#!/bin/bash

statusfile=/var/tmp/backup.monitoring
ssh_login="${username}@${server}"
ssh_cmnd="ssh -o IdentityFile=/etc/backup.priv -o StrictHostKeyChecking=accept-new -p ${port}"

<%text>
NL=$'\n'

if ! [[ -f /etc/backup.priv ]]
then
    echo "/etc/backup.priv does not exist" | logger -t backup-client -p user.error
    echo "abort_no_key" > "$statusfile"
    exit 1
fi

run-parts --exit-on-error -- /etc/backup-pre-hooks.d
exitcode=$?
if [[ $exitcode != 0 ]]
then
    echo "run-parts /etc/backup-pre-hooks.d exited $exitcode" | logger -t backup-client -p user.error
    echo "hook $exitcode" > "$statusfile"
    exit 1
fi

do_backup() {
    rsync_errorcodes_for_this_path=""
    backup_has_successfully_run="no"

    for try in {1..5}
    do
        echo "Backup for '$1', try $try ..." | logger -t backup-client -p user.info

        # 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_cmnd" \
            "$1" "$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' try $try exited $exitcode" | logger -t backup-client -p user.info
        if [[ $exitcode != 0 ]] && [[ $exitcode != 24 ]]
        then
            rsync_errorcodes_for_this_path+=" $exitcode"
            sleep 30
        else
            backup_has_successfully_run="yes"
            break
        fi
    done

    if [[ "$backup_has_successfully_run" != "yes" ]]
    then
        echo "Backup for '$1' did not succeed!" | logger -t backup-client -p user.error
        rsync_errors+="${NL}${1}${rsync_errorcodes_for_this_path}"
    fi
}

rsync_errors=""
</%text>

% for path in sorted(paths):
do_backup "${path}"
% endfor

if [[ -n "$rsync_errors" ]]
then
    echo "rsync_error$rsync_errors" > "$statusfile"
else
    echo "ok" > "$statusfile"
fi