Le Fri, 17 Jul 2020 00:10:36 +0200, Zelphir Kaltstahl <zelphirkaltst...@posteo.de> a écrit :
> Hello Guix Users! > > I read on > https://guix.gnu.org/manual/en/html_node/Invoking-guix-import.html: > > "The guix import command is useful for people who would like to add a > package to the distribution with as little work as possible—a > legitimate demand. The command knows of a few repositories from which > it can “import” package metadata. The result is a package definition, > or a template thereof, in the format we know (see Defining Packages)." > > I've recently tried this, for example for MyPy: > > ~~~~ > guix import pypi -r mypy > ~~~~ > > This will result in Guile code printed to my terminal. However, I do > not understand how to make use of that code. I do not understand how > I can load it. For example I tried using the -l argument with guix > environment: > > ~~~~ > guix import pypi -r mypy > additional_file.scm > guix environment --pure --load=additional_file.scm --ad-hoc > python@3.8.2 /home/user/dev/Python/additional_file.scm:2:2: error: > package: unbound variable hint: Did you forget `(use-modules (guix > packages))'? ~~~~ > > So that seems to be the wrong way of trying to make use of it. > > Do I need to provide a patch to the project of the Guix package > manager to add this to Guix packages in general and then be able to > use it in my local setup? > > I do not find the info, how I can now use MyPy inside an environment > or add it to the available packages on any of the following pages: > > - > https://guix.gnu.org/manual/en/html_node/Python-Modules.html#Python-Modules > > - https://guix.gnu.org/manual/en/html_node/Invoking-guix-import.html > > While https://guix.gnu.org/manual/en/html_node/Submitting-Patches.html > makes me think, that perhaps I need to submit it as patch to be able > to use MyPy. > > If so, how would I test, whether guix import did its thing correctly? > I could try running MyPy in an environment, but for that I would have > to somehow make use of what guix import gives me, before submitting a > patch. > > Also, if I need to submit a patch adding the guix import output > somewhere, is there a guide on how to create such a patch for the Guix > project? > > Regards, > Zelphir > Hi zelphir, You don't need to send a patch, although it would be very welcome. You should read https://guix.gnu.org/manual/devel/en/html_node/Defining-Packages.html where you can learn about package modules and how to import missing modules that cause the issue you are having. Basically, you need a header such as (use-modules (gnu) (guix packages)) etc... Then, you'll have to make sure your file returns something: guix import -r will return you a code that defines one or more variables, but nothing is returned. If you don't do anything, after adding the required headers, you'll simply see an error about #<undefined>. Put the name of the package you want to build in its own line at the very end of the file, like: python-mypy this will ensure the value associated with that variable is returned from the file, and you will be able to load the file with guix environment -l or guix build -f. HTH!
