Support for git refs in poetry add

[dmfigol]

• I have searched the issues of this repo and believe that this is not a duplicate.

Hi!
Thanks for the tool. Migrating from pipenv to poetry.
It would be great to see git refs support in poetry add. Every so often I install packages from Git branches/pull requests. Currently this syntax does not work:

-> % poetry add nornir --git https://github.com/nornir-automation/nornir.git@2.0

Updating dependencies
Resolving dependencies... (0.6s)

[CalledProcessError]
Command '['git', 'clone', 'https://github.com/nornir-automation/nornir.git@2.0', '/var/folders/js/jzwkkbb53nd7ns_53g069nlr0000gn/T/pyp
oetry-git-norniryq5f776b']' returned non-zero exit status 128.

add [-D|--dev] [--git GIT] [--path PATH] [-E|--extras EXTRAS] [--optional] [--python PYTHON] [--platform PLATFORM] [--allow-prereleases] [--dry-run] [--] <name> (<name>)...

I have to add it manually in pyproject.toml, but I would love to avoid that:

[tool.poetry.dependencies]
python = "*"
nornir = { git = "https://github.com/nornir-automation/nornir.git", branch = "2.0" }

I don't exclude that requested functionality is already available, but I could find it in the docs.
Thanks!

[agronholm]

There seems to be no way to specify the branch in poetry add but still this is somehow supported in pyproject.toml?

[floer32]

@agronholm yes it seems there are a number of features which are not supported on the command-line add, I'm personally not clear whether it's by design or just awaiting implementation

[im-n1]

Just ran into this. This needs to be documented asap - it's really hard to figure out how to add your github repo fork. Please give it a few minutes and update the docs.

[Serkan-devel]

Does git dependency support exist in the current stable release or is it being rewritten?

[sdispater]

This has been added in #1221 and is currently available in the latest prereleases of the 1.0.0 version.

[github-actions]

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