What else could set the GUIX_PROFILE variable?

[Adam McCartney via <help-guix@gnu.org>]

Hi Guix,

Does something set the GUIX_PROFILE variable to $HOME/.guix-home/profile by 
deafault?

So I've been scratching my head about this today. It may be obvious to someone
else what is happening. I'm running guix ad a foreign distro on a number of 
machines, others are guix system on one. Some use a profile that exists in 
'~/.guix-home/profile' others rely on '.guix-extra-profiles/$(hostname)/$(hostname)'. 

I can observe the following behaviour on a "foreign distro" that uses a profile
defined by the hostname of the system.

I define a small function in my bashrc that checks to see what one is active.
```
# .bashrc

function guix_activate_profile() {
     # Check for a "host" profile
     # Set it if it exists
     if [ -d "$HOME/.guix-extra-profiles/$(hostname)/$(hostname)" ]; then
         export GUIX_PROFILE="$HOME/.guix-extra-profiles/$(hostname)/$(hostname)"
         . "$GUIX_PROFILE/etc/profile"
     elif [ -d "$HOME/.guix-home/profile" ]; then
         echo "default to ~/.guix-home/profile"
         export GUIX_PROFILE="$HOME/.guix-home/profile"
         . "$GUIX_PROFILE/etc/profile"
     fi
}


if [ -z ${GUIX_PROFILE} ]; then # none active
     guix_activate_profile  # try to activate host profile
fi
```

After I login and start a terminal emulator, everything appears to be
hunky dory:

```
amccartn@mc ~
> echo $GUIX_PROFILE
/home/amccartn/.guix-extra-profiles/mc/mc
```

As soon as I start a tmux session, something mysteriously sets the GUIX_PROFILE 
to $HOME/.guix-home/profile. And the original control loop in my bashrc doesn't run.

```
> echo $GUIX_PROFILE
/home/amccartn/.guix-home/profile
amccartn@mc ~
> guix package --list-profiles
/home/amccartn/.guix-extra-profiles/mc/mc
/home/amccartn/.config/guix/current
/home/amccartn/.guix-profile
```

Note that the guix home profile doesn't exist on the machine!
```
amccartn@mc ~
> ls -l $HOME/.guix-home/profile
ls: cannot access '/home/amccartn/.guix-home/profile': No such file or directory
```

I realize that the problem goes away if I remove the control block. So maybe 
it's just a logic error on my part. I'd still like to know what is setting the 
GUIX_PROFILE to $HOME/.guix-home/profile when I launch tmux.


Thanks!
Adam

-- 
  Adam McCartney - https://admccartney.mur.at 
/