Jenkins Pipeline and Docker - how to archive files from container

Question

According to Jenkins Pipeline Docs, I should be able to use pipeline steps while working with Docker. However, "archiveArtifacts" does not appear to work:

    def container = docker.image("some_image")
    container.inside {
        sh 'date > /tmp/test.txt'
        sh 'cat /tmp/test.txt' //works, shows file

        def fileContents = readFile '/tmp/test.txt' //works
        echo "Contents: ${fileContents}" //works, shows file

        archiveArtifacts '/tmp/*.txt' //FAILS
    }

"ERROR: No artifacts found that match the file pattern "/tmp/*.txt". Configuration error?".

Things I've tried:

• Adding sync and sleep(5) before the archive step in case this is a file sync issue.
• Trying to archive '/*' and '*' in case it's running on the host (same error).

Any suggestions on archiving files generated in a Docker container?

PS: I opened a bug report... It looks like archiveArtifacts will only work on files in $WORKSPACE in docker containers.

Answer 1

You seem to have found the solution as reported in the same Jira ticket so I'll post here for everyone:

this works fine:

def image = docker.image("alpine")
 image.inside { 
   sh 'date > /tmp/test.txt'
   sh "cp /tmp/test.txt ${WORKSPACE}"
   archiveArtifacts 'test.txt'
 }