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switch-to-configuration-ng: Better handling of socket-activated units #359724

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@antifuchs antifuchs commented Nov 28, 2024

Previously, if any unit had a socket associated with it, stc-ng counted it as "socket-activated", meaning that the unit would get stopped and the socket get restarted. That can wreak havoc on units like systemd-udevd and systemd-networkd.

Instead, let units set the new flag notSocketActivated, which sets a boolean on the unit indicating to stc-ng that the unit wants to be treated like any other non-socket-activated unit instead. That will stop/start or restart these units on upgrades, without unnecessarily tearing down any machinery that the system needs to run.

This addresses what @ElvishJerricco and I thought was a systemd bug (systemd/systemd#35371) but is really a bug in how socket-activated services are handled in stc (and -ng).

Things done

  • Built on platform(s)
    • x86_64-linux
    • aarch64-linux
    • x86_64-darwin
    • aarch64-darwin
  • For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
    • sandbox = relaxed
    • sandbox = true
  • Tested, as applicable:
  • Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
  • Tested basic functionality of all binary files (usually in ./result/bin/)
  • 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
    • (Package updates) Added a release notes entry if the change is major or breaking
    • (Module updates) Added a release notes entry if the change is significant
    • (Module addition) Added a release notes entry if adding a new NixOS module
  • Fits CONTRIBUTING.md.

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Previously, if any unit had a socket associated with it, stc-ng
counted it as "socket-activated", meaning that the unit would get
stopped and the socket get restarted. That can wreak havoc on units
like systemd-udevd and systemd-networkd.

Instead, let units set the new flag notSocketActivated, which sets a
boolean on the unit indicating to stc-ng that the unit wants to be
treated like any other non-socket-activated unit instead. That will
stop/start or restart these units on upgrades, without unnecessarily
tearing down any machinery that the system needs to run.
@github-actions github-actions bot added 6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` labels Nov 28, 2024
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6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/`
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