#! /bin/bash

set -e

# ftpsync script for Debian
# Based losely on a number of existing scripts, written by an
# unknown number of different people over the years.
#
# 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; version 2.
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.

# In case the admin somehow wants to have this script located someplace else,
# he can set BASEDIR, and we will take that. If it is unset we take ${HOME}
# How the admin sets this isn't our place to deal with. One could use a wrapper
# for that. Or pam_env. Or whatever fits in the local setup. :)
BASEDIR=${BASEDIR:-"${HOME}"}

# Source our common functions
. ${BASEDIR}/etc/common

# Read our config file
NAME="`basename $0`"

# In case we are called with an argument we look for a different configuration.
if [ -n "$1" ]; then
	NAME="${NAME}-$1"
fi
. ${BASEDIR}/etc/${NAME}.conf

########################################################################
# Config options go here. Feel free to overwrite them in the config    #
# file if you need to.                                                 #
# On debian.org machines the defaults should be ok.                    #
#                                                                      #
# The following extra variables can be defined in the config file:     #
#                                                                      #
# ARCH_EXCLUDE                                                         #
#  can be used to exclude a complete architecture from                 #
# mirrorring. Use as space seperated list.                             #
# Possible values are:                                                 #
# alpha, amd64, arm, armel, hppa, hurd-i386, i386, ia64,               #
# m68k, mipsel, mips, powerpc, s390, sh, sparc and source              #
# eg. ARCH_EXCLUDE="alpha arm armel mipsel mips s390 sparc"            #
#                                                                      #
# An unset value will mirror all architectures                         #
########################################################################

########################################################################
# There should be nothing to edit here, use the config file            #
########################################################################
HOSTNAME=${HOSTNAME:-`hostname -f`}
# Where to put logfiles in
LOGDIR=${LOGDIR:-"${BASEDIR}/log"}
# Our own logfile
LOG=${LOG:-"${LOGDIR}/${NAME}.log"}

# Where should we put all the mirrored files?
TO=${TO:-"/org/ftp.debian.org/ftp/"}

# used by log()
PROGRAM=${PROGRAM:-"${NAME}-$(hostname -s)"}

# Where to send mails about mirroring to?
MAILTO=${MAILTO:-"mirrorlogs@debian.org"}
# Want errors only or every log?
ERRORSONLY=${ERRORSONLY:-"false"}

# How to rotate our log
SAVELOG=${SAVELOG:-"savelog -t -c 14"}
# Lockfile program
LOCKFILE=${LOCKFILE:-"lockfile"}

# Our lockfile
LOCK=${LOCK:-"${TO}/Archive-Update-in-Progress-${HOSTNAME}"}
# Do we need another rsync run?
UPDATEREQUIRED="${TO}/Archive-Update-Required-${HOSTNAME}"
# Trace file for mirror stats and checks
TRACE=${TRACE:-"project/trace/$(hostname -f)"}

# rsync program
RSYNC=${RSYNC:-rsync}
# Default rsync options for *every* rsync call
RSYNC_OPTIONS=${RSYNC_OPTIONS:-"-rltvHSB8192 --timeout 3600 --stats --exclude Archive-Update-in-Progress-${HOSTNAME} --exclude ${TRACE} --exclude Archive-Update-Required-${HOSTNAME}"}
# Options we only use in the first pass, where we do not want packages/sources to fly in yet and dont want to delete files
RSYNC_OPTIONS1=${RSYNC_OPTIONS1:-"--exclude Packages* --exclude Sources* --exclude Release* --exclude ls-lR*"}
# Options for the second pass, where we do want everything, including deletion of old and now unused files
RSYNC_OPTIONS2=${RSYNC_OPTIONS2:-"--max-delete=40000 --delay-updates --delete --delete-after"}
# Which rsync share to use on our upstream mirror?
RSYNC_PATH=${RSYNC_PATH:-"ftp"}

# General excludes. Dont list architecture specific stuff here, use ARCH_EXCLUDE for that!
EXCLUDE=${EXCLUDE:-""}

# The temp directory used by rsync --delay-updates is not
# world-readable remotely. Always exclude it to avoid errors. 
EXCLUDE="${EXCLUDE} --exclude .~tmp~/"


SOURCE_EXCLUDE=
# Exclude architectures defined in $ARCH_EXCLUDE
for ARCH in ${ARCH_EXCLUDE}; do
    EXCLUDE=${EXCLUDE}"\
                --exclude binary-${ARCH}/ \
                --exclude disks-${ARCH}/ \
                --exclude installer-${ARCH}/ \
                --exclude Contents-${ARCH}.gz \
                --exclude Contents-${ARCH}.diff/ \
                --exclude arch-${ARCH}.files \
                --exclude arch-${ARCH}.list.gz \
                --exclude *_${ARCH}.deb \
                --exclude *_${ARCH}.udeb "
    if [ "${ARCH}" = "source" ]; then
        SOURCE_EXCLUDE="\
                --exclude source/ \
                --exclude *.tar.gz \
                --exclude *.diff.gz \
                --exclude *.dsc "
    fi
done

