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rc.subr
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# $NetBSD: rc.subr,v 1.96 2014/10/07 19:09:45 roy Exp $
#
# Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Luke Mewburn.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
#
# rc.subr
# functions used by various rc scripts
#
: ${rcvar_manpage:='rc.conf(5)'}
: ${RC_PID:=$$} ; export RC_PID
nl='
' # a literal newline
#
# functions
# ---------
#
# checkyesno var
# Test $1 variable.
# Return 0 if it's "yes" (et al), 1 if it's "no" (et al), 2 otherwise.
#
checkyesnox()
{
eval _value=\$${1}
case $_value in
# "yes", "true", "on", or "1"
[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
return 0
;;
# "no", "false", "off", or "0"
[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0)
return 1
;;
*)
return 2
;;
esac
}
#
# checkyesno var
# Test $1 variable, and warn if not set to YES or NO.
# Return 0 if it's "yes" (et al), nonzero otherwise.
#
checkyesno()
{
local var
checkyesnox $1
var=$?
[ $var = 0 -o $var = 1 ] && return $var
warn "\$${1} is not set properly - see ${rcvar_manpage}."
return 1
}
#
# yesno_to_truefalse var
# Convert the value of a variable from any of the values
# understood by checkyesno() to "true" or "false".
#
yesno_to_truefalse()
{
local var=$1
if checkyesno $var; then
eval $var=true
return 0
else
eval $var=false
return 1
fi
}
#
# reverse_list list
# print the list in reverse order
#
reverse_list()
{
_revlist=
for _revfile; do
_revlist="$_revfile $_revlist"
done
echo $_revlist
}
#
# If booting directly to multiuser, send SIGTERM to
# the parent (/etc/rc) to abort the boot.
# Otherwise just exit.
#
stop_boot()
{
if [ "$autoboot" = yes ]; then
echo "ERROR: ABORTING BOOT (sending SIGTERM to parent)!"
kill -TERM ${RC_PID}
fi
exit 1
}
#
# mount_critical_filesystems type
# Go through the list of critical file systems as provided in
# the rc.conf(5) variable $critical_filesystems_${type}, checking
# each one to see if it is mounted, and if it is not, mounting it.
# It's not an error if file systems prefixed with "OPTIONAL:"
# are not mentioned in /etc/fstab.
#
mount_critical_filesystems()
{
eval _fslist=\$critical_filesystems_${1}
_mountcrit_es=0
for _fs in $_fslist; do
_optional=false
case "$_fs" in
OPTIONAL:*)
_optional=true
_fs="${_fs#*:}"
;;
esac
_ismounted=false
# look for a line like "${fs} on * type *"
# or "* on ${fs} type *" in the output from mount.
case "${nl}$( mount )${nl}" in
*" on ${_fs} type "*)
_ismounted=true
;;
*"${nl}${_fs} on "*)
_ismounted=true
;;
esac
if $_ismounted; then
print_rc_metadata \
"note:File system ${_fs} was already mounted"
else
_mount_output=$( mount $_fs 2>&1 )
_mount_es=$?
case "$_mount_output" in
*"${nl}"*)
# multiple lines can't be good,
# not even if $_optional is true
;;
*[uU]'nknown special file or file system'*)
if $_optional; then
# ignore this error
print_rc_metadata \
"note:Optional file system ${_fs} is not present"
_mount_es=0
_mount_output=""
fi
;;
esac
if [ -n "$_mount_output" ]; then
printf >&2 "%s\n" "$_mount_output"
fi
if [ "$_mount_es" != 0 ]; then
_mountcrit_es="$_mount_es"
fi
fi
done
return $_mountcrit_es
}
#
# check_pidfile pidfile procname [interpreter]
# Parses the first line of pidfile for a PID, and ensures
# that the process is running and matches procname.
# Prints the matching PID upon success, nothing otherwise.
# interpreter is optional; see _find_processes() for details.
#
check_pidfile()
{
_pidfile=$1
_procname=$2
_interpreter=$3
if [ -z "$_pidfile" -o -z "$_procname" ]; then
err 3 'USAGE: check_pidfile pidfile procname [interpreter]'
fi
if [ ! -f $_pidfile ]; then
return
fi
read _pid _junk < $_pidfile
if [ -z "$_pid" ]; then
return
fi
_find_processes $_procname ${_interpreter:-.} '-p '"$_pid"
