initial commit

.gitignore

+/target

Cargo.lock

+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "attestation-check"
+version = "0.1.0"

Cargo.toml

+[package]
+name = "attestation-check"
+version = "0.1.0"
+authors = ["Clenimar Souza <clenimar.filemon@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

Dockerfile

+FROM rust:1.49-alpine AS builder
+
+RUN USER=root cargo new --bin attestation-check
+
+WORKDIR ./attestation-check
+
+COPY ./Cargo.toml ./Cargo.toml
+
+RUN cargo build --release \
+    && rm src/*.rs
+
+COPY src ./src
+
+RUN rm ./target/release/deps/attestation_check* \
+    && cargo build --release
+
+FROM alpine
+
+COPY --from=builder /attestation-check/target/release/attestation-check /usr/local/bin/attestation-check
+
+ENTRYPOINT /usr/local/bin/attestation-check
+

src/main.rs

+use std::env;
+use std::net::TcpStream;
+
+const CAS_ENV_KEY: &str = "SCONE_CAS_ADDR";
+const LAS_ENV_KEY: &str = "SCONE_LAS_ADDR";
+
+fn main() {
+    // Read environment variables.
+    let cas = env::var(CAS_ENV_KEY).expect("ERROR: SCONE_CAS_ADDR must be set");
+    let las = env::var(LAS_ENV_KEY).expect("ERROR: SCONE_LAS_ADDR must be set");
+
+    // Try to open a connection.
+    println!("Connecting to CAS at: {}", cas);
+    TcpStream::connect(format!("{}:18765", cas)).expect("Could not connect to CAS");
+    println!("OK: CAS is reachable");
+    println!("Connecting to LAS at: {}", las);
+    TcpStream::connect(format!("{}:18766", las)).expect("Could not connect to LAS");
+    println!("OK: LAS is reachable");
+
+    // Sockets are closed here.
+}