mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-18 10:35:55 +00:00
86571b9c01
Multiple periodic scripts sleep for a random amount of time in order to mitigate the thundering herd problem. This is bad, because the sum of multiple uniformly distributed random variables approaches a normal distribution, so the problem isn't mitigated as effectively as it would be with a single sleep. This change creates a single configurable anticongestion sleep. periodic will only sleep if at least one script requires it, and it will never sleep more than once per invocation. It also won't sleep if periodic was run interactively, fixing an unrelated longstanding bug. PR: 217055 PR: 210188 Reviewed by: cy MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D10211
151 lines
4.0 KiB
Bash
151 lines
4.0 KiB
Bash
#!/bin/sh -
|
|
#
|
|
# $FreeBSD$
|
|
#
|
|
# Run nightly periodic scripts
|
|
#
|
|
# usage: periodic { daily | weekly | monthly | security } - run standard scripts
|
|
# periodic /absolute/path/to/directory - run periodic scripts in dir
|
|
#
|
|
|
|
usage () {
|
|
echo "usage: $0 <directory of files to execute>" 1>&2
|
|
echo "or $0 { daily | weekly | monthly | security }" 1>&2
|
|
exit 1
|
|
}
|
|
|
|
output_pipe()
|
|
{
|
|
# Where's our output going ?
|
|
eval output=\$${1##*/}_output
|
|
case "$output" in
|
|
/*) pipe="cat >>$output";;
|
|
"") pipe=cat;;
|
|
*) pipe="mail -E -s '$host ${2}${2:+ }${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 $arg "$PERIODIC"
|
|
ret=1
|
|
;;
|
|
75) #EX_TEMPFAIL
|
|
echo "$host ${arg##*/} prior run still in progress" | \
|
|
output_pipe $arg "$PERIODIC"
|
|
ret=1
|
|
;;
|
|
*)
|
|
ret=1
|
|
;;
|
|
esac
|
|
done
|
|
exit $ret
|
|
fi
|
|
|
|
if [ $# -ne 2 ]; then
|
|
usage
|
|
fi
|
|
shift
|
|
arg=$1
|
|
|
|
if [ -z "$PERIODIC_ANTICONGESTION_FILE" ] ; then
|
|
export PERIODIC_ANTICONGESTION_FILE=`mktemp ${TMPDIR:-/tmp}/periodic.anticongestion.XXXXXXXXXX`
|
|
fi
|
|
if tty > /dev/null 2>&1; then
|
|
export PERIODIC_IS_INTERACTIVE=1
|
|
fi
|
|
tmp_output=`mktemp ${TMPDIR:-/tmp}/periodic.XXXXXXXXXX`
|
|
context="$PERIODIC"
|
|
export PERIODIC="$arg${PERIODIC:+ }${PERIODIC}"
|
|
|
|
# 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 $arg "$context"
|
|
|
|
rm -f $tmp_output
|
|
rm -f $PERIODIC_ANTICONGESTION_FILE
|