From dc017a0cab40cb2f33a01b420bb1b04038abb875 Mon Sep 17 00:00:00 2001
From: Quentin Dufour <quentin@deuxfleurs.fr>
Date: Mon, 4 Oct 2021 18:27:57 +0200
Subject: Build Garage with Nix

---
 default.nix | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 default.nix

(limited to 'default.nix')

diff --git a/default.nix b/default.nix
new file mode 100644
index 00000000..649f0133
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,75 @@
+{
+  system ? builtins.currentSystem,
+  release ? false,
+  target ? "x86_64-unknown-linux-musl",
+  compileMode ? null,
+  git_version ? null,
+}:
+
+with import ./nix/common.nix;
+
+let
+  crossSystem = { config = target; };
+in let
+
+  pkgs = import pkgsSrc {
+    inherit system crossSystem;
+    overlays = [ cargo2nixOverlay rustOverlay ];
+  };
+  rustDist = pkgs.buildPackages.rust-bin.stable.latest.default;
+
+  /*
+   The following complexity should be abstracted by makePackageSet' (note the final quote).
+   However its code uses deprecated features of rust-overlay that can lead to bug.
+   Instead, we build our own rustChannel object with the recommended API of rust-overlay.
+   */
+  rustChannel = rustDist // {
+    cargo = rustDist;
+    rustc = rustDist.override {
+      targets = [
+        (pkgs.rustBuilder.rustLib.realHostTriple pkgs.stdenv.targetPlatform)
+      ];
+    };
+  };
+
+  overrides = pkgs.buildPackages.rustBuilder.overrides.all ++ [
+    (pkgs.rustBuilder.rustLib.makeOverride {
+      name = "garage";
+      overrideAttrs = drv: if git_version != null then {
+        preConfigure = ''
+          ${drv.preConfigure or ""}
+          export GIT_VERSION="${git_version}"
+        '';
+      } else {};
+    })
+  ];
+
+  packageFun = import ./Cargo.nix;
+
+  rustPkgs = pkgs.rustBuilder.makePackageSet {
+    inherit packageFun rustChannel release;
+    packageOverrides = overrides;
+
+    buildRustPackages = pkgs.buildPackages.rustBuilder.makePackageSet {
+      inherit rustChannel packageFun;
+      packageOverrides = overrides;
+    };
+
+    localPatterns = [
+      /*
+       The way the default rules are written make think we match recursively, on full path, but the rules are misleading.
+       In fact, the regex is only called on root elements of the crate (and not recursively).
+       This behavior does not work well with our nested modules.
+       We tried to build a "deny list" but negative lookup ahead are not supported on Nix.
+       As a workaround, we have to register all our submodules in this allow list...
+       */
+       ''^(src|tests)''          # fixed default
+       ''.*\.(rs|toml)$''        # fixed default
+       ''^(crdt|replication)''   # our crate submodules
+    ];
+  };
+
+in
+  if compileMode == "test"
+    then builtins.mapAttrs (name: value: rustPkgs.workspace.${name} { inherit compileMode; }) rustPkgs.workspace
+    else rustPkgs.workspace.garage { inherit compileMode; }
-- 
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