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resolvconf.in
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#!/bin/sh
# Copyright (c) 2007-2025 Roy Marples
# All rights reserved
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
RESOLVCONF="$0"
OPENRESOLV_VERSION="3.14.1"
SYSCONFDIR=@SYSCONFDIR@
LIBEXECDIR=@LIBEXECDIR@
VARDIR=@VARDIR@
RCDIR=@RCDIR@
RESTARTCMD=@RESTARTCMD@
if [ "$1" = "--version" ]; then
echo "openresolv $OPENRESOLV_VERSION"
echo "Copyright (c) 2007-2025 Roy Marples"
exit 0
fi
# Disregard dhcpcd setting
unset interface_order state_dir
# If you change this, change the test in VFLAG and libc.in as well
local_nameservers="127.* 0.0.0.0 255.255.255.255 ::1"
dynamic_order="tap[0-9]* tun[0-9]* vpn vpn[0-9]* wg[0-9]* ppp[0-9]* ippp[0-9]*"
interface_order="lo lo[0-9]*"
name_server_blacklist="0.0.0.0"
# Poor mans cat
# /usr might not be available
cat()
{
OIFS="$IFS"
IFS=''
if [ -n "$1" ]; then
while read -r line; do
printf "%s\n" "$line"
done < "$1"
else
while read -r line; do
printf "%s\n" "$line"
done
fi
retval=$?
IFS="$OIFS"
return $retval
}
# Support original resolvconf configuration layout
# as well as the openresolv config file
if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then
. "$SYSCONFDIR"/resolvconf.conf
[ -n "$state_dir" ] && VARDIR="$state_dir"
elif [ -d "$SYSCONFDIR/resolvconf" ]; then
SYSCONFDIR="$SYSCONFDIR/resolvconf"
if [ -f "$SYSCONFDIR"/interface-order ]; then
interface_order="$(cat "$SYSCONFDIR"/interface-order)"
fi
fi
IFACEDIR="$VARDIR/interfaces"
METRICDIR="$VARDIR/metrics"
PRIVATEDIR="$VARDIR/private"
EXCLUSIVEDIR="$VARDIR/exclusive"
DEPRECATEDDIR="$VARDIR/deprecated"
LOCKDIR="$VARDIR/lock"
_PWD="$PWD"
warn()
{
echo "$*" >&2
}
error_exit()
{
echo "$*" >&2
exit 1
}
usage()
{
cat <<-EOF
Usage: ${RESOLVCONF##*/} [options] command [argument]
Inform the system about any DNS updates.
Commands:
-a \$INTERFACE Add DNS information to the specified interface
(DNS supplied via stdin in resolv.conf format)
-C \$PATTERN Deprecate DNS information for matched interfaces
-c \$PATTERN Configure DNS information for matched interfaces
-d \$INTERFACE Delete DNS information from the specified interface
-h Show this help cruft
-i [\$PATTERN] Show interfaces that have supplied DNS information
optionally from interfaces that match the specified
pattern
-l [\$PATTERN] Show DNS information, optionally from interfaces
that match the specified pattern
-L [\$PATTERN] Same as -l, but adjusted by our config
-u Run updates from our current DNS information
--version Echo the ${RESOLVCONF##*/} version
Options:
-f Ignore non existent interfaces
-m metric Give the added DNS information a metric
-p Mark the interface as private
-x Mark the interface as exclusive
Subscriber and System Init Commands:
-I Init the state dir
-r \$SERVICE Restart the system service
(restarting a non-existent or non-running service
should have no output and return 0)
-R Show the system service restart command
-v [\$PATTERN] echo NEWDOMAIN, NEWSEARCH and NEWNS variables to
the console
-V [\$PATTERN] Same as -v, but only uses configuration in
$SYSCONFDIR/resolvconf.conf
EOF
[ -z "$1" ] && exit 0
echo
error_exit "$*"
