* Minimal working examples of packages for experimentation?
@ 2023-02-27 19:26 Rodrigo Morales
2023-02-27 21:33 ` Jelle Licht
0 siblings, 1 reply; 2+ messages in thread
From: Rodrigo Morales @ 2023-02-27 19:26 UTC (permalink / raw)
To: help-guix
Table of Contents
_________________
1. The context
2. What I've tried
3. What I'm looking for
1 The context
=============
I'm trying to write the simplest package definition that does nothing
in order to be able to generate multiple generations on the fly and
experiment with the `guix package' flags that act on generations.
I asked the same question in <irc://irc.libera.chat/guix> and someone
recommended me using the `my-hello' package shown as an example in
(guix-cookbook) GUIX_PACKAGE_PATH. I replied to him that I didn't want
to use that definition because it downloads a file and performs some
compilation steps and I was looking for something simpler. The same
user replied "you could copy the sources to a local directory, and
edit the file description so it's url-fetch method and the uri is the
absolute path to where the pkg is.". I haven't found examples on this,
so I thought it would be difficult to do it.
I found several examples on using `url-fetch', so I decided to write a
package that downloads a single small file from the Internet
(e.g. <https://www.gnu.org/graphics/heckert_gnu.transp.small.png> )
and install it under a directory. This is what I tried to write but
with no avail. The next section shows what I tried.
2 What I've tried
=================
The following is the package that I wrote.
,----
| (define-module (my-simple)
| #:use-module (guix licenses)
| #:use-module (guix packages)
| #:use-module (guix gexp)
| #:use-module (guix build-system trivial)
| #:use-module (guix download))
|
| (define-public my-simple-1
| (package
| (name "my-simple-1")
| (version "2.10")
| (source (origin
| (method url-fetch)
| (uri "
https://www.gnu.org/graphics/heckert_gnu.transp.small.png")
| (sha256 (base32
"1686w7x3qk85i5693nrj7lbdh64232fdsqd5rgxgijv1y39rldbr"))))
| (build-system trivial-build-system)
| (synopsis "My synopsis")
| (description "My description")
| (home-page "https://example.org/")
| (license gpl3+)))
`----
If I try to install the package I get the following
error. Fortunately, it shows that there's a build log.
,----
| export GUIX_PACKAGE_PATH=~/my-packages
| guix package -i my-simple-1
| echo Exit code: $?
`----
,----
| The following package will be installed:
| my-simple-1 2.10
|
| substitute:
substitute: [Kupdating substitutes from 'https://ci.guix.gnu.org'... 0.0%
substitute: [Kupdating substitutes from 'https://ci.guix.gnu.org'... 100.0%
| substitute:
substitute: [Kupdating substitutes from 'https://bordeaux.guix.gnu.org'...
0.0%
substitute: [Kupdating substitutes from 'https://bordeaux.guix.gnu.org'...
100.0%
| The following derivations will be built:
| /gnu/store/lsqc0zjvqmnc8vbkk36g9jy5bcnmk455-profile.drv
| /gnu/store/a1cxm06cdacqry9x0c14pnb4s491b6z9-my-simple-1-2.10.drv
|
| building
/gnu/store/a1cxm06cdacqry9x0c14pnb4s491b6z9-my-simple-1-2.10.drv...
| builder for
`/gnu/store/a1cxm06cdacqry9x0c14pnb4s491b6z9-my-simple-1-2.10.drv' failed
to produce output path
`/gnu/store/a8p80lxgcar332ln81ss6pl9xr0wajsh-my-simple-1-2.10'
| build of
/gnu/store/a1cxm06cdacqry9x0c14pnb4s491b6z9-my-simple-1-2.10.drv failed
| View build log at
'/var/log/guix/drvs/a1/cxm06cdacqry9x0c14pnb4s491b6z9-my-simple-1-2.10.drv.gz'.
| cannot build derivation
`/gnu/store/lsqc0zjvqmnc8vbkk36g9jy5bcnmk455-profile.drv': 1 dependencies
couldn't be built
| guix package: error: build of
`/gnu/store/lsqc0zjvqmnc8vbkk36g9jy5bcnmk455-profile.drv' failed
| Exit code: 1
`----
When I try to read the log file, it is empty.
