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From: aurtzy <aurtzy <at> gmail.com> To: 73668 <at> debbugs.gnu.org Cc: John Kehayias <john.kehayias <at> protonmail.com>, squishypinkelephant <at> gmail.com Subject: [bug#73668] libglvnd support in mesa Date: Sun, 6 Oct 2024 16:31:17 -0400
Hi!
I've been looking further into adding libglvnd support to mesa, following recent
discussions on mesa updates [1]. There is a reportedly working version by The
Man [2] which does so by unionizing libglvnd and mesa files, but with the
suggestion to try a libglvnd-as(-propagated)-input approach first, the rest of
this message will focus on working towards that. Relevant parties from the
previous discussion have been CCed.
Context as I understand it: Adding libglvnd as an input to mesa causes mesa to
build without some/all lib*.so files that it usually has because libglvnd
becomes the package that will have them. This means that if a package with mesa
as a dependency employs any code that assumes libraries in mesa
(e.g. =(string-append (assoc-ref inputs "mesa") "/lib/libGL.so")=), the build
fails. This appears to be the main issue.
I devised a script to find all the packages that probably need fixing. It is
included at the end of this message. I cross-checked its coverage with
consult-grep from emacs-consult (search phrase: =mesa lib=), which doesn't seem
to reveal any other packages that would need changes, but I'm not sure if
there's a better way to validate this without going through what seems like a
/lot/ of packages with mesa as a transitive input.
The script outputs the following packages that may need to be changed:
--8<---------------cut here---------------start------------->8---
gnu/packages/virtualization.scm:2133:2 "looking-glass-client"
gnu/packages/video.scm:4030:2 "obs"
gnu/packages/tor-browsers.scm:203:2 "torbrowser"
gnu/packages/qt.scm:450:2 "qtbase"
gnu/packages/python-xyz.scm:25513:4 "python-glcontext"
gnu/packages/python-xyz.scm:25441:2 "python-pyopengl"
gnu/packages/perl.scm:8504:2 "perl-opengl"
gnu/packages/music.scm:1122:2 "extempore"
gnu/packages/librewolf.scm:218:2 "librewolf"
gnu/packages/gnuzilla.scm:709:2 "icecat-minimal"
gnu/packages/gl.scm:746:2 "guile-opengl"
gnu/packages/gl.scm:1207:2 "glmark2"
gnu/packages/chromium.scm:484:2 "ungoogled-chromium"
--8<---------------cut here---------------end--------------->8---
Should we consider adjusting variable names as well? I have noticed GL
libraries are sometimes assigned to e.g. "mesa-lib", but they will no longer be
part of mesa if libglvnd support is enabled (an alternative name could be
"gl-lib"). While this is more "cosmetic" and applies to a larger number of
packages, I wonder if it might be a point of confusion for readers. See
libepoxy and its use of "mesa-lib" for an example.
If no one's already started work or wants to take point on this, I should be
able to make some time these next few weeks to write patches :)
The mentioned script:
--8<---------------cut here---------------start------------->8---
#!/usr/bin/env -S guix repl --
!#
(use-modules (gnu)
(guix)
(guix diagnostics)
(guix records)
(ice-9 match)
(srfi srfi-1)
(srfi srfi-26))
(define (sexp-contains sexp predicate)
"Call (PREDICATE S-EXPRESSION) on every node of SEXP (recursively), and return
the predicate value on the first instance that it is non-false. If none of the
nodes satisfy the predicate, return false."
(define (%sexp-contains sexp rest-sexps)
(match sexp
((= predicate (and (not #f) return-value))
return-value)
((child rest-children ...)
(%sexp-contains child (append rest-children rest-sexps)))
(else
(match rest-sexps
((next-sexp rest-sexps ...)
(%sexp-contains next-sexp rest-sexps))
(else
#f)))))
(%sexp-contains sexp '()))
(define (sexp-at-location filename line column)
"Return the next s-expression after LINE and COLUMN (both one-indexed) in
FILENAME."
(call-with-input-file filename
(lambda (port)
(go-to-location port line column)
(read port))))
(define (relevant-package? package)
"Return whether PACKAGE is a potentially relevant package."
(->bool
(and (any (match-lambda
(("mesa" _ ...) #t)
((? package? (= package-name "mesa")) #t)
(else #f))
(package-transitive-inputs package))
(and=> (sexp-contains (match (package-location package)
(($ <location> file line column)
(sexp-at-location file line (1+ column))))
(lambda (sexp)
(and (list? sexp)
(match (memq #:phases sexp)
((#:phases phases _ ...) phases)
(else #f)))))
(lambda (phases-sexp)
;; Use the following conditions to determine if the
;; package does stuff with mesa libraries.
(and (sexp-contains phases-sexp
(lambda (sexp)
(and (string? sexp)
(string-contains sexp "lib"))))
(or (sexp-contains phases-sexp
(lambda (sexp)
(and (symbol? sexp)
(eq? sexp 'mesa))))
(sexp-contains phases-sexp
(lambda (sexp)
(and (string? sexp)
(string-contains sexp
"mesa")))))))))))
(define (main . _)
"Run this in the top level of the guix repository with \"./pre-inst-env\"."
(format #t "Relevant packages:\n\n")
(for-each
(lambda (package)
(match (package-location package)
(($ <location> file line column)
(format #t "~a:~a:~a ~s\n"
file
line
column
(package-name package)))))
(fold-packages
(lambda (package result)
(if (relevant-package? package)
(cons package result)
result))
'())))
(main)
--8<---------------cut here---------------end--------------->8---
[1] https://issues.guix.gnu.org/73071#12
[2] https://issues.guix.gnu.org/73071#13
Cheers,
aurtzy
GNU bug tracking system
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1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson.