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!"

Great work. Using perl to get the Volume name is a nice solution.

Thanks for that!

Nice one.

I wonder if it can be extended to also take a github repo name and pick the latest release and do the needful (like check if the app is already installed and if so check if the latest release is newer and only then install). The problem I am seeing is that many FOSS github repos are not publishing their products onto homebrew and that makes it harder to "upgrade" over time.