which() { # on some systems 'which' command is considered deprecated and not installed by default # 'command -v' replacement does not work exactly the same way. it outputs shell aliases if present # $1 - executable name local IFS=: for p in $PATH; do [ -x "$p/$1" ] && { echo "$p/$1" return 0 } done return 1 } exists() { which "$1" >/dev/null 2>/dev/null } existf() { type "$1" >/dev/null 2>/dev/null } whichq() { which $1 2>/dev/null } exist_all() { while [ -n "$1" ]; do exists "$1" || return 1 shift done return 0 } on_off_function() { # $1 : function name on # $2 : function name off # $3 : 0 - off, 1 - on local F="$1" [ "$3" = "1" ] || F="$2" shift shift shift "$F" "$@" } contains() { # check if substring $2 contains in $1 [ "${1#*$2}" != "$1" ] } starts_with() { # $1 : what # $2 : starts with case "$1" in "$2"*) return 0 ;; esac return 1 } find_str_in_list() { [ -n "$1" ] && { for v in $2; do [ "$v" = "$1" ] && return 0 done } return 1 } end_with_newline() { local c="$(tail -c 1)" [ "$c" = "" ] } append_separator_list() { # $1 - var name to receive result # $2 - separator # $3 - quoter # $4,$5,... - elements local _var="$1" sep="$2" quo="$3" i eval i="\$$_var" shift; shift; shift while [ -n "$1" ]; do if [ -n "$i" ] ; then i="$i$sep$quo$1$quo" else i="$quo$1$quo" fi shift done eval $_var="\$i" } make_separator_list() { eval $1='' append_separator_list "$@" } make_comma_list() { # $1 - var name to receive result # $2,$3,... - elements local var="$1" shift make_separator_list $var , '' "$@" } make_quoted_comma_list() { # $1 - var name to receive result # $2,$3,... - elements local var="$1" shift make_separator_list $var , '"' "$@" } unique() { local i for i in "$@"; do echo $i; done | sort -u | xargs } is_linked_to_busybox() { local IFS F P IFS=: for path in $PATH; do F=$path/$1 P="$(readlink $F)" if [ -z "$P" ] && [ -x $F ] && [ ! -L $F ]; then return 1; fi [ "${P%busybox*}" != "$P" ] && return done } get_dir_inode() { local dir="$1" [ -L "$dir" ] && dir=$(readlink "$dir") ls -id "$dir" | awk '{print $1}' } linux_min_version() { # $1 - major ver # $2 - minor ver local V1=$(sed -nre 's/^Linux version ([0-9]+)\.[0-9]+.*$/\1/p' /proc/version) local V2=$(sed -nre 's/^Linux version [0-9]+\.([0-9]+).*$/\1/p' /proc/version) [ -n "$V1" -a -n "$V2" ] && [ "$V1" -gt "$1" -o "$V1" -eq "$1" -a "$V2" -ge "$2" ] } linux_get_subsys() { local INIT="$(sed 's/\x0/\n/g' /proc/1/cmdline | head -n 1)" [ -L "$INIT" ] && INIT=$(readlink "$INIT") INIT=$(basename "$INIT") if [ -f "/etc/openwrt_release" ] && [ "$INIT" = "procd" ] ; then SUBSYS=openwrt elif [ -x "/bin/ndm" ] ; then SUBSYS=keenetic else # generic linux SUBSYS= fi } openwrt_fw3() { [ ! -x /sbin/fw4 -a -x /sbin/fw3 ] } openwrt_fw4() { [ -x /sbin/fw4 ] } openwrt_fw3_integration() { [ "$FWTYPE" = iptables ] && openwrt_fw3 } create_dev_stdin() { [ -e /dev/stdin ] || ln -s /proc/self/fd/0 /dev/stdin } call_for_multiple_items() { # $1 - function to get an item # $2 - variable name to put result into # $3 - space separated parameters to function $1 local i item items for i in $3; do $1 item $i [ -n "$item" ] && { if [ -n "$items" ]; then items="$items $item" else items="$item" fi } done eval $2=\"$items\" } fix_sbin_path() { local IFS=':' printf "%s\n" $PATH | grep -Fxq '/usr/sbin' || PATH="/usr/sbin:$PATH" printf "%s\n" $PATH | grep -Fxq '/sbin' || PATH="/sbin:$PATH" export PATH } # it can calculate floating point expr calc() { awk "BEGIN { print $*}"; } fsleep_setup() { [ -n "$FSLEEP" ] || { if sleep 0.001 2>/dev/null; then FSLEEP=1 elif busybox usleep 1 2>/dev/null; then FSLEEP=2 else local errtext="$(read -t 0.001 2>&1)" if [ -z "$errtext" ]; then FSLEEP=3 # newer openwrt has ucode with system function that supports timeout in ms elif ucode -e "system(['sleep','1'], 1)" 2>/dev/null; then FSLEEP=4 # older openwrt may have lua and nixio lua module elif lua -e 'require "nixio".nanosleep(0,1)' 2>/dev/null ; then FSLEEP=5 else FSLEEP=0 fi fi } } msleep() { # $1 - milliseconds case "$FSLEEP" in 1) sleep $(calc $1/1000) ;; 2) busybox usleep $(calc $1*1000) ;; 3) read -t $(calc $1/1000) ;; 4) ucode -e "system(['sleep','2147483647'], $1)" ;; 5) lua -e "require 'nixio'.nanosleep($(($1/1000)),$(calc $1%1000*1000000))" ;; *) sleep $((($1+999)/1000)) esac } minsleep() { msleep 100 } replace_char() { local a=$1 local b=$2 shift; shift echo "$@" | tr $a $b } setup_md5() { [ -n "$MD5" ] && return MD5=md5sum exists $MD5 || MD5=md5 } random() { # $1 - min, $2 - max local r rs setup_md5 if [ -c /dev/urandom ]; then read rs