do_backup.sh

#!/bin/bash

# This depends on a file named `/root/backup_dirs` containing a list of directories to backup
# one per line. All directories in that file, plus a database dump, will be archived together.
#
# Further, if you have a gitolite installationn, this will backup every repo in an individual archive.

set -e
set -x
set -o pipefail

date=`date +%Y-%m-%d-%H-%M-%S`
hostname=`hostname`
database_dir=/tmp/databases
repo_dir=/home/git/repositories

mkdir -p $database_dir
chmod 777 $database_dir
cd $database_dir

if [[ -e /usr/bin/pg_dumpall ]]; then
    su -c "/usr/bin/pg_dumpall -f $database_dir/databases.sql" postgres
fi

backup_dirs="$database_dir"

for backup_dir in `cat /root/backup_dirs`; do
    if [[ -d $backup_dir ]]; then
        backup_dirs="$backup_dirs $backup_dir"
    fi
done

/usr/local/bin/tarsnap -c -f backup-$hostname-$date $backup_dirs

if [[ -d $repo_dir ]]; then
    pushd $repo_dir
    for repo in `find . -name '*.git' -type d`; do
        pushd $repo
        if [[ `date +%u` == "7" ]]; then
            git gc --aggressive --quiet
        else
            git gc --auto --quiet
        fi
        popd
        /usr/local/bin/tarsnap -c -f $repo-$date $repo
    done
    popd
fi