}
# Strip any trailing dot from each name as a FQDN does not belong
# in resolv.conf(5)
# If you think otherwise, capture a DNS trace and you'll see libc
# will strip it regardless.
# This also solves setting up duplicate zones in our subscribers.
# Also strip any comments denoted by #.
resolv_strip()
{
space=
for word; do
case "$word" in
\#*) break;;
esac
printf "%s%s" "$space${word%.}"
space=" "
done
printf "\n"
}
private_iface()
{
iface="$1"
# Allow expansion
cd "$IFACEDIR"
# Public interfaces override private ones.
for p in $public_interfaces; do
case "$iface" in
"$p"|"$p":*) return 1;;
esac
done
if [ -e "$PRIVATEDIR/$iface" ]; then
return 0
fi
for p in $private_interfaces; do
case "$iface" in
"$p"|"$p":*) return 0;;
esac
done
# Not a private interface
return 1
}
# Parse resolv.conf's and make variables
# for domain name servers, search name servers and global nameservers
parse_resolv()
{
domain=
new=true
newns=
ns=
private=false
search=
while read -r line; do
stripped_line="$(resolv_strip ${line#* })"
case "$line" in
"# resolv.conf from "*)
if ${new}; then
iface="${line#\# resolv.conf from *}"
new=false
if private_iface "$iface"; then
private=true
else
private=false
fi
fi
;;
"nameserver "*)
islocal=false
for l in $local_nameservers; do
case "$stripped_line" in
$l)
islocal=true
break
;;
esac
done
if $islocal; then
echo "LOCALNAMESERVERS=\"\$LOCALNAMESERVERS $stripped_line\""
else
ns="$ns$stripped_line "
fi
;;
"domain "*)
search="$stripped_line"
if [ -z "$domain" ]; then
domain="$search"
echo "DOMAIN=\"$domain\""
fi
;;
"search "*)
search="$stripped_line"
;;
*)
[ -n "$line" ] && continue
if [ -n "$ns" ] && [ -n "$search" ]; then
newns=
for n in $ns; do
newns="$newns${newns:+,}$n"
done
ds=
for d in $search; do
ds="$ds${ds:+ }$d:$newns"
done
echo "DOMAINS=\"\$DOMAINS $ds\""
fi
echo "SEARCH=\"\$SEARCH $search\""
if ! $private; then
echo "NAMESERVERS=\"\$NAMESERVERS $ns\""
fi
ns=
search=
new=true
;;
esac
done
}
uniqify()
{
result=
while [ -n "$1" ]; do
case " $result " in
*" $1 "*);;
*) result="$result $1";;
esac
shift
done
echo "${result# *}"
}
dirname()
{
OIFS="$IFS"
IFS=/
set -- $@
IFS="$OIFS"
if [ -n "$1" ]; then
printf %s .
else
shift
fi
while [ -n "$2" ]; do
printf "/%s" "$1"
shift
done
printf "\n"
}
config_mkdirs()
{
for f; do
[ -n "$f" ] || continue
d="$(dirname "$f")"
if [ ! -d "$d" ]; then
mkdir -p "$d" || return $?
fi
done
return 0
}
# With the advent of alternative init systems, it's possible to have
# more than one installed. So we need to try and guess what one we're
# using unless overridden by configure.
# Note that restarting a service is a last resort - the subscribers
# should make a reasonable attempt to reconfigure the service via some
# method, normally SIGHUP.
detect_init()
