[bug#44736] [Shepherd PATCH] build: Add guix.scm helper file.

[Efraim Flashner]

On Mon, Jan 11, 2021 at 01:36:38PM +0100, Ludovic Courtès wrote:
> Hello!
> 
> Efraim Flashner <efraim@flashner.co.il> skribis:
> 
> > * build-aux/guix.scm: New file.
> 
> Could you (1) add a copyright header, and (2) add this file to
> ‘EXTRA_DIST’ in ‘Makefile.am’?

Sure

> > +(define (keep-file? file stat)
> > +  (not (any (lambda (my-string)
> > +              (string-contains file my-string))
> > +            (list ".git" ".dir-locals.el" "build-aux"))))
> 
> FWIW, I’m never quite sure what to do here.  In Guile-zstd, I wrote
> something that works even from a tarball (not a Git checkout), but it’s
> a bit verbose:
> 
>   https://notabug.org/guile-zstd/guile-zstd/src/master/guix.scm

Looking at that list I feel like I'm missing bits. If we go down the
rabiit hole of figuring out all the different files which could possibly
be included in the list I feel like we should keep it as a fancy macro
somewhere. It'd almost be easier to copy the entire directory somewhere,
run 'git clean -dfx' and then use that. Or to parse .gitignore or make
clean.

> > +(define (build-from-git base)
> > +  (package
> > +    (inherit base)
> > +    (version (git-version (package-version base) "HEAD" %git-commit))
> > +    (source (local-file %source-dir
> > +                        #:recursive? #t
> > +                        #:select? keep-file?))
> 
> […]
> 
> > +(list (build-from-git (specification->package "shepherd"))
> > +      (build-from-git (specification->package "guile2.2-shepherd"))
> > +      ;; This version FTBFS due to an import of '(ice-9 threads)' in 
> > modules/shepherd.scm
> > +      ;(build-from-git (specification->package "guile2.0-shepherd"))
> > +      )
> 
> Should it be a manifest instead, so that ‘guix build -f’ works?

Returning a list also seems to work

(ins)efraim@3900XT ~/workspace/shepherd$ guix build -f build-aux/guix.scm -n
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bayfront.guix.gnu.org'... 100.0%
The following derivations would be built:
   /gnu/store/g2ql360i3s02mg42l4ys27lsghpx5xqq-shepherd-0.8.1-HEAD.b482009.drv
   
/gnu/store/ajlqc21qqmi3fp5j30jq7vc0i1qn701y-guile2.2-shepherd-0.8.1-HEAD.b482009.drv
   /gnu/store/nbq7yw0zzmrwvykcld3fsbgmh39fapym-guile2.0-shepherd-0.8.1.drv


> The downside of returning several packages is that ‘guix environment -l
> guix.scm’ won’t work.

Technically it works, but it's not as useful as just getting the inputs
you actually want.

(ins)efraim@3900XT ~/workspace/shepherd$ guix environment -l build-aux/guix.scm
(ins)efraim@3900XT ~/workspace/shepherd [env]$ which -a guile
/gnu/store/xlsi9fmi4blrpwn4xy8cvfq86zhag878-profile/bin/guile
/home/efraim/.guix-profile/bin/guile
/run/current-system/profile/bin/guile
(ins)efraim@3900XT ~/workspace/shepherd [env]$ 
/gnu/store/xlsi9fmi4blrpwn4xy8cvfq86zhag878-profile/bin/guile --version
guile (GNU Guile) 3.0.2
Copyright (C) 2020 Free Software Foundation, Inc.

License LGPLv3+: GNU LGPL 3 or later <http://gnu.org/licenses/lgpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
(ins)efraim@3900XT ~/workspace/shepherd$ ls 
/gnu/store/xlsi9fmi4blrpwn4xy8cvfq86zhag878-profile/lib/guile/
2.0  2.2  3.0/

> Thanks,
> Ludo’.

I also got guile2.0-shepherd to build.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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0001-build-Add-guix.scm-helper-file.patch
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