Add custom docker run flags

Drone Support
1

It seems that running a build container with custom option such as docker run --ulimits should be supported by the cncd package, but including the ulimits key in my .drone.yml is not actually modifying the limits in the container.

pipeline:
  build:
    image: node:8-alpine
    ulimits:
      stack:
        soft: 10000
        hard: 40000
      nofile:
        soft: 10000
        hard: 40000
    commands:
      - apk add --quiet --no-cache openjdk8-jre
      - npm ci
      - ulimit -n
      - ulimit -s
      - npm test
    when:
      event: [ push, pull_request ]

output from running the build

+ ulimit -n
1048576
+ ulimit -s
8192

Does anyone have insight here? network_mode does seem to work although it’s not documented anywhere. If these are meant to be legitimate keys in the drone config file, they we should document them.

2

Do all the options listed here work? https://github.com/cncd/pipeline/blob/b03959913369b4e2a6c49be514f52d076ef6b172/pipeline/frontend/yaml/container_test.go

3

After a little bit of experimentation it seems like most of the options except for ulimits do work. Is it impossible to modify the limits for a docker run in drone? I’m trying to run openjdk8-jre and execute a jar for testing in an alpine container. I’m running into a segmentation fault. It might be a problem with the JRE itself, but thought that the stack limit might be then problem.

-f: file size (blocks)             unlimited
-t: cpu time (seconds)             unlimited
-d: data seg size (kb)             unlimited
-s: stack size (kb)                8192
-c: core file size (blocks)        unlimited
-m: resident set size (kb)         unlimited
-l: locked memory (kb)             64
-p: processes                      unlimited
-n: file descriptors               1048576
-v: address space (kb)             unlimited
-w: locks                          unlimited
-e: scheduling priority            0
-r: real-time priority             0```