]]

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then

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__newpath=$__newpath"/"

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fi

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__newpath=$__newpath${__absolute[__i]}

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done

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printf "%s\n" "$__newpath"

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}

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# get_fs_env <device>

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# Get and the ID_FS_TYPE variable from udev for a device.

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# Example:

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# $ get_fs_env /dev/sda2

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# ext4

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get_fs_env() {

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local evalstr

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local found

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[[ $1 ]] || return

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unset ID_FS_TYPE

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ID_FS_TYPE=$(blkid -u filesystem -o export -- "$1" \

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| while read line || [ -n "$line" ]; do

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if [[ "$line" == TYPE\=* ]]; then

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printf "%s" "${line#TYPE=}";

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exit 0;

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fi

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done)

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if [[ $ID_FS_TYPE ]]; then

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printf "%s" "$ID_FS_TYPE"

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return 0

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fi

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return 1

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}

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# get_maj_min <device>

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# Prints the major and minor of a device node.

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# Example:

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# $ get_maj_min /dev/sda2

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# 8:2

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get_maj_min() {

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local _majmin

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local _out

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if [[ $get_maj_min_cache_file ]]; then

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_out="$(grep -m1 -oP "^$1 \K\S+$" "$get_maj_min_cache_file")"

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fi

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if ! [[ "$_out" ]]; then

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_majmin="$(stat -L -c '%t:%T' "$1" 2>/dev/null)"

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_out="$(printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))")"

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if [[ $get_maj_min_cache_file ]]; then

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echo "$1 $_out" >> "$get_maj_min_cache_file"

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fi

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fi

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echo -n "$_out"

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}

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# get_devpath_block <device>

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# get the DEVPATH in /sys of a block device

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get_devpath_block() {

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local _majmin _i

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_majmin=$(get_maj_min "$1")

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for _i in /sys/block/*/dev /sys/block/*/*/dev; do

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[[ -e "$_i" ]] || continue

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if [[ "$_majmin" == "$(<"$_i")" ]]; then

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printf "%s" "${_i%/dev}"

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return 0

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fi

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done

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return 1

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}

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# get a persistent path from a device

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get_persistent_dev() {

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local i _tmp _dev _pol

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_dev=$(get_maj_min "$1")

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[ -z "$_dev" ] && return

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if [[ -n "$persistent_policy" ]]; then

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_pol="/dev/disk/${persistent_policy}/*"

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else

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_pol=

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fi

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for i in \

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$_pol \

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/dev/mapper/* \

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/dev/disk/by-uuid/* \

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/dev/disk/by-label/* \

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/dev/disk/by-partuuid/* \

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/dev/disk/by-partlabel/* \

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/dev/disk/by-id/* \

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/dev/disk/by-path/* \

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; do

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[[ -e "$i" ]] || continue

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[[ $i == /dev/mapper/control ]] && continue

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[[ $i == /dev/mapper/mpath* ]] && continue

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_tmp=$(get_maj_min "$i")

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if [ "$_tmp" = "$_dev" ]; then

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printf -- "%s" "$i"

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return

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fi

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done

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printf -- "%s" "$1"

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}

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expand_persistent_dev() {

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local _dev=$1

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case "$_dev" in

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LABEL=*)

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_dev="/dev/disk/by-label/${_dev#LABEL=}"

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;;

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UUID=*)

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_dev="${_dev#UUID=}"

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_dev="${_dev,,}"

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_dev="/dev/disk/by-uuid/${_dev}"

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;;

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PARTUUID=*)

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_dev="${_dev#PARTUUID=}"

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_dev="${_dev,,}"

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_dev="/dev/disk/by-partuuid/${_dev}"

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;;

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PARTLABEL=*)

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_dev="/dev/disk/by-partlabel/${_dev#PARTLABEL=}"

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;;

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esac

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printf "%s" "$_dev"

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}

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shorten_persistent_dev() {

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local _dev="$1"

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case "$_dev" in

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/dev/disk/by-uuid/*)

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printf "%s" "UUID=${_dev##*/}";;

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/dev/disk/by-label/*)

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printf "%s" "LABEL=${_dev##*/}";;

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/dev/disk/by-partuuid/*)

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printf "%s" "PARTUUID=${_dev##*/}";;

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/dev/disk/by-partlabel/*)

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printf "%s" "PARTLABEL=${_dev##*/}";;

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*)

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printf "%s" "$_dev";;

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esac

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}

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# find_block_device <mountpoint>

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# Prints the major and minor number of the block device

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# for a given mountpoint.

