feat: support cargo/runtime dependencies

Author: Marc Jakobi

modules/hooks.nix

@@ -22,6 +22,12 @@ in
   # PLEASE keep this sorted alphabetically.
   options.settings =
     {
+      runtimeDeps = mkOption {
+        type = types.listOf types.package;
+        description = lib.mdDoc "Runtime dependencies needed to run the checks.";
+        default = [ ];
+        example = "[ pkgs.openssl ]";
+      };
       alejandra =
         {
           check =
@@ -1039,6 +1045,12 @@ in
             description = lib.mdDoc "Path to Cargo.toml";
             default = null;
           };
+          cargoDeps = mkOption {
+            type = types.nullOr types.attrs;
+            description = lib.mdDoc "Cargo dependencies";
+            example = "pkgs.rustPlatform.importCargoLock { lockFile = ./Cargo.lock; }";
+            default = null;
+          };
         };
       statix =
         {

modules/pre-commit.nix

@@ -13,6 +13,8 @@ let
     ;
 
   inherit (pkgs) runCommand writeText git;
+  inherit (pkgs.rustPlatform) cargoSetupHook;
+  inherit (pkgs.stdenv) mkDerivation;
 
   cfg = config;
   install_stages = lib.unique (cfg.default_stages ++ (builtins.concatLists (lib.mapAttrsToList (_: h: h.stages) enabledHooks)));
@@ -197,17 +199,24 @@ let
       } >$out
     '';
 
-  run =
-    runCommand "pre-commit-run" { buildInputs = [ git ]; } ''
+  run = mkDerivation {
+    name = "pre-commit-run";
+
+    src = cfg.rootSrc;
+    buildInputs = [ git ];
+    nativeBuildInputs = config.settings.runtimeDeps
+      ++ (if config.settings.rust.cargoDeps != null
+    then [
+      cargoSetupHook
+    ]
+    else [ ]);
+    cargoDeps = config.settings.rust.cargoDeps;
+    buildPhase = ''
       set +e
       HOME=$PWD
       # Use `chmod +w` instead of `cp --no-preserve=mode` to be able to write and to
       # preserve the executable bit at the same time
-      cp -R ${cfg.rootSrc} src
-      chmod -R +w src
-      ln -fs ${configFile} src/.pre-commit-config.yaml
-      cd src
-      rm -rf .git
+      ln -fs ${configFile} .pre-commit-config.yaml
       git init
       git add .
       git config --global user.email "[email protected]"
@@ -226,6 +235,7 @@ let
       touch $out
       [ $? -eq 0 ] && exit $exitcode
     '';
+  };
 in
 {
   options =