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nixos/btrfs: Add mkfs.btrfs to initrd #478318

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nixos/btrfs: Add mkfs.btrfs to initrd #478318

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@provokateurin provokateurin commented Jan 9, 2026

Allows using mkfs.btrfs inside the initrd. Symlinking to btrfs does not work like it does with btrfsck/fsck.btrfs.

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  • Built on platform:
    • x86_64-linux
    • aarch64-linux
    • x86_64-darwin
    • aarch64-darwin
  • Tested, as applicable:
  • Ran nixpkgs-review on this PR. See nixpkgs-review usage.
  • Tested basic functionality of all binary files, usually in ./result/bin/.
  • Nixpkgs Release Notes
    • Package update: when the change is major or breaking.
  • NixOS Release Notes
    • Module addition: when adding a new NixOS module.
    • Module update: when the change is significant.
  • Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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@provokateurin provokateurin requested a review from 7c6f434c January 9, 2026 07:31
@nixpkgs-ci nixpkgs-ci bot added 10.rebuild-linux: 1-10 This PR causes between 1 and 10 packages to rebuild on Linux. 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin. 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 Jan 9, 2026
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7c6f434c commented Jan 9, 2026

Shouldn't this be conditional on wanting to run mkfs from initrd?

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provokateurin commented Jan 9, 2026

Maybe. I just submitted this because I thought it might be useful, but I can also close the PR if this change is not desirable (e.g. due to larger initrd size).

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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/` 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin. 10.rebuild-linux: 1-10 This PR causes between 1 and 10 packages to rebuild on Linux.

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