strip-jdk-installer.sh

#!/bin/bash

## Install Java Development Kit (JDK) without all the junk

# Strips the non-jdk stuff (Updater, Applet, Web Start, file associations) out of the installer.

# NB: this also removes the pre-installation checks and will install the JDK unconditionally
#     to /Library/Java/JavaVirtualMachines/ with possible but unlikely dire consequences


## Usage

    set -e

    if [[ -z "$2" ]] ; then
        echo 'usage: ./strip-jdk-installer dmgin dmgout'
        exit 0
    fi

    if [ ! -f "$1" ]; then
        echo "$1 does not exist"
        exit 0
    fi

    if [ -f "$2" ]; then
        echo "$2 already exists"
        exit 0
    fi

    TEMP_DIR="$(mktemp -d)/jdk"

## Unpack

    INSTALLER_VOL=$(hdiutil attach "$1" | grep -oe "/Volumes/.*")
    INSTALLER_PKG=$(ls -1 "$INSTALLER_VOL" | grep -oe "^.*pkg$")
    pkgutil --expand "$INSTALLER_VOL/$INSTALLER_PKG" "$TEMP_DIR"
    hdiutil detach "$INSTALLER_VOL" > /dev/null
    JDK_PKG=$(ls -1 "$TEMP_DIR" | grep -oe "^jdk.*pkg$")

## Strip JDK

    # disable Java Flight Recorder (JFR)
    sed -i '' '/^\(\.\/\)/d' "$TEMP_DIR/$JDK_PKG/Scripts/postinstall"
    rm "$TEMP_DIR/$JDK_PKG/Scripts/Tools"

    # disable Java Mission Control (JMC)
    sed -i '' '/com.oracle.jmc/d' "$TEMP_DIR/$JDK_PKG/PackageInfo"

## Repackage

    INSTALLER_NAME=$(echo "$INSTALLER_PKG" | grep -oe "[^.]*")
    mkdir -p "$TEMP_DIR/installer"
    pkgutil --flatten "$TEMP_DIR/$JDK_PKG" "$TEMP_DIR/installer/$INSTALLER_PKG"
    hdiutil create -volname "$INSTALLER_NAME" -srcfolder "$TEMP_DIR/installer" $2
    rm -rf "$TEMP_DIR"