freebsd-src/usr.sbin/periodic/periodic.sh
Brooks Davis df01f319c7 Prevent periodic scripts that run longer than the expected period from
starting up before the previous script finishes.  This prevents an
infinite number of them from piling up and slowing a system down.

Since all the refactoring to make this happen required churning the
indenting of most of this file, make the indentation more consistent.

Reviewed by:	simon
MFC after:	1 week
2012-02-12 23:18:05 +00:00

141 lines
3.6 KiB
Bash

#!/bin/sh -
#
# $FreeBSD$
#
# Run nightly periodic scripts
#
# usage: periodic { daily | weekly | monthly } - run standard periodic scripts
# periodic /absolute/path/to/directory - run periodic scripts in dir
#
usage () {
echo "usage: $0 <directory of files to execute>" 1>&2
echo "or $0 { daily | weekly | monthly }" 1>&2
exit 1
}
output_pipe()
{
# Where's our output going ?
eval output=\$${1##*/}_output
case "$output" in
/*) pipe="cat >>$output";;
"") pipe=cat;;
*) pipe="mail -E -s '$host ${1##*/} run output' $output";;
esac
eval $pipe
}
if [ $# -lt 1 ] ; then
usage
fi
# If possible, check the global system configuration file,
# to see if there are additional dirs to check
if [ -r /etc/defaults/periodic.conf ]; then
. /etc/defaults/periodic.conf
source_periodic_confs
fi
host=`hostname`
export host
# If we were called normally, then create a lock file for each argument
# in turn and reinvoke ourselves with the LOCKED argument. This prevents
# very long running jobs from being overlapped by another run as this is
# will lead the system running progressivly slower and more and more jobs
# are run at once.
if [ $1 != "LOCKED" ]; then
ret=0
for arg; do
lockfile=/var/run/periodic.${arg##*/}.lock
lockf -t 0 "${lockfile}" /bin/sh $0 LOCKED "$arg"
case $? in
0) ;;
73) #EX_CANTCREATE
echo "can't create ${lockfile}" | output_pipe $arg
ret=1
;;
75) #EX_TEMPFAIL
echo "$host ${arg##*/} prior run still in progress" | \
output_pipe $arg
ret=1
;;
*)
ret=1
;;
esac
done
exit $ret
fi
if [ $# -ne 2 ]; then
usage
fi
shift
arg=$1
tmp_output=`mktemp ${TMPDIR:-/tmp}/periodic.XXXXXXXXXX`
# Execute each executable file in the directory list. If the x bit is not
# set, assume the user didn't really want us to muck with it (it's a
# README file or has been disabled).
success=YES info=YES badconfig=NO empty_output=YES # Defaults when ${run}_* aren't YES/NO
for var in success info badconfig empty_output; do
case $(eval echo "\$${arg##*/}_show_$var") in
[Yy][Ee][Ss]) eval $var=YES;;
[Nn][Oo]) eval $var=NO;;
esac
done
case $arg in
/*) if [ -d "$arg" ]; then
dirlist="$arg"
else
echo "$0: $arg not found" >&2
continue
fi
;;
*) dirlist=
for top in /etc/periodic ${local_periodic}; do
[ -d $top/$arg ] && dirlist="$dirlist $top/$arg"
done
;;
esac
{
empty=TRUE
processed=0
for dir in $dirlist; do
for file in $dir/*; do
if [ -x $file -a ! -d $file ]; then
output=TRUE
processed=$(($processed + 1))
$file </dev/null >$tmp_output 2>&1
rc=$?
if [ -s $tmp_output ]; then
case $rc in
0) [ $success = NO ] && output=FALSE;;
1) [ $info = NO ] && output=FALSE;;
2) [ $badconfig = NO ] && output=FALSE;;
esac
[ $output = TRUE ] && { cat $tmp_output; empty=FALSE; }
fi
cp /dev/null $tmp_output
fi
done
done
if [ $empty = TRUE ]; then
if [ $empty_output = TRUE ]; then
[ $processed = 1 ] && plural= || plural=s
echo "No output from the $processed file$plural processed"
fi
else
echo ""
echo "-- End of $arg output --"
fi
} | output_pipe ${arg}
rm -f $tmp_output