Re: Search paths in packages

[Ludovic Courtès]

Hi Roel,

Roel Janssen <address@hidden> skribis:

> I have a question about how search paths are handled in Guix.
> So, I have a package that tries to set an environment variable:
> DRMAA_LIBRARY_PATH.
>
> So, I tried:
> (native-search-paths
>      (list (search-path-specification
>             (variable "DRMAA_LIBRARY_PATH")
>             (files '("lib/libdrmaa.so")))))

If you want to match a regular file instead of a directory (the
default), you must write:

  (search-path-specification
    (variable "DRMAA_LIBRARY_PATH")
    (files '("lib/libdrmaa.so"))
    (file-type 'regular))

This will match all the lib/libdrmaa.so files found in the environment.

> But after running:
> $ guix environment --container --ad-hoc <the-package> bash coreutils
>
> ... the DRMAA_LIBRARY_PATH is not set.

That’s because none of the packages listed after --ad-hoc contains a
lib/libdrmaa.so file.

You can do this experiment with GIT_SSL_CAINFO:

--8<---------------cut here---------------start------------->8---
$ guix environment -C --ad-hoc git coreutils -- env |grep GIT
GIT_EXEC_PATH=/gnu/store/m5baadh2m4kgvzgxc5m3phw9f6pyhwnv-profile/libexec/git-core
$ guix environment -C --ad-hoc git coreutils nss-certs -- env |grep GIT
GIT_SSL_CAINFO=/gnu/store/x6f5ywznnjzwa81a3g7rcs5riippx2zh-profile/etc/ssl/certs/ca-certificates.crt
GIT_EXEC_PATH=/gnu/store/x6f5ywznnjzwa81a3g7rcs5riippx2zh-profile/libexec/git-core
--8<---------------cut here---------------end--------------->8---

In the first run, there was no etc/ssl/ca-certificates.crt file, so
GIT_SSL_CAINFO was undefined.

HTH!

Ludo’.