“guix pack -RR” and ignored environment variables

[Ricardo Wurmus <rekado@elephly.net>]

Hi Guix,

today I wanted to offer a pack of Guile Studio, which provides a wrapper
script “guile-studio” that sets EMACSLOADPATH and then spawns Emacs:

--8<---------------cut here---------------start------------->8---
#!/gnu/store/pwcp239kjf7lnj5i4lkdzcfcxwcfyk72-bash-minimal-5.0.16/bin/sh
EMACSLOADPATH=/gnu/store/7z33lhy9m8xqgym9w3hj30y1w290c8hn-emacs-27.1/share/emacs/site-lisp:/gnu/store/22qrgczgs13r81vh0assi44g65352jsb-emacs-f-0.20.0/share/emacs/site-lisp:/gnu/store/02wl4g5r2jcw3xa50wlvxrzgnbvfl4j9-emacs-memoize-1.1/share/emacs/site-lisp:/gnu/store/5ypb61cywf1jcxb2p85a85a2m19yvbgd-emacs-all-the-icons-4.0.1/share/emacs/site-lisp:/gnu/store/hf1gv2fn3ksnmswmqs2iqpi6762l3vw8-emacs-all-the-icons-dired-1.0-1.980b774/share/emacs/site-lisp:/gnu/store/253a5n1ss5j7q1bn21nxlm468csmnnys-emacs-dired-sidebar-0.1.0-2.da77919/share/emacs/site-lisp:/gnu/store/kfmh5kngrh2911nlwp5wsrjmpwfj7kj4-emacs-doom-modeline-3.0.0/share/emacs/site-lisp:/gnu/store/khrdrw2b06jnf632l886y0ayk2vb62il-emacs-modus-themes-1.1.1/share/emacs/site-lisp:/gnu/store/p7igyy5yfkc1fvnvx19h2g49f6qaajs5-emacs-geiser-0.12/share/emacs/site-lisp:/gnu/store/zf82m64bp66v3sh0rr4p6c26z996dmix-emacs-company-0.9.13/share/emacs/site-lisp:/gnu/store/syrgm56fbk0722rnr59wpircv9n73r2n-emacs-ivy-0.13.1/share/emacs/site-lisp:/gnu/store/425l8kf2rpk9c418vi8i42mw365b4a18-emacs-flycheck-31-2.9bcf6b6/share/emacs/site-lisp:/gnu/store/5z9jjvcfj8qka4ly8iysyrgvyzksj6ig-emacs-flycheck-guile-0.2/share/emacs/site-lisp:/gnu/store/43bpv64d0a6x8bmqcdp4fsawhmspd5mk-emacs-paren-face-1.0.7/share/emacs/site-lisp:/gnu/store/gpwzl1nsis1s3q48sl8qn0hm4g41qgyz-emacs-dash-2.18.0/share/emacs/site-lisp:/gnu/store/gcw8lz0xvansb4dpfiq9m3kzqx0qc12n-emacs-s-1.12.0/share/emacs/site-lisp:/gnu/store/0iwc19qcn2ylrnpsqrfmg8jsij0q6yz7-emacs-dired-hacks-0.0.1-3.d1a2bda/share/emacs/site-lisp:/gnu/store/1a6aqvylh3qym2n3npp9gbvcfpzyglgg-emacs-shrink-path-0.3.1/share/emacs/site-lisp:/gnu/store/60qfm0v7v3h9bl3x5q6iw1kb1phy0w2z-emacs-hydra-0.15.0/share/emacs/site-lisp:/gnu/store/jvdh3zi4fc28ipk2g1na1i6vfa8xismi-emacs-eimp-1.4.0-1.2e7536f/share/emacs/site-lisp:
exec /gnu/store/7z33lhy9m8xqgym9w3hj30y1w290c8hn-emacs-27.1/bin/emacs -mm --no-site-file --no-site-lisp --no-x-resources --no-init-file --load /gnu/store/z2wix8r2gqs4lwwnq744qpj54051y8cy-guile-studio-0.1.0-1.93622e7/share/guile-studio.el
--8<---------------cut here---------------end--------------->8---

Unfortunately, Emacs fails to find ivy when I launch it from a
relocatable pack in a container (to ensure that the contents of the pack
are sufficient).  Here’s what I did:

    $ guix pack -RR -S /bin=bin glibc-locales guile-studio guile
    $ cp the-pack.tar.gz /tmp/test
    $ cd /tmp/test
    $ xhost +local:
    $ guix environment --container -E ^DISPLAY$ --share=/tmp/.X11-unix --ad-hoc tar gzip bash coreutils
    [env] $ tar xf the-pack.tar.gz
    [env] $ ./bin/guile-studio

I look at the value of “load-path” in Emacs and I don’t see any of the
items that are mentioned on the EMACSLOADPATH environment variable, only
things provided by Emacs itself.  “(getenv "EMACSLOADPATH")’ returns
nil.

Are shell wrappers not working when using the binary wrapper produced by
‘guix pack -RR’?

-- 
Ricardo