Improve Git Credential Helper Detection for Linux (GCM & libsecret support)

[danchev]

Description

This pull request introduces improvements to the detection and handling of Git credential helpers in the Huggingface Hub client for Linux environments.

Summary of the last two commits

1. Support for Git Credential Manager (GCM)

   • Updated the regex to match git-credential-manager.
   • Added tests to verify GCM is recognized and handled.
   • Ref: https://git-scm.com/doc/credential-helpers

2. Support for git-credential-libsecret

   • Extended the regex to recognize git-credential-libsecret, enabling integration with Secret Service-compatible keyrings (e.g., GNOME Keyring, KDE Wallet) on Linux.
   • Added unit tests to validate detection and handling of git-credential-libsecret.
   • Ref: https://git-scm.com/doc/credential-helpers

These changes improve compatibility with modern credential storage solutions and enhance security for Linux users.

[Copilot]

Pull Request Overview

This PR updates the git credential helper parsing to support a broader range of helper names and paths, expanding beyond simple word characters to include hyphens and absolute paths.

• Updates regex pattern to handle git credential helpers with hyphens and absolute paths
• Adds test coverage for new credential helper formats including git-credential-manager and absolute paths

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/huggingface_hub/utils/_git_credential.py	Updates regex pattern to capture credential helpers with hyphens and absolute paths
tests/test_utils_git_credentials.py	Adds test data and assertions for new credential helper formats

[Wauplin]

Thanks for opening this PR and adding tests @danchev ! Changes make total sense IMO so let's merge it :)

[Wauplin]

FYI, it's also possible to clone a repo using git+ssh instead of git+https which makes it unnecessary to use a git credential helper in that case. That was not possible when we first introduced support for git credential helpers. Both approaches are perfectly valid, I just wanted to mention :)

[HuggingFaceDocBuilderDev]

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