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The Jenkins DevOps pipeline is defined in a “Jenkinsfile” (by default named Jenkinsfile ) and has the following structure (most detail omitted). Paired curly braces ”{ }" denote the start and end of a scoped section. Comments are “/* */” (inline) or “//” (til end of line)
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pipeline { /* outermost scope */
agent { ... } /* where will this run? */
parameters { ... } /* What is it being fed? */
environment { ... } /* what other variables are needed? */
stages { /* operational container */
stage { ... } /* first sequence of steps */
stage { ... } /* next */
...
} /* end of stages */
} // end of pipeline |
To understand these sections in more detail, refer to your Jenkins documentation. We present only the MettleCI specific things you need to know. Note that Jenkins offers flexibility in where some of these sections are placed, and in some cases, allows repetition at different scopes. (The {} are scope delimiters.) Note also that there are additional things you could put in to just about every section, and that some sections may be repeated at a given scope level.
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The parameters section enumerates the parameters to the pipeline with their default values. The four parameters used in the template, and their meanings are discussed in Deploying a Jenkins Pipeline /wiki/spaces/MCIDOC/pages/2244149249
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note that parameters are immutable, and once set at pipeline (or scope section) start, cannot be changed. |
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parameters {
string(name: 'domainName', defaultValue: 'demo4-svcs.datamigrators.io:59445', description: 'DataStage Service Tier')
string(name: 'serverName', defaultValue: 'demo4-engn.datamigrators.io', description: 'DataStage Engine Tier')
string(name: 'projectName', defaultValue: 'wwi_jenkins_ds117', description: 'Logical (unsuffixed) Project Name')
string(name: 'environmentId', defaultValue: 'ci', description: 'Environment Identifer')
} |
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These will be visible in the execution environment as environment variables, and thus will be available to batch files, external commands, and the like without needing to explicitly pass them.
Environment variables can be further manipulated in the same or subsequent environment{} section(s), unlike parameters which, once obtained, cannot be changed
Stages Section
The stages section is a container for an arbitrary number of individual stages, which are normally run in sequence. In the template pipeline there are three, “Deploy”, “Test”, and “Promote”
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This is the first stage in the pipeline and it is tasked with deploying changed project assets to the CI (continuous integration) project. WithCredentialsprovides appropriate credentials (using the credentials plugin) to the rest of the steps. change from mci-user if you are using a different user. Each bat step invokes the MettleCI CLI to perform one of the deployment tasks. Refer to the MettleCI CLI Command Reference for details of what each step is doing. The label, chosen to be descriptive of the step task, becomes the step text in the Blue Ocean display of the pipeline. If a step aborts that ends the steps part of the stage. After the steps conclude, by error or by reaching the end, the post section is evaluated. Although there are other values such as changed, fixed, etc, using always ensures the section is always executed to process test results (here, the result of the compilations) and then cleanup.
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stages { stage("Deploy") { steps { withCredentials([usernamePassword(credentialsId: 'mci-user', passwordVariable: 'datastagePassword', usernameVariable: 'datastageUsername')]) { bat label: 'Create DataStage Project', script: "${env.METTLE_SHELL} datastage create-project -domain ${params.domainName} -server ${params.serverName} -project ${env.DATASTAGE_PROJECT} -username ${datastageUsername} -password ${datastagePassword}" bat label: 'Substitute parameters in DataStage config', script: "${env.METTLE_SHELL} properties config -baseDir datastage -filePattern \"*.sh\" -filePattern \"DSParams\" -filePattern \"Parameter Sets/*/*\" -filePattern \"*.apt\" -properties var.${params.environmentId} -outDir config" bat label: 'Transfer DataStage config and filesystem assets', script: "${env.METTLE_SHELL} remote upload -host ${params.serverName} -username ${datastageUsername} -password ${datastagePassword} -transferPattern \"filesystem/**/*,config/*\" -destination \"${env.DATASTAGE_PROJECT}\"" bat label: 'Deploy DataStage config and file system assets', script: "${env.METTLE_SHELL} remote execute -host ${params.serverName} -username ${datastageUsername} -password ${datastagePassword} -script \"config\\deploy.sh\"" bat label: 'Deploy DataStage project', script: "${env.METTLE_SHELL} datastage deploy -domain ${params.domainName} -server ${params.serverName} -project ${env.DATASTAGE_PROJECT} -username ${datastageUsername} -password ${datastagePassword} -assets datastage -parameter-sets \"config\\Parameter Sets\" -threads 8 -project-cache \"C:\\dm\\mci\\cache\\${params.serverName}\\${env.DATASTAGE_PROJECT}\"" } // end of withCredentials section } // end of steps in this stage post { always { junit testResults: 'log/**/mettleci_compilation.xml', allowEmptyResults: true withCredentials([usernamePassword(credentialsId: 'mci-user', passwordVariable: 'datastagePassword', usernameVariable: 'datastageUsername')]) { bat label: 'Cleanup temporary files', script: "${env.METTLE_SHELL} remote execute -host ${params.serverName} -username ${datastageUsername} -password ${datastagePassword} -script \"config\\cleanup.sh\"" } // end of things to "always" perform } // end of post steps section } // end of deploy stage } |
Test stage and parallel Static Analysis and Unit Tests substages
After a successful deployment the pipeline will perform some tests, compliance and the unit tests. These can be performed in parallel as there is no interdependence, so we use the parallel{} construct to nest the stage invocations. As before, refer to the MettleCI CLI Command Reference for details of what each step is doing.
