Where is nixos-rebuild defined?

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1

I would like to take a look at the source code of nixos-rebuild, but I cannot find it.
It used to be at nixpkgs/pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh, but it is not anymore.
Where is it defined now?

2

it was rewritten in python.

$ ls -alFh $(which nixos-rebuild)
lrwxrwxrwx 1 root root 84 Jan  1  1970 /run/current-system/sw/bin/nixos-rebuild -> /nix/store/0l30zirmk72zlmqz8309vpj188i634i7-nixos-rebuild-ng-26.05/bin/nixos-rebuild
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