add documentation for disko-install

docs/INDEX.md

@@ -8,6 +8,7 @@
 - [Quickstart](./quickstart.md)
 - [System Requirements](./requirements.md)
 - [How to Guide](./HowTo.md)
+- [Disko-Install](./disko-install.md)
 - [Support Matrix](./supportmatrix.md)
 - [Reference](./reference.md)
 - [Upgrade Guide](./upgrade-guide.md)

docs/disko-install.md

@@ -0,0 +1,113 @@
+# Disko-install
+
+Disko-install enhances the normal `nixos-install` with disko's partitioning feature.
+It can be started from the NixOS installer but it can also be used to create bootable USB-Sticks from your normal workstation.
+Furthermore `disko-install` has a mount mode that will only mount but not destroy existing partitions.
+The mount mode can be used to mount and repair existing NixOS installations.
+This document provides a comprehensive guide on how to use Disko-Install, including examples for typical usage scenarios.
+
+## Requirements
+
+- a Linux system with Nix installed.
+- a target disk or partition for the NixOS installation.
+- a Nix flake that defines your desired NixOS configuration.
+
+## Usage
+
+### Fresh Installation
+
+For a fresh installation, where Disko-Install will handle partitioning and setting up the disk, use the following syntax:
+
+```console
+sudo nix run 'github:nix-community/disko#disko-install' -- --flake <flake-url>#<flake-attr> --disk <disk-name> <disk-device>
+```
+
+Example:
+
+First run `nixos-generate-config --root /tmp/config --no-filesystems` and
+edit `configuration.nix` to your liking.
+
+Than add the following `flake.nix` inside `/tmp/config/etc/nixos`.
+In this example we assume a system that has been booted with EFI:
+
+```nix
+{
+  inputs.nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  inputs.disko.url = "github:nix-community/disko";
+  inputs.disko.inputs.nixpkgs.follows = "nixpkgs";
+
+  outputs = { self, disko, nixpkgs }: {
+    nixosConfigurations.mymachine = nixpkgs.legacyPackages.x86_64-linux.nixos [
+      ./configuration.nix
+      disko.nixosModules.disko
+      {
+        disko.devices = {
+          disk = {
+            main = {
+              # When using disko-install, we will overwrite this value from the commandline
+              device = "/dev/disk/by-id/some-disk-id";
+              type = "disk";
+              content = {
+                type = "gpt";
+                partitions = {
+                  MBR = {
+                    type = "EF02"; # for grub MBR
+                    size = "1M";
+                  };
+                  ESP = {
+                    type = "EF00";
+                    size = "500M";
+                    content = {
+                      type = "filesystem";
+                      format = "vfat";
+                      mountpoint = "/boot";
+                    };
+                  };
+                  root = {
+                    size = "100%";
+                    content = {
+                      type = "filesystem";
+                      format = "ext4";
+                      mountpoint = "/";
+                    };
+                  };
+                };
+              };
+            };
+          };
+        };
+      }
+    ];
+  };
+}
+```
+
+Identify the device name that you want to install NixOS to:
+
+```console
+$ lsblk
+NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
+sda           8:0    1 14.9G  0 disk
+└─sda1        8:1    1 14.9G  0 part
+zd0         230:0    0   10G  0 disk
+├─zd0p1     230:1    0  500M  0 part
+└─zd0p2     230:2    0  9.5G  0 part /mnt
+nvme0n1     259:0    0  1.8T  0 disk
+├─nvme0n1p1 259:1    0    1G  0 part /boot
+├─nvme0n1p2 259:2    0   16M  0 part
+├─nvme0n1p3 259:3    0  250G  0 part
+└─nvme0n1p4 259:4    0  1.6T  0 part
+```
+
+In our example, we want to install to a USB-stick (/dev/sda):
+
+```console
+$ sudo nix run 'github:nix-community/disko#disko-install' -- --flake '/tmp/config/etc/nixos#mymachine' --disk main /dev/sda
+```
+
+Afterwards you can test your USB-stick by either selecting during the boot
+or attaching it to a qemu-vm:
+
+```
+$ sudo qemu-kvm -enable-kvm -hda /dev/sda
+```