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[WIP]: initialRamdisk: Use systemd for initrd's /init #74842

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@ElvishJerricco
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ElvishJerricco commented Dec 2, 2019

Motivation for this change
  • This parallelizes early boot.
  • Systemd generators like the cryptsetup and fstab ones can be used to handle mounting and prompting for passwords.
  • Plymouth can start much earlier, in early boot, making the boot graphics much cleaner.
  • Systemd services from other packages can be used.
  • systemd-ask-password can be used.

NOTE: This is a WIP. I'm opening this PR now mostly for feedback on the concept.

Things done
  • Set initrd's /init to the systemd binary.
  • Use systemctl switch-root instead of switch_root.
  • Minimize the size inflation. Currently this only inflates a base initrd by 1M. I'd like to get this down further though.
  • Switch to fstab and crypttab generators.
  • Make sure none of the NixOS tests have broken.
  • Start plymouth in initrd.
  • Use systemd for setting up the initrd network stack.
  • Offer a trivial NixOS module interface for adding packages' systemd services to initrd.
  • Use systemd's emergency.target on failure to boot.

  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • 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 nix-review --run "nix-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
@flokli

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flokli commented Dec 2, 2019

Very nice! Tackling this is on my todo list for quite some time, I'm happy to see this happening now :-)

As far as lvm and cryptsetup foo is concerned, I just polished #66856.

@bjornfor

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bjornfor commented Dec 3, 2019

Cross referencing #72401 and #72802.

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