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#!/bin/sh
#
# Automatic database upgrade for MkS_Vir for Linux
# version 0.12
# (c) Bartlomiej Korupczynski '2002
# bartek@net-serwis.pl
# http://www.nzs.pw.edu.pl/~bkorupcz/
#
# GPL license
#
# config
SUBDIR=bazy4
MKS_URL="http://download.mks.com.pl/download/linux/$SUBDIR.tgz"
MKS_PATH="/var/lib/mks"
HUP=mksd
LOGPRIO=daemon.info
LOGTAG="mksvir-update"
REMOVE=0
# TMPDIR will be DELETED!
TMPDIR="$MKS_PATH/tmp"
FLOCK="$MKS_PATH/update.lock"
LAST="$MKS_PATH/update.last"
TIMESTAMP="$MKS_PATH/current"
# startup
PATH=/bin:/usr/bin
export TMPDIR
[ "$1" == "debug" ] && DEBUG=1 && echo "Debugging enabled"
if [ -z "$MKS_URL" -o -z "$MKS_PATH" -o -z "$TMPDIR" -o -z "$FLOCK" -o -z "$LAST" -o -z "$TIMESTAMP" ]; then
echo "empty variables. quitting."
exit 10
fi
if [ -f "$FLOCK" ]; then
echo "Lockfile $FLOCK present. quitting."
exit 11
fi
touch "$FLOCK" || exit 15
[ -n "$DEBUG" ] && echo "Setting traps"
trap "rm -f \"$FLOCK\"" INT
trap "rm -f \"$FLOCK\"" TERM
trap "rm -f \"$FLOCK\"" QUIT
trap "rm -f \"$FLOCK\"" HUP
# pre
[ -n "$DEBUG" ] && echo "Setting variables"
cd "$MKS_PATH"
FNAME="${MKS_URL##*/}"
[ -f "$LAST" -a -w "$LAST" ] || touch "$LAST" || exit 15
rm -rf "$TMPDIR"
mkdir -m 0700 -p "$TMPDIR"
# remote file timestamp check
[ -n "$DEBUG" ] && echo "Retrieving timestamp"
wget -q -nd "$MKS_URL" -O "$FNAME.link"
wget -S --spider -i "$FNAME.link" 2>&1 | grep Last-Modified | cut -d' ' -f3- >"$TIMESTAMP"
ret=$?
if [ $ret != 0 ]; then
rm -f "$FLOCK"
echo "problem with timestamp check. quitting."
exit 12
fi
[ -n "$DEBUG" ] && echo "Comparing timestamp"
cmp -s "$LAST" "$TIMESTAMP"
if [ $? == 0 ]; then # no update, no fun
[ -n "$DEBUG" ] && echo "No update needed"
rm -f "$FLOCK"
rm -rf "$TMPDIR"
rm -f "$TIMESTAMP"
exit 0
fi
[ -n "$DEBUG" ] && echo "Downloading new database"
[ -f "$FNAME" ] && mv "$FNAME" "$FNAME.last"
wget -q -nd -i "$FNAME.link"
if [ $? != 0 ]; then
echo "problem with wget. quitting."
rm -f "$FNAME"
rm -f "$FNAME.link"
rm -f "$FLOCK"
exit 13
fi
if [ ! -f "$FNAME" ]; then
echo "PANIC! downloaded file not there! quitting."
rm -f "$FLOCK"
exit 20
fi
# protect from malicious proxy (webcache) and bugged tar
[ -n "$DEBUG" ] && echo "Validating archive listing"
tar ztf "$FNAME" | grep -v -q "^${SUBDIR}/\(mks[0-9a-zA-Z]*\.dat\)\{0,1\}$"
if [ $? == 0 ]; then
echo -e "PANIC! $MKS_URL contains invalid paths! quitting.\n"
tar ztf "$FNAME"
rm -f "$FLOCK"
exit 21
fi
[ -n "$DEBUG" ] && echo "Unpacking database"
tar zxf "$FNAME" -C "$TMPDIR"
ret=$?
if [ $ret != 0 ]; then
echo "problem with untarring: $ret. quitting."
rm -f "$FLOCK"
exit 14
fi
[ -n "$DEBUG" ] && echo "Installing database"
chmod 0644 $TMPDIR/$SUBDIR/*.dat
mv $TMPDIR/$SUBDIR/*.dat $MKS_PATH
logger -p "$LOGPRIO" -t "$LOGTAG" "MkS_Vir for Linux database successfully updated."
[ -n "$HUP" ] && killall -HUP "$HUP"
echo "mks_vir database successfully updated."
cat "$TIMESTAMP"
mv "$TIMESTAMP" "$LAST"
rm -rf "$TMPDIR"
[ "$REMOVE" != 0 ] && rm -f "$FNAME"
rm -f "$FLOCK"
exit 0
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