}
#
# check_process procname [interpreter]
# Ensures that a process (or processes) named procname is running.
# Prints a list of matching PIDs.
# interpreter is optional; see _find_processes() for details.
#
check_process()
{
_procname=$1
_interpreter=$2
if [ -z "$_procname" ]; then
err 3 'USAGE: check_process procname [interpreter]'
fi
_find_processes $_procname ${_interpreter:-.} '-ax'
}
#
# _find_processes procname interpreter psargs
# Search for procname in the output of ps generated by psargs.
# Prints the PIDs of any matching processes, space separated.
#
# If interpreter == ".", check the following variations of procname
# against the first word of each command:
# procname
# `basename procname`
# `basename procname` + ":"
# "(" + `basename procname` + ")"
#
# If interpreter != ".", read the first line of procname, remove the
# leading #!, normalise whitespace, append procname, and attempt to
# match that against each command, either as is, or with extra words
# at the end. As an alternative, to deal with interpreted daemons
# using perl, the basename of the interpreter plus a colon is also
# tried as the prefix to procname.
#
_find_processes()
{
if [ $# -ne 3 ]; then
err 3 'USAGE: _find_processes procname interpreter psargs'
fi
_procname=$1
_interpreter=$2
_psargs=$3
_pref=
_procnamebn=${_procname##*/}
if [ $_interpreter != "." ]; then # an interpreted script
read _interp < ${_chroot:-}/$_procname # read interpreter name
_interp=${_interp#\#!} # strip #!
set -- $_interp
if [ $1 = "/usr/bin/env" ]; then
shift
set -- $(type $1)
shift $(($# - 1))
_interp="${1##*/} $_procname"
else
_interp="$* $_procname"
fi
if [ $_interpreter != $1 ]; then
warn "\$command_interpreter $_interpreter != $1"
fi
_interpbn=${1##*/}
_fp_args='_argv'
_fp_match='case "$_argv" in
${_interp}|"${_interp} "*|"${_interpbn}: "*${_procnamebn}*)'
else # a normal daemon
_fp_args='_arg0 _argv'
_fp_match='case "$_arg0" in
$_procname|$_procnamebn|${_procnamebn}:|"(${_procnamebn})")'
fi
_proccheck='
ps -o "pid,command" '"$_psargs"' |
while read _npid '"$_fp_args"'; do
case "$_npid" in
PID)
continue ;;
esac ; '"$_fp_match"'
echo -n "$_pref$_npid" ;
_pref=" "
;;
esac
done'
#echo 1>&2 "proccheck is :$_proccheck:"
eval $_proccheck
}
#
# wait_for_pids pid [pid ...]
# spins until none of the pids exist
#
wait_for_pids()
{
_list="$@"
if [ -z "$_list" ]; then
return
fi
_prefix=
while true; do
_nlist="";
for _j in $_list; do
if kill -0 $_j 2>/dev/null; then
_nlist="${_nlist}${_nlist:+ }$_j"
fi
done
if [ -z "$_nlist" ]; then
break
fi
if [ "$_list" != "$_nlist" ]; then
_list=$_nlist
echo -n ${_prefix:-"Waiting for PIDS: "}$_list
_prefix=", "
fi
# We want this to be a tight loop for a fast exit
sleep 0.05
done
if [ -n "$_prefix" ]; then
echo "."
