chore: Update kokoro build script to push to Maven (#157)

* chore: update build script to push to Maven

* print out the current dir

* comment on the gpg keybox file

* add more mvn flags

Author: jihuin

.kokoro/release.cfg

@@ -2,6 +2,10 @@ build_file: "functions-framework-java/.kokoro/release.sh"
 
 before_action {
   fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 75669
+      keyname: "functions-framework-java-release-bot-gpg-pubring"
+    }
     keystore_resource {
       keystore_config_id: 75669
       keyname: "functions-framework-java-release-bot-gpg-passphrase"
@@ -11,4 +15,4 @@ before_action {
       keyname: "functions-framework-java-release-bot-sonatype-password"
     }
   }
-}
+}

.kokoro/release.sh

@@ -1,6 +1,65 @@
 #!/bin/bash
 
-# Make sure `JAVA_HOME` is set.
-echo "JAVA_HOME=$JAVA_HOME"
+# Get secrets from keystore and set and environment variables.
+setup_environment_secrets() {
+  export SONATYPE_USERNAME=functions-framework-release-bot
+  export SONATYPE_PASSWORD=$(cat ${KOKORO_KEYSTORE_DIR}/75669_functions-framework-java-release-bot-sonatype-password)
+  export GPG_PASSPHRASE=$(cat ${KOKORO_KEYSTORE_DIR}/75669_functions-framework-java-release-bot-gpg-passphrase)
+
+  # Add the keybox file to $GNUPGHOME to verify the GPG credentials.
+  export GNUPGHOME=/tmp/gpg
+  mkdir $GNUPGHOME
+  mv ${KOKORO_KEYSTORE_DIR}/75669_functions-framework-java-release-bot-gpg-pubring $GNUPGHOME/pubring.kbx
+}
+
+create_settings_xml_file() {
+  echo "<settings>
+   <profiles>
+     <profile>
+         <activation>
+             <activeByDefault>true</activeByDefault>
+         </activation>
+         <properties>
+             <gpg.passphrase>${GPG_PASSPHRASE}</gpg.passphrase>
+         </properties>
+     </profile>
+  </profiles>
+  <servers>
+    <server>
+      <id>sonatype-nexus-staging</id>
+      <username>${SONATYPE_USERNAME}</username>
+      <password>${SONATYPE_PASSWORD}</password>
+    </server>
+    <server>
+      <id>sonatype-nexus-snapshots</id>
+      <username>${SONATYPE_USERNAME}</username>
+      <password>${SONATYPE_PASSWORD}</password>
+    </server>
+  </servers>
+</settings>" > $1
+}
 
+setup_environment_secrets
+
+# Pick the right package to release based on the Kokoro job name.
+cd ${KOKORO_ARTIFACTS_DIR}/github/functions-framework-java
+create_settings_xml_file "settings.xml"
 echo "KOKORO_JOB_NAME=${KOKORO_JOB_NAME}"
+if [[ $KOKORO_JOB_NAME == *"function-maven-plugin"* ]]; then
+  cd function-maven-plugin
+elif [[ $KOKORO_JOB_NAME == *"functions-framework-api"* ]]; then
+  cd functions-framework-api
+else
+  cd invoker
+fi
+echo "pwd=$(pwd)"
+
+# Make sure `JAVA_HOME` is set and using jdk11.
+sudo update-java-alternatives --set java-1.11.0-openjdk-amd64
+echo "JAVA_HOME=$JAVA_HOME"
+mvn clean deploy -B \
+  -P sonatype-oss-release \
+  --settings=../settings.xml \
+  -Dgpg.executable=gpg \
+  -Dgpg.passphrase=${GPG_PASSPHRASE} \
+  -Dgpg.homedir=${GNUPGHOME}