Initial CI Build Refactor (#962)

Simplified the `travis` configuration back to it's minimal form to create
a new starting point.

* Adding Explicit Deploy stage
* Updating documentation and adding tagging to the release script
* Adding tag configuration to pom
* Configured Travis to Skip the commits created when preparing the release
* Adding Git Credentials
* Added Sync Stage during releases

Author: kdavisk6

.travis.yml

@@ -1,10 +1,15 @@
-# Run `travis lint` when changing this file to avoid breaking the build.
-# Default JDK is really old: 1.8.0_31; Trusty's is less old: 1.8.0_51
-# https://docs.travis-ci.com/user/ci-environment/#Virtualization-environments
-dist: trusty
+dist: xenial
 sudo: false
 language: java
-jdk: oraclejdk8
+
+cache:
+  directories:
+    - $HOME/.m2
+
+jdk:
+  - openjdk8
+  - openjdk11
+
 before_install:
   # Parameters used during release
   - git config user.name "$GH_USER"
@@ -13,35 +18,30 @@ before_install:
   - git config credential.helper "store --file=.git/credentials"
   - echo "https://$GH_TOKEN:@github.com" > .git/credentials
 
-install:
-  # Override default travis to use the maven wrapper
-  - ./mvnw install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
-
-script:
-  - ./travis/publish.sh
-
-cache:
-  directories:
-    - $HOME/.m2
-
-matrix:
+jobs:
   include:
-    - os: linux
-      jdk: oraclejdk8
-      addons:
-        apt:
-          packages:
-            - oracle-java8-installer
-    - os: linux
+    - stage: snapshot
+      name: "Deploy Snapshot to JCenter"
+      if: branch = master AND type != pull_request
       jdk: openjdk8
-    - os: linux
-      jdk: openjdk11
-
-# Don't build release tags. This avoids publish conflicts because the version commit exists both on master and the release tag.
-# See https://github.com/travis-ci/travis-ci/issues/1532
-branches:
-  except:
-    - /^[0-9]/
+      install: true
+      script:
+        - ./mvnw -B -nsu -s ./travis/settings.xml -P release -pl -:feign-benchmark -DskipTests=true deploy
+    - stage: release
+      name: "Release to JCenter"
+      if: tag =~ /^[0-9\.]$/
+      jdk: openjdk8
+      install: true
+      script:
+        - ./mvnw -B -nsu -s ./travis/settings.xml -P release -pl -:feign-benchmark -DskipTests=true deploy
+    - stage: sync
+      name: "Sync with Maven Central"
+      if: tag =~ /^[0-9\.]$/
+      jdk: openjdk8
+      install: true
+      script:
+        # this step can take an inordinate amount of time, so the wait should push it to 30 minutes
+        - travis_wait 30 ./mvnw -B -nsu -s ./travis/settings.xml -N io.zipkin.centralsync-maven-plugin:centralsync-maven-plugin:sync
 
 env:
   global:

RELEASE.md

@@ -10,12 +10,16 @@ This repo uses [semantic versions](http://semver.org/). Please keep this in mind
 
 1. **Push a git tag**
 
-   The tag should be of the format `release-N.M.L`, for example `release-8.18.0`.
+   Prepare the next release by running the [release script](travis/release.sh) from a clean checkout of the master branch.
+   This script will:
+   * Update all versions to the next release.
+   * Tag the release.
+   * Update all versions to the next development version.
 
 1. **Wait for Travis CI**
 
-   This part is controlled by [`travis/publish.sh`](travis/publish.sh). It creates a couple commits, bumps the version,
-   publishes artifacts, syncs to Maven Central.
+   This part is controlled by the [travis configuration](.travis.yml), specifically the `release` stage.  Which
+   creates the release artifacts and deploys them to maven central.
 
 ## Credentials
 

pom.xml

@@ -88,6 +88,8 @@
     <maven-surefire-plugin.version>2.22.0</maven-surefire-plugin.version>
     <bom-generator.version>0.14.3</bom-generator.version>
     <bom.template.file.path>file://${project.basedir}/src/config/bom.xml</bom.template.file.path>
+    <maven-scm-plugin.version>1.11.2</maven-scm-plugin.version>
+    <maven-versions-plugin.version>2.7</maven-versions-plugin.version>
   </properties>
   <url>https://github.com/openfeign/feign</url>
   <inceptionYear>2012</inceptionYear>
@@ -129,6 +131,11 @@
       <email>velo br at gmail dot com</email>
       <url>about.me/velo</url>
     </developer>
+    <developer>
+      <id>kdavisk6</id>
+      <name>Kevin Davis</name>
+      <email>kdavisk6@gmail.com</email>
+    </developer>
   </developers>
 
   <distributionManagement>
@@ -596,6 +603,19 @@
           </dependency>
         </dependencies>
       </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>versions-maven-plugin</artifactId>
+        <version>${maven-versions-plugin.version}</version>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-scm-plugin</artifactId>
+        <version>${maven-scm-plugin.version}</version>
+        <configuration>
+          <tag>${project.version}</tag>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 

travis/release.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+#
+# Copyright 2012-2019 The Feign Authors
+#
+# 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.
+#
+
+function increment() {
+  local version=$1
+  result=`echo ${version} | awk -F. -v OFS=. 'NF==1{print ++$NF}; NF>1{if(length($NF+1)>length($NF))$(NF-1)++; $NF=sprintf("%0*d", length($NF), ($NF+1)%(10^length($NF))); print}'`
+  echo "${result}-SNAPSHOT"
+}
+
+# extract the release version from the pom file
+version=`./mvnw -o help:evaluate -N -Dexpression=project.version | sed -n '/^[0-9]/p'`
+tag=`echo ${version} | cut -d'-' -f 1`
+
+# determine the next snapshot version
+snapshot=$(increment ${tag})
+
+echo "release version is: ${tag} and next snapshot is: ${snapshot}"
+
+# Update the versions, removing the snapshots, then create a new tag for the release, this will
+# start the travis-ci release process.
+./mvnw -B versions:set scm:checkin -DremoveSnapshot -DgenerateBackupPoms=false -Dmessage="[travis skip] prepare release ${tag}" -DpushChanges=false
+
+# tag the release
+echo "pushing tag ${tag}"
+./mvnw scm:tag -DpushChanges=false
+
+# Update the versions to the next snapshot
+./mvnw -B versions:set scm:checkin -DnewVersion="${snapshot}" -DgenerateBackupPoms=false -Dmessage="[travis skip] updating versions to next development iteration ${snapshot}" -DpushChanges=false