bug#38261: Recent changes to emacs build system

[brettg@posteo.net]

On 19.11.2019 01:27, brettg@posteo.net wrote:
> On 18.11.2019 22:34, brettg@posteo.net wrote:
>> On 18.11.2019 21:33, brettg@posteo.net wrote:
>>> On 18.11.2019 21:28, brettg@posteo.net wrote:
>>>> On 18.11.2019 20:01, brettg@posteo.net wrote:
>>>>> Hey all, the recent changes to the emacs build system result in a 
>>>>> few
>>>>> broken packages like emacs-pdf-tools, or basically anything that 
>>>>> uses
>>>>> a phase for emacs-set-emacs-load-path.
>>>>> 
>>>>> For example, I borrowed the technique used by emacs-pdf-tools to
>>>>> package emacs-telega, resulting in both packages failing to build:
>>>>> 
>>>>> Here is the code for emacs-telega:
>>>>> 
>>>>> https://git.sr.ht/~brettgilio/cfg/tree/master/channel/non-gnu/packages/emacs-xyz.scm#L99
>>>>> 
>>>>> The issue is in this phase for both emacs-pdf-tools and my channel 
>>>>> package:
>>>>> 
>>>>>  (add-after 'compress-documentation 'emacs-set-emacs-load-path
>>>>> 			  (assoc-ref emacs:%standard-phases 'set-emacs-load-path))
>>>>> 
>>>>> Resulting in:
>>>>> 
>>>>> starting phase `emacs-set-emacs-load-path'
>>>>> Backtrace:
>>>>>            5 (primitive-load 
>>>>> "/gnu/store/5b1p1gsvfyi4fbx4s42rhab2dns…")
>>>>> In ice-9/eval.scm:
>>>>>    191:35  4 (_ _)
>>>>> In ice-9/boot-9.scm:
>>>>>     829:9  3 (catch _ _ #<procedure 7ffff3bbb518 at 
>>>>> /gnu/store/zmkg…> …)
>>>>> In srfi/srfi-1.scm:
>>>>>    863:16  2 (every1 #<procedure 7ffff30ae160 at 
>>>>> /gnu/store/zmkgrvv…> …)
>>>>> In
>>>>> /gnu/store/zmkgrvvhmrix2b1z7id6zrg9bb7qxzdl-module-import/guix/build/gnu-build-system.scm:
>>>>>    839:30  1 (_ _)
>>>>> In unknown file:
>>>>>            0 (_ #:source 
>>>>> "/gnu/store/qw8xbmk6ryl9a2jrp0gip3yffmsdix…" …)
>>>>> 
>>>>> ERROR: Wrong type to apply: #f
>>>>> 
>>>>> If we suspect that changes are going to be non-backwards compatible
>>>>> could we use the news system to pass along that message? Much
>>>>> appreciated. Thanks.
>>>>> 
>>>>> Brett Gilio
>>>> 
>>>> I applied a hotfix to the package by replacing 'set-emacs-load-path
>>>> with 'add-source-to-load-path. I believe this fix would work for all
>>>> other affected packages.
>>> 
>>> https://git.sr.ht/~brettgilio/cfg/commit/c24a6db9d25151c487e9db675bd74e4bb3912173
>> 
>> Ricardo, just wanted to make you aware that this emacs-build-system
>> change does break your guile-studio. I discovered this because I
>> adopted some of your ideas of autoloading in the generated emacs lisp
>> from guile-studio when creating my own emacs configuration dependent
>> on guix, which resulted in
>> 
>> progn: Wrong number of arguments: (lambda nil "Autoload Emacs packages
>> found in EMACSLOADPATH.
>> 
>> 'Autoload' means to load the 'autoloads' files matching
>> `guix-emacs-autoloads-regexp'." (interactive) (let* ((emacs-load-path
>> (getenv "EMACSLOADPATH")) (emacs-non-core-load-path-directories
>> (seq-filter (function (lambda (dir) (string-match-p
>> "/share/emacs/site-lisp" dir))) (split-string emacs-load-path ":")))
>> (autoloads (mapcan (function guix-emacs-find-autoloads)
>> emacs-non-core-load-path-directories))) (mapc (function (lambda (f)
>> (load f (quote noerror)))) autoloads))), 78
>> 
>> I'll let you know if I can find any fix for this when I get some time.
>> But just wanted to pass the message along.
>> 
>> Brett
> 
> I tried removing the arguments passed to
> `guix-emacs-autoload-packages' as the updated version
> (http://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/aux-files/emacs/guix-emacs.el?id=47b3b4c2aa49e21f4cc32c97ff7bbbd069bb849c)
> does not carry arguments anymore, instead depending on a variable
> EMACSLOADPATH. However, whenever that is done it returns
> 
> split-string: Wrong type argument: stringp, nil
> 
> possibly because my system is not finding EMACSLOADPATH.
> 
> I will keep investigating.

I can confirm, when running something analogous to `guix environment 
--ad-hoc emacs-dashboard` no changes are being made to the 
$GUIX_ENVIRONMENT/etc/profile to resemble EMACSLOADPATH.