With the Nix package manager with flake support installed run
nix build .#nixosConfigurations.sysprog-vm.config.system.build.virtualBoxOVA
Afterwards you will find the built image inside the result/ subfolder.
These steps help you set up the Nix package manager with support for a experimental more user-friendly command language and a defined package format called flakes that makes it easier to create builds in a strictly determined environment, so that they create the same outputs on various machines or in CI.
The described install is a multi-user install, which is recommended. If you want to know more you can read the install section in the Nix manual directly or take a look at the official install page at https://nixos.org/download.html.
Run the following command with sudo but not directly as root:
$ sh <(curl -L https://nixos.org/nix/install) --daemon
Note that you can also download the shell script first and inspect it before you run it.
You might have to re-open your terminals, restart your graphical session or even reboot after this step.
First run the following comand
nix-env -iA nixpkgs.nixFlakes
and then add the following lines to /etc/nix/nix.conf
experimental-features = nix-command flakes
You might have to re-open your terminals, restart your graphical session or even reboot after this step.
The following command should now give similar output.
$ nix flake --help
Usage: nix flake COMMAND FLAGS... ARGS...
Common flags:
Available commands:
archive copy a flake and all its inputs to a store
check check whether the flake evaluates and run its tests
clone clone flake repository
info list info about a given flake
init create a flake in the current directory from a template
list-inputs list flake inputs
new create a flake in the specified directory from a template
show show the outputs provided by a flake
update update flake lock file
Note: this program is EXPERIMENTAL and subject to change.