# Some sane defaults
cd ${BASEDIR}
umask 002

# If we are here for the first time, create the
# destination and the trace directory
mkdir -p ${TO}/project/trace

# Used to make sure we will have the archive fully and completly synced before
# we stop, even if we get multiple pushes while this script is running.
# Otherwise we can end up with a half-synced archive:
# - get a push
# - sync, while locked
# - get another push. Of course no extra sync run then happens, we are locked.
# - done. Archive not correctly synced, we don't have all the changes from the second push.
touch "${UPDATEREQUIRED}"

# All the stuff we want to do when we exit, no matter where
cleanup() {
	trap - ERR TERM HUP INT QUIT EXIT
	# all done. Mail the log, exit.
	log "Mirrorsync done";
	if [ -n "${MAILTO}" ]; then
        # In case rsync had something on stderr
		if [ -s "${LOGDIR}/rsync-${NAME}.error"]; then
			cat "${LOGDIR}/rsync-${NAME}.error" | mail -e -s "$PROGRAM rsync ERROR ($(hostname -s)) [$$]" ${MAILTO}
		fi
		if [ "x${ERRORSONLY}x" = "xfalsex" ]; then
			# And the normal log
			mail -e -s "${PROGRAM} ($(hostname)) - archive sync finished on $(date +"%Y.%m.%d-%H:%M:%S")" ${MAILTO} < ${LOG}
		fi
	fi

	${SAVELOG} ${LOGDIR}/rsync-${NAME}.log
	${SAVELOG} ${LOGDIR}/rsync-${NAME}.error
	${SAVELOG} "$LOG" > /dev/null

	rm -f ${LOCK};
}

# Check to see if another sync is in progress
if ${LOCKFILE} -! -l 43200 -r 0 "${LOCK}"; then
        error "Unable to start rsync, lock file still exists"
        exit 1
fi
trap cleanup EXIT ERR TERM HUP INT QUIT

# Start log by redirecting everything there.
exec >"$LOG" 2>&1
log "Mirrorsync start"
log "Acquired main lock"

export RSYNC_PASSWORD

if [ -n "${HOOK1}" ]; then
	log "Running hook1: ${HOOK1}"
	${HOOK1}
	result=$?
	log "Back from hook1, got returncode ${result}"
fi

# Now, we might want to sync from anonymous too.
# This is that deep in this script so hook1 could, if wanted, change things!
if [ -z ${RSYNC_USER} ]; then
	RSYNCPTH="${RSYNC_HOST}"
else
	RSYNCPTH="${RSYNC_USER}@${RSYNC_HOST}"
fi

# Now do the actual mirroring, and run as long as we have an updaterequired file.
while [ -e "${UPDATEREQUIRED}" ]; do
	log "Running mirrorsync, update is required, ${UPDATEREQUIRED} exists"
	rm -f "${UPDATEREQUIRED}"

	# Step one, sync everything except Packages/Releases
	${RSYNC} ${RSYNC_OPTIONS} ${RSYNC_OPTIONS1} ${EXCLUDE} ${SOURCE_EXCLUDE} \
		${RSYNCPTH}::${RSYNC_PATH} ${TO} >${LOGDIR}/rsync-${NAME}.log 2>${LOGDIR}/rsync-${NAME}.error

	result=$?
	# 24 - vanished source files. Ignored, that should be the target of $UPDATEREQUIRED
	# and us re-running. If it's not, uplink is broken anyways.
	if [ $result -eq 0 ] || [ $result -eq 24 ]; then

		if [ -n "${HOOK2}" ]; then
			log "Running hook2: ${HOOK1}"
			${HOOK2}
			result=$?
			log "Back from hook1, got returncode ${result}"
		fi

		# We are lucky, it worked. Now do step 2 and sync again, this time including
		# the packages/releases files
		${RSYNC} ${RSYNC_OPTIONS} ${RSYNC_OPTIONS2} ${EXCLUDE} ${SOURCE_EXCLUDE} \
			${RSYNCPTH}::${RSYNC_PATH} ${TO} >${LOGDIR}/rsync-${NAME}.log 2>${LOGDIR}/rsync-${NAME}.error
		result=$?
		if [ $result -eq 0 ] || [ $result -eq 24 ]; then
			if [ -n "${HOOK3}" ]; then
				log "Running hook3: ${HOOK1}"
				${HOOK3}
				result=$?
				log "Back from hook3, got returncode ${result}"
			fi
		else
			error "ERROR: Sync step 2 went wrong, got errorcode ${result}. Logfile: ${LOG}"
			exit 4
		fi
	else
		error "ERROR: Sync step 1 went wrong, got errorcode ${result}. Logfile: ${LOG}"
		exit 3
	fi
done

if [ -d "${TO}/project/trace" ]; then
      date -u > "${TO}/${TRACE}"
fi

if [ -n "${HOOK4}" ]; then
	log "Running hook4: ${HOOK1}"
	${HOOK4}
	result=$?
	log "Back from hook4, got returncode ${result}"
fi

if [ x${HUB} = "xtrue" ]; then
	log "Trigger slave mirrors"
	${BASEDIR}/bin/runmirrors
	log "Trigger slave done"

	if [ -n "${HOOK5}" ]; then
		log "Running hook5: ${HOOK1}"
		${HOOK5}
		result=$?
		log "Back from hook5, got returncode ${result}"
	fi
fi

# All done, remove our LOCK, rest is done by cleanup hook.
rm -f $LOCK