#!/bin/sh
# script by Michael Shigorin <mike@osdn.org.ua> for snapshotting
# ALT Linux Sisyphus locally; feel free to use and modify, would
# be glad to hear back about changes

# v0.2: fix STUPID bug which manifested when doing several 
# syncs per day *and* the first wasn't done off complete (stable)
# mirror

# v0.3: better $DEST handling in case of repeated rsync failures
# during some period of time *but* with some data transferred
# so they better not get lost and re-rsynced

# v0.4: TIMESTAMP fix by Denis Smirnov (mithraen@altlinux) induced
# by discussion with Dmitry Levin (ldv@altlinux)

# v0.5: altlinux-release is searched in noarch instead of i586

# mirror/site-specific
SRC="ftp.altlinux.org.ua::ALTLinux/Sisyphus/"
BASEDIR="/var/ftp/pub/EMT/Sisyphus/"

# retry params
MAXCOUNT=5
TIMEOUT=60

# shouldn't need to be changed
DATE=`date +%Y%m%d`
LOGDIR="$BASEDIR/log/"
LOGFILE="$LOGDIR/$DATE.log"
DEST="$BASEDIR/.syncing/"

RSYNCARGS="-av --partial --delete --bwlimit=120"

RPMARGS="-qp --queryformat %{RELEASE}\n"
TAGFILE="$DEST/files/noarch/RPMS/altlinux-release-Sisyphus-alt*.noarch.rpm"

unset OK

# init env
mkdir -p "$BASEDIR" "$LOGDIR"
cd "$BASEDIR"

# create hardlinked copy or init dir
LAST=`ls -d1 20?????? 2>/dev/null | tail -1`
[ -d "$DEST" ] || mkdir -p "$DEST"
[ -n "$LAST" ] && {
	[ `/bin/du -s "$LAST" |cut -f1` -gt `/bin/du -s "$DEST" |cut -f1` ] && {
		cp -alf "$LAST"/* "$DEST"
	}
}

# try to sync up
for attempt in `seq 1 $MAXCOUNT`; do 
	rsync $RSYNCARGS "$SRC" "$DEST" 2>&1 >> "$LOGFILE" && {
		OK="yes"
		break
	}
	sleep "$TIMEOUT"
done

[ -z "$OK" ] && exit 1

# get timestamp from specific package and move to it
#TIMESTAMP=`rpm $RPMARGS $TAGFILE | tail -1 | sed 's/alt//'`
TIMESTAMP=$(date +"%Y%m%d" -d "$(grep ^Date: $TAGFILE | sed 's!.*\([0-9][0-9] ... [0-9][0-9][0-9][0-9]\).*!\1!')")

[ -d "$TIMESTAMP" ] && {
	rsync $RSYNCARGS "$DEST" "$TIMESTAMP"/ 2>&1 >> "$LOGFILE"
} || {
	mv "$DEST" "$TIMESTAMP" 2>>"$LOGFILE"
}

touch -d "$DATE" "$TIMESTAMP"
rm -f current
ln -s "$TIMESTAMP" current

rm -rf "$DEST"

# that's all :)
echo "** $TIMESTAMP sync OK" >> "$LOGFILE"