Mirror Freshness

#!/bin/bash # # Copyright (C) 2006 Brian Brazil # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA # # Check the freshness of a list of mirrors, producing a webpage and # a warning to stdout if some are stale. # Usage: checkmirrors mirrorinfo output_page # mirrorinfo has lines of the form: 'URL max_staleness_in_seconds' # The listed URLS should have as their first line a time in seconds # since the epoch if [ $# -ne 2 ] ; then echo "Usage: checkmirrors mirrorinfo output_page" exit 1 fi LOCKFILE="$2".lock if ! ln -s "$$.$HOSTNAME" "$LOCKFILE"; then echo "Error: lockfile '$LOCKFILE' exists" # exit 1 fi NOW=$(date +%s) NOW_PRETTY=$(date -R -d @$NOW) #Needs a newer version of date # Possible symlink attack here, make sure permissions are good cat < "$2.$$" Mirror Freshness

Mirror Freshness

EOF STALEMIRRORS=$(cat "$1" | while read LINE; do URL=${LINE% *} SLACK=${LINE#* } # Only get first line, and make sure there's only numbers LAST_UPDATED=$(GET "$URL"| head -1 | tr -dc 0-9) LAST_UPDATED_PRETTY=$(date -R -d @"0$NOW") DIFF=$(($NOW - $LAST_UPDATED)) if [ $DIFF -gt $SLACK ]; then STATUS="STALE" echo "Url: $URL Age: $DIFF" else STATUS="FRESH" fi # XSS here, but it's all script-owner provided data cat <> "$2.$$" EOF done) if [ -n "$STALEMIRRORS" ]; then cat <> "$2.$$"

URL	Last Updated	Status	Slack
$URL	$LAST_UPDATED_PRETTY ($LAST_UPDATED)	$STATUS ($DIFF seconds)	${SLACK}s

Script run started at $NOW_PRETTY ($NOW). Script run took $RUNTIME seconds.

EOF # Temporary file now good to go into place mv "$2.$$" "$2" rm "$LOCKFILE"