Adds Kokoro build scripts. (GoogleCloudPlatform#69)

* Adds Kokoro build scripts.

* Changes to use gradle-release plugin.

build.gradle

@@ -10,16 +10,16 @@ buildscript {
     }
   }
   dependencies {
-    classpath 'com.bmuschko:gradle-nexus-plugin:2.3.1'
     classpath 'gradle.plugin.com.github.sherter.google-java-format:google-java-format-gradle-plugin:0.6'
+    classpath 'net.researchgate:gradle-release:2.6.0'
   }
 }
 
 repositories {
   mavenCentral()
 }
 
-apply from: 'scripts/publishing.gradle'
+apply from: 'scripts/releasing.gradle'
 apply from: 'scripts/google-java-format.gradle'
 apply from: 'scripts/checkstyle.gradle'
 
@@ -52,6 +52,13 @@ jar {
   }
 }
 
+test {
+  testLogging {
+    showStandardStreams = true
+    exceptionFormat = 'full'
+  }
+}
+
 task wrapper(type: Wrapper) {
   gradleVersion = '4.0'
 }

kokoro/release_build.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Fail on any error.
+set -e
+# Display commands to stderr.
+set -x
+
+cd github/endpoints-framework-gradle-plugin
+./gradlew check prepareRelease

kokoro/release_publish.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+# Fail on any error.
+set -e
+
+CREDENTIALS="$SONATYPE_USERNAME:$SONATYPE_PASSWORD"
+
+# Display commands to stderr.
+set -x
+
+# Goes to the GCS directory.
+cd $KOKORO_GFILE_DIR
+
+# Finds the latest ubuntu/release-sign build directory.
+LAST_BUILD=$(ls prod/endpoints-framework-gradle-plugin/ubuntu/release-sign/ | sort -rV | head -1)
+
+# Finds the bundled jar file in the latest signed artifact directory.
+BUNDLED_JAR_FILE=$(find `pwd`/prod/endpoints-framework-gradle-plugin/ubuntu/release-sign/${LAST_BUILD}/* -type f \( -iname \*-bundle.jar \))
+
+# Usage: GetSessionID <variable name>
+# Uses the environment variable CREDENTIALS.
+# Stores the Nexus session ID in the given variable.
+GetSessionID() {
+	local __resultvar=$1
+
+	# Makes a temporary file to store the login cookies.
+	local cookies_temp=$(mktemp /tmp/sonatype_cookies.XXXXXXX)
+
+	# Sends a login request.
+	{ local login_response=$(curl 'https://oss.sonatype.org/service/local/authentication/login' -X 'GET' -u "$CREDENTIALS" -c $cookies_temp 2> /dev/null); } 2> /dev/null
+
+	# Checks if login was successful.
+	echo $login_response | grep -q '<loggedIn>true</loggedIn>'
+
+	local login_check=$(echo -n $?)
+
+	if [ "$login_check" -eq "1" ]; then
+		return 1
+	fi
+
+	# Extracts the session ID from the cookies.
+	local nxsessionid
+	local nxsessionid_line=$(cat $cookies_temp | grep 'NXSESSIONID')
+	nxsessionid=$(echo -n $nxsessionid_line | awk '{print $NF}')
+
+	eval $__resultvar="'$nxsessionid'"
+}
+
+# Usage: UploadJAR <session ID> <file>
+# Uploads the bundled JAR file to the Nexus Staging Repository.
+UploadJAR() {
+	curl 'https://oss.sonatype.org/service/local/staging/bundle_upload' -H "Cookie: NXSESSIONID=$1" -H 'Content-Type: multipart/form-data' --compressed -F "file=@$2"
+}
+
+# Gets the session ID.
+GetSessionID NXSESSIONID
+if [ $? -eq 1 ]; then
+	echo 'Login failed!'
+	exit 1
+fi
+echo 'Login successful.'
+
+# Uploads the bundled JAR file.
+echo 'Uploading artifact...'
+UploadJAR $NXSESSIONID $BUNDLED_JAR_FILE
+
+# TODO: Release on Sonatype.

