bug#39925: `guix pull` failure in multi-machine setup

[Lars-Dominik Braun]

Hi,

I’m using guix on a multi-machine setup with a single remote guix-daemon that
can be reached via SSH. Thus GUIX_DAEMON_SOCKET=ssh://master.<domain> on the
compute nodes. Running `guix pull` on master works fine (the variable is not
set here), but it does not on a compute node. Instead it fails with this error:

---snip---
Backtrace:
           1 (primitive-load 
"/gnu/store/n5wgvz287dwm62474mr42x34wl5j5wh7-compute-guix-derivation")
In ice-9/eval.scm:
   293:34  0 (_ #(#(#(#(#(#(#(#(#(#(#(#(#<directory (guile-user) 7f19dd213140> 
(?)) #) # ?) ?) ?) ?) ?) ?) ?) ?) ?) ?))

ice-9/eval.scm:293:34: Throw to key `srfi-34' with args `(#<condition 
&store-connection-error [file: "/var/guix/daemon-socket/socket" errno: 111] 
7f19dba3a090>)'.
guix pull: error: You found a bug: the program 
'/gnu/store/n5wgvz287dwm62474mr42x34wl5j5wh7-compute-guix-derivation'
failed to compute the derivation for Guix (version: 
"aac148a87b9a79b9992b8b1a9d76c217175d4a88"; system: "x86_64-linux";
host version: "aac148a87b9a79b9992b8b1a9d76c217175d4a88"; pull-version: 1).
Please report it by email to <address@hidden>.
---snap---

Obviously the socket on that compute machine is not working, because it’s on an
NFS share /var/guix belonging to master. But why is the socket considered in
the first place?

Cheers,
Lars

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