{
[ -n "$RESTARTCMD" ] && return 0
# Detect the running init system.
# As systemd and OpenRC can be installed on top of legacy init
# systems we try to detect them first.
status="@STATUSARG@"
: ${status:=status}
if [ -x /bin/systemctl ] && [ -S /run/systemd/private ]; then
RESTARTCMD='
if /bin/systemctl --quiet is-active $1.service
then
/bin/systemctl restart $1.service
fi'
elif [ -x /usr/bin/systemctl ] && [ -S /run/systemd/private ]; then
RESTARTCMD='
if /usr/bin/systemctl --quiet is-active $1.service
then
/usr/bin/systemctl restart $1.service
fi'
elif [ -x /sbin/rc-service ] &&
{ [ -s /libexec/rc/init.d/softlevel ] ||
[ -s /run/openrc/softlevel ]; }
then
RESTARTCMD='/sbin/rc-service -i $1 -- -Ds restart'
elif [ -x /usr/sbin/invoke-rc.d ]; then
RCDIR=/etc/init.d
RESTARTCMD='
if /usr/sbin/invoke-rc.d --quiet $1 status >/dev/null 2>&1
then
/usr/sbin/invoke-rc.d $1 restart
fi'
elif [ -x /usr/bin/s6-rc ] && [ -x /usr/bin/s6-svc ]; then
RESTARTCMD='
if s6-rc -a list 2>/dev/null | grep -qFx $1-srv
then
s6-svc -r /run/service/$1-srv
fi'
elif [ -x /sbin/service ]; then
# Old RedHat
RCDIR=/etc/init.d
RESTARTCMD='
if /sbin/service $1; then
/sbin/service $1 restart
fi'
elif [ -x /usr/sbin/service ]; then
# Could be FreeBSD
RESTARTCMD="
if /usr/sbin/service \$1 $status >/dev/null 2>&1
then
/usr/sbin/service \$1 restart
fi"
elif [ -x /bin/sv ]; then
RESTARTCMD='/bin/sv status $1 >/dev/null 2>&1 &&
/bin/sv try-restart $1'
elif [ -x /usr/bin/sv ]; then
RESTARTCMD='/usr/bin/sv status $1 >/dev/null 2>&1 &&
/usr/bin/sv try-restart $1'
elif [ -e /etc/arch-release ] && [ -d /etc/rc.d ]; then
RCDIR=/etc/rc.d
RESTARTCMD='
if [ -e /var/run/daemons/$1 ]
then
/etc/rc.d/$1 restart
fi'
elif [ -e /etc/slackware-version ] && [ -d /etc/rc.d ]; then
RESTARTCMD='
if /etc/rc.d/rc.$1 status >/dev/null 2>&1
then
/etc/rc.d/rc.$1 restart
fi'
elif [ -e /etc/rc.d/rc.subr ] && [ -d /etc/rc.d ]; then
# OpenBSD
RESTARTCMD='
if /etc/rc.d/$1 check >/dev/null 2>&1
then
/etc/rc.d/$1 restart
fi'
elif [ -d /etc/dinit.d ] && command -v dinitctl >/dev/null 2>&1; then
RESTARTCMD='dinitctl --quiet restart --ignore-unstarted $1'
else
for x in /etc/init.d/rc.d /etc/rc.d /etc/init.d; do
[ -d $x ] || continue
RESTARTCMD="
if $x/\$1 $status >/dev/null 2>&1
then
$x/\$1 restart
fi"
break
done
fi
if [ -z "$RESTARTCMD" ]; then
if [ "$_NOINIT_WARNED" != true ]; then
warn "could not detect a useable init system"
_NOINIT_WARNED=true
fi
return 1
fi
_NOINIT_WARNED=
return 0
}
echo_resolv()
{
OIFS="$IFS"
[ -n "$1" ] && [ -f "$IFACEDIR/$1" ] || return 1
echo "# resolv.conf from $1"
# Our variable maker works of the fact each resolv.conf per interface
# is separated by blank lines.
# So we remove them when echoing them.
while read -r line; do
IFS="$OIFS"
if [ -n "$line" ]; then
# We need to set IFS here to preserve any whitespace
IFS=''
printf "%s\n" "$line"
fi
done < "$IFACEDIR/$1"
IFS="$OIFS"
}
deprecated_interface()
{
[ -d "$DEPRECATEDDIR" ] || return 1
cd "$DEPRECATEDDIR"
for da; do
for daf in *; do
[ -f "$daf" ] || continue
case "$da" in
$daf) return 0;;
esac
done
done
return 1
}
match()
{
match="$1"
file="$2"
retval=1
count=0
while read -r keyword value; do
new_match=
for om in $match; do
m="$om"
keep=
while [ -n "$m" ]; do
k="${m%%/*}"
r="${m#*/}"
f="${r%%/*}"
r="${r#*/}"
# If the length of m is the same as k/f then
# we know that we are done
if [ ${#m} = $((${#k} + 1 + ${#f})) ]; then
r=
fi
m="$r"
matched=false
case "$keyword" in
$k)
case "$value" in
$f)
matched=true
;;
esac
;;
esac
if ! $matched; then
keep="$keep${keep:+/}$k/$f"
fi
done
if [ -n "$om" ] && [ -z "$keep" ]; then
retval=0
break 2
fi
new_match="${new_match}${new_match:+ }${keep}"
done
match="${new_match}"
done < "$file"
return $retval
}
list_resolv()
{
[ -d "$IFACEDIR" ] || return 0
list_cmd=
OPTIND=1
while getopts iLl OPT; do
case "$OPT" in
'?') exit 1;;
*) list_cmd="$OPT";;
esac
done
shift $(($OPTIND - 1))
pattern_specified="$1"
excl=false
list=
report=false
retval=0
case "$IF_EXCLUSIVE" in
[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
excl=true
if [ -d "$EXCLUSIVEDIR" ]; then
cd "$EXCLUSIVEDIR"
for i in *; do
if [ -f "$i" ]; then
list="${i#* }"
break
fi
done
fi
cd "$IFACEDIR"
for i in $inclusive_interfaces; do
if [ -f "$i" ] && [ "$list" = "$i" ]; then
list=
excl=false
break
fi
done
;;
