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nixos/kresd: fix systemd dependency cycle #33614

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merged 1 commit into from Jan 9, 2018
Merged

nixos/kresd: fix systemd dependency cycle #33614

merged 1 commit into from Jan 9, 2018

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erosennin
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Motivation for this change

kresd.service makes sockets.target depend on itself causing a dependency cycle:

$ systemd-analyze verify default.target
sockets.target: Found ordering cycle on sockets.target/start
sockets.target: Found dependency on kresd.service/start
sockets.target: Found dependency on kresd-cachedir.service/start
sockets.target: Found dependency on basic.target/start
sockets.target: Found dependency on sockets.target/start
sockets.target: Breaking ordering cycle by deleting job kresd.service/start
kresd.service: Job kresd.service/start deleted to break ordering cycle starting with sockets.target/start

As a result, kresd.service won't start on system boot. This PR fixes that.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Fits CONTRIBUTING.md.

@erosennin
nixos/kresd: fix systemd dependency cycle
f19d959 
The unnecessary dependency of sockets.target on kresd.service causes a
dependency cycle preventing kresd.service from starting at boot:

sockets.target -> kresd.service -> basic.target -> sockets.target
@vcunat vcunat self-assigned this Jan 8, 2018
@vcunat
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vcunat commented Jan 8, 2018

❤️
The service is the same as 17.09, and I think the problem doesn't happen. I'll try to look deeper tomorrow.

@vcunat
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vcunat commented Jan 9, 2018

Hmm, I get the warning but the service always starts anyway.

@vcunat vcunat merged commit f19d959 into NixOS:master Jan 9, 2018
vcunat added a commit that referenced this pull request Jan 9, 2018
@vcunat
Merge #33614: nixos/kresd improvements
d6bf8eb 
The PR was extended with other fixes.  All tested by me atop 17.09.
@vcunat
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vcunat commented Jan 9, 2018 •
edited

🆗 Added a few other improvements. Please, @mention me for anything related to knot-resolver. Feedback is welcome.

@erosennin
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Thanks for the fast response!

@erosennin erosennin deleted the kresd-ordering-cycle branch January 24, 2018 12:29
@jbboehr
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jbboehr commented Jan 30, 2018

Is this going to be backported to 17.09?

vcunat pushed a commit that referenced this pull request Jan 31, 2018
@erosennin @vcunat
nixos/kresd: fix systemd dependency cycle (#33614)
f705efa 
The unnecessary dependency of sockets.target on kresd.service causes a
dependency cycle preventing kresd.service from starting at boot:

sockets.target -> kresd.service -> basic.target -> sockets.target

(cherry picked from commit f19d959)
@vcunat
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vcunat commented Jan 31, 2018

Right, done.

@jbboehr
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jbboehr commented Jan 31, 2018

Thanks!

@Centaurioun Centaurioun mentioned this pull request Mar 2, 2023
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@vcunat vcunat vcunat approved these changes

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@erosennin @vcunat @jbboehr @GrahamcOfBorg