Download and install a .dmg

dmginstall.sh

#!/bin/bash

# Downloads and install a .dmg from a URL
#
# Usage
# $ dmginstall [url]
# 
# For example, for installing alfred.app
# $ dmginstall http://cachefly.alfredapp.com/alfred_1.3.1_261.dmg
#
# TODO
# - currently only handles .dmg with .app folders, not .pkg files
# - handle .zip files as well


if [[ $# -lt 1 ]]; then
  echo "Usage: dmginstall [url]"
  exit 1
fi

url=$*

# Generate a random file name
tmp_file=/tmp/`openssl rand -base64 10 | tr -dc '[:alnum:]'`.dmg
apps_folder='/Applications'

# Download file
echo "Downloading $url..."
curl -# -L -o $tmp_file $url

echo "Mounting image..."
volume=`hdiutil mount $tmp_file | tail -n1 | perl -nle '/(\/Volumes\/[^ ]+)/; print $1'`

# Locate .app folder and move to /Applications
app=`find $volume/. -name *.app -maxdepth 1 -type d -print0`
echo "Copying `echo $app | awk -F/ '{print $NF}'` into $apps_folder..."
cp -ir $app $apps_folder

# Unmount volume, delete temporal file
echo "Cleaning up..."
hdiutil unmount $volume -quiet
rm $tmp_file

echo "Done!"