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Merge pull request #156 from usertam/master

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README.md: update cross compiling section
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@ -98,13 +98,52 @@ NIX_PATH=nixpkgs=../nixpkgs nixos-generate -f do
## Cross Compiling
To cross compile nixos images for other system you have
to configure `boot.binfmtMiscRegistrations` on your host system.
To cross compile nixos images for other architectures you have to configure
`boot.binfmt.emulatedSystems` or `boot.binfmt.registrations` on your host system.
For more details about this have a look at :
In your system `configuration.nix`:
```nix
{
# Enable binfmt emulation of aarch64-linux.
boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
}
```
Alternatively, if you want to target other architectures:
```nix
# Define qemu-arm-static source.
let qemu-arm-static = pkgs.stdenv.mkDerivation {
name = "qemu-arm-static";
src = builtins.fetchurl {
url = "https://github.com/multiarch/qemu-user-static/releases/download/v6.1.0-8/qemu-arm-static";
sha256 = "06344d77d4f08b3e1b26ff440cb115179c63ca8047afb978602d7922a51231e3";
};
dontUnpack = true;
installPhase = "install -D -m 0755 $src $out/bin/qemu-arm-static";
};
in {
# Enable binfmt emulation of extra binary formats (armv7l-linux, for exmaple).
boot.binfmt.registrations.arm = {
interpreter = "${qemu-arm-static}/bin/qemu-arm-static";
magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'';
mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff'';
};
# Define additional settings for nix.
nix.extraOptions = ''
extra-platforms = armv7l-linux
'';
nix.sandboxPaths = [ "/run/binfmt/arm=${qemu-arm-static}/bin/qemu-arm-static" ];
}
```
For more details on configuring `binfmt`, have a look at:
[binfmt options](https://search.nixos.org/options?channel=unstable&query=boot.binfmt),
[binfmt.nix](https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/system/boot/binfmt.nix),
[this comment](https://github.com/NixOS/nixpkgs/issues/109661#issuecomment-762629438) and
[clevers qemu-user](https://github.com/cleverca22/nixos-configs/blob/master/qemu.nix).
Once you've run `nixos-rebuild` with theses options,
Once you've run `nixos-rebuild` with these options,
you can use the `--system` option to create images for other architectures.
## Using in a Flake