build: Static build with glibc

This is a first iteration, glibc is not a great idea for most statically
linked applciations. It should be fine for now, but we should rework
this using musl or other approaches.

.clang-format

@@ -0,0 +1,8 @@
+---
+BasedOnStyle: Google
+
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+ColumnLimit: 120
+IndentWidth: 4
+SortIncludes: false

.github/workflows/release.yml

@@ -0,0 +1,31 @@
+name: release
+
+on:
+    pull_request:
+    push:
+
+# on:
+#     push:
+#         branches:
+#         - main
+
+jobs:
+  release:
+    runs-on: ubuntu-22.04
+    permissions:
+        id-token: write
+        contents: read
+
+    steps:
+    - uses: actions/checkout@main
+    - uses: DeterminateSystems/nix-installer-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@main
+
+    - name: Build statically linked lightswitch with glibc
+      run: nix develop --command RUSTFLAGS=" C target-feature=+crt-static" cargo build --release --target x86_64-unknown-linux-gnu
+
+    - name: Upload binary
+      uses: actions/upload-artifact@main
+      with:
+        name: lightswitch
+        path: target/x86_64-unknown-linux-gnu/release/lightswitch

build.rs

@@ -11,12 +11,8 @@ const PROFILER_BPF_SOURCE: &str = "./src/bpf/profiler.bpf.c";
 const PROFILER_SKELETON: &str = "./src/bpf/profiler_skel.rs";
 
 fn main() {
-    // This is necessary but not sure why, this should be passed elsewhere
-    println!("cargo:rustc-link-lib=zstd");
-
     // Inform cargo of when to re build
     println!("cargo:rerun-if-changed={PROFILER_BPF_HEADER}");
-    println!("cargo:rerun-if-changed={PROFILER_BPF_HEADER}");
     println!("cargo:rerun-if-changed={PROFILER_BPF_SOURCE}");
 
     let bindings = bindgen::Builder::default()

flake.nix

@@ -18,7 +18,9 @@
           pkgs = import nixpkgs {
             inherit system overlays;
           };
-          zstd-static = (pkgs.zstd.override { static = true; });
+          elfutils-without-zstd = pkgs.elfutils.overrideAttrs (attrs: {
+            configureFlags = attrs.configureFlags ++ [ "--without-zstd" ];
+          });
         in
         with pkgs;
         {
@@ -42,18 +44,17 @@
               # Native deps
               glibc
               glibc.static
-              elfutils
+              elfutils-without-zstd
               zlib.static
               zlib.dev
               openssl
-              zstd-static
               # Other tools
               cargo-edit
               # ocamlPackages.magic-trace
             ];
 
             LIBCLANG_PATH = lib.makeLibraryPath [ llvmPackages_16.libclang ];
-            LD_LIBRARY_PATH = lib.makeLibraryPath [ zstd-static zlib.static elfutils ];
+            LD_LIBRARY_PATH = lib.makeLibraryPath [ zlib.static elfutils-without-zstd ];
           };
         }
       );