fi
}
#
# run_rc_command argument [parameters]
# Search for argument in the list of supported commands, which is:
# "start stop restart rcvar status poll ${extra_commands}"
# If there's a match, run ${argument}_cmd or the default method
# (see below), and pass the optional list of parameters to it.
#
# If argument has a given prefix, then change the operation as follows:
# Prefix Operation
# ------ ---------
# fast Skip the pid check, and set rc_fast=yes
# force Set ${rcvar} to YES, and set rc_force=yes
# one Set ${rcvar} to YES
#
# The following globals are used:
#
# Name Needed Purpose
# ---- ------ -------
# name y Name of script.
#
# command n Full path to command.
# Not needed if ${rc_arg}_cmd is set for
# each keyword.
#
# command_args n Optional args/shell directives for command.
#
# command_interpreter n If not empty, command is interpreted, so
# call check_{pidfile,process}() appropriately.
#
# extra_commands n List of extra commands supported.
#
# pidfile n If set, use check_pidfile $pidfile $command,
# otherwise use check_process $command.
# In either case, only check if $command is set.
#
# procname n Process name to check for instead of $command.
#
# rcvar n This is checked with checkyesno to determine
# if the action should be run.
#
# ${name}_chroot n Directory to chroot to before running ${command}
# Requires /usr to be mounted.
#
# ${name}_chdir n Directory to cd to before running ${command}
# (if not using ${name}_chroot).
#
# ${name}_flags n Arguments to call ${command} with.
# NOTE: $flags from the parent environment
# can be used to override this.
#
# ${name}_env n Additional environment variable settings
# for running ${command}
#
# ${name}_nice n Nice level to run ${command} at.
#
# ${name}_user n User to run ${command} as, using su(1) if not
# using ${name}_chroot.
# Requires /usr to be mounted.
#
# ${name}_group n Group to run chrooted ${command} as.
# Requires /usr to be mounted.
#
# ${name}_groups n Comma separated list of supplementary groups
# to run the chrooted ${command} with.
# Requires /usr to be mounted.
#
# ${rc_arg}_cmd n If set, use this as the method when invoked;
# Otherwise, use default command (see below)
#
# ${rc_arg}_precmd n If set, run just before performing the
# ${rc_arg}_cmd method in the default
# operation (i.e, after checking for required
# bits and process (non)existence).
# If this completes with a non-zero exit code,
# don't run ${rc_arg}_cmd.
#
# ${rc_arg}_postcmd n If set, run just after performing the
# ${rc_arg}_cmd method, if that method
# returned a zero exit code.
#
# required_dirs n If set, check for the existence of the given
# directories before running the default
# (re)start command.
#
# required_files n If set, check for the readability of the given
# files before running the default (re)start
# command.
#
# required_vars n If set, perform checkyesno on each of the
# listed variables before running the default
# (re)start command.
#
# Default behaviour for a given argument, if no override method is
# provided:
#
# Argument Default behaviour
# -------- -----------------
# start if !running && checkyesno ${rcvar}
# ${command}
#
# stop if ${pidfile}
# rc_pid=$(check_pidfile $pidfile $command)
# else
# rc_pid=$(check_process $command)
# kill $sig_stop $rc_pid
# wait_for_pids $rc_pid
# ($sig_stop defaults to TERM.)
#
# reload Similar to stop, except use $sig_reload instead,
# and doesn't wait_for_pids.
# $sig_reload defaults to HUP.
#
# restart Run `stop' then `start'.
#
# status Show if ${command} is running, etc.
#
# poll Wait for ${command} to exit.
#
# rcvar Display what rc.conf variable is used (if any).
#
# Variables available to methods, and after run_rc_command() has
# completed:
#
# Variable Purpose
# -------- -------
# rc_arg Argument to command, after fast/force/one processing
# performed
#
# rc_flags Flags to start the default command with.
# Defaults to ${name}_flags, unless overridden
# by $flags from the environment.
# This variable may be changed by the precmd method.
#
# rc_pid PID of command (if appropriate)
#
# rc_fast Not empty if "fast" was provided (q.v.)
#
# rc_force Not empty if "force" was provided (q.v.)
#
#
run_rc_command()
{
rc_arg=$1
if [ -z "$name" ]; then
err 3 'run_rc_command: $name is not set.'
