Heads-up: ‘guix system reconfigure’ reloads services

Heads-up: ‘guix system reconfigure’ reloads services

[Ludovic Courtès]

Hi!

If you haven’t been following <http://bugs.gnu.org/22039>, ‘guix system
reconfigure’ is now able to dynamically load/start new system services,
unless they are already running.

This works by talking to shepherd in a way similar to what ‘herd’ does,
querying the list of current services and then dynamically loading new
services in there (the interesting part ;-)).

This is very conservative, so it shouldn’t bring your system down.  :-)
Errors in service definitions are caught when they are loaded.

Anyway, if you notice something fishy, please report it, including info
on the initial and target state of system services.

Ludo’.

Re: Heads-up: ‘guix system reconfigure’ reloads services

[Ludovic Courtès]

ludo@gnu.org (Ludovic Courtès) skribis:

> If you haven’t been following <http://bugs.gnu.org/22039>, ‘guix system
> reconfigure’ is now able to dynamically load/start new system services,
> unless they are already running.

On IRC calher & Jookia reported that, when upgrading from dmd, this
would cause this kind of error:

--8<---------------cut here---------------start------------->8---
populating /etc from /gnu/store/z7x13js9dpinlrq92l1d5hnfn2gn765s-etc...
usermod: no changes
usermod: no changes
usermod: no changes
usermod: no changes
usermod: no changes
usermod: no changes
usermod: no changes
usermod: no changes
usermod: no changes
making '/gnu/store/7z97a0h5gyqkxil4qdnknii00xva6brz-system' the current system...
guix system: warning: cannot connect to /var/run/shepherd/socket: No such file or directory
Backtrace:
In ice-9/boot-9.scm:
 157: 16 [catch #t #<catch-closure 18977a0> ...]
In unknown file:
   ?: 15 [apply-smob/1 #<catch-closure 18977a0>]
In ice-9/boot-9.scm:
  63: 14 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 13 [eval # #]
In ice-9/boot-9.scm:
2401: 12 [save-module-excursion #<procedure 18b4940 at ice-9/boot-9.scm:4045:3 ()>]
4050: 11 [#<procedure 18b4940 at ice-9/boot-9.scm:4045:3 ()>]
1724: 10 [%start-stack load-stack ...]
1729: 9 [#<procedure 18ccea0 ()>]
In unknown file:
   ?: 8 [primitive-load "/gnu/store/24mbii9wjlyzfzsqwfmcvz6vz2fv5n6g-guix-0.9.0.c3f29bc/bin/.guix-real"]
In guix/ui.scm:
1177: 7 [run-guix-command system "reconfigure" "/etc/config.scm"]
In ice-9/boot-9.scm:
 157: 6 [catch srfi-34 #<procedure 4090de0 at guix/ui.scm:413:2 ()> ...]
 157: 5 [catch system-error ...]
In guix/scripts/system.scm:
 689: 4 [process-action reconfigure ("/etc/config.scm") ...]
In guix/store.scm:
1061: 3 [run-with-store # ...]
In guix/scripts/system.scm:
 508: 2 [#<procedure 4c10f00 at guix/scripts/system.scm:508:13 (state)> #]
 293: 1 [#<procedure 7117300 at guix/scripts/system.scm:274:2 (state)> #]
 233: 0 [upgrade-shepherd-services #]

guix/scripts/system.scm:233:2: In procedure upgrade-shepherd-services:
guix/scripts/system.scm:233:2: Throw to key `vm-error' with args `(vm-run "Too few values returned to continuation" ())'.
--8<---------------cut here---------------end--------------->8---

This is fixed by commit 1d6b7d5.

Ludo’.