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# Unless $use_fstab is set to "yes" the functions

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# uses /proc/self/mountinfo as the primary source of the

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# information and only falls back to /etc/fstab, if the mountpoint

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# is not found there.

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# Example:

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# $ find_block_device /usr

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# 8:4

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find_block_device() {

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local _dev _majmin _find_mpt

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_find_mpt="$1"

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if [[ $use_fstab != yes ]]; then

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[[ -d $_find_mpt/. ]]

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findmnt -e -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | { \

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while read _majmin _dev || [ -n "$_dev" ]; do

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if [[ -b $_dev ]]; then

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if ! [[ $_majmin ]] || [[ $_majmin == 0:* ]]; then

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_majmin=$(get_maj_min $_dev)

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fi

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if [[ $_majmin ]]; then

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printf "%s\n" "$_majmin"

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else

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printf "%s\n" "$_dev"

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fi

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return 0

[335] Fix | Delete

fi

[336] Fix | Delete

if [[ $_dev = *:* ]]; then

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printf "%s\n" "$_dev"

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return 0

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fi

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done; return 1; } && return 0

[341] Fix | Delete

fi

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# fall back to /etc/fstab

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[344] Fix | Delete

findmnt -e --fstab -v -n -o 'MAJ:MIN,SOURCE' --target "$_find_mpt" | { \

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while read _majmin _dev || [ -n "$_dev" ]; do

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if ! [[ $_dev ]]; then

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_dev="$_majmin"

[348] Fix | Delete

unset _majmin

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fi

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if [[ -b $_dev ]]; then

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[[ $_majmin ]] || _majmin=$(get_maj_min $_dev)

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if [[ $_majmin ]]; then

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printf "%s\n" "$_majmin"

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else

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printf "%s\n" "$_dev"

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fi

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return 0

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fi

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if [[ $_dev = *:* ]]; then

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printf "%s\n" "$_dev"

[361] Fix | Delete

return 0

[362] Fix | Delete

fi

[363] Fix | Delete

done; return 1; } && return 0

[364] Fix | Delete

[365] Fix | Delete

return 1

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}

[367] Fix | Delete

[368] Fix | Delete

# find_mp_fstype <mountpoint>

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# Echo the filesystem type for a given mountpoint.

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# /proc/self/mountinfo is taken as the primary source of information

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# and /etc/fstab is used as a fallback.

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# No newline is appended!

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# Example:

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# $ find_mp_fstype /;echo

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# ext4

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find_mp_fstype() {

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local _fs

[378] Fix | Delete

[379] Fix | Delete

if [[ $use_fstab != yes ]]; then

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findmnt -e -v -n -o 'FSTYPE' --target "$1" | { \

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while read _fs || [ -n "$_fs" ]; do

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[[ $_fs ]] || continue

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[[ $_fs = "autofs" ]] && continue

[384] Fix | Delete

printf "%s" "$_fs"

[385] Fix | Delete

return 0

[386] Fix | Delete

done; return 1; } && return 0

[387] Fix | Delete

fi

[388] Fix | Delete

[389] Fix | Delete

findmnt --fstab -e -v -n -o 'FSTYPE' --target "$1" | { \

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while read _fs || [ -n "$_fs" ]; do

[391] Fix | Delete

[[ $_fs ]] || continue

[392] Fix | Delete

[[ $_fs = "autofs" ]] && continue

[393] Fix | Delete

printf "%s" "$_fs"

[394] Fix | Delete

return 0

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done; return 1; } && return 0

[396] Fix | Delete

[397] Fix | Delete

return 1

[398] Fix | Delete

}

[399] Fix | Delete

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# find_dev_fstype <device>

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# Echo the filesystem type for a given device.

