Revert of Android: Update docs to say Java 8 is required

build/install-build-deps-android.sh

-#!/bin/bash
+#!/bin/bash -e
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to install everything needed to build chromium on android, including
 # items requiring sudo privileges.
 # See https://www.chromium.org/developers/how-tos/android-build-instructions
 
+# This script installs the sun-java6 packages (bin, jre and jdk). Sun requires
+# a license agreement, so upon installation it will prompt the user. To get
+# past the curses-based dialog press TAB <ret> TAB <ret> to agree.
+
 args="$@"
 
 if ! uname -m | egrep -q "i686|x86_64"; then
   echo "Only x86 architectures are currently supported" >&2
   exit
 fi
 
-# Exit if any commands fail.
-set -e
+lsb_release=$(lsb_release --codename --short)
 
-lsb_release=$(lsb_release --codename --short)
+case $lsb_release in
+  xenial|yakkety)
+    java_alternative="java-1.8.0-openjdk-amd64"
+    java_pkgs="openjdk-8-jre openjdk-8-jdk"
+  ;;
+  *)
+    java_alternative="java-1.7.0-openjdk-amd64"
+    java_pkgs="openjdk-7-jre openjdk-7-jdk"
+  ;;
+esac
 
 # Install first the default Linux build deps.
 "$(dirname "${BASH_SOURCE[0]}")/install-build-deps.sh" \
   --no-syms --lib32 --no-arm --no-chromeos-fonts --no-nacl --no-prompt "${args}"
 
+# The temporary directory used to store output of update-java-alternatives
+TEMPDIR=$(mktemp -d)
+cleanup() {
+  local status=${?}
+  trap - EXIT
+  rm -rf "${TEMPDIR}"
+  exit ${status}
+}
+trap cleanup EXIT
+
 # Fix deps
 sudo apt-get -f install
 
+# Install deps
+# This step differs depending on what Ubuntu release we are running
+# on since the package names are different, and Sun's Java must
+# be installed manually on late-model versions.
+
 # common
 sudo apt-get -y install lib32z1 lighttpd python-pexpect xvfb x11-utils
 
 # Some binaries in the Android SDK require 32-bit libraries on the host.
 # See https://developer.android.com/sdk/installing/index.html?pkg=tools
 if [[ $lsb_release == "precise" ]]; then
   sudo apt-get -y install ia32-libs
 else
   sudo apt-get -y install libncurses5:i386 libstdc++6:i386 zlib1g:i386
 fi
 
-# Required by //components/cronet/tools/generate_javadoc.py
-# TODO(375324): Stop requiring ANT.
 sudo apt-get -y install ant
 
 # Required for apk-patch-size-estimator
 sudo apt-get -y install bsdiff
 
-# Do our own error handling for java.
-set +e
+# Install openjdk and openjre stuff
+sudo apt-get -y install $java_pkgs
 
-function IsJava8() {
-  # Arg is either "java" or "javac"
-  $1 -version 2>&1 | grep -q '1\.8'
-}
-
-if ! (IsJava8 java && IsJava8 javac); then
-  sudo apt-get -y install openjdk-8-jre openjdk-8-jdk
-fi
-
-# There can be several reasons why java8 is not default despite being installed.
-# Just show an error and exit.
-if ! (IsJava8 java && IsJava8 javac); then
-  echo
-  echo "Automatic java installation failed."
-  echo '`java -version` reports:'
-  java -version
-  echo
-  echo '`javac -version` reports:'
-  javac -version
-  echo
-  echo "Please ensure that JDK 8 is installed and resolves first in your PATH."
-  echo -n '`which java` reports: '
-  which java
-  echo -n '`which javac` reports: '
-  which javac
-  echo
-  echo "You might also try running:"
-  echo "    sudo update-java-alternatives -s java-1.8.0-openjdk-amd64"
-  exit 1
+# Switch version of Java to openjdk 7.
+# Some Java plugins (e.g. for firefox, mozilla) are not required to build, and
+# thus are treated only as warnings. Any errors in updating java alternatives
+# which are not '*-javaplugin.so' will cause errors and stop the script from
+# completing successfully.
+if ! sudo update-java-alternatives -s $java_alternative \
+           >& "${TEMPDIR}"/update-java-alternatives.out
+then
+  # Check that there are the expected javaplugin.so errors for the update
+  if grep 'javaplugin.so' "${TEMPDIR}"/update-java-alternatives.out >& \
+      /dev/null
+  then
+    # Print as warnings all the javaplugin.so errors
+    echo 'WARNING: java-6-sun has no alternatives for the following plugins:'
+    grep 'javaplugin.so' "${TEMPDIR}"/update-java-alternatives.out
+  fi
+  # Check if there are any errors that are not javaplugin.so
+  if grep -v 'javaplugin.so' "${TEMPDIR}"/update-java-alternatives.out \
+      >& /dev/null
+  then
+    # If there are non-javaplugin.so errors, treat as errors and exit
+    echo 'ERRORS: Failed to update alternatives for java-6-sun:'
+    grep -v 'javaplugin.so' "${TEMPDIR}"/update-java-alternatives.out
+    exit 1
+  fi
 fi
 
 echo "install-build-deps-android.sh complete."