Download and install a .dmg

dmginstall.sh

#!/bin/bash --login

# Downloads and installs a .dmg from a URL
#
# Usage
# $ dmginstall [url]
#
# For example, for installing wireshark version 3.0.2
# $ dmginstall https://1.na.dl.wireshark.org/osx/Wireshark%203.0.2%20Intel%2064.dmg
# or for firefox version 68.0
# $ dmginstall https://download-installer.cdn.mozilla.net/pub/firefox/releases/68.0/mac/en-US/Firefox%2068.0.dmg
# TODO
# - handle .zip files as well

VERBOSE=false
Failed=false
apps_folder='/Applications'

function usage() { echo "Usage: $0 [-v] [-h] <url_to_package>
	-h			This help menu
	-v			Verbose mode, show debugging info" 1>&2; exit 1; }

while getopts dpvh opts; do
   case ${opts} in
      v) VERBOSE=true ;;
      h) usage ;;
      *) usage ;;
   esac
done
shift $((OPTIND-1))
URL=$*


# some functions to use for output.
function Announce(){
  Spacer='\n=======================================\n'
  printf "\n$Spacer$1$Spacer"
}

function Say(){
  Spacer='\n---------------------------------------\n'
  printf "\n$Spacer$1$Spacer"
}

function Debug(){
  if $VERBOSE; then
    printf "\nDEBUG: $1\n"
  fi
}

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


# bootstrapping done, lets start intalling


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

Debug "Temporary file is $tmp_file"

Announce "Mounting image..."
# Mount the package and save disk and volume locations
app_location=$(hdiutil attach $tmp_file | tail -n 1 | tr -s "[:blank:]" "\n")

# Get disk of the mounted package. e.x. /dev/disk3s3
app_disk=$(echo $app_location | tr -s " " "\n" | head -n 1)

# Get the Volume of the package. e.x. /Volumes/Wireshark
if [ $(echo $app_location | tr -s " " "\n" | wc -l ) -gt 3 ]; then
  # If the same disk is mounted multiple times, an additional number will be returned, we don't want that
  app_volume=$(echo $app_location | tr -s " " "\n" | tail -n 2 | head -n 1)
else
  # If this is the first mount of the image, just get the volume.
  app_volume=$(echo $app_location | tr -s " " "\n" | tail -n 1)
fi

# Determine the file we want to install and get file type of that file
file_type=$(find $app_volume/ -regex '.*.[app|pkg]' -maxdepth 1 | head -n 1 | tr "." "\n" | tail -n 1)


# Some Debugging to make sure we're on the right track.
Debug "App Location: $app_location"
Debug "App Disk:     $app_disk"
Debug "App Volume:   $app_volume"
Debug "File Type:    $file_type"

Announce "Installing"

if [ ! $file_type != 'pkg' ]; then
  echo "Installing pkg..."
  # pkg can be installed with mac's built in installer
  /usr/sbin/installer -pkg $app_volume/*.pkg -target /
elif [ ! $file_type != 'app' ]; then
  echo "Installing app..."
  # app can be installed by copying directory over to applications directory
  app=`find $app_volume/. -name *.app -maxdepth 1 -type d -print0`
  cp -ir $app $apps_folder
else
  echo "Installation failed."
  echo "Error: $file_type is not supported."
  Failed=true
fi

Announce "Cleaning up..."
Debug "un-mounting image"
hdiutil detach $app_disk
Debug "Removing temp file"
rm $tmp_file

echo "Done!"
# Wait until after un-mounting to throw error
if Failed; then
  exit 1;
fi