fi
_rc_prefix=
case "$rc_arg" in
fast*) # "fast" prefix; don't check pid
rc_arg=${rc_arg#fast}
rc_fast=yes
;;
force*) # "force" prefix; always run
rc_force=yes
_rc_prefix=force
rc_arg=${rc_arg#${_rc_prefix}}
if [ -n "${rcvar}" ]; then
eval ${rcvar}=YES
fi
;;
one*) # "one" prefix; set ${rcvar}=yes
_rc_prefix=one
rc_arg=${rc_arg#${_rc_prefix}}
if [ -n "${rcvar}" ]; then
eval ${rcvar}=YES
fi
;;
esac
_keywords="start stop restart rcvar"
if [ -n "$extra_commands" ]; then
_keywords="${_keywords} ${extra_commands}"
fi
rc_pid=
_pidcmd=
_procname=${procname:-${command}}
# setup pid check command if not fast
if [ -z "$rc_fast" -a -n "$_procname" ]; then
if [ -n "$pidfile" ]; then
_pidcmd='rc_pid=$(check_pidfile '"$pidfile $_procname $command_interpreter"')'
else
_pidcmd='rc_pid=$(check_process '"$_procname $command_interpreter"')'
fi
if [ -n "$_pidcmd" ]; then
_keywords="${_keywords} status poll"
fi
fi
if [ -z "$rc_arg" ]; then
rc_usage "$_keywords"
fi
shift # remove $rc_arg from the positional parameters
if [ -n "$flags" ]; then # allow override from environment
rc_flags=$flags
else
eval rc_flags=\$${name}_flags
fi
eval _chdir=\$${name}_chdir _chroot=\$${name}_chroot \
_nice=\$${name}_nice _user=\$${name}_user \
_group=\$${name}_group _groups=\$${name}_groups \
_env=\"\$${name}_env\"
if [ -n "$_user" ]; then # unset $_user if running as that user
if [ "$_user" = "$(id -un)" ]; then
unset _user
fi
fi
# if ${rcvar} is set, and $1 is not
# "rcvar", then run
# checkyesno ${rcvar}
# and return if that failed or warn
# user and exit when interactive
#
if [ -n "${rcvar}" -a "$rc_arg" != "rcvar" ]; then
if ! checkyesno ${rcvar}; then
# check whether interactive or not
if [ -n "$_run_rc_script" ]; then
return 0
fi
for _elem in $_keywords; do
if [ "$_elem" = "$rc_arg" ]; then
cat 1>&2 <<EOF
\$${rcvar} is not enabled - see ${rcvar_manpage}.
Use the following if you wish to perform the operation:
$0 one${rc_arg}
EOF
exit 1
fi
done
echo 1>&2 "$0: unknown directive '$rc_arg'."
rc_usage "$_keywords"
fi
fi
eval $_pidcmd # determine the pid if necessary
for _elem in $_keywords; do
if [ "$_elem" != "$rc_arg" ]; then
continue
fi
# if there's a custom ${XXX_cmd},
# run that instead of the default
#
eval _cmd=\$${rc_arg}_cmd _precmd=\$${rc_arg}_precmd \
_postcmd=\$${rc_arg}_postcmd
if [ -n "$_cmd" ]; then
# if the precmd failed and force
# isn't set, exit
#
if ! eval $_precmd && [ -z "$rc_force" ]; then
return 1
fi
if ! eval $_cmd \"\${@}\" && [ -z "$rc_force" ]; then
return 1
fi
eval $_postcmd
return 0
fi
if [ ${#} -gt 0 ]; then
err 1 "the $rc_arg command does not take any parameters"
fi
case "$rc_arg" in # default operations...
status)
if [ -n "$rc_pid" ]; then
echo "${name} is running as pid $rc_pid."
else
echo "${name} is not running."
return 1
fi
;;
start)
if [ -n "$rc_pid" ]; then
echo 1>&2 "${name} already running? (pid=$rc_pid)."
exit 1
fi
if [ ! -x ${_chroot}${command} ]; then
return 0
fi
# check for required variables,
# directories, and files
#
for _f in $required_vars; do
if ! checkyesno $_f; then
warn "\$${_f} is not enabled."
if [ -z "$rc_force" ]; then
return 1
fi
fi
done
for _f in $required_dirs; do
if [ ! -d "${_f}/." ]; then
warn "${_f} is not a directory."
if [ -z "$rc_force" ]; then
return 1
fi
fi
done
for _f in $required_files; do
if [ ! -r "${_f}" ]; then
warn "${_f} is not readable."
if [ -z "$rc_force" ]; then
return 1
fi
fi
done
# if the precmd failed and force
# isn't set, exit
#
if ! eval $_precmd && [ -z "$rc_force" ]; then
return 1
fi
# setup the command to run, and run it
#
echo "Starting ${name}."
