commands: make build podman compatible

[delvin1933]

Description of the change:

When running 'operator-sdk' build with podman-docker the build fails
with a path error. Removing -f and setting the PATH argument to ./build
allows podman to build the container.

Has been tested against podman 1.12 on fedora 29 and docker-ce 5:18.09.33-0debian-stretch on debian stretch

Motivation for the change:

I want to be able to build the operator container with podman as I don't use docker

[openshift-ci-robot]

Hi @christophefarges. Thanks for your PR.

I'm waiting for a operator-framework or openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[joelanford]

@christophefarges I don't think this change will work because the Dockerfile expects the working directory to be <operatorRootDir>, not <operatorRootDir>/build.

I tested your PR with docker-ce 18.06.1, and got the following error:

$ operator-sdk build go-operator
INFO[0000] Building Docker image go-operator            
Sending build context to Docker daemon  40.22MB
Step 1/7 : FROM registry.access.redhat.com/ubi7-dev-preview/ubi-minimal:7.6
 ---> 1f8526ca508d
Step 2/7 : ENV OPERATOR=/usr/local/bin/go-operator     USER_UID=1001     USER_NAME=go-operator
 ---> Using cache
 ---> 2027d56c12c5
Step 3/7 : COPY build/_output/bin/go-operator ${OPERATOR}
COPY failed: stat /var/lib/docker/tmp/docker-builder498450201/build/_output/bin/go-operator: no such file or directory
Error: failed to output build image go-operator: (failed to exec []string{"docker", "build", "build/", "-t", "go-operator"}: exit status 1)
Usage:
  operator-sdk build <image> [flags]

Flags:
      --docker-build-args string     Extra docker build arguments as one string such as "--build-arg https_proxy=$https_proxy"
      --enable-tests                 Enable in-cluster testing by adding test binary to the image
  -h, --help                         help for build
      --namespaced-manifest string   Path of namespaced resources manifest for tests (default "deploy/operator.yaml")
      --test-location string         Location of tests (default "./test/e2e")

[joelanford]

@christophefarges Can you make this change and re-test with both docker and podman?

[joelanford]

I think with this change, the build command will work with both docker and podman. It seems like podman is a bit more particular about the order of the arguments.

Suggested change

	dbArgs := []string{"build", "build/", "-t", baseImageName}
	dbArgs := []string{"build", "-f", "build/Dockerfile", "-t", baseImageName, "."}

[patrickeasters]

@christophefarges any traction on those changes? I'd very much like podman support as well.

[openshift-ci-robot]

@christophefarges: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[lilic]

@christophefarges Pinging again, if you are too busy one of us can also take over this PR. :)

[grdryn]

Suggested change

	log.Infof("Building Docker image %s", baseImageName)
	log.Infof("Building container image %s", baseImageName)

[grdryn]

I think this can be ignored after rebase: now that #1311 is merged, it's "OCI image".

There are likely other things that need to be changed now that that's merged, such as adding podman to the list of imageBuilder options

[jdoss]

Sorry for the enduser ping. I also do not use Docker and I would love to see better support for podman.

[patrickeasters]

I don't have an issue using podman in the master branch now. It looks like the work in #1311 fixed the order of the arguments. Granted, this does require the podman-docker package or some other sort of symlink, so it may still be worth adding podman explicitly as an option alongside docker and buildah.

[joelanford]

Since the original intent of this PR seems to be resolved, I'll close this.

I've also submitted #1488 to add a podman option to the operator-sdk build --image-builder flag.