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Re: more package transformations: overrides

From: Sarthak Shah
Subject: Re: more package transformations: overrides
Date: Fri, 24 Mar 2023 13:51:05 +0530

Thanks for the CC, Josselin!
I like Maxim's idea of providing all kinds of arguments through a separate file or stdin.
Here's a tiny proof-of-concept script implementing that:
#!/usr/bin/env bash
while read line
  argstr="$argstr $line"
done < "${1:-/dev/stdin}"

guix shell $argstr
This takes arguments from either a file or stdin.
It is also possible to provide an arg file and supply additional arguments from stdin (i.e. echo "arguments" | ./ /some/file-containing-args will take arguments from both)
This functionality could be baked into guix shell itself, wherein if you pass an argument (say "-a") it will read arguments from either a supplied file or stdin.
(of course, some error handling needs to be added)
I would like to have a more lisp-y way of doing this, however, if I'm being honest.
Perhaps we could add some code that goes over a list from stdin/files?
Input could potentially look like this:
'(C N (with-source pkgname src) (with-input a b))
which would give
guix shell -C -N --with-source=pkgname=src --with-input=a=b

Happy hacking!

On Thu, Mar 23, 2023 at 8:53 PM Ricardo Wurmus <> wrote:

Maxim Cournoyer <> writes:

>> Considering that the transformations API assumes that you understand
>> that higher order functions exist and what to do with them, I think it
>> would be good to offer a slightly less advanced method of overriding
>> packages.
>> Manifests can do anything, but this also makes them rather intimidating
>> for many of my colleagues.
> OK; then my question would be: why stop at transformations?  Perhaps we
> could simply have a way to feed arbitrary guix command line arguments
> from a file, e.g.
> guix shell --args-file=my-arguments.txt

The transformations command line options are rather verbose:


I think it would improve usability to be able to use the *same* names in
an override file.  Got a package with name “python-pytorch” in that
file?  It replaces “python-pytorch” in the graph.


On the separate topic of reading arguments from elsewhere, though, I
think being able to read arguments from stdin could be useful.  Without
having to add a new option one could then do

    guix shell < my-arguments.txt


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