Make commit of new version optional in artifactSetVersion step (#112)

* Make commit of new version optional in `artifactSetVersion` step

You might not want to add a new commit for each version, when versions
are automatically created. This commit makes this feature optional, but
enabled by default to maintain API compatibility.

* Set `gitCommitId` if null

* Improve documentation of `commitVersion` parameter

* Allow to operate in a code checkout without `.git` directory

documentation/docs/steps/artifactSetVersion.md

@@ -9,7 +9,10 @@ The version generated using this step will contain:
 * Timestamp
 * CommitId (by default the long version of the hash)
 
-After conducting automatic versioning the new version is pushed as a new tag into the source code repository (e.g. GitHub)
+Optionally, but enabled by default, the new version is pushed as a new tag into the source code repository (e.g. GitHub).
+If this option is chosen, git credentials and the repository URL needs to be provided.
+Since you might not want to configure the git credentials in Jenkins, committing and pushing can be disabled using the `commitVersion` parameter as described below.
+If you require strict reproducibility of your builds, this should be used.
 
 ## Prerequsites
 none
@@ -20,13 +23,14 @@ none
 | ----------|-----------|---------|-----------------|
 | script | no | empty `commonPipelineEnvironment` |  |
 | buildTool | no | maven | maven, docker |
+| commitVersion | no | `true` | `true`, `false` |
 | dockerVersionSource | no  | `''`  | FROM, (ENV name),appVersion  |
 | filePath | no | buildTool=`maven`: pom.xml <br />docker: Dockerfile |   |
 | gitCommitId |  no | `GitUtils.getGitCommitId()`   |   |
-| gitCredentialsId |  yes | as defined in custom configuration  |   |
+| gitCredentialsId |  If `commitVersion` is `true` | as defined in custom configuration  |   |
 | gitUserEMail | no |  |   |
 | gitUserName | no |   |   |
-| gitSshUrl | yes  |  |   |
+| gitSshUrl | If `commitVersion` is `true` |  |   |
 | tagPrefix | no  | 'build_'  |   |
 | timestamp | no  |  current time in format according to `timestampTemplate`  |   |
 | timestampTemplate | no | `%Y%m%d%H%M%S` |   |
@@ -34,6 +38,7 @@ none
 
 * `script` defines the global script environment of the Jenkinsfile run. Typically `this` is passed to this parameter. This allows the function to access the [`commonPipelineEnvironment`](commonPipelineEnvironment.md) for retrieving e.g. configuration parameters.
 * `buildTool` defines the tool which is used for building the artifact.
+* `commitVersion` controls if the changed version is committed and pushed to the git repository. If this is enabled (which is the default), you need to provide `gitCredentialsId` and `gitSshUrl`.
 * `dockerVersionSource` specifies the source to be used for the main version which is used for generating the automatic version.
 
     * This can either be the version of the base image - as retrieved from the `FROM` statement within the Dockerfile, e.g. `FROM jenkins:2.46.2`
@@ -53,6 +58,7 @@ Following parameters can also be specified as step parameters using the global c
 
 * `artifactType`
 * `buildTool`
+* `commitVersion`
 * `dockerVersionSource`
 * `filePath`
 * `gitCredentialsId`

resources/default_pipeline_environment.yml

@@ -7,6 +7,7 @@ steps:
   artifactSetVersion:
     timestampTemplate: '%Y%m%d%H%M%S'
     tagPrefix: 'build_'
+    commitVersion: true
     maven:
       filePath: 'pom.xml'
       versioningTemplate: '${version}-${timestamp}${commitId?"_"+commitId:""}'

src/com/sap/piper/GitUtils.groovy

@@ -1,6 +1,12 @@
 package com.sap.piper
 
-import com.cloudbees.groovy.cps.NonCPS
+def getGitCommitIdOrNull() {
+    if (fileExists('.git')) {
+        return sh(returnStdout: true, script: 'git rev-parse HEAD').trim()
+    } else {
+        return null
+    }
+}
 
 def getGitCommitId() {
     return sh(returnStdout: true, script: 'git rev-parse HEAD').trim()

test/groovy/ArtifactSetVersionTest.groovy

@@ -6,13 +6,7 @@ import org.junit.Rule
 import org.junit.Test
 import org.junit.rules.ExpectedException
 import org.junit.rules.RuleChain
-import util.JenkinsLoggingRule
-import util.JenkinsReadMavenPomRule
-import util.JenkinsShellCallRule
-import util.JenkinsWriteFileRule
-import util.JenkinsStepRule
-import util.JenkinsEnvironmentRule
-import util.Rules
+import util.*
 
 import static org.junit.Assert.assertEquals
 
@@ -51,6 +45,8 @@ class ArtifactSetVersionTest extends BasePipelineTest {
 
         gitUtils = new GitUtils()
         prepareObjectInterceptors(gitUtils)
+
+        this.helper.registerAllowedMethod('fileExists', [String.class], {true})
     }
 
     @Test
@@ -68,6 +64,14 @@ class ArtifactSetVersionTest extends BasePipelineTest {
         assertEquals ("git push origin build_1.2.3-20180101010203_testCommitId", jscr.shell[8])
     }
 
