Refactor to enable packaging glab inside another golang CLI tool (overriding config location)

[addshore]

Describe the feature or problem you'd like to solve

I would like to incorporate a gitlab sub command into a CLI I am developing for MediaWiki / Wikimedia developers.
This would work as part of an already released binary, and be automatically configured to point to the Wikimedia Gitlab instance

Propose a Solution

Refactor glinstance and or Factory to allow overriding the location of the configuration file as well as the domain to be use for gitlab.
This would allow users to use a version of the glab CLI packaged within the mwcli as well as a standalone glab binary pointing to the default instance.

Additional context

It would appear something like this:

Other CLI codebase: https://gitlab.wikimedia.org/releng/cli

[profclems]

Hi @addshore, I didn't really expect a use case like this for glab. With this, you need access to the internal packages like glinstance and config.

For instance, to override the default host, you need to use the glinstance.OverrideDefaultProtocol(host) which is in the internal/glinstance package.

glab/internal/glinstance/host.go

Lines 46 to 48 in c608850

	func OverrideDefault(newhost string) {
	hostnameOverride = newhost
	}

I can confirm that it's safe to move these packages to the pkg folder but I don't know if I will be able to work on this anytime soon. This is open in case you'd like to take this up.

[addshore]

Great!
I'll try and have a go moving these things around!

[addshore]

Ahh right there is per host config already it seems?

./bin/mw glab config get -g
Error: accepts 1 arg(s), received 0
Usage:  mw glab config get <key> [flags]

Flags:
  -g, --global        Read from global config file (~/.config/glab-cli/config.yml). [Default: looks through Environment variables → Local → Global]
  -h, --host string   Get per-host setting

accepts 1 arg(s), received 0

So I could leave the configuration location etc totally untouched? just changing the default host probably?

[profclems]

Yeah you only need to change the default host and leave the config untouched.
glab already supports per-host config