if [ -n "$_chroot" ]; then
_doit="\
${_env:+env $_env }\
${_nice:+nice -n $_nice }\
chroot ${_user:+-u $_user }${_group:+-g $_group }${_groups:+-G $_groups }\
$_chroot $command $rc_flags $command_args"
else
_doit="\
${_chdir:+cd $_chdir; }\
${_env:+env $_env }\
${_nice:+nice -n $_nice }\
$command $rc_flags $command_args"
if [ -n "$_user" ]; then
_doit="su -m $_user -c 'sh -c \"$_doit\"'"
fi
fi
# if the cmd failed and force
# isn't set, exit
#
if ! eval $_doit && [ -z "$rc_force" ]; then
return 1
fi
# finally, run postcmd
#
eval $_postcmd
;;
stop)
if [ -z "$rc_pid" ]; then
if [ -n "$pidfile" ]; then
echo 1>&2 \
"${name} not running? (check $pidfile)."
else
echo 1>&2 "${name} not running?"
fi
exit 1
fi
# if the precmd failed and force
# isn't set, exit
#
if ! eval $_precmd && [ -z "$rc_force" ]; then
return 1
fi
# send the signal to stop
#
echo "Stopping ${name}."
_doit="kill -${sig_stop:-TERM} $rc_pid"
if [ -n "$_user" ]; then
_doit="su -m $_user -c 'sh -c \"$_doit\"'"
fi
# if the stop cmd failed and force
# isn't set, exit
#
if ! eval $_doit && [ -z "$rc_force" ]; then
return 1
fi
# wait for the command to exit,
# and run postcmd.
wait_for_pids $rc_pid
eval $_postcmd
;;
reload)
if [ -z "$rc_pid" ]; then
if [ -n "$pidfile" ]; then
echo 1>&2 \
"${name} not running? (check $pidfile)."
else
echo 1>&2 "${name} not running?"
fi
exit 1
fi
echo "Reloading ${name} config files."
if ! eval $_precmd && [ -z "$rc_force" ]; then
return 1
fi
_doit="kill -${sig_reload:-HUP} $rc_pid"
if [ -n "$_user" ]; then
_doit="su -m $_user -c 'sh -c \"$_doit\"'"
fi
if ! eval $_doit && [ -z "$rc_force" ]; then
return 1
fi
eval $_postcmd
;;
restart)
if ! eval $_precmd && [ -z "$rc_force" ]; then
return 1
fi
# prevent restart being called more
# than once by any given script
#
if ${_rc_restart_done:-false}; then
return 0
fi
_rc_restart_done=true
( $0 ${_rc_prefix}stop )
$0 ${_rc_prefix}start
eval $_postcmd
;;
poll)
if [ -n "$rc_pid" ]; then
wait_for_pids $rc_pid
fi
;;
rcvar)
echo "# $name"
if [ -n "$rcvar" ]; then
if checkyesno ${rcvar}; then
echo "\$${rcvar}=YES"
else
echo "\$${rcvar}=NO"
fi
fi
;;
*)
rc_usage "$_keywords"
;;
esac
return 0
done
echo 1>&2 "$0: unknown directive '$rc_arg'."
rc_usage "$_keywords"
exit 1
}
#
# _have_rc_postprocessor
# Test whether the current script is running in a context that
# was invoked from /etc/rc with a postprocessor.
#
# If the test fails, some variables may be unset to make
# such tests more efficient in future.
#
_have_rc_postprocessor()
