Gen update with commandline params

gen_update.sh

#!/bin/bash

# To check tags, run this in the browser 
# https://api.github.com/repos/ushahidi/Ushahidi_Web/tags

if [[ $# -lt 2 ]]
then
  echo "Usage: gen_updates.sh [previous-tag] [current-tag]"
  exit 1
fi

CURRENT_TAG=$2
PREVIOUS_TAG=$1

TMPDIR=`mktemp -d -t ushahidi-upgrade.XXXXXXXXXX`


git checkout $CURRENT_TAG
mkdir $TMPDIR/ushahidi/
# Copy updated files with rsync so we preserve directory structure
rsync -Rva $(git diff $PREVIOUS_TAG $CURRENT_TAG --name-only) $TMPDIR/ushahidi/
# Add list of deleted files
git diff $PREVIOUS_TAG $CURRENT_TAG --diff-filter=D > $TMPDIR/ushahidi/upgrader_removed_files.txt
# Zip everything up
rm -f ~/ushahidi_${PREVIOUS_TAG}_${CURRENT_TAG}.zip
pushd $TMPDIR
zip -r ~/ushahidi_${PREVIOUS_TAG}_${CURRENT_TAG}.zip ushahidi

# Back to where we were
popd