From 3a33697aa346dfe42100bb2ba2775eaa5f54af60 Mon Sep 17 00:00:00 2001
From: Paul Kuruvilla <rohitpaulk@gmail.com>
Date: Thu, 23 Sep 2021 20:33:32 +0100
Subject: [PATCH] Syncing with codecrafters-io/languages

Created by https://github.com/codecrafters-io/languages
---
 Dockerfile | 13 ++++++++-----
 README.md  |  3 +++
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 353571d..e2da308 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM rust:1.43-buster
+FROM rust:1.54-buster
 
 # Download docker-explorer
 ARG docker_explorer_version=v18
@@ -6,14 +6,17 @@ RUN curl --fail -Lo /usr/local/bin/docker-explorer https://github.com/codecrafte
 RUN chmod +x /usr/local/bin/docker-explorer
 
 # Grab the dependencies and compile them as they dont change much
-WORKDIR /app
 COPY Cargo.toml /app/Cargo.toml
 COPY Cargo.lock /app/Cargo.lock
-RUN mkdir src && echo "fn main() {}" > "src/main.rs"
-RUN cargo build --release
+
+RUN mkdir /app/src
+RUN echo 'fn main() { println!("Hello World!"); }' > /app/src/main.rs
+
+WORKDIR /app
+RUN cargo build --release --target-dir=/tmp/codecrafters-docker-target
+RUN cargo clean -p docker-starter-rust --release --target-dir=/tmp/codecrafters-docker-target
 
 # Grab the real code
 ADD . /app
-WORKDIR /app
 
 ENTRYPOINT ["/app/your_docker.sh"]
diff --git a/README.md b/README.md
index 2bd67c3..899faa0 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,9 @@ You can then execute your program like this:
 mydocker run ubuntu:latest /usr/local/bin/docker-