`credential fill` subcommand fails outside of git repository

[Adolar0042]

Current behavior 😯

gix credential fill fails if the current directory isn't part of a git repository with the message Error: Could not find a git repository in '.' or in any of its parents
From a bit of testing it seems to be originating from this line:

gitoxide/src/plumbing/main.rs

Line 661 in 0a576b9

repository(Mode::StrictWithGitInstallConfig)?,

Expected behavior 🤔

gix credential fill should run, no matter if in a git repository or not

Git behavior

git credential fill runs, no matter if in a git repository or not

Steps to reproduce 🕹

1. Go into a directory that isn't part of any git repository
2. Run both gix and git with the subcommand

$ git credential fill << EOF
protocol=https
host=github.com
EOF

[Byron]

Thanks for reporting.

This is all true, and I'd fix it if gix wasn't as a developer tool.

The culprit is that it wants to read the Git configuration, and for that it uses a repository instance.

gitoxide/gitoxide-core/src/repository/credential.rs

Lines 11 to 25 in 2cc63ca

	pub fn function(repo: gix::Repository, action: gix::credentials::program::main::Action) -> anyhow::Result<()> {
	use gix::credentials::program::main::Action::*;
	gix::credentials::program::main(
	Some(action.as_str().into()),
	std::io::stdin(),
	std::io::stdout(),
	|action, context| -> Result<_, Error> {
	let url = context
	.url
	.clone()
	.or_else(|| context.to_url())
	.ok_or(Error::Protocol(gix::credentials::protocol::Error::UrlMissing))?;
	let (mut cascade, _action, prompt_options) = repo
	.config_snapshot()
	.credential_helpers(gix::url::parse(url.as_ref())?)?;

This can of course be made to not need that, which is probably along the lines of optionally using a gix::Repository, but in absence fall back to loading the global Git configuration.

The problem here is the credential_helpers() function which right now isn't available outside of gix::Repository. I think an ideal solution would allow instantiating such a snapshot from a loaded configuration file, or to have a static method on gix::Repository that produces one, based on global configuration.