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#!/bin/sh
#
# A custom apccontrol for use in embedded systems: just make sure there's no
# data in-flight and wait for the blackout to shut us down.
# these filesystems are not relevant
IGNORE_FS="tmpfs proc sysfs devtmpfs devpts nfsd"
get_rw_mounts() {
local excl='\((ro,\|type \('
local sep=""
for fs in $IGNORE_FS; do
excl+="${sep}$fs"
sep='\|'
done
excl+='\)\)'
mount | grep -v "$excl" | while read dev on mnt opts; do
echo "$mnt"
done
}
log() {
logger -s -t "$(basename $0)" -p daemon.crit "$*"
}
__mount() { # (ro/rw, txt, mnt)
local opt=$1
local txt=$2
local mnt="$3"
mount -o remount,$opt "$mnt"
rc=$?
case $rc in
0) log "remounted $mnt $txt"
*) log "failed to remount $mnt $txt: rc=$rc"
esac
return $rc
}
mount_ro() {
__mount ro read-only "$1"
}
mount_rw() {
__mount rw read-write "$1"
}
romounts="/tmp/apcupsd.romounts"
case "$1" in
emergency|failing)
log "UPS error condition happening"
;& # fall through
doshutdown)
log "bracing for upcoming blackout"
rm -f "$romounts"
sync
get_rw_mounts | while read mnt; do
mount_ro "$mnt" && echo "$mnt" >>"$romounts"
done
;;
mainsback)
log "returning to routine after near blackout"
touch "$romounts"
while read mnt; do
mount_rw "$mnt"
done <"$romounts"
rm "$romounts"
;;
*)
log "Called for $1"
;;
esac
exit 0
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