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profile symlink structure

From: vapnik spaknik
Subject: profile symlink structure
Date: Sun, 24 May 2020 15:23:43 +0000 (UTC)

    please could someone help me understand how guix organizes profile symlinks?
I can't find a full explanation anywhere.
So far I have figured out the following on my foreign distro:

- original profile directories are named like: /gnu/store/<UID>-profile
- /var/guix/profiles/per-user/<USR>/ contains symlinks to the profiles in 
/gnu/store associated with user <USR>
- symlinks in /var/guix/profiles/per-user/<USR>/ seem to take one of the 
following forms:


the ones with a number <N> in their name refer to the <N>th generation of a 
profile with the same name apart from the <N>-link part. 
 - "guix-profile" is a symlink to the currently used generation for the profile 
used by "guix package" for the user
 - "current-guix" is a symlink to the currently used generation for the profile 
used by "guix pull" for the user
 - ~/.guix-profile is a symlink to the current profile used by "guix package", 
i.e. /var/guix/profiles/per-user/<USR>/guix-profile
 - ~/.config/guix/current is a symlink to the profile used by "guix pull" 

Now this is where I'm confused.. I was expecting ~/.config/guix/current to link 
to /var/guix/profiles/per-user/<USR>/current-guix where <USR> is the current 
user. However, in my case it links to 
/var/guix/profiles/per-user/root/current-guix, i.e. the profile for the root 
user, even though there are several "current-guix" symlinks for <USR>, i.e. 
links of the form /var/guix/profiles/per-user/<USR>/current-guix*.
Could this be due to running "sudo guix pull" or "sudo -i guix pull"?

Also, what determines which profile symlinks are placed in 
/var/guix/gcroots/auto? I read elsewhere that these symlinks will be 
automatically removed as soon as any of them are broken. 
In my case that directory only contains symlinks to 
/var/guix/profiles/per-user/*/current-guix* symlinks, one of which is missing 
(/var/guix/profiles/per-user/root/current-guix-1-link), and there is another 
link to ~/.config/guix/current-1-link which itself links directly to a profile 
in /gnu/store

I suspect that the previously mentioned anomalies are the reason why "guix 
pull" fails for me with the following error when run as <USR>:

> guix pull: error: symlink: File exists: 
> "/var/guix/profiles/per-user/<USR>/current-guix-1-link" 

and which may have been caused by interrupting a "guix pull".

I guess I can probably fix that problem by deleting current-guix-1-link, but I 
would really like to know how the symlinking works exactly, so that I'm 
prepared for potential future problems of this kind. 


Joe Bloggs

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