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# /proc/self/mountinfo is taken as the primary source of information

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# and /etc/fstab is used as a fallback.

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# No newline is appended!

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# Example:

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# $ find_dev_fstype /dev/sda2;echo

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# ext4

[408] Fix | Delete

find_dev_fstype() {

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local _find_dev _fs

[410] Fix | Delete

_find_dev="$1"

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if ! [[ "$_find_dev" = /dev* ]]; then

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[[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"

[413] Fix | Delete

fi

[414] Fix | Delete

[415] Fix | Delete

if [[ $use_fstab != yes ]]; then

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findmnt -e -v -n -o 'FSTYPE' --source "$_find_dev" | { \

[417] Fix | Delete

while read _fs || [ -n "$_fs" ]; do

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[[ $_fs ]] || continue

[419] Fix | Delete

[[ $_fs = "autofs" ]] && continue

[420] Fix | Delete

printf "%s" "$_fs"

[421] Fix | Delete

return 0

[422] Fix | Delete

done; return 1; } && return 0

[423] Fix | Delete

fi

[424] Fix | Delete

[425] Fix | Delete

findmnt --fstab -e -v -n -o 'FSTYPE' --source "$_find_dev" | { \

[426] Fix | Delete

while read _fs || [ -n "$_fs" ]; do

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[[ $_fs ]] || continue

[428] Fix | Delete

[[ $_fs = "autofs" ]] && continue

[429] Fix | Delete

printf "%s" "$_fs"

[430] Fix | Delete

return 0

[431] Fix | Delete

done; return 1; } && return 0

[432] Fix | Delete

[433] Fix | Delete

return 1

[434] Fix | Delete

}

[435] Fix | Delete

[436] Fix | Delete

# find_mp_fsopts <mountpoint>

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# Echo the filesystem options for a given mountpoint.

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# /proc/self/mountinfo is taken as the primary source of information

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# and /etc/fstab is used as a fallback.

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# No newline is appended!

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# Example:

[442] Fix | Delete

# $ find_mp_fsopts /;echo

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# rw,relatime,discard,data=ordered

[444] Fix | Delete

find_mp_fsopts() {

[445] Fix | Delete

if [[ $use_fstab != yes ]]; then

[446] Fix | Delete

findmnt -e -v -n -o 'OPTIONS' --target "$1" 2>/dev/null && return 0

[447] Fix | Delete

fi

[448] Fix | Delete

[449] Fix | Delete

findmnt --fstab -e -v -n -o 'OPTIONS' --target "$1"

[450] Fix | Delete

}

[451] Fix | Delete

[452] Fix | Delete

# find_dev_fsopts <device>

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# Echo the filesystem options for a given device.

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# /proc/self/mountinfo is taken as the primary source of information

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# and /etc/fstab is used as a fallback.

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# Example:

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# $ find_dev_fsopts /dev/sda2

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# rw,relatime,discard,data=ordered

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find_dev_fsopts() {

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local _find_dev _opts

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_find_dev="$1"

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if ! [[ "$_find_dev" = /dev* ]]; then

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[[ -b "/dev/block/$_find_dev" ]] && _find_dev="/dev/block/$_find_dev"

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fi

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if [[ $use_fstab != yes ]]; then

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findmnt -e -v -n -o 'OPTIONS' --source "$_find_dev" 2>/dev/null && return 0

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fi

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findmnt --fstab -e -v -n -o 'OPTIONS' --source "$_find_dev"

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}

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# finds the major:minor of the block device backing the root filesystem.

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find_root_block_device() { find_block_device /; }

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# for_each_host_dev_fs <func>

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# Execute "<func> <dev> <filesystem>" for every "<dev> <fs>" pair found

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# in ${host_fs_types[@]}

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for_each_host_dev_fs()

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{

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local _func="$1"

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local _dev

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local _ret=1

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[[ "${#host_fs_types[@]}" ]] || return 2

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for _dev in "${!host_fs_types[@]}"; do

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$_func "$_dev" "${host_fs_types[$_dev]}" && _ret=0

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done

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return $_ret

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}

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host_fs_all()

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{

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printf "%s\n" "${host_fs_types[@]}"

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}

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