[Declarative Pipeline] Using Dockerfile not in root of checkout

[Staffan Forsell]

I have an normal pipeline that looks like this:

#!groovy

node('docker_host') {

  stage("checkout") {

    p4sync credential: 'superSecretCred', depotPath: '//path'

  }

  def myEnv

  stage("docker build") {

    myEnv = docker.build("mytag", "utils/docker")

  }

  myEnv.inside {

    stage("build") {

      sh "./gradle"

    }

    } 

}

It builds a docker image and run the build stage in this image. The only non-standard stuff is that the Dockerfile is not in the root but in the "utils/docker" subdir to reduce the build context for docker.

I'm trying to convert this to a declarative pipeline but I can't find a way to get it to accept the Dockerfile in a separate dir. Normally this is done by adding the "utils/build" at the end of the docker build command.

My converted attempt looks like this:

pipeline {

  agent {

    label "docker_host"

  }

  stages {

    stage("Checkout") {

      steps {

        p4sync credential: 'superSecretCred', depotPath: '//path'

      }

    }

    stage("Echo world") {

      agent {

        dockerfile {

          label "docker_host"

          args "utils/docker"

          // dockerfile "utils/docker/Dockerfile"

        }

      }

      steps {

        sh "./gradle"

      }

    }

  }

}

This fails with 

java.io.IOException: java.io.FileNotFoundException: /jenkins/workspace/test-job-declarative@2/Dockerfile (No such file or directory)

at hudson.remoting.FastPipedInputStream.read(FastPipedInputStream.java:169)

at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)

at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)

at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)

at java.io.InputStreamReader.read(InputStreamReader.java:184)

at java.io.Reader.read(Reader.java:140)

at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2001)

at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1980)

at org.apache.commons.io.IOUtils.copy(IOUtils.java:1957)

at org.apache.commons.io.IOUtils.copy(IOUtils.java:1907)

at org.apache.commons.io.IOUtils.toString(IOUtils.java:778)

at org.apache.commons.io.IOUtils.toString(IOUtils.java:803)

at org.jenkinsci.plugins.workflow.steps.ReadFileStep$Execution.run(ReadFileStep.java:89)

at org.jenkinsci.plugins.workflow.steps.ReadFileStep$Execution.run(ReadFileStep.java:81)

at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)

at hudson.security.ACL.impersonate(ACL.java:221)

at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

at java.util.concurrent.FutureTask.run(FutureTask.java:262)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.io.FileNotFoundException: /jenkins/workspace/test-job-declarative@2/Dockerfile (No such file or directory)

at java.io.FileInputStream.open0(Native Method)

at java.io.FileInputStream.open(FileInputStream.java:195)

at java.io.FileInputStream.<init>(FileInputStream.java:138)

at hudson.FilePath$33.invoke(FilePath.java:1789)

at hudson.FilePath$33.invoke(FilePath.java:1782)

at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2772)

at hudson.remoting.UserRequest.perform(UserRequest.java:153)

at hudson.remoting.UserRequest.perform(UserRequest.java:50)

at hudson.remoting.Request$2.run(Request.java:332)

at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

... 1 more

Using the dockerfile closure, it's unclear if args is for the build command or the subsequent run command (my guess is the latter).

Anybody know a way to use a Dockerfile that's not in the root? Or is it not supported (yet)?

/Thanks Staffan

[Staffan Forsell]

Hmmm, of course I found https://issues.jenkins-ci.org/browse/JENKINS-41668 a couple of minutes later...

[Andrew Bayer]

I've got a PR up for this now - https://github.com/jenkinsci/pipeline-model-definition-plugin/pull/107

A.

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[Staffan Forsell]

Ok, thx. I will test it as soon as it's merged/released.

/S

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