store_backup

#!/bin/bash

set -e

function info() { echo "$@" >&2; }
function error() { echo "ERROR: $@" >&2; exit 1; }

# read global config file
conffile=$(cd $(dirname $0)/.. && pwd -P)/etc/backup.conf
[[ ! -r $conffile ]] && error "Unable to read configuration file $conffile"
. $conffile

# check mandatory options
[[ -z "$BACKUP_HOSTS_DIR" ]] && error "Invalid backup dir for hosts"

# parse arguments
host=$1
[[ -z "$host" ]] && error "Invalid hostname"

bakname=$2
[[ -z "$bakname" ]] && error "Invalid backup name"

# load host-specific config if any
[[ -f $BACKUP_HOSTS_DIR/$host/backup.conf ]] && . $BACKUP_HOSTS_DIR/$host/backup.conf

# move to backup dir
mkdir -p $BACKUP_HOSTS_DIR
cd $BACKUP_HOSTS_DIR

# create per-host directory
mkdir -p $host || error "Unable to create backup dir for $host"

# save transmitted file
outfile=$host/$(date +%Y%m%d_%H%M%S)_${bakname}
info "Saving backup on $(hostname -f):$(pwd -P)/$outfile"
if [[ -n $(which pv) ]];  then
	$(which pv) -trafpb >$outfile
elif [[ -n $(which buffer) ]]; then
	time $(which buffer) -z 256K -o $outfile
else
	cat >$outfile
fi
info "Done"

# remove old backups
if [[ "$BACKUP_MAX_AGE" -gt 0 ]]; then
	for x in $(find $host -type f -mtime +$BACKUP_MAX_AGE); do
		info "Removing old backup $x"
		rm $x
	done
fi

# push last backup to secondary if defined
if [[ -n "$BACKUP_SECONDARY_SERVER" ]]; then
	info "Sending backup to seconday server $BACKUP_SECONDARY_SERVER"
	cat $outfile | ssh $BACKUP_SECONDARY_SERVER store_backup $host $bakname
fi