Use fully qualified image names (podman compatibility)

[FlorianLudwig]

Description

For podman compatibility (and more) it would be good to use fully qualified image names ( = include registry in image name)

Example: Instead of:

buildpacksio/lifecycle:0.11.3

use:

docker.io/buildpacksio/lifecycle:0.11.3

Changes

• Update internal references to images to include registry
• Update docs to use fully qualified image names in examples

Additional context

See also:

• https://www.redhat.com/en/blog/be-careful-when-pulling-images-short-name
• Support podman v.2 #966 (comment)

[matejvasek]

Not only podman compatibility, it should be also safer.

[jromero]

I like this suggestion although I know there will be some necessary discussion about ease-of-use considering that there's a large number of users that are coming from the docker CLI where the host is assumed if missing.

[FlorianLudwig]

@jromero

changing:

pack/internal/config/config.go

Line 130 in 88c3455

const DefaultLifecycleImageRepo = "buildpacksio/lifecycle"

would not be visible end-user facing. So at least for that part, no ease-of-use consideration would be necessary?

Updating the docs so that all examples include the host might be different.

I do not want to suggest to enforce only accepting image names that contain the host.

[jromero]

@FlorianLudwig I would say that we are on the same page.

1. We should update the reference to lifecycle image
2. Update the docs to include host (I am curious how this would affect image names for images that are only intended to live on the docker daemon. I'm assuming you would still set the host to docker.io which might be contentious).
3. We should NOT enforce only accepting image names that contain a host.

[hhiroshell]

I'm thinking about giving it a try.
But what's the meaning of the contribfest label? Is there anything that should be considered when working on this issue?

[natalieparellano]

@hhiroshell it would be great to get your help on this! Re the label, we flagged this issue for a Contribfest session that we hosted at KubeCon EU, but the issue is still up for grabs.

[hhiroshell]

Thanks @natalieparellano, so could you please assign this to me?

[hhiroshell]

Now, I'm working on fixing documentation at buildpacks/docs#702.

[hhiroshell]

To the reviewers,

The document is now ready for review.

• Use fully qualified image names docs#702.

I apologize for the relatively large pull request, as the entire document has been revised.

[hhiroshell]

Completed for works no the codes.

• Update image references to use fully qualified names. #2185