bundlewrap/bundles/backup-client/files/generate-backup

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#!/bin/bash
statusfile="/var/tmp/backup.monitoring"
logdir="/var/log/backup-client"
lock="/tmp/backup-client-is-running"
ssh_login="${username}@${server}"
ssh_opts="-o IdentityFile=/etc/backup.priv -o StrictHostKeyChecking=accept-new -p ${port}"
nodename="${node.name}"
<%text>
try="${1:-<unknown>}"
[[ -n "$DEBUG" ]] && set -x
2021-08-04 13:55:14 +00:00
do_backup() {
echo "==> starting backup for '$1'"
# Compress level 1 is a good compromise between speed and cpu usage.
rsync --compress-level=1 -aAP --numeric-ids --delete --relative \
--rsync-path="/usr/bin/rsync --fake-super" \
-e "ssh $ssh_opts" \
"$1" "$ssh_login":backups/
# Exit code 24 means some files have vanished during rsync.
# I don't know why, but this is very common, apparently?
exitcode=$?
echo "==> backup for '$1' exited $exitcode"
if [[ $exitcode != 0 ]] && [[ $exitcode != 24 ]]
then
rsync_errors+=" $1 ($exitcode)"
fi
}
on_exit() {
rmdir "$lock"
echo "*** END BACKUP RUN $(date '+%F %T %z') ***"
}
prepare_and_cleanup_logdir() {
# rsync logs tend to get very large. That's why we pipe them through
# gzip when writing. Because we're running multiple tries, we cannot
# rely on logrotate to rotate the logs, we have to do it ourselves.
# Of course that means we have to clean up after ourselves, too.
mkdir -p "$logdir"
find "$logdir" -type f -mtime +14 -name "*.log" -delete
find "$logdir" -type f -mtime +14 -name "*.gz" -delete
}
save_result_for_monitoring() {
code=$1
msg=$2
printf "status=%q\n" "$code" > "$statusfile"
printf "msg=%q\n" "$msg" >> "$statusfile"
printf "timestamp=%q\n" "$(date +%s)" >> "$statusfile"
}
if ! mkdir "$lock" >/dev/null 2>&1
then
save_result_for_monitoring 2 "could not get lock"
exit 1
fi
trap "on_exit" EXIT
# redirect stdout and stderr to logfile
prepare_and_cleanup_logdir
if [[ -z "$DEBUG" ]]
then
logfile="$logdir/backup--$(date '+%F--%H-%M-%S')--$$.log.gz"
echo "All log output will go to $logfile" | logger -it backup-client
exec > >(gzip >"$logfile")
exec 2>&1
fi
# this is where the real work starts
ts_begin=$(date +%s)
echo "*** BEGIN BACKUP RUN $(date '+%F %T %z') ***"
echo "This is attempt $try"
echo "using ssh options [$ssh_opts]"
echo "using ssh login [$ssh_login]"
if ! [[ -f /etc/backup.priv ]]
then
save_result_for_monitoring 2 "/etc/backup.priv does not exist"
exit 100
fi
for i in /etc/backup-pre-hooks.d/*
do
[[ -x "$i" ]] || continue
echo "Running pre-hook '$i'"
if ! $i
then
save_result_for_monitoring 2 "pre-hook '$i' failed to run"
exit 1
fi
done
rsync_errors=""
</%text>
% for path in sorted(paths):
do_backup "${path}"
% endfor
<%text>
if [[ -n "$rsync_errors" ]]
then
save_result_for_monitoring 2 "rsync failed:$rsync_errors"
exit 1
fi
ssh $ssh_opts $ssh_login "sudo /usr/local/bin/rotate-single-backup-client $nodename" </dev/null
ssh_error=$?
if [[ $ssh_error -ne 0 ]]
then
save_result_for_monitoring 2 "rotating backups failed with status code $ssh_error"
exit 1
fi
ts_end=$(date +%s)
echo "Success"
save_result_for_monitoring 0 "Backup finished at $(date '+%F %T %z') (took $((ts_end - ts_begin)) seconds)"
</%text>