backup-ftp

#!/bin/bash

INFO="
Use 'lftp' to download a snapshot of a remote FTP directory.

Usage:
    backup-ftp -u <user> -p <password> [ -o <outfile.tgz> ] host
"

if test -z "$1"; then
    echo "$INFO" 1>&2
    exit 1
fi

TMPDIR=$(mktemp -d) || exit 1
trap "rm -rf $TMPDIR" EXIT

USER=
PASS=
while test -n "$1"; do
    FILE=
    while getopts "u:p:" opt; do
        case "$opt" in
            u) USER="$OPTARG" ;;
            p) PASS="$OPTARG" ;;
            o) FILE="$OPTARG" ;;
            *) exit 1 ;;
        esac
    done
    shift $(($OPTIND - 1))
    HOST="$1"
    shift
    if test -z "$HOST"; then
        echo "Error: No host specified!" 1>&2
        exit 1
    fi
    test -n "$FILE" || FILE="ftp-$HOST-$(date '+%Y-%m-%d').tgz"
    if test -e "$FILE"; then
        echo "Warning: Skipping '$FILE'" 1>&2
        continue
    fi
    if test -e "$FILE"; then
        echo "Error: '$FILE.NEW' exits!" 1>&2
        exit 1
    fi
    rm -rf "$TMPDIR/mirror" || true
    mkdir "$TMPDIR/mirror" || exit 1
    CMD="mirror --parallel=10 . $TMPDIR/mirror"
    echo "$CMD" | lftp -u "$USER,$PASS" "$HOST" || exit 1
    if ! tar -C "$TMPDIR/mirror" -c . | gzip > "$FILE.NEW"; then
        rm "$FILE.NEW"
        exit 1
    fi
    mv "$FILE.NEW" "$FILE" || exit 1
done