From a3f147541fd01e506a3856b02b34c509703111da Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Mon, 28 Mar 2022 14:51:01 +0200
Subject: [PATCH] flake.*: add Nix development environment

This change adds a Nix flake capable of setting up an environment
for building Gio programs for Linux and Android, on top of the
platforms that only needs Go (Windows, WASM).

To use the flake, install Nix 2.4 or later and enable experimental
support for flakes. Then, you can launch a development shell with

$ alias nix='nix --extra-experimental-features "nix-command flakes"'
$ nix develop sourcehut:~eliasnaur/gio

The environment can also be applied to the current shell, which is
useful in combination with direnv:

$ . <(nix print-dev-env sourcehut:~eliasnaur/gio)

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 flake.lock | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 flake.nix  |  55 ++++++++++++++++++++++++++
 2 files changed, 169 insertions(+)
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..4f379398
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,114 @@
+{
+  "nodes": {
+    "android": {
+      "inputs": {
+        "devshell": "devshell",
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1648412532,
+        "narHash": "sha256-zh0rLcppJ5i2Bh8oBWjBhDvgOrMhDGdXINbp3bhrs0U=",
+        "owner": "tadfisher",
+        "repo": "android-nixpkgs",
+        "rev": "b1318b23926260685dbb09dd127f38c917fc7441",
+        "type": "github"
+      },
+      "original": {
+        "owner": "tadfisher",
+        "repo": "android-nixpkgs",
+        "type": "github"
+      }
+    },
+    "devshell": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1647857022,
+        "narHash": "sha256-Aw70NWLOIwKhT60MHDGjgWis3DP3faCzr6ap9CSayek=",
+        "owner": "numtide",
+        "repo": "devshell",
+        "rev": "0a5ff74dacb9ea22614f64e61aeb3ca0bf0e7311",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "devshell",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1642700792,
+        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1643381941,
+        "narHash": "sha256-pHTwvnN4tTsEKkWlXQ8JMY423epos8wUOhthpwJjtpc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5efc8ca954272c4376ac929f4c5ffefcc20551d5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1648469949,
+        "narHash": "sha256-ExCG9k36QNs0bNsi2NwnfL4w/kjb661rW43pf03ok/Y=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a63a39e23873d5d72753ff12bb418cb7e470790c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "android": "android",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..d1a6bfc1
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: Unlicense OR MIT
+{
+  description = "Gio build environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    android.url = "github:tadfisher/android-nixpkgs";
+    android.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, android }:
+    let
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
+    in
+    {
+      devShells = forAllSystems
+        (system:
+          let
+            pkgs = import nixpkgs {
+              inherit system;
+            };
+            android-sdk = android.sdk.${system} (sdkPkgs: with sdkPkgs;
+              [
+                build-tools-31-0-0
+                cmdline-tools-latest
+                emulator
+                platform-tools
+                platforms-android-31
+                ndk-bundle
+              ]);
+          in
+          {
+            default = with pkgs; mkShell {
+              ANDROID_SDK_ROOT = "${android-sdk}/share/android-sdk";
+              JAVA_HOME = jdk8.home;
+              packages = [
+                android-sdk
+                jdk8
+                clang
+              ] ++ (if stdenv.isLinux then [
+                vulkan-headers
+                libxkbcommon
+                wayland
+                xorg.libX11
+                xorg.libXcursor
+                xorg.libXfixes
+                libGL
+                pkgconfig
+              ] else [ ]);
+            };
+          }
+        );
+    };
+}