bug#63868: [reconfigure, shepherd] error: remove: unbound variable

[Attila Lendvai]

$ sudo guix system reconfigure ...
[...]
building 
/gnu/store/8by5a6wqlxm3fw27xh3a6zzzwfczjpcm-install-bootloader.scm.drv...
guix system: bootloader successfully installed on '(/boot/efi)'
guix system: warning: exception caught while executing 'eval' on service 'root':
error: remove: unbound variable
guix system: warning: some services could not be upgraded
hint: To allow changes to all the system services to take effect, you will need 
to reboot.

$

(notice the empty line before the prompt; may or may not be relevant)

this is all foggy.  the only certain part is that i get the above printed with 
a recent commit, but when i rolled back the guix channel to:

(commit "f9af75b2c34aab564c821b5bacebd8570777a535")

then it finished without the above error.

when it happens it also seems to break booting. it hang rather early, not long 
after grub.

it's happening on a server where i'd like to keep downtime low, so i didn't do 
double checks. i just rolled back, reconfigured, and it worked afterwards.

HTH,

-- 
• attila lendvai
• PGP: 963F 5D5F 45C7 DFCD 0A39
--
“Choice implies consciousness - a high degree of consciousness. Without it, you 
have no choice. Choice begins the moment you disidentify from the mind and its 
conditioned patterns, the moment you become present....Nobody chooses 
dysfunction, conflict, pain. Nobody chooses insanity. They happen because there 
is not enough presence in you to dissolve the past, not enough light to dispel 
the darkness. You are not fully here. You have not quite woken up yet. In the 
meantime, the conditioned mind is running your life.”
        — Eckhart Tolle (1948–)