Migrate into besu from pantheon (#2)

Include the update to 1.2.4

Signed-off-by: Edward Evans <[email protected]>

README.md

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+# homebrew-besu
+ [![RocketChat chat](https://open.rocket.chat/images/join-chat.svg)](https://chat.hyperledger.org/channel/besu)
+ [![Documentation Status](https://readthedocs.org/projects/hyperledger-besu/badge/?version=latest)](https://besu.hyperledger.org/en/latest/?badge=latest)
+ [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/hyperledger/homebrew-besu/blob/master/LICENSE)
+Homebrew Tap for besu.
+
+## Getting started
+Add the tap, and install:
+
+```
+brew tap hyperledger/besu
+brew install besu
+```
+Run the besu executable:
+
+```
+besu --help
+```
+
+Refer to the [besu docs](https://besu.hyperledger.org) for further information.
+
+To upgrade besu:
+```
+brew tap hyperledger/besu
+brew upgrade besu
+```

besu.rb

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+class Besu < Formula
+  desc "hyperledger besu ethereum client"
+  homepage "https://github.com/hyperledger/besu"
+  url "https://dl.bintray.com/hyperledger-org/besu-repo/besu-1.2.4.zip"
+  # update with: ./updateBesu.sh <new-version>
+  sha256 "8df0adb5a15c28cf4c177e40a10c9721ec0ec74a7037d5c8043c06bc04b74097"
+
+  depends_on :java => "11+"
+
+  def install
+    prefix.install "lib"
+    bin.install "bin/besu"
+  end
+
+  test do
+    system "#{bin}/besu" "--version"
+  end
+end

updateBesu.sh

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+#!/bin/bash
+set -euo pipefail
+TEMP=`mktemp -d`
+
+function cleanup() {
+	rm -rf "${TEMP}"
+}
+trap cleanup EXIT
+
+VERSION=${1?Must specify the besu version to get}
+URL="https://dl.bintray.com/hyperledger-org/besu-repo/besu-${VERSION}.zip"
+echo "Downloading version ${VERSION} of besu from ${URL}..."
+curl -o "${TEMP}/besu-${VERSION}.zip" -L --fail "${URL}"
+
+unzip -t "${TEMP}/besu-${VERSION}.zip"
+
+echo "Calculating new hash..."
+HASH=`shasum -a 256 ${TEMP}/besu-${VERSION}.zip | cut -d ' ' -f 1`
+
+cat > besu.rb <<EOF
+class Besu < Formula
+  desc "hyperledger besu ethereum client"
+  homepage "https://github.com/hyperledger/besu"
+  url "${URL}"
+  # update with: ./updateBesu.sh <new-version>
+  sha256 "${HASH}"
+
+  depends_on :java => "11+"
+
+  def install
+    prefix.install "lib"
+    bin.install "bin/besu"
+  end
+
+  test do
+    system "#{bin}/besu" "--version"
+  end
+end
+EOF
+
+echo "New url: ${URL}"
+echo "New hash: ${HASH}"
+echo "Success.  Commit the changes to besu.rb to release."