Re: tramp (2.5.1.3 nil/nil); Add Guix System remote path

[Vivien Kraus]

Hello Michael,

Le samedi 09 octobre 2021 à 17:17 +0200, Michael Albinus a écrit :
> > Guix system stores system-installed packages in
> > 
> >    "/run/current-system/profile/bin" "/run/current-
> > system/profile/sbin"
> > 
> > Unfortunately, getconf is unable to produce useful results on a
> > Guix
> > System server.
> > 
> > In:
> > 
> > https://guix.gnu.org/manual/devel/en/guix.html#operating_002dsystem-Reference
> > 
> > you see that the system-installed packages [are] "installed in the
> > global profile, which is accessible at /run/current-
> > system/profile."
> > 
> > Would you please add these paths to the default?
> 
> It will be a pleasure for me to expand tramp-default-remote-path to
> guix
> specific paths. When "getconf PATH" doesn't work properly, we need
> another indiciation for guix. What does "uname -sr" return on a guix
> system? Or is there something else which helps us to determine a guix
> system?
Guix does not create /etc/os-release, and uname -sr returns "Linux
<kernel version>" on my server. The most reliable thing would be to
check if /run/current-system/configuration.scm exists (or
.../provenance, or .../channels.scm):

https://guix.gnu.org/manual/devel/en/guix.html#provenance_002dservice_002dtype

This service (that creates these files) is enabled by default, but it
can be turned off (so, maybe the files are missing but the system
programs are still in /run/current-system/profile/). However, it should
be very commonly enabled.

Is it not possible to just test for the existence of the /run/current-
system/profile/bin (and .../sbin if needed) directory? I’m not familiar
with the tramp code base, why should tramp even know it is connecting
to a guix system server? I thought it would just set the PATH to all
possible default candidates and let the remote shell decide. Is it not
the case?

Vivien