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Theodore Tso wrote:
> So ---- for someone who has time, I offer the following challenge.
> Take the above script, and enhance it in the following ways:
>
> * Read a configuration file to see which filesystem(s) to
> check and to which e-mail the error reports should be sent.
Add support for checking multiple FSes, too. :-)
> * Have the script abort the check if the system appears to be
> running off of a battery.
Sort of. Much of this on_ac_power function was stolen from Debian's
powermgmt_base package's on_ac_power script, but it doesn't support
anything other than ACPI. (It checks the new sysfs power_supply class
first, and the /proc/acpi/ac_adapter/ directory second.)
If the function can't determine if AC power is available, the script
assumes it's on battery, and exits; this is suboptimal for desktops, but
good for laptops that don't have ACPI turned on for whatever reason.
> * Have the config file define a time period (say, 30 days),
> and have the script test to see if the last_mount time is
> greater than the time interval. If it is, then it does the
> check, otherwise it skips it.
Well, this script looks at the last-check time, not the last-mount time.
But close enough.
> With these enhancements, in the laptop case the script could be fired
> off by cron every night at 3am, and if a month has gone by without a
> check, AND the laptop is running off the AC mains, the check happens
> automatically, in the background.
See the attached script (e2check) and sample config file (e2check.conf).
:-)
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#!/bin/sh
#
# e2check
function on_ac_power() {
local any_known=no
# try sysfs power class first
if [ -d /sys/class/power_supply ] ; then
for psu in /sys/class/power_supply/* ; do
if [ -r "${psu}/type" ] ; then
type="`cat "${psu}/type"`"
# ignore batteries
[ "${type}" = "Battery" ] && continue
online="`cat "${psu}/online"`"
[ "${online}" = 1 ] && return 0
[ "${online}" = 0 ] && any_known=yes
fi
done
[ "${any_known}" = "yes" ] && return 1
fi
# else fall back to AC adapters in /proc
if [ -d /proc/acpi/ac_adapter ] ; then
for ac in /proc/acpi/ac_adapter/* ; do
if [ -r "${ac}/state" ] ; then
grep -q on-line "${ac}/state" && return 0
grep -q off-line "${ac}/state" && any_known=yes
elif [ -r "${ac}/status" ] ; then
grep -q on-line "${ac}/status" && return 0
grep -q off-line "${ac}/status" && any_known=yes
fi
done
[ "${any_known}" = "yes" ] && return 1
fi
return 255
}
TMPFILE=`mktemp -t e2fsck.log.XXXXXXXXXX`
# be sure to delete the temp file
trap "rm $TMPFILE" EXIT
set -e
# pull in configuration -- don't bother with a parser, just use the shell's
. /etc/e2check.conf
# ensure VGS, VOLUMES, and SNAPSIZES have the same number of items
if [ "${#VGS[@]}" -ne "${#VOLUMES[@]}" ] || [ "${#VGS[@]}" -ne "${#SNAPSIZES[@]}" ] || \
[ "${#VGS[@]}" -ne "${#INTERVALS[@]}" ] ; then
echo "Error: Sizes of VGS, VOLUMES, SNAPSIZES, and INTERVALS arrays differ" >&2
exit 1
fi
# check whether the machine is on AC power: if not, skip the e2fsck
if on_ac_power ; then
for (( i=0; i<${#VGS[@]}; i+=1 )) ; do
VOLUME="${VOLUMES[$i]}"
VG="${VGS[$i]}"
SNAPSIZE="${SNAPSIZES[$i]}"
INTERVAL="${INTERVALS[$i]}"
# get the last check time plus $INTERVAL days
dumpe2fs -h "/dev/${VG}/${VOLUME}" | grep 'Last checked:' | \
sed -e 's/Last checked:[[:space:]]*//' | while read check_date ; do
check_day=`date --date="${check_date} $INTERVAL days" +"%Y%m%d"`
done
# get today's date
today=`date +"%Y%m%d"`
# skip LVs that don't need to be checked yet
[ "$check_day" -gt "$today" ] && continue
# clear the log file for each LV
> $TMPFILE
# use a different start time for each LV
START="$(date +'%Y%m%d%H%M%S')"
lvcreate -s -L ${SNAPSIZE} -n "${VOLUME}-snap" "${VG}/${VOLUME}"
if nice logsave -as $TMPFILE e2fsck -p -C 0 "/dev/${VG}/${VOLUME}-snap" && \
nice logsave -as $TMPFILE e2fsck -fy -C 0 "/dev/${VG}/${VOLUME}-snap" ; then
echo 'Background scrubbing succeeded!'
tune2fs -C 0 -T "${START}" "/dev/${VG}/${VOLUME}"
else
echo 'Background scrubbing failed! Reboot to fsck soon!'
tune2fs -C 16000 -T "19000101" "/dev/${VG}/${VOLUME}"
if test -n "$EMAIL"; then
mail -s "E2fsck of /dev/${VG}/${VOLUME} failed!" $EMAIL < $TMPFILE
fi
fi
lvremove -f "${VG}/${VOLUME}-snap"
done
fi
#!/bin/sh
# Configuration variables:
# EMAIL
# address to send failure notifications to (if empty,
# failure notifications will not be sent)
# VGS
# array of volume groups to check
# VOLUMES
# array of logical volumes to check, one for each
# volume group listed in VGS
# SNAPSIZES
# size of each LVM snapshot (any string accepted by
# the -L option to lvcreate is valid), one for each
# volume group listed in VGS
# INTERVALS
# days to wait between checks, one for each volume
# group listed in VGS
EMAIL='tytso@xxxxxxx'
VGS=(closure closure)
VOLUMES=(root home)
SNAPSIZES=(100m 100m)
INTERVALS=(30 30)
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