kokoro/release_sign.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# Fail on any error.
+set -e
+# Display commands being run.
+set -x
+
+cd $KOKORO_GFILE_DIR
+mkdir signed && chmod 777 signed
+
+# find the latest directory under prod/endpoints-framework-gradle-plugin/gcp_ubuntu/release-build/
+LAST_BUILD=$(ls prod/endpoints-framework-gradle-plugin/gcp_ubuntu/release-build/ | sort -rV | head -1)
+
+# find the jars and the pom in the latest build artifact directory
+FILES=$(find `pwd`/prod/endpoints-framework-gradle-plugin/gcp_ubuntu/release-build/${LAST_BUILD}/* -type f \( -iname \*.jar -o -iname \*.pom \))
+
+for f in $FILES
+do
+  echo "Processing $f file..."
+  filename=$(basename "$f")
+  mv $f signed/$filename
+  if /escalated_sign/escalated_sign.py -j /escalated_sign_jobs -t linux_gpg_sign \
+    `pwd`/signed/$filename
+  then echo "Signed $filename"
+  else
+    echo "Could not sign $filename"
+    exit 1
+  fi
+done
+
+# bundle the artifacts for manual deploy to the Maven staging repository
+cd signed
+POM_NAME=$(ls *.pom)
+BUNDLE_NAME=${POM_NAME%.pom}-bundle.jar
+jar -cvf ${BUNDLE_NAME} *

scripts/releasing.gradle

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2017 Google Inc. All Right Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// This script contains
+// 1. The release builder (for building releasable bundles)
+// 2. The release helper (for git tagging and version automation)
+
+// Release builder (provides prepareRelease script)
+apply plugin: 'maven'
+
+task sourceJar(type: Jar) {
+    from sourceSets.main.allJava
+    classifier 'sources'
+}
+
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    from javadoc.destinationDir
+    classifier = 'javadoc'
+}
+
+task writePom {
+    project.afterEvaluate {
+        def outputFile = file("$buildDir/pom/${project.name}-${project.version}.pom")
+        outputs.file outputFile
+
+        doLast {
+            pom {
+                project {
+                    name 'Endpoints Framework Gradle Plugin'
+                    description 'This Gradle plugin provides tasks and configurations to generate Google Cloud Endpoints Framework client code and discovery docs'
+                    url 'https://github.com/GoogleCloudPlatform/endpoints-framework-gradle-plugin'
+                    inceptionYear '2016'
+
+                    scm {
+                        url 'https://github.com/GoogleCloudPlatform/endpoints-framework-gradle-plugin'
+                        connection 'scm:https://github.com/GoogleCloudPlatform/endpoints-framework-gradle-plugin.git'
+                        developerConnection 'scm:git://github.com/GoogleCloudPlatform/endpoints-framework-gradle-plugin.git'
+                    }
+
+                    licenses {
+                        license {
+                            name 'The Apache Software License, Version 2.0'
+                            url 'http://www.apache.org/licenses/LICENSE-2.0.txt'
+                            distribution 'repo'
+                        }
+                    }
+
+                    developers {
+                        developer {
+                            id 'loosebazooka'
+                            name 'Appu Goundan'
+                            email '[email protected]'
+                        }
+                    }
+                }
+            }.writeTo(outputFile)
+        }
+    }
+}
+
+task prepareRelease(type: Copy) {
+    from jar
+    from sourceJar
+    from javadocJar
+    from writePom
+
+    into "${buildDir}/release-artifacts"
+
+    dependsOn build
+    dependsOn cleanPrepareRelease
+}
+
+// Release helper (git release commits and version updates)
+apply plugin: 'net.researchgate.release'
+
+release {
+    tagTemplate = 'v$version'
+    git {
+        requireBranch = /^release_v\d+.*$/  //regex
+    }
+}