Rewrite in rust

Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "exec-suid"
+version = "0.1.0"
+edition = "2021"
+
+[profile.release]
+opt-level = "z"
+lto = true
+codegen-units = 1
+strip = "symbols"
+
+[dependencies]
+nix = { version = "0.29", features = ["fs", "process", "user"] }

Dockerfile

@@ -1,22 +1,17 @@
 # syntax=docker/dockerfile:1
 
-FROM alpine:latest AS builder
-
-RUN apk add --no-cache gcc musl-dev
-
-COPY exec-suid.c .
-
-ENV CC="gcc -static -O3 -s"
-RUN $CC -o /usr/bin/exec-suid exec-suid.c
+FROM rust:latest AS builder
+RUN apt-get update && apt-get install -y musl-tools && rm -rf /var/lib/apt/lists/*
+RUN rustup target add x86_64-unknown-linux-musl
+WORKDIR /usr/src/exec-suid
+COPY Cargo.toml ./
+COPY src ./src
+RUN find . && cargo build --release --target x86_64-unknown-linux-musl
 
 FROM python:latest
-
 RUN pip install pytest pyyaml
-
 RUN useradd -m hacker
-
-COPY --from=builder --chown=0:0 --chmod=6755 /usr/bin/exec-suid /usr/bin/exec-suid
-
+COPY --from=builder --chmod=6755 /usr/src/exec-suid/target/x86_64-unknown-linux-musl/release/exec-suid /usr/bin/exec-suid
 COPY tests /tests
 
 CMD ["pytest", "-v", "/tests"]