Multiple substitute servers question

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

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Hello Guix!

I'm using both the default substitute server (mirrors.hydra.gnu.org) as
well as the recently added bayfront.guixsd.org[1], and today when I tried to
issue 'guix environment guix' I got:

--8<---------------cut here---------------start------------->8---

[...]

;;; note: source file /home/maxim/.config/guix/latest/gnu/packages/tmux.scm
;;;       newer than compiled /home/maxim/.config/guix/latest/gnu/packages/tmux.go
;;; note: source file /home/maxim/.config/guix/latest/gnu/packages/tmux.scm
;;;       newer than compiled /gnu/store/v83285dvjy923ikq1dddncixb6kfba0k-guix-0.12.0-5.1162/share/guile/site/2.0/gnu/packages/tmux.go
Downloading https://bayfront.guixsd.org/nar/c64n03yy6kk66ah7x7pghpx2zc62j8d0-subversion-1.8.17.tar.bz2 (6.6MiB installed)...
guix substitute: error: connect: No route to host
killing process 7274
guix environment: error: build failed: some substitutes for the outputs of derivation `/gnu/store/2yl7ck1dzi32jb4aiqr2hhqxx90qkfxh-subversion-1.8.17.tar.bz2.drv' failed (usually happens due to networking issues); try `--fallback' to build derivation from source 
--8<---------------cut here---------------end--------------->8---

Given that issuing 'guix environment guix
--substitute-urls=mirrors.hydra.gnu.org' produces something different
(but unfortunately equally broken):

--8<---------------cut here---------------start------------->8---
;;; note: source file /home/maxim/.config/guix/latest/gnu/packages/tmux.scm
;;;       newer than compiled /home/maxim/.config/guix/latest/gnu/packages/tmux.go
;;; note: source file /home/maxim/.config/guix/latest/gnu/packages/tmux.scm
;;;       newer than compiled /gnu/store/v83285dvjy923ikq1dddncixb6kfba0k-guix-0.12.0-5.1162/share/guile/site/2.0/gnu/packages/tmux.go
substitute: Backtrace:
substitute: In ice-9/boot-9.scm:
substitute:  160: 9 [catch #t #<catch-closure 268ab40> ...]
substitute: In unknown file:
substitute:    ?: 8 [apply-smob/1 #<catch-closure 268ab40>]
substitute: In ice-9/boot-9.scm:
substitute:   66: 7 [call-with-prompt prompt0 ...]
substitute: In ice-9/eval.scm:
substitute:  432: 6 [eval # #]
substitute: In ice-9/boot-9.scm:
substitute: 2404: 5 [save-module-excursion #<procedure 26aa900 at ice-9/boot-9.scm:4051:3 ()>]
substitute: 4056: 4 [#<procedure 26aa900 at ice-9/boot-9.scm:4051:3 ()>]
substitute: 1727: 3 [%start-stack load-stack ...]
substitute: 1732: 2 [#<procedure 26beb70 ()>]
substitute: In unknown file:
substitute:    ?: 1 [primitive-load "/gnu/store/v83285dvjy923ikq1dddncixb6kfba0k-guix-0.12.0-5.1162/bin/.guix-real"]
substitute: In guix/ui.scm:
substitute: 1228: 0 [run-guix-command substitute "--query"]
substitute: 
substitute: guix/ui.scm:1228:8: In procedure run-guix-command:
substitute: guix/ui.scm:1228:8: In procedure struct_vtable: Wrong type argument in position 1 (expecting struct): #f
guix environment: error: corrupt input while restoring archive from #<closed: file 0>
--8<---------------cut here---------------end--------------->8---

Do I understand that upon failing with bayfront the daemon doesn't
proceed (fallback) to the regular mirrors.hydra.gnu.org substitute
server?

Maxim

[1]: https://lists.gnu.org/archive/html/guix-devel/2017-01/msg01746.html

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