Add plugin abi feature gates and nix dev shell

Author: ko1N

Cargo.toml

@@ -3,6 +3,7 @@ name = "memflow-native"
 version = "0.2.6"
 authors = ["Aurimas Blažulionis <0x60@pm.me>", "ko1N <ko1N1337@gmail.com>"]
 edition = "2021"
+build = "build.rs"
 description = "System call based proxy-OS for memflow"
 documentation = "https://docs.rs/memflow-native"
 readme = "README.md"
@@ -22,6 +23,9 @@ libc = { version = "0.2" }
 log = "0.4"
 memflow = { version = "0.2", features = ["plugins", "goblin"] }
 
+[build-dependencies]
+memflow = { version = "0.2", features = ["plugins"] }
+
 # we keep procfs on version 0.15.x because it does not build properly with the backtrace on 0.16.x
 # tracking issue: https://github.com/eminence/procfs/pull/309
 [target.'cfg(target_os = "linux")'.dependencies]

build.rs

@@ -0,0 +1,11 @@
+fn main() {
+    println!("cargo:rerun-if-changed=Cargo.toml");
+    println!("cargo:rerun-if-changed=Cargo.lock");
+    println!("cargo:rustc-check-cfg=cfg(memflow_plugin_api, values(\"1\", \"2\"))");
+
+    match memflow::plugins::MEMFLOW_PLUGIN_VERSION {
+        1 => println!("cargo:rustc-cfg=memflow_plugin_api=\"1\""),
+        2 => println!("cargo:rustc-cfg=memflow_plugin_api=\"2\""),
+        other => panic!("Unsupported MEMFLOW_PLUGIN_VERSION: {other}"),
+    }
+}

flake.lock

@@ -0,0 +1,39 @@
+{
+  description = "Development shell for memflow";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs =
+    {
+      self,
+      flake-utils,
+      nixpkgs,
+      rust-overlay,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        overlays = [
+          (import rust-overlay)
+        ];
+
+        pkgs = import nixpkgs {
+          inherit overlays system;
+        };
+
+        rustToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = [
+            pkgs.pkg-config
+            rustToolchain
+          ];
+        };
+      }
+    );
+}

flake.nix

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.82.0"
+components = ["clippy", "rustfmt"]