,----
| echo 'foo'
| zcat
/var/log/guix/drvs/a1/cxm06cdacqry9x0c14pnb4s491b6z9-my-simple-1-2.10.drv.gz
| echo 'bar'
`----
,----
| foo
| bar
`----
3 What I'm looking for
======================
1. Why the package that I wrote failing? How could I fix it?
2. Do you know simpler package definitions (aka minimal working
examples) that I could use for experimenting?
(This is an example of [The XY problem], question 1 is X, question 2
is Y)
[The XY problem] <https://xyproblem.info>
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Minimal working examples of packages for experimentation?
2023-02-27 19:26 Minimal working examples of packages for experimentation? Rodrigo Morales
@ 2023-02-27 21:33 ` Jelle Licht
0 siblings, 0 replies; 2+ messages in thread
From: Jelle Licht @ 2023-02-27 21:33 UTC (permalink / raw)
To: Rodrigo Morales, help-guix
Hello Rodrigo!
Rodrigo Morales <moralesrodrigo1100@gmail.com> writes:
> [snip]
> The following is the package that I wrote.
>
> ,----
> | (define-module (my-simple)
> | #:use-module (guix licenses)
> | #:use-module (guix packages)
> | #:use-module (guix gexp)
> | #:use-module (guix build-system trivial)
> | #:use-module (guix download))
> |
> | (define-public my-simple-1
> | (package
> | (name "my-simple-1")
> | (version "2.10")
> | (source (origin
> | (method url-fetch)
> | (uri "
> https://www.gnu.org/graphics/heckert_gnu.transp.small.png")
> | (sha256 (base32
> "1686w7x3qk85i5693nrj7lbdh64232fdsqd5rgxgijv1y39rldbr"))))
> | (build-system trivial-build-system)
> | (synopsis "My synopsis")
> | (description "My description")
> | (home-page "https://example.org/")
> | (license gpl3+)))
> `----
> [snip]
> 3 What I'm looking for
> ======================
>
> 1. Why the package that I wrote failing? How could I fix it?
Looking at `info "(guix) Build Systems"'[0], in the blurb about the
trivial-build-system:
--8<---------------cut here---------------start------------->8---
This build system requires a ‘#:builder’ argument. This argument
must be a Scheme expression that builds the package output(s)—as
with ‘build-expression->derivation’ (*note
‘build-expression->derivation’: Derivations.).
--8<---------------cut here---------------end--------------->8---
The reason your package fails to build, is that it doesn't provide such
a #:builder argument. This argument is also responsible for creating the
actual output, which can be a file or directory.
The simplest snippet I can think of for making your package "work":
--8<---------------cut here---------------start------------->8---
(define-public my-simple-1
(package
; .. existing stuff
(arguments (list #:builder #~(mkdir #$output)))))
--8<---------------cut here---------------end--------------->8---
Note that this simply creates the output directory, and does nothing
else.
What may seem a bit misleading here is that "build expressions" have
mostly been ported to this hip thing called G-Expressions (see `info
"(guix) G-Expressions"' [1]).
> 2. Do you know simpler package definitions (aka minimal working
> examples) that I could use for experimenting?
Simple does not always imply easy. If we're talking about an easy to use
build system, I think the `copy-build-system' could work, as does the
gnu-build-system as it allows you to play with the moving parts without
having to supply all of these moving parts yourself :).
A package that uses the trivial-build-system that does slightly more is
`inxi-minimal', which you can find by issuing a `guix edit inxi-minimal'.
HTH!
- Jelle
[0]: https://guix.gnu.org/manual/devel/en/html_node/Build-Systems.html#index-trivial_002dbuild_002dsystem
[1]: https://guix.gnu.org/manual/devel/en/html_node/G_002dExpressions.html
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2023-02-27 19:26 Minimal working examples of packages for experimentation? Rodrigo Morales
2023-02-27 21:33 ` Jelle Licht
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