On Sun, 1 Oct 2017 18:47:37 +0000
ng0 <ng0@infotropique.org> wrote:

> * gnu/packages/python.scm (python2-setuptools-scm-git-archive): New
> variable. ---
>  gnu/packages/python.scm | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
> index 052547316..de42e6835 100644
> --- a/gnu/packages/python.scm
> +++ b/gnu/packages/python.scm
> @@ -7424,6 +7424,28 @@ from an XML-based format.")
>  files.  UFO is a file format that stores fonts source files.")
>      (license license:bsd-3)))
>  
> +(define-public python2-setuptools-scm-git-archive
> +  (package
> +    (name "python2-setuptools-scm-git-archive")
> +    (version "1.0")
> +    (source
> +     (origin
> +       (method url-fetch)
> +       (uri (pypi-uri "setuptools_scm_git_archive" version))
> +       (sha256
> +        (base32
> +         "1nii1sz5jq75ilf18bjnr11l9rz1lvdmyk66bxl7q90qan85yhjj"))))
> +    (build-system python-build-system)
> +    (arguments
> +     `(#:python ,python-2))
> +    (propagated-inputs
> +     `(("python2-setuptools-scm" ,python2-setuptools-scm)))
> +    (home-page
> "https://github.com/Changaco/setuptools_scm_git_archive/")
> +    (synopsis "setuptools_scm plugin for git archives")
> +    (description
> +     "setuptools_scm plugin for git archives")

Maybe use something like this for the description:

The setuptools_scm_git_archive package is a plugin to setuptools_scm,
which supports obtaining versions from git archives that belong to
tagged versions. 

> +    (license license:expat)))

guix lint warns about the synopsis:

gnu/packages/python.scm:7504:14: python2-setuptools-scm-git-archive@1.0: synopsis should start with an upper-case letter or digit

But other than that, this looks good to me.