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  1. Jenkins
  2. JENKINS-70288

docker.inside(..) does not work with busybox top.

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      We are building docker images based on the Google distroless java images where the only non-JDK binaries are busybox symlinks.

      According to https://github.com/jenkinsci/docker-workflow-plugin/blob/master/src/main/java/org/jenkinsci/plugins/docker/workflow/client/DockerClient.java#L153 

       

      LaunchResult result = launch(launchEnv, false, "top", containerId, "-eo", "pid,comm");

      the way to get a list of processes currently running is to parse the output of "top -eo pid,comm".   

      The busybox `top` does not support this so it halts immediately and the container goes away with an IOException.

       

      ~ $ top -eo pid,comm
top: unrecognized option: e
BusyBox v1.34.1 (2022-04-13 00:26:55 UTC) multi-call binary.Usage: top [-bmH] [-n COUNT] [-d SECONDS]Show a view of process activity in real time.
Read the status of all processes from /proc each SECONDS
and show a screenful of them.
Keys:
        N/M/P/T: show CPU usage, sort by pid/mem/cpu/time
        S: show memory
        R: reverse sort
        H: toggle threads, 1: toggle SMP
        Q,^C: exit
Options:
        -b      Batch mode
        -n N    Exit after N iterations
        -d SEC  Delay between updates
        -m      Same as 's' key
        -H      Show threads

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            ravn ravn
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              Created:
              Updated: