bug#53230: Disable authentication seems broken

[Andrew Tropin]

A day ago I found out that I can't pull/time-machine from my local guix
repo with patches.  After running guix time-machine -C ./channels ...,
guix reported the following:

--8<---------------cut here---------------start------------->8---
Updating channel 'guix' from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
guix time-machine: warning: channel authentication disabled
Computing Guix derivation for 'x86_64-linux'... -
Backtrace:
          18 (primitive-load "/home/bob/.config/guix/current/bin/guix")
In guix/ui.scm:
   2206:7 17 (run-guix . _)
  2169:10 16 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1752:10 15 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
  1747:15 14 (with-exception-handler #<procedure 7f66dc8711b0 at 
ice-9/boot-9.…> …)
In guix/store.scm:
    671:3 13 (_)
In ice-9/boot-9.scm:
  1752:10 12 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
In guix/store.scm:
   658:37 11 (thunk)
In guix/status.scm:
    802:4 10 (call-with-status-report _ _)
In guix/store.scm:
   1320:8  9 (call-with-build-handler _ _)
   1320:8  8 (call-with-build-handler #<procedure 7f66dc887840 at 
guix/ui.scm:…> …)
  2123:24  7 (run-with-store #<store-connection 256.99 7f66dc829460> _ # _ # _ 
# …)
In guix/inferior.scm:
   817:16  6 (_ _)
In guix/store.scm:
  1995:38  5 (_ #<store-connection 256.99 7f66ca72bdc0>)
   1468:0  4 (add-temp-root #<store-connection 256.99 7f66ca72bdc0> 
#<derivatio…>)
In guix/serialization.scm:
   130:20  3 (write-store-path #<derivation 
/gnu/store/pqn1xr6882907b41j6mybvs…> …)
In unknown file:
           2 (string->utf8 #<derivation 
/gnu/store/pqn1xr6882907b41j6mybvsg4218…>)
In ice-9/boot-9.scm:
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure string->utf8: Wrong type argument in position 1 (expecting
string): #<derivation /gnu/store/pqn1xr6882907b41j6mybvsg4218kc0k-profile.drv =>
/gnu/store/3hc33q0xlajd75l52grsg8dg1ais2hss-profile 7f66cb7eaeb0>
--8<---------------cut here---------------end--------------->8---

Later I discovered, that the problem isn't related to my local changes,
it reproduces with main guix channel too, also, other people on their
setups reporting the same problem.

Way to reproduce:
1. Find any commit you didn't built guix for earlier.  For example a79ad5fce5.

2.1 Update guix to the latest version and do describe under time-machine: 
guix pull && guix time-machine --commit=a79ad5fce5 --disable-authentication -- 
describe

2.2 or more preciese and less invasive alternative:
guix time-machine --commit=0f869287ebf -- time-machine --commit=a79ad5fce5 
--disable-authentication -- describe


To be sure, I tried it on a separate machine with only guix channel,
which wasn't updated for a while. 2.2 failed the same way as described
at the beginning, but when I tried just:

guix time-machine --commit=a79ad5fce5 --disable-authentication -- describe

it worked.  Also, I did similiar test like in 2.1 with guix pull and
after that guix pull --roll-back, the result is the same.

Skimming throught the latest changes didn't bring any results yet.
Bisecting and building guix, will let you know, if/when I find more.

-- 
Best regards,
Andrew Tropin

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