Mirror directory structures on remote and local machines.

mirror

#!/bin/bash
#
# Mirror directory structures on remote and local machines.
#
# This requires "mirror" accounts with sudo privileges having NOPASSWD for 
# /usr/bin/rsync.  This enables rsync to read/write files not owned by the 
# mirror.  The corresponding sudoers entry (visudo sudoers):
#
#   mirror ALL=(ALL) NOPASSWD: /usr/bin/rsync
#
# Mirrored files are stored in /backup/mirror/<HOSTNAME>/<...> on the local 
# machine.  Note that /backup could be a mounted external hard drive.
#
# To run regularly, set up the user crontab in the mirror account, (crontab -e):
#
#   0 3 * * * /home/mirror/.local/bin/backup
#
#
# CONTACT INFO
# author: Dustin Lennon
# email: dustin.lennon@gmail.com
#
#
#
# Set the location of the log file.
# LOGFILE=/home/mirror/logs/backup.log
#
# Set the name of the local machine
# LOCALHOST=192.168.1.103



timestamp() {
    if [ $# -lt 1 ]; then
        echo syntax error: usage: timestamp tag
        return 1
    fi

    tag=$1 && shift
    while read line; do
        ts=$(printf '%(%Y-%m-%d %H:%M:%S)T')
        echo "[${ts}] [${tag}] $line"
    done
}

logger() {
    if [ $# -lt 1 ]; then
        echo syntax error: usage: logger tag ...
        return 1
    fi

    tag=$1 && shift

    args=( "$@" )
    cmd=$(printf "%q "  "${args[@]}")
    
    LOGFILE=${LOGFILE:=/tmp/backup.log}
    eval $cmd | timestamp $tag | tee $LOGFILE
}

remote_mirror() {
    if [ $# -lt 2 ]; then
        echo syntax error: usage: remote_mirror host rooted_directory
        return 1
    fi

    host=$1 && shift
    rooted_directory=$1 && shift

    logger "remote_mirror" \
    echo "$host $rooted_directory"
    
    logger "rsync" \
    sudo \
        rsync -av \
        -e "sudo -u mirror ssh" \
        --relative \
        --delete \
        --rsync-path="sudo rsync -a" \
        ${host}:${rooted_directory} /backup/mirror/${host}

}

local_mirror() {
    if [ $# -eq 0 ]; then
        echo syntax error: usage: local_mirror rooted_directory
        return 1
    fi

    rooted_directory=$1 && shift
    host=${LOCALHOST:="localhost"}

    logger "local_mirror" \
    echo "$rooted_directory"

    logger "rsync" \
    sudo \
        rsync -av \
        --relative \
        --delete \
        ${rooted_directory} /backup/mirror/${host}

}


REMOTEHOST=192.168.1.102
remote_mirror $REMOTEHOST /etc
remote_mirror $REMOTEHOST /var/lib
remote_mirror $REMOTEHOST /home/dustin
remote_mirror $REMOTEHOST /home/deploy
remote_mirror $REMOTEHOST /media/streaming

local_mirror /etc
local_mirror /home/dnlennon