Build: Publish SNAPSHOT releases

.github/workflows/publish-snapshot.yml

@@ -0,0 +1,37 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+
+name: "Publish Snapshot to Maven"
+on:
+  schedule:
+    # * is a special character in YAML so you have to quote this string
+    # this schedules a workflow to run at specific UTC times using POSIX cron syntax -> https://crontab.guru/
+    # we're publishing a new snapshot every night at 00:00 UTC
+    - cron:  '0 0 * * *'
+
+jobs:
+  publish-snapshot:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - run: |
+          ./gradlew publishApachePublicationToMavenRepository -PmavenUser=${{ secrets.NEXUS_USER }} -PmavenPassword=${{ secrets.NEXUS_PW }}

build.gradle

@@ -18,6 +18,8 @@
  */
 
 import groovy.transform.Memoized
+import java.util.regex.Matcher
+import java.util.regex.Pattern
 
 buildscript {
   repositories {
@@ -557,7 +559,7 @@ project(':iceberg-nessie') {
 }
 
 @Memoized
-boolean isVersionFileExists() {
+boolean versionFileExists() {
   return file('version.txt').exists()
 }
 
@@ -567,19 +569,28 @@ String getVersionFromFile() {
 }
 
 String getProjectVersion() {
-  if (isVersionFileExists()) {
+  if (versionFileExists()) {
     return getVersionFromFile()
   }
 
   try {
-    return gitVersion()
-  } catch (NullPointerException e) {
-    throw new Exception("Neither version.txt nor git version exists")
+    // we're fetching the version from the latest tag (prefixed with 'release-base-'),
+    // which can look like this: '0.13.0-2-g805400f0.dirty' but we're only interested in the MAJOR.MINOR.PATCH part
+    String version = gitVersion(prefix: 'release-base-')
+    Pattern pattern = Pattern.compile("^([0-9]+)\\.([0-9]+)\\.([0-9]+)(.*)?\$")
+    Matcher matcher = pattern.matcher(version)
+    if (matcher.matches()) {
+      // bump the MINOR version and always set the PATCH version to 0
+      return matcher.group(1) + "." + (Integer.valueOf(matcher.group(2)) + 1) + ".0-SNAPSHOT"
+    }
+    return version
+  } catch (Exception e) {
+    throw new Exception("Neither version.txt nor git version exists: " + e.getMessage(), e)
   }
 }
 
 String getJavadocVersion() {
-  if (isVersionFileExists()) {
+  if (versionFileExists()) {
     return getVersionFromFile()
   }