Bug 1810185 - [4.2] Components using globs in Dockerfile COPY commands may break on OCP 4
Summary: [4.2] Components using globs in Dockerfile COPY commands may break on OCP 4
Keywords:
Status: CLOSED WORKSFORME
Alias: None
Product: OpenShift Container Platform
Classification: Red Hat
Component: Release
Version: 4.1.z
Hardware: Unspecified
OS: Unspecified
unspecified
urgent
Target Milestone: ---
: 4.2.z
Assignee: Ben Parees
QA Contact: Wei Sun
URL:
Whiteboard:
Depends On: 1810184
Blocks: 1810186
TreeView+ depends on / blocked
 
Reported: 2020-03-04 16:48 UTC by Adam Kaplan
Modified: 2020-06-05 19:03 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1810184
: 1810186 (view as bug list)
Environment:
Last Closed: 2020-06-05 19:03:26 UTC
Target Upstream Version:


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Github openshift cluster-kube-apiserver-operator pull 824 None closed [release 4-2] Bug 1810185: Components using globs in Dockerfile COPY commands may break on OCP 4 2020-06-05 18:59:08 UTC
Github openshift origin-aggregated-logging pull 1850 None closed [release-4.2] Bug 1810185: Modify Elasticsearch Dockerfile to mitigate issue with buildah 2020-06-05 18:59:08 UTC

Description Adam Kaplan 2020-03-04 16:48:07 UTC
This is a tracking bug for components that may not be able to immediately migrate their CI to 4.x clusters due a behavior skew between imagebuilder and buildah.

Docker has a longstanding bug using globs in COPY directives (i.e. COPY foo/dir/* /tmp/dir/ ). If the directory structure includes subdirectories, these subdirectories are not present in the destination [1][2]. Buildah - which is used to run builds in OCP 4.x - inherited this bug to maintain compatibility with Docker.

Imagebuilder - which is used to run multistage Dockerfile builds on OCP 3.11 - does not have this bug. Teams migrating their CI jobs from our 3.11 cluster to 4.x clusters may encounter failures if their build relies on glob copies that preserve the subdirectory structure.

The following repos (producing images with the referenced Dockerfiles) may be impacted:

openshift/cluster-etcd-operator › Dockerfile.rhel7
openshift/cluster-image-registry-operator › Dockerfile
openshift/cluster-kube-apiserver-operator › Dockerfile.rhel7
openshift/cluster-kube-controller-manager-operator › Dockerfile.rhel7
openshift/cluster-kube-scheduler-operator › Dockerfile.rhel7
openshift/cluster-logging-operator › Dockerfile
openshift/cluster-nfd-operator › Dockerfile.rhel7
openshift/cluster-samples-operator › Dockerfile.rhel7
openshift/loki › fluentd/fluent-plugin-grafana-loki/Dockerfile
openshift/must-gather › Dockerfile
openshift/must-gather › Dockerfile.rhel7
openshift/ocp-release-operator-sdk › ci/dockerfiles/ansible-e2e-hybrid.Dockerfile
openshift/ocp-release-operator-sdk › ci/dockerfiles/ansible.Dockerfile
openshift/ocs-operator › must-gather/Dockerfile
openshift/origin-aggregated-logging › curator/Dockerfile
openshift/origin-aggregated-logging › curator/Dockerfile.centos7
openshift/prometheus-operator › scripts/tooling/Dockerfile
openshift/router › images/router/haproxy/Dockerfile
openshift/router › images/router/haproxy/Dockerfile.rhel
openshift/router › images/router/nginx/Dockerfile
openshift/router › images/router/nginx/Dockerfile.rhel
openshift/svt › networking/synthetic/stac-s2i-builder-image/Dockerfile
openshift/windows-machine-config-operator › build/Dockerfile


Solution:

When possible, use simple directory copies with a trailing slash in the destination instead of globs. This will copy the directory and its subdirectories to the destination.

Example:

```
COPY foo/dir /tmp/
```

will move the contents of “dir” to /tmp/dir. This may require you to update the source file structure so that the source and destination directories align.

Actions:

1. Review the Dockerfiles used to build your images if your Dockerfile is referenced above.
2. Test your Dockerfile build with a current version of Docker or buildah. If your build fails with Docker/buildah, replace glob usage with simple directory file copies.
3. Submit a PR with your changes, referencing the appropriate BZ for the version you are targeting your PR against.
4. Cherrypick your PRs to the earliest version the referenced Dockerfile was used to produce an image. Retitle your PR with the appropriate BZ and mention Ben Parees (@bparees) in your pull request.


Additional Info:

[1] https://github.com/moby/moby/issues/29211
[2] https://github.com/moby/moby/issues/15858


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