Compliance testing is relatively simple, requiring only a single step to run the rules with no cleanup, and subsequent collection of the results. Unit tests are a bit more involved with upload of the specs, execution of the jobs in test mode, and downloading the reports followed again by collection of results
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stage("Test") { parallel { stage('Static Analysis') { steps { bat label: 'Perform static analysis', script: "${env.METTLE_SHELL} compliance test -assets datastage -report \"compliance_report.xml\" -junit -rules compliance\\WORKBENCH -project-cache \"C:\\dm\\mci\\cache\\${params.serverName}\\${env.DATASTAGE_PROJECT}\"" } // end of Static Analysis steps post { always { junit testResults: 'compliance_report.xml', allowEmptyResults: true } } // end of Static Analysis post steps actions } // end of Static Analysis }(sub)stage stage('Unit Tests') { steps { withCredentials([usernamePassword(credentialsId: 'mci-user', passwordVariable: 'datastagePassword', usernameVariable: 'datastageUsername')]) { bat label: 'Upload unit test specs', script: "${env.METTLE_SHELL} remote upload -host ${params.serverName} -username ${datastageUsername} -password ${datastagePassword} -source \"unittest\" -transferPattern \"**/*\" -destination \"/opt/dm/mci/specs/${env.DATASTAGE_PROJECT}\"" bat label: 'Execute unit tests for changed DataStage jobs', script: "${env.METTLE_SHELL} unittest test -domain ${params.domainName} -server ${params.serverName} -project ${env.DATASTAGE_PROJECT} -username ${datastageUsername} -password ${datastagePassword} -specs unittest -reports test-reports -project-cache \"C:\\dm\\mci\\cache\\${params.serverName}\\${env.DATASTAGE_PROJECT}\"" bat label: 'Retrieve unit test results', script: "${env.METTLE_SHELL} remote download -host ${params.serverName} -username ${datastageUsername} -password ${datastagePassword} -source \"/opt/dm/mci/reports\" -transferPattern \"${env.DATASTAGE_PROJECT}/**/*.xml\" -destination \"test-reports\"" } } // end of Unit Tests steps post { always { junit testResults: 'test-reports/**/*.xml', allowEmptyResults: true } } // end of Unit Test post steps actions } end of Unit Tests (sub)stage } // end of parallel stage container construct } // end of Test (super)stage |
Some notes:
The template assumes the compliance rules are in the same repo. If one wishes to source the rules from a different repo and further, to run separate warn/fail sets of tests, presenting the result in one report, the static analysis stage would look like this instead: (refer to Jenkins documentation to understand the parameters in the checkout plugin invocation)
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stage('Static Analysis') {
steps {
checkout([
$class: 'GitSCM',
branches: [[name: 'refs/heads/master']],
doGenerateSubmoduleConfigurations: false,
extensions: [[$class: 'RelativeTargetDirectory', relativeTargetDir: 'compliance2']],
submoduleCfg: [],
userRemoteConfigs: [[ credentialsId: 'lar_at_demo_mettleci_i0', url: 'http://lar@demo.mettleci.io/bitbucket/scm/cr/compliance-rules.git' ]]
])
bat label: 'Perform static analysis for non fatal violations', script: "${env.METTLE_SHELL} compliance test -assets datastage -report \"compliance_report_warn.xml\" -junit -test-suite \"warnings\" -ignore-test-failures -rules compliance2\\WARN -project-cache \"C:\\dm\\mci\\cache\\${params.serverName}\\${env.DATASTAGE_PROJECT}\""
bat label: 'Perform static analysis for fatal violations', script: "${env.METTLE_SHELL} compliance test -assets datastage -report \"compliance_report_fail.xml\" -junit -test-suite \"failures\" -rules compliance2\\FAIL -project-cache \"C:\\dm\\mci\\cache\\${params.serverName}\\${env.DATASTAGE_PROJECT}\""
}
post {
always {
junit testResults: 'compliance_report_*.xml', allowEmptyResults: true
}
}
} |
Promotion stage with
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three parallel deployment substages
The template pipeline has two/ three promotion deployments, each of which is essentially the same as the initial deploy but directed at a different project. Our template assumes that all three deployments are to the same DataStage server, but the parameter blocks are at the individual promotion level so you can change these as necessary. You can reduce or increase (by deleting or copying code blocks) the number as necessary. These can be performed in parallel as there is no interdependence, so we again use the parallel{} construct to nest the stage invocations. As before, refer to the MettleCI CLI Command Reference for details of what each step is doing. The “innards” of each promotion step, save the first are elided in the following code snippet to focus on the structure.
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