gcloud-cli: add Linux support

[botantony]

Closes ublue-os/homebrew-tap#177

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[maythazin5]

Any reason why gcloud linux support is needed?

[bevanjkay]

Any reason why gcloud linux support is needed?

I don't really understand this question? The package is available for installation on Linux, so it makes sense for it to be available in homebrew-cask for Linux users?

[maythazin5]

Any reason why gcloud linux support is needed?

I don't really understand this question? The package is available for installation on Linux, so it makes sense for it to be available in homebrew-cask for Linux users?

We are just wondering whether there is significant user demands to add Linux support, or if we are proceeding simply for consistency with gcloud's existing offerings for different platforms?

One caveat is gcloud has linux packages available but gcloud linux x86_64 package comes with their own bundled Python so this gcloud cask will install additional python but gcloud will not use it.

[bevanjkay]

We are just wondering whether there is significant user demands to add Linux support, or if we are proceeding simply for consistency with gcloud's existing offerings for different platforms?

I don't believe there's anything really to discuss here unless there is a technical reason that the cask would never work. If an install is possible through Homebrew, and somebody opens a PR for it, and it works, then we ship it.

If you aren't willing to help get this over the line, then I would kindly ask that you move on from this PR.

[SMillerDev]

Seems like the install needs a python binary on Linux. Is there a uses_from_macos "python" => :build for casks?

[bevanjkay]

Yeah I need to put the dependency back in for Linux arm. It's only the x86_64 that bundles it.

[maythazin5]

Thanks @bevanjkay!

For Linux Arm, most gcloud commands will work without these extension modules but some commands like gcloud storage have dependency of grpc modules. Since gcloud config virtualenv in postflight only works for macOS to install modules now, users can manually install those modules after installing gcloud cask on Linux ARM. This is the known issue / gap for Linux ARM and we are still looking into how to bundle those modules with gcloud Linux ARM packages by default.