Re: Scripting guix in guile

[Jesse Gibbons]

On Sat, 2019-08-31 at 11:38 -0600, Jesse Gibbons wrote:
> On Sat, 2019-08-31 at 19:03 +0200, Konrad Hinsen wrote:
> > Hi everyone,
> > 
> > I'd like to write Guile scripts that inspect Guix, for example
> > analyze
> > the packages is my profile. That turned out to be a lot more
> > difficult
> > than I expected, and in fact I haven't found a satisfying general
> > solution yet, meaning a script that I could publish in such a way
> > that
> > any Guix user could download and run it without modification.
> > 
> > The problems I see are
> > 
> >  1. What to put into the #! line to locate Guile.
> 
> I don't think you need a shebang to script guile.
Turns out you do.
>  If you do, you could always make a guix package for the scripts, and
> that will fix everything in the patch-shebangs phase.
If you package it for guix you can use it to develop your scripts as
well. 
> >  2. How to construct the load path to make sure it includes
> >     Guix as installed under $HOME/.config/guix/current
> 
> I think the default GUILE_LOAD_PATH includes guix. Here's the
> contents
> of mine:
> ~$ ls $GUILE_LOAD_PATH 
> bytestructures  git.scm  gnutls      guix.scm  json.scm  shepherd.scm
> gcrypt          gnu      gnutls.scm  ice-9/    mcron     sqlite3.scm
> git             gnu.scm  guix        json      shepherd  ssh
> 
> gnu/, gnu.scm, guix/, and guix.scm are all guix, and guix is not part
> of my current profile. Note also most of these are prerequisites for
> guix.
> > 
> > I wonder if could somehow hijack 'guix repl', which solves these
> > problems for a REPL but not for scripts.
> > 
> > Any ideas?
> > 
> > Konrad
> > 
> 
> -You're writing tools for a package manager... try packaging those
> tools for the package manager. It will take care of them like it
> takes
> care of everything else. 
> --You can wrap the executables with the environment variables you
> need
> so the executable scripts are callable from the default PATH. See
> what
> guix does with guile, mcron, and shepherd, which are mostly guile
> scripts with a little bit of native code.