get_jdk.sh

#!/bin/bash

if [ "$#" -ne 2 ]; then
    echo "Usage: $0 <version> <revision>"
    echo "for example for Java 1.8.0.92 it would be:"
    echo "$0 8 92"
    exit 1
fi

VERSION="$1u$2"
FILENAME="jdk-${VERSION}-linux-x64.tar.gz"
CHECKSUM_ERROR=0
i=0

function get_file () {
    local fname="http://download.oracle.com/otn-pub/java/jdk/$1"
    wget --header "Cookie: oraclelicense=accept-securebackup-cookie" \
        $fname -O /usr/portage/distfiles/$FILENAME
}

function check_file () {
    CHECKSUM_ERROR=0
    local expexted_sha256=$(grep $FILENAME \
        /usr/portage/dev-java/oracle-jdk-bin/Manifest | cut -d " " -f 5)
    local actual_sha256=$(sha256sum \
        /usr/portage/distfiles/$FILENAME |cut -d " " -f 1)

    [[ "${expexted_sha256}" == "${actual_sha256}" ]] && CHECKSUM_ERROR=1 \
        || echo "checksum error"
}


while true; do
    [[ $i -lt 10 ]] && DIR_NUMBER="0$i" || DIR_NUMBER="$i"
    echo "searching b$DIR_NUMBER"
    wget -q --spider --header "Cookie: oraclelicense=accept-securebackup-cookie" \
        "http://download.oracle.com/otn-pub/java/jdk/${VERSION}-b${DIR_NUMBER}/$FILENAME"

    if [[ $? == 0 ]]; then
        echo "${FILENAME} found in b${DIR_NUMBER}"
        get_file "${VERSION}-b${DIR_NUMBER}/$FILENAME"
        check_file
        if [[ $CHECKSUM_ERROR == 1 ]]; then
            echo "all done"
            break
        fi
    fi

    [[ $i -gt 100 ]] && echo "giving up" && break
    ((i++))
done