esac
# If we have an interface ordering list, then use that.
# It works by just using pathname expansion in the interface directory.
if [ -n "$pattern_specified" ]; then
list="$*"
$force || report=true
elif ! $excl; then
cd "$IFACEDIR"
for i in $interface_order; do
[ -f "$i" ] && list="$list $i"
for ii in "$i":* "$i".*; do
[ -f "$ii" ] && list="$list $ii"
done
done
for i in $dynamic_order; do
if [ -e "$i" ] && ! [ -e "$METRICDIR/"*" $i" ]; then
list="$list $i"
fi
for ii in "$i":* "$i".*; do
if [ -f "$ii" ] && ! [ -e "$METRICDIR/"*" $ii" ]
then
list="$list $ii"
fi
done
done
# Interfaces have an implicit metric of 0 if not specified.
for i in *; do
if [ -f "$i" ] && ! [ -e "$METRICDIR/"*" $i" ]; then
list="$list $i"
fi
done
if [ -d "$METRICDIR" ]; then
cd "$METRICDIR"
for i in *; do
[ -f "$i" ] && list="$list ${i#* }"
done
fi
# Move deprecated interfaces to the back
active=
deprecated=
for i in $list; do
if deprecated_interface "$i"; then
deprecated="$deprecated $i"
else
active="$active $i"
fi
done
list="$active $deprecated"
fi
cd "$IFACEDIR"
if $excl || [ -n "$pattern_specified" ]; then
retval=1
else
retval=0
fi
for i in $(uniqify $list); do
# Only list interfaces which we really have
if ! [ -f "$i" ]; then
if $report; then
echo "No resolv.conf for interface $i" >&2
retval=2
fi
continue
fi
if [ "$list_cmd" = L ]; then
if [ -n "$allow_interfaces" ]; then
x=false
for j in $allow_interfaces; do
if [ "$i" = "$j" ]; then
x=true
fi
done
$x || continue
fi
for j in $deny_interfaces; do
if [ "$i" = "$j" ]; then
continue 2
fi
done
if [ -n "$exclude" ] && match "$exclude" "$i"; then
continue
fi
fi
if [ "$list_cmd" = i ]; then
printf %s "$i "
else
echo_resolv "$i" && echo
fi
[ $? = 0 ] && [ "$retval" = 1 ] && retval=0
done
[ "$list_cmd" = i ] && echo
return $retval
}
list_private()
{
IFACES=
for i in $(list_resolv -i $@ 2>/dev/null); do
if private_iface "$i"; then
IFACES="${IFACES}${IFACES:+ }$i"
fi
done
if [ -n "$IFACES" ]; then
echo "$IFACES"
fi
}
list_remove()
{
[ -z "$2" ] && return 0
eval list=\"\$$1\"
shift
result=
retval=0
set -f
for e; do
found=false
for l in $list; do
case "$e" in
$l) found=true;;
esac
$found && break
done
if $found; then
retval=$(($retval + 1))
else
result="$result $e"
fi
done
set +f
echo "${result# *}"
return $retval
}
echo_prepend()
{
echo "# Generated by resolvconf"
if [ -n "$search_domains" ]; then
echo "search $search_domains"
fi
for n in $name_servers; do
echo "nameserver $n"
done
echo
}
echo_append()
{
echo "# Generated by resolvconf"
if [ -n "$search_domains_append" ]; then
echo "search $search_domains_append"
fi
