disko/README.md

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# disko - Declarative disk partitioning
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[Documentation Index](./docs/INDEX.md)
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NixOS is a Linux distribution where everything is described as code, with one
exception: during installation, the disk partitioning and formatting are manual
steps. **disko** aims to correct this sad 🤡 omission.
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This is especially useful for unattended installations, re-installation after a
system crash or for setting up more than one identical server.
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## Overview
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**disko** can either be used after booting from a NixOS installer, or in
conjunction with [nixos-anywhere](https://github.com/numtide/nixos-anywhere) if
you're installing remotely.
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Before using **disko**, the specifications of the disks, partitions, type of
formatting and the mount points must be defined in a Nix configuration. You can
find [examples](./example) of typical configurations in the Nix community
repository, and use one of these as the basis of your own configuration.
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You can keep your configuration and re-use it for other installations, or for a
system rebuild.
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**disko** is flexible, in that it supports most of the common formatting and
partitioning options, including:
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- Disk layouts: GPT, MBR, and mixed.
- Partition tools: LVM, mdadm, LUKS, and more.
- Filesystems: ext4, btrfs, ZFS, bcachefs, tmpfs, and others.
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It can work with these in various configurations and orders, and supports
recursive layouts.
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## How to use disko
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Disko doesn't require installation: it can be run directly from nix-community
repository. The [Quickstart Guide](./docs/quickstart.md) documents how to run
Disko in its simplest form when installing NixOS.
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For information on other use cases, including upgrading from an older version of
**disko**, using **disko** without NixOS and downloading the module, see the
[How To Guide](./docs/HowTo.md)
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For more detailed options, such as command line switches, see the
[Reference Guide](./docs/reference.md)
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To access sample configurations for commonly-used disk layouts, refer to the
[examples](./example) provided.
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## Sample Configuration and CLI command
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A simple disko configuration may look like this:
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```nix
{
disko.devices = {
disk = {
 my-disk = {
  device = "/dev/sda";
  type = "disk";
  content = {
   type = "gpt";
   partitions = {
    ESP = {
type = "EF00";
     size = "500M";
     content = {
      type = "filesystem";
      format = "vfat";
      mountpoint = "/boot";
     };
    };
    root = {
     size = "100%";
     content = {
      type = "filesystem";
      format = "ext4";
      mountpoint = "/";
     };
    };
   };
  };
 };
};
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};
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}
```
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If you'd saved this configuration in /tmp/disko-config.nix, and wanted to create
a disk named /dev/sda, you would run the following command to partition,
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format and mount the disk.
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```console
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sudo nix --experimental-features "nix-command flakes" run github:nix-community/disko -- --mode disko /tmp/disko-config.nix
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```
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## Related Tools
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This tool is used by
[nixos-anywhere](https://github.com/numtide/nixos-anywhere), which carries out a
fully-automated remote install of NixOS.
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We also acknowledge https://github.com/NixOS/nixpart, the conceptual ancestor of
this project.
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## Licensing and Contribution details
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This software is provided free under the
[MIT Licence](https://opensource.org/licenses/MIT).
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If you would like to become a contributor, please see our
[contribution guidelines.](https://github.com/numtide/docs/contribution-guidelines.md)
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---
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This project is supported by [Numtide](https://numtide.com/).
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We are a team of independent freelancers that love open source.  We help our
customers make their project lifecycles more efficient by:
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- Providing and supporting useful tools such as this one
- Building and deploying infrastructure, and offering dedicated DevOps support
- Building their in-house Nix skills, and integrating Nix with their workflows
- Developing additional features and tools
- Carrying out custom research and development.
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[Contact us](https://numtide.com/contact) if you have a project in mind, or if
you need help with any of our supported tools, including this one. We'd love to
hear from you.