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Re: Make a simple guile script to a package - source local file

From: Tomas Volf
Subject: Re: Make a simple guile script to a package - source local file
Date: Sat, 20 Jan 2024 14:29:38 +0100

On 2024-01-20 12:32:08 +0000, Théo Tyburn wrote:
> Richard Sent <> writes:
> > Depending on what you mean by polluting or re-entering the profile
> > information all the time this might not be what you want. When I write
> > scripts that rely on specific dependencies I don't want to permanently
> > install, I write the shebang like this:
> >
> > --8<---------------cut here---------------start------------->8---
> > #!/usr/bin/env -S guix shell ruby ruby-colorize password-store -- ruby
> > --8<---------------cut here---------------end--------------->8---
> This is a really nice trick !
> Unfortunately you either have to reevaluate the profile at each
> run or create a profile and do something like
> #!/usr/bin/env -S guix shell -p
>   ${GUIX_EXTRA_PROFILES}/python-pydbus/python-pydbus -- python3

It is work nothing that guix shell does cache the profiles, so it is pretty

    $ time -p guix shell vim -- true
    The following derivation will be built:
    applying 3 grafts for tcsh-6.24.01 ...
    applying 7 grafts for vim-9.0.2001 ...
    building CA certificate bundle...
    listing Emacs sub-directories...
    building fonts directory...
    building directory of Info manuals...
    building profile with 1 package...
    real 2.28
    user 1.24
    sys 0.09
    $ time -p guix shell vim -- true
    real 0.11
    user 0.14
    sys 0.01
    $ time -p guix shell vim -- true
    real 0.11
    user 0.13
    sys 0.02

> > This relies on /usr/bin/env supporting -S, which to my understanding
> > isn't POSIX but instead a coreutils extension. Pretty sure --container
> > would work here but I've not tried it.
> Also as you mentioned, I fear I will not be able to directly
> distribute this to people not running guix.
> But thanks for the hint :)

I am using (for guile scripts) something like:

  exec guix shell ... -- guile -e main -s "$0" "$@"

So if the language allows you to treat the first non-shebang line as a shell
script, you can suddenly get by with POSIX env (which is handy on alpine linux).

Have a nice day,
Tomas Volf

There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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