for n in $name_servers_append; do
echo "nameserver $n"
done
echo
}
replace()
{
while read -r keyword value; do
for r in $replace; do
k="${r%%/*}"
r="${r#*/}"
f="${r%%/*}"
r="${r#*/}"
v="${r%%/*}"
case "$keyword" in
$k)
case "$value" in
$f) value="$v";;
esac
;;
esac
done
val=
for sub in $value; do
for r in $replace_sub; do
k="${r%%/*}"
r="${r#*/}"
f="${r%%/*}"
r="${r#*/}"
v="${r%%/*}"
case "$keyword" in
$k)
case "$sub" in
$f) sub="$v";;
esac
;;
esac
done
val="$val${val:+ }$sub"
done
printf "%s %s\n" "$keyword" "$val"
done
}
make_vars()
{
# Clear variables
DOMAIN=
DOMAINS=
SEARCH=
NAMESERVERS=
LOCALNAMESERVERS=
if [ -n "${name_servers}${search_domains}" ]; then
eval "$(echo_prepend | parse_resolv)"
fi
if [ -z "$VFLAG" ]; then
IF_EXCLUSIVE=1
list_resolv -i "$@" >/dev/null || IF_EXCLUSIVE=0
eval "$(list_resolv -L "$@" | replace | parse_resolv)"
fi
if [ -n "${name_servers_append}${search_domains_append}" ]; then
eval "$(echo_append | parse_resolv)"
fi
# Ensure that we only list each domain once
newdomains=
for d in $DOMAINS; do
dn="${d%%:*}"
list_remove domain_blacklist "$dn" >/dev/null || continue
case " $newdomains" in
*" ${dn}:"*) continue;;
esac
newns=
for nd in $DOMAINS; do
if [ "$dn" = "${nd%%:*}" ]; then
ns="${nd#*:}"
while [ -n "$ns" ]; do
case ",$newns," in
*,${ns%%,*},*) ;;
*) list_remove name_server_blacklist \
"${ns%%,*}" >/dev/null \
&& newns="$newns${newns:+,}${ns%%,*}";;
esac
[ "$ns" = "${ns#*,}" ] && break
ns="${ns#*,}"
done
fi
done
if [ -n "$newns" ]; then
newdomains="$newdomains${newdomains:+ }$dn:$newns"
fi
done
DOMAIN="$(list_remove domain_blacklist $DOMAIN)"
SEARCH="$(uniqify $SEARCH)"
SEARCH="$(list_remove domain_blacklist $SEARCH)"
NAMESERVERS="$(uniqify $NAMESERVERS)"
NAMESERVERS="$(list_remove name_server_blacklist $NAMESERVERS)"
LOCALNAMESERVERS="$(uniqify $LOCALNAMESERVERS)"
LOCALNAMESERVERS="$(list_remove name_server_blacklist $LOCALNAMESERVERS)"
echo "DOMAIN='$DOMAIN'"
echo "SEARCH='$SEARCH'"
echo "NAMESERVERS='$NAMESERVERS'"
echo "LOCALNAMESERVERS='$LOCALNAMESERVERS'"
echo "DOMAINS='$newdomains'"
}
force=false
VFLAG=
while getopts a:C:c:Dd:fhIiLlm:pRruvVx OPT; do
case "$OPT" in
f) force=true;;
h) usage;;
m) IF_METRIC="$OPTARG";;
p) IF_PRIVATE=1;;
V)
VFLAG=1
if [ "$local_nameservers" = \
"127.* 0.0.0.0 255.255.255.255 ::1" ]
then
local_nameservers=
fi
;;
x) IF_EXCLUSIVE=1;;
'?') exit 1;;
*) cmd="$OPT"; iface="$OPTARG";;
esac
done
shift $(($OPTIND - 1))
args="$iface${iface:+ }$*"
if [ -z "$cmd" ] && [ "$IF_PRIVATE" = 1 ]; then
cmd=p
fi
# -I inits the state dir
if [ "$cmd" = I ]; then
if [ -d "$VARDIR" ]; then
rm -rf "$VARDIR"/*
fi
exit $?