{
# Cheap tests that fd and pid are set, fd is writable.
[ -n "${_rc_postprocessor_fd}" ] || return 1
[ -n "${_rc_pid}" ] || return 1
eval ": >&${_rc_postprocessor_fd}" 2>/dev/null || return 1
# More expensive test that pid is running.
# Unset _rc_pid if this fails.
kill -0 "${_rc_pid}" 2>/dev/null \
|| { unset _rc_pid; return 1; }
# More expensive test that pid appears to be
# a shell running an rc script.
# Unset _rc_pid if this fails.
expr "$(ps -p "${_rc_pid}" -o command=)" : ".*sh .*/rc.*" >/dev/null \
|| { unset _rc_pid; return 1; }
return 0
}
#
# run_rc_script file arg
# Start the script `file' with `arg', and correctly handle the
# return value from the script. If `file' ends with `.sh', it's
# sourced into the current environment. If `file' appears to be
# a backup or scratch file, ignore it. Otherwise if it's
# executable run as a child process.
#
# If `file' contains "KEYWORD: interactive" and if we are
# running inside /etc/rc with postprocessing, then the script's
# stdout and stderr are redirected to $_rc_original_stdout_fd and
# $_rc_original_stderr_fd, so the output will be displayed on the
# console but not intercepted by /etc/rc's postprocessor.
#
run_rc_script()
{
_file=$1
_arg=$2
if [ -z "$_file" -o -z "$_arg" ]; then
err 3 'USAGE: run_rc_script file arg'
fi
_run_rc_script=true
unset name command command_args command_interpreter \
extra_commands pidfile procname \
rcvar required_dirs required_files required_vars
eval unset ${_arg}_cmd ${_arg}_precmd ${_arg}_postcmd
_must_redirect=false
if _have_rc_postprocessor \
&& _has_rcorder_keyword interactive $_file
then
_must_redirect=true
fi
case "$_file" in
*.sh) # run in current shell
if $_must_redirect; then
print_rc_metadata \
"note:Output from ${_file} is not logged"
no_rc_postprocess eval \
'set $_arg ; . $_file'
else
set $_arg ; . $_file
fi
;;
*[~#]|*.OLD|*.orig|*,v) # scratch file; skip
warn "Ignoring scratch file $_file"
;;
*) # run in subshell
if [ -x $_file ] && $_must_redirect; then
print_rc_metadata \
"note:Output from ${_file} is not logged"
if [ -n "$rc_fast_and_loose" ]; then
no_rc_postprocess eval \
'set $_arg ; . $_file'
else
no_rc_postprocess eval \
'( set $_arg ; . $_file )'
fi
elif [ -x $_file ]; then
if [ -n "$rc_fast_and_loose" ]; then
set $_arg ; . $_file
else
( set $_arg ; . $_file )
fi
else
warn "Ignoring non-executable file $_file"
fi
;;
esac
}
#
# load_rc_config command
# Source in the configuration file for a given command.
#
load_rc_config()
{
_command=$1
if [ -z "$_command" ]; then
err 3 'USAGE: load_rc_config command'
fi
if ${_rc_conf_loaded:-false}; then
:
else
. /etc/rc.conf
_rc_conf_loaded=true
fi
if [ -f /etc/rc.conf.d/"$_command" ]; then
. /etc/rc.conf.d/"$_command"
fi
}
#
# load_rc_config_var cmd var
# Read the rc.conf(5) var for cmd and set in the
# current shell, using load_rc_config in a subshell to prevent
# unwanted side effects from other variable assignments.
#
load_rc_config_var()
{
if [ $# -ne 2 ]; then
err 3 'USAGE: load_rc_config_var cmd var'
fi
eval $(eval '(
load_rc_config '$1' >/dev/null;
if [ -n "${'$2'}" -o "${'$2'-UNSET}" != "UNSET" ]; then
echo '$2'=\'\''${'$2'}\'\'';
fi
)' )
}
#
# rc_usage commands
# Print a usage string for $0, with `commands' being a list of
# valid commands.
#
rc_usage()
{
echo -n 1>&2 "Usage: $0 [fast|force|one]("
_sep=
for _elem; do
echo -n 1>&2 "$_sep$_elem"
_sep="|"
done
echo 1>&2 ")"
exit 1
}
#
# err exitval message
# Display message to stderr and log to the syslog, and exit with exitval.
#
err()
{
exitval=$1
shift
if [ -x /usr/bin/logger ]; then
logger "$0: ERROR: $*"
fi
echo 1>&2 "$0: ERROR: $*"
exit $exitval
}
#
# warn message
# Display message to stderr and log to the syslog.
#
warn()
{
if [ -x /usr/bin/logger ]; then
logger "$0: WARNING: $*"
fi
echo 1>&2 "$0: WARNING: $*"
}
#
# backup_file action file cur backup
# Make a backup copy of `file' into `cur', and save the previous
# version of `cur' as `backup' or use rcs for archiving.
#