nightly_backup.sh

#!/bin/bash

REPOSITORY_DIR=$1
BACKUP_DESTINATION=$2
CURRENTDATE=$(date +"%Y_%m_%d")
BACKUP_ZIP=$BACKUP_DESTINATION$CURRENTDATE".zip"

echo "Backing up under the name of "$CURRENTDATE" to "$BACKUP_ZIP

function backup_mercurial_repo {
	REPO_PATH=$1
	REPO_NAME=$(basename $REPO_PATH)
	BACKUP_FILE=$BACKUP_DESTINATION$CURRENTDATE"_"$REPO_NAME".diff"
	echo $REPO_NAME" is a mercurial repo, backing up to "$BACKUP_FILE
	hg diff -R $REPO_PATH > $BACKUP_FILE
	zip -j $BACKUP_ZIP $BACKUP_FILE
	rm $BACKUP_FILE
}

function backup_git_repo {
	REPO_PATH=$1
	REPO_NAME=$(basename $REPO_PATH)
	BACKUP_FILE=$BACKUP_DESTINATION$CURRENTDATE"_"$REPO_NAME".diff"
	echo $REPO_NAME" is a git repo, backing up to "$BACKUP_FILE
	cd $REPO_PATH
	git diff > $BACKUP_FILE
	zip -j $BACKUP_ZIP $BACKUP_FILE
	rm $BACKUP_FILE
}

# Loop through given repository directory
for f in $REPOSITORY_DIR*;
  do 
    # if mercurial, back it up using mercurials process
	[ -d $f/.hg ] && backup_mercurial_repo $f
	
	# if git, back it up using gits process
    [ -d $f/.git ] && backup_git_repo $f
  done;