fi
# -D ensures that the listed config file base dirs exist
if [ "$cmd" = D ]; then
config_mkdirs "$@"
exit $?
fi
# -l lists our resolv files, optionally for a specific interface
if [ "$cmd" = l ] || [ "$cmd" = i ]; then
list_resolv "-$cmd" "$args"
exit $?
fi
# -L is the same as -l, but post-processed from our config
if [ "$cmd" = L ]; then
list_resolv "-$cmd" "$args" | replace
exit $?
fi
if [ "$cmd" = p ]; then
list_private "$args"
exit $?
fi
# Restart a service or echo the command to restart a service
if [ "$cmd" = r ] || [ "$cmd" = R ]; then
detect_init || exit 1
if [ "$cmd" = r ]; then
set -- $args
eval "$RESTARTCMD"
else
echo "$RESTARTCMD" |
sed -e '/^$/d' -e 's/^ //g'
fi
exit $?
fi
# Not normally needed, but subscribers should be able to run independently
if [ "$cmd" = v ] || [ -n "$VFLAG" ]; then
make_vars "$iface"
exit $?
fi
# Test that we have valid options
case "$cmd" in
a|d|C|c)
if [ -z "$iface" ]; then
error_exit "Interface not specified"
fi
;;
u) ;;
*)
if [ -n "$cmd" ] && [ "$cmd" != h ]; then
error_exit "Unknown option $cmd"
fi
usage
;;
esac
if [ "$cmd" = a ]; then
for x in '/' \\ ' ' '*'; do
case "$iface" in
*[$x]*) error_exit "$x not allowed in interface name";;
esac
done
for x in '.' '-' '~'; do
case "$iface" in
[$x]*) error_exit \
"$x not allowed at start of interface name";;
esac
done
[ "$cmd" = a ] && [ -t 0 ] && error_exit "No file given via stdin"
fi
if [ ! -d "$VARDIR" ]; then
if [ -L "$VARDIR" ]; then
dir="$(readlink "$VARDIR")"
# link maybe relative
cd "${VARDIR%/*}"
if ! mkdir -m 0755 -p "$dir"; then
error_exit "Failed to create needed" \
"directory $dir"
fi
else
if ! mkdir -m 0755 -p "$VARDIR"; then
error_exit "Failed to create needed" \
"directory $VARDIR"
fi
fi
fi
if [ ! -d "$IFACEDIR" ]; then
mkdir -m 0755 -p "$IFACEDIR" || \
error_exit "Failed to create needed directory $IFACEDIR"
if [ "$cmd" = d ]; then
# Provide the same error messages as below
if ! ${force}; then
cd "$IFACEDIR"
for i in $args; do
warn "No resolv.conf for interface $i"
done
fi
${force}
exit $?
fi
fi
# An interface was added, changed, deleted or a general update was called.
# Due to exclusivity we need to ensure that this is an atomic operation.
# Our subscribers *may* need this as well if the init system is sub par.
# As such we spinlock at this point as best we can.
# We don't use flock(1) because it's not widely available and normally resides
# in /usr which we do our very best to operate without.
[ -w "$VARDIR" ] || error_exit "Cannot write to $LOCKDIR"
: ${lock_timeout:=10}
: ${clear_nopids:=5}
have_pid=false
had_pid=false
while true; do
if mkdir "$LOCKDIR" 2>/dev/null; then
trap 'rm -rf "$LOCKDIR";' EXIT
trap 'rm -rf "$LOCKDIR"; exit 1' INT QUIT ABRT SEGV ALRM TERM
echo $$ >"$LOCKDIR/pid"
break
fi
pid=$(cat "$LOCKDIR/pid" 2>/dev/null)
if [ "$pid" -gt 0 ] 2>/dev/null; then
have_pid=true
had_pid=true
else
have_pid=false
clear_nopids=$(($clear_nopids - 1))
if [ "$clear_nopids" -le 0 ]; then
warn "not seen a pid, clearing lock directory"
rm -rf "$LOCKDIR"
else
lock_timeout=$(($lock_timeout - 1))
sleep 1
fi
continue
fi
if $have_pid && ! kill -0 "$pid"; then
warn "clearing stale lock pid $pid"
rm -rf "$LOCKDIR"
continue