+    @Test
+    void testVersioningWithoutCommit() {
+        jsr.step.call(script: [commonPipelineEnvironment: jer.env], juStabGitUtils: gitUtils, buildTool: 'maven', commitVersion: false)
+
+        assertEquals('1.2.3-20180101010203_testCommitId', jer.env.getArtifactVersion())
+        assertEquals('mvn versions:set -DnewVersion=1.2.3-20180101010203_testCommitId --file pom.xml', jscr.shell[3])
+    }
+
     @Test
     void testVersioningCustomGitUserAndEMail() {
         jsr.step.call(script: [commonPipelineEnvironment: jer.env], juStabGitUtils: gitUtils, buildTool: 'maven', gitSshUrl: 'myGitSshUrl', gitUserEMail: 'test@test.com', gitUserName: 'test')

test/groovy/com/sap/piper/GitUtilsTest.groovy

@@ -6,12 +6,12 @@ import org.junit.Rule
 import org.junit.Test
 import org.junit.rules.ExpectedException
 import org.junit.rules.RuleChain
-import util.JenkinsReadMavenPomRule
 import util.JenkinsShellCallRule
+import util.MockHelper
 import util.Rules
-import util.SharedLibraryCreator
 
 import static org.junit.Assert.assertEquals
+import static org.junit.Assert.assertNull
 
 class GitUtilsTest extends BasePipelineTest {
 
@@ -27,6 +27,7 @@ class GitUtilsTest extends BasePipelineTest {
     void init() throws Exception {
         gitUtils = new GitUtils()
         prepareObjectInterceptors(gitUtils)
+        gitUtils.fileExists = MockHelper
 
         jscr.setReturnValue('git rev-parse HEAD', 'testCommitId')
     }
@@ -39,9 +40,14 @@ class GitUtilsTest extends BasePipelineTest {
 
     @Test
     void testGetGitCommitId() {
+        this.helper.registerAllowedMethod('fileExists', [String.class], {true})
+        assertEquals('testCommitId', gitUtils.getGitCommitIdOrNull())
+    }
 
-        assertEquals('testCommitId', gitUtils.getGitCommitId())
-
+    @Test
+    void testGetGitCommitIdNotAGitRepo() {
+        this.helper.registerAllowedMethod('fileExists', [String.class], {false})
+        assertNull(gitUtils.getGitCommitIdOrNull())
     }
 
 }

vars/artifactSetVersion.groovy

@@ -15,8 +15,10 @@ def call(Map parameters = [:]) {
             gitUtils = new GitUtils()
         }
 
-        if (sh(returnStatus: true, script: 'git diff --quiet HEAD') != 0)
-            error "[${stepName}] Files in the workspace have been changed previously - aborting ${stepName}"
+        if (fileExists('.git')) {
+            if (sh(returnStatus: true, script: 'git diff --quiet HEAD') != 0)
+                error "[${stepName}] Files in the workspace have been changed previously - aborting ${stepName}"
+        }
 
         def script = parameters.script
         if (script == null)
@@ -27,6 +29,7 @@ def call(Map parameters = [:]) {
         Set parameterKeys = [
             'artifactType',
             'buildTool',
+            'commitVersion',
             'dockerVersionSource',
             'filePath',
             'gitCommitId',
@@ -40,11 +43,12 @@ def call(Map parameters = [:]) {
             'versioningTemplate'
         ]
         Map pipelineDataMap = [
-            gitCommitId: gitUtils.getGitCommitId()
+            gitCommitId: gitUtils.getGitCommitIdOrNull()
         ]
         Set stepConfigurationKeys = [
             'artifactType',
             'buildTool',
+            'commitVersion',
             'dockerVersionSource',
             'filePath',
             'gitCredentialsId',
@@ -89,29 +93,30 @@ def call(Map parameters = [:]) {
 
         artifactVersioning.setVersion(newVersion)
 
-        sh 'git add .'
-
         def gitCommitId
 
-        sshagent([configuration.gitCredentialsId]) {
-            def gitUserMailConfig = ''
-            if (configuration.gitUserName  && configuration.gitUserEMail)
-                gitUserMailConfig = "-c user.email=\"${configuration.gitUserEMail}\" -c user.name \"${configuration.gitUserName}\""
+        if (configuration.commitVersion) {
+            sh 'git add .'
 
-            try {
-                sh "git ${gitUserMailConfig} commit -m 'update version ${newVersion}'"
-            } catch (e) {
-                error "[${stepName}]git commit failed: ${e}"
+            sshagent([configuration.gitCredentialsId]) {
+                def gitUserMailConfig = ''
+                if (configuration.gitUserName && configuration.gitUserEMail)
+                    gitUserMailConfig = "-c user.email=\"${configuration.gitUserEMail}\" -c user.name \"${configuration.gitUserName}\""
+
+                try {
+                    sh "git ${gitUserMailConfig} commit -m 'update version ${newVersion}'"
+                } catch (e) {
+                    error "[${stepName}]git commit failed: ${e}"
+                }
+                sh "git remote set-url origin ${configuration.gitSshUrl}"
+                sh "git tag ${configuration.tagPrefix}${newVersion}"
+                sh "git push origin ${configuration.tagPrefix}${newVersion}"
+
+                gitCommitId = gitUtils.getGitCommitIdOrNull()
             }
-            sh "git remote set-url origin ${configuration.gitSshUrl}"
-            sh "git tag ${configuration.tagPrefix}${newVersion}"
-            sh "git push origin ${configuration.tagPrefix}${newVersion}"
-
-            gitCommitId = gitUtils.getGitCommitId()
-
         }
 
-        if(buildTool == 'docker' && configuration.artifactType == 'appContainer') {
+        if (buildTool == 'docker' && configuration.artifactType == 'appContainer') {
             script.commonPipelineEnvironment.setAppContainerProperty('artifactVersion', newVersion)
             script.commonPipelineEnvironment.setAppContainerProperty('gitCommitId', gitCommitId)
         } else {
@@ -119,6 +124,7 @@ def call(Map parameters = [:]) {
             script.commonPipelineEnvironment.setArtifactVersion(newVersion)
             script.commonPipelineEnvironment.setGitCommitId(gitCommitId)
         }
+
         echo "[${stepName}]New version: ${newVersion}"
     }
 }