Use flakes to run firefox-nightly without manually including overlays.

README.rst

@@ -33,6 +33,36 @@ Firefox trademark, held by Mozilla), so you will need to set
 ``nixpkgs.config.allowUnfree`` in order to use them. More info `here
 <https://nixos.wiki/wiki/FAQ#How_can_I_install_a_proprietary_or_unfree_package.3F>`_.
 
+Flake usage
+~~~~~~~~~~~
+
+Latest versions of Firefox can be started using flakes, as follows:
+
+``nix run --impure -no-write-lock-file github:mozilla/nixpkgs-mozilla?dir=flakes/nixos-22.11#firefox-nightly``
+
+- The ``--impure`` command line argument is used to allow pulling the latest
+  pre-built version of Firefox from `archive.mozilla.org`, and checking for the
+  correct binary signature.
+
+- The ``--no-write-lock-file`` command line argument is to work-around the fact
+  that this repository does not include lock files. This repository deliberately
+  does not include lock files! This is made on purpose to use the latest version
+  of Nixpkgs with all the security fixes applied, instead of using a frozen
+  version of Nixpkgs anchored in the past which might have known
+  vulnerabilities.
+
+- The ``github:mozilla/nixpkgs-mozilla`` is this repository, each flake contains a
+  commented line in case you might want to use local path instead.
+
+- The ``?dir=flakes/nixos-22.11`` is used to refer to the non-default flake
+  which includes a specific version of Nixpkgs. This one can be changed based on
+  the content of the `flakes` directory, such as ``?dir=flakes/nixos-unstable``.
+
+- The ``#firefox-nightly`` is the package name, which is also the default in
+  this case, and can be omitted when looking at firefox-nightly. This can also
+  be replaced to use different versions such as `firefox-beta`,
+  `firefox-release` and `firefox-esr`.
+
 Rust overlay
 ------------
 
@@ -72,6 +102,7 @@ Example of using in ```shell.nix```:
 
 Flake usage
 -----------
+
 This repository contains a minimal flake interface for the various
 overlays in this repository. To use it in your own flake, add it as
 an input to your ``flake.nix``:
@@ -89,6 +120,7 @@ an input to your ``flake.nix``:
      };
    };
   }
+
 The available overlays are ``nixpkgs-mozilla.overlay`` for the
 default overlay containing everything, and
 ``nixpkgs-mozilla.{lib, rust, rr, firefox, git-cinnabar}-overlay``

firefox-overlay.nix

@@ -157,7 +157,10 @@ let
 
       requiredArgs = {
         "${nameArg}" = "firefox";
-        pname = "firefox-bin";
+        # Note: the default for binary wouldbe to include the -bin suffix,
+        # however the pname aliases the default program to be used with `nix
+        # run` command.
+        pname = "firefox";
         desktopName = version.name;
       };
 

flakes/flake.nix

@@ -0,0 +1,21 @@
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    # nixpkgs-mozilla.url = "/local/path/to/nixpkgs-mozilla";
+    nixpkgs-mozilla.url = "github:mozilla/nixpkgs-mozilla/master";
+  };
+
+  outputs = {nixpkgs, nixpkgs-mozilla, ...}:
+  let
+    latest = (import nixpkgs {
+        overlays = [ nixpkgs-mozilla.overlays.firefox ];
+        system = "x86_64-linux";
+      }).latest;
+  in {
+    packages."x86_64-linux".default = latest.firefox-nightly-bin;
+    packages."x86_64-linux".firefox-nightly = latest.firefox-nightly-bin;
+    packages."x86_64-linux".firefox-beta = latest.firefox-beta-bin;
+    packages."x86_64-linux".firefox-release = latest.firefox-release-bin;
+    packages."x86_64-linux".firefox-esr = latest.firefox-esr-bin;
+  };
+}

flakes/nixos-22.11/flake.nix

@@ -0,0 +1,12 @@
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-22.11";
+    # nixpkgs-mozilla.url = "/local/path/to/nixpkgs-mozilla/flakes";
+    nixpkgs-mozilla.url = "github:mozilla/nixpkgs-mozilla/master?dir=flakes";
+    nixpkgs-mozilla.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = {nixpkgs-mozilla, ...}: {
+    inherit (nixpkgs-mozilla) packages;
+  };
+}

flakes/nixos-unstable/flake.nix

@@ -0,0 +1,12 @@
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    # nixpkgs-mozilla.url = "/local/path/to/nixpkgs-mozilla/flakes";
+    nixpkgs-mozilla.url = "github:mozilla/nixpkgs-mozilla/master?dir=flakes";
+    nixpkgs-mozilla.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = {nixpkgs-mozilla, ...}: {
+    inherit (nixpkgs-mozilla) packages;
+  };
+}