Remove devshell

devshell.toml

@@ -1,10 +0,0 @@
-# https://numtide.github.io/devshell
-[[commands]]
-package = "devshell.cli"
-help = "Per project developer environments"
-
-[[commands]]
-package = "cargo"
-
-[[commands]]
-package = "rustc"

flake.lock

@@ -1,20 +1,5 @@
 {
   "nodes": {
-    "devshell": {
-      "locked": {
-        "lastModified": 1622013274,
-        "narHash": "sha256-mK/Lv0lCbl07dI5s7tR/7nb79HunKnJik3KyR6yeI2k=",
-        "owner": "numtide",
-        "repo": "devshell",
-        "rev": "e7faf69e6bf8546517cc936c7f6d31c7eb3abcb2",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "devshell",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "locked": {
         "lastModified": 1620759905,
@@ -46,7 +31,6 @@
     },
     "root": {
       "inputs": {
-        "devshell": "devshell",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }

flake.nix

@@ -1,20 +1,14 @@
 {
   description = "virtual environments";
 
-  inputs.devshell.url = "github:numtide/devshell";
   inputs.flake-utils.url = "github:numtide/flake-utils";
 
-  outputs = { self, flake-utils, devshell, nixpkgs }:
-    flake-utils.lib.eachDefaultSystem (system: {
-      devShell =
-        let pkgs = import nixpkgs {
-          inherit system;
-
-          overlays = [ devshell.overlay ];
+  outputs = { self, flake-utils, nixpkgs, ... }@inputs:
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [ cargo rustc pkgconfig openssl.dev ];
         };
-        in
-        pkgs.devshell.mkShell {
-          imports = [ (pkgs.devshell.importTOML ./devshell.toml) ];
-        };
-    });
+      });
 }