Handling Debian Python packages with pdm-pep517 backend
-------------------------------------------------------

If you are preparing Python packages that use pdm-pep517 as build
backend as well as its Dynamic Version feature [1], the automatic
version detection will not work out-of-box because of the lack of
.git directory during packaging. Please consider using environment
variable in debian/rules file to pass the version string instead:

```makefile
include /usr/share/dpkg/pkg-info.mk
export PDM_PEP517_SCM_VERSION = $(DEB_VERSION_UPSTREAM)
```

This will work when $(DEB_VERSION_UPSTREAM) is a reasonable value (e.g.,
using X.Y.Z format). Packages with repacked version string may need
more sophisticated handling.

[1] https://github.com/pdm-project/pdm-pep517#dynamic-project-version

 -- Boyuan Yang <byang@debian.org>  Wed, 17 Aug 2022 14:50:40 -0400