the `devmode` helper made for the Nixpkgs/NixOS manual was exposed wrapped
in `mkShell`, which made it impossible to reuse.
this change strips that wrapper and reproduces it at the call site.
now one can use `devmode` from anywhere Nixpkgs is available:
devmode = pkgs.callPackage "${pkgs.path}/pkgs/tools/nix/web-devmode.nix" {
buildArgs = toString ./.;
open = "/index.html";
};
`lib.trivial.revisionWithDefault` will change with every Git commit, which causes the manual to be rebuilt on every since PR.
Using `nixpkgs.rev` (or the dummy value "master" if it's not present) means that the manual will contain the revision if built on Hydra, but will not otherwise.
Why?
1. https://hydra.nixos.org/jobset/nixos/trunk-combined#tabs-configuration shows that `pkgs/top-level/release.nix` is passed the `nixpkgs` attrset, which is a "Git checkout".
2. Git checkouts come from [`builtins.fetchGit`](https://nix.dev/manual/nix/2.18/language/builtins#builtins-fetchGit) and include the `rev` attribute.
3. The `rev` attribute is what `lib.trivial.revisionWithDefault` would have returned.
So, using `nixpkgs.rev or "master"` exclusively will cause the rebuilds on every commit to cease, but will allow "official" nixpkgs manual built on Hydra to continue to reference a specific commit.
