rathole: get rid of vergen

Fixes build on darwin. Drops legacy darwin SDK pattern (which is a no-op).

pkgs/by-name/ra/rathole/0001-no-more-vergen.patch

@@ -0,0 +1,22 @@
+diff --git a/Cargo.toml b/Cargo.toml
+index e7a944e..e6bae43 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -7,7 +7,6 @@ description = "A reverse proxy for NAT traversal"
+ license = "Apache-2.0"
+ repository = "https://github.com/rapiz1/rathole"
+ readme = "README.md"
+-build = "build.rs"
+ include = ["src/**/*", "LICENSE", "README.md", "build.rs"]
+ 
+ [features]
+@@ -130,9 +129,4 @@ p12 = { version = "0.6.3", optional = true }
+ openssl = { version = "0.10", features = ["vendored"], optional = true }
+ 
+ [build-dependencies]
+-vergen = { version = "7.4.2", default-features = false, features = [
+-    "build",
+-    "git",
+-    "cargo",
+-] }
+ anyhow = "1.0"

pkgs/by-name/ra/rathole/package.nix

@@ -3,13 +3,13 @@
   stdenv,
   fetchFromGitHub,
   rustPlatform,
+  rustc,
   pkg-config,
   openssl,
   nixosTests,
-  darwin,
 }:
 
-rustPlatform.buildRustPackage {
+rustPlatform.buildRustPackage rec {
   pname = "rathole";
   version = "0.5.0-unstable-2024-06-06";
 
@@ -20,16 +20,27 @@ rustPlatform.buildRustPackage {
     hash = "sha256-C0/G4JOZ4pTAvcKZhRHsGvlLlwAyWBQ0rMScLvaLSuA=";
   };
 
+  # Get rid of git dependency on vergen. No reason to require libgit2-sys as
+  # well as libz-sys. Vendored c libraries for libgit2/zlib fail to build on
+  # darwin and using libs from nixpkgs seems excessive.
+  patches = [
+    ./0001-no-more-vergen.patch
+  ];
+
+  # Build script is only needed for vergen and does nothing when not in a git
+  # repo.
+  postPatch = ''
+    rm build.rs
+  '';
+
   useFetchCargoVendor = true;
   cargoHash = "sha256-IgPDe8kuWzJ6nF2DceUbN7fw0eGkoYhu1IGMdlSMFos=";
 
   nativeBuildInputs = [ pkg-config ];
 
-  buildInputs =
-    [
-      openssl
-    ]
-    ++ lib.optionals stdenv.hostPlatform.isDarwin (with darwin.apple_sdk.frameworks; [ CoreServices ]);
+  buildInputs = [
+    openssl
+  ];
 
   __darwinAllowLocalNetworking = true;
 
@@ -39,6 +50,18 @@ rustPlatform.buildRustPackage {
     (cd examples/tls && chmod +x create_self_signed_cert.sh && ./create_self_signed_cert.sh)
   '';
 
+  env = {
+    VERGEN_BUILD_TIMESTAMP = "0";
+    VERGEN_BUILD_SEMVER = version;
+    VERGEN_GIT_COMMIT_TIMESTAMP = "0";
+    VERGEN_GIT_BRANCH = "main";
+    VERGEN_RUSTC_SEMVER = rustc.version;
+    VERGEN_RUSTC_CHANNEL = "stable";
+    VERGEN_CARGO_PROFILE = "release";
+    VERGEN_CARGO_FEATURES = "";
+    VERGEN_CARGO_TARGET_TRIPLE = "${stdenv.hostPlatform.rust.rustcTarget}";
+  };
+
   passthru.tests = {
     inherit (nixosTests) rathole;
   };