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nixos/repart: add loop module to initrd #278895

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merged 1 commit into from
Jan 16, 2024

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jmbaur
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@jmbaur jmbaur commented Jan 5, 2024

Description of changes

Systemd-repart will use loopback devices for partition creation if it is able to, and will fallback to doing "offline" partition creation writing data directly to files. From what I see looking at the repart code, there are specific features that cannot be taken advantage of when not using loopback devices (e.g. no BTRFS subvolumes in systemd v255) and in certain places they have to perform some manual re-sizing work that can otherwise be avoided.

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/)
  • 24.05 Release Notes (or backporting 23.05 and 23.11 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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Systemd-repart will use loopback devices for partition creation if it is
able to, and will fallback to doing "offline" partition creation writing
data directly to files. From what I see looking at the repart code,
there are specific features that cannot be taken advantage of when not
using loopback devices (e.g. no BTRFS subvolumes in systemd v255) and in
certain places they have to perform some manual re-sizing work that can
otherwise be avoided.
@nixos-discourse
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-already-reviewed/2617/1386

@ElvishJerricco ElvishJerricco added this to To Do in systemd in Stage 1 via automation Jan 16, 2024
@ElvishJerricco ElvishJerricco merged commit 66e3ec7 into NixOS:master Jan 16, 2024
23 checks passed
systemd in Stage 1 automation moved this from To Do to Done Jan 16, 2024
@jmbaur jmbaur deleted the repart-initrd-loopback branch January 16, 2024 20:42
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5 participants