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I don't understand profiles and directories

From: HiPhish
Subject: I don't understand profiles and directories
Date: Sat, 19 Jan 2019 17:13:48 +0100

Hello everyone,

I am running Kubuntu 18.04 with Guix as my other package manager. I originally 
installed it when Guix was still in version 0.15 and I ran in a bunch of 
trouble when I tried updating to 0.16. I am still not sure I updated properly.

>From what I understand, Guix works as follows: packages are "installed" in the 
store, which is a directory that has separate directories for each package. 
This allows users to have different versions of the same package installed at 
the same time, no two packages will interfere with each other, since each one 
has its own subdirectory in the store.

This however does not make packages available to the user, so this is where 
profiles come in. A profile is a directory which contains symlinks to the 
store items. So if I want to run "foo-bin" it first has to be built and placed 
in the store, and then Guix will symlink everything into my profile. I also 
need to set some environment variables so that my system will know where to 
search. If foo-bin depends on libbar, then libbar will be installed into the 
store as well, but it will not be symlinked into the profile because I did not 
request it explicitly. Everything correct so far?

Here is my first question: where is this profile and which environment 
do I need to set? There is the directory `~/.guix-profile`, so I assume that's 
my "default profile". When I ran `guix pull` it did not update my Guix binary, 
As per the Guix Pull manual, I first had to add

    export PATH="$HOME/.config/guix/current/bin:$PATH"
    export INFOPATH="$HOME/.config/guix/current/share/info:$INFOPATH"

to my `~/.profile` file. Is `$HOME/.config/guix/current` another profile? Is 
the actual profile I should be using? Other parts of the manual instructed me 
to add

    source "$HOME/.guix-profile/etc/profile"
    export GUIX_LOCPATH="$HOME/.guix-profile/lib/locale"
    export XDG_DATA_DIRS="$HOME/.guix-profile/share:${XDG_DATA_DIRS}"

as well. Is this the correct setup, or am I missing something? Because when I 
install a package (e.g. glibc-locales) I get the message

    The following environment variable definitions may be needed:
       export PATH="/home/username/.guix-profile/bin${PATH:+:}$PATH"
       export GUILE_LOAD_PATH="/home/username/.guix-profile/share/guile/site/
       export GUILE_LOAD_COMPILED_PATH="/home/username/.guix-profile/lib/guile/

and running `guix --version` shows me 0.15 again. So something seems to be 
amiss here.

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