Allow directly pushing archives, in particular ZIP or JAR

[voor]

Describe the problem/challenge you have
In a popular workflow that enables a premade JAR to be accessible to Cartographer's source.image reference you actually need 2 steps:

1. unzip the JAR file
2. imgpkg push the contents of the JAR file.
   Several CLI implementations do this transparently, but those CLIs are serving other products primarily and do not offer a generic experience, in particular if you're not leveraging the products those CLIs are serving.

Describe the solution you'd like
imgpkg push --archive that would detect a zip, jar, or maybe even tar and push those contents.

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[joaopapereira]

Hey @voor

Are you planning of using this feature with -f flag? It sounds like it could be a problem because files might overwrite themselves. Also, I assume that you will only want 1 archive per push, correct?
I think that maybe these 2 flags should exclude each other.

Since you can unzip a jar file I think zip and jar could behave the same way, implementation-wise. But eventually, if it fails it could try to see if the file can be untared.

[voor]

The use case was exclusive use of --archive so if was mutually exclusive to -f that'd be fine.

[joaopapereira]

Sounds good, let us do that.

The flag --archive and -f are mutually exclusive.
The flag --archive can only be used once.

Going to accept this issue.
As always if anyone is interested in implementing this just let us know.

[cppforlife]

idea for the flag name: --file-archive. this would put it into same category as --file so it would be more naturally discoverable.

[sabeer6870]

Hi, along with the JAR and zip, can this feature include the pushing of bundle.tar.gz? This bundle.tar.gz is just the compressed imgpkg directory.
So, when a user pushes imgpkg.tar.gz it should get expanded and pushed as a bundle to the oci registry.

Contents of imgpkg.tar.gz:

examples/basic-step-2
├── .imgpkg
│   ├── bundle.yml
│   └── images.yml
└── helm.tgz

expected usage:

imgpkg push -b index.docker.io/user1/simple-app-bundle:v1.0.0 -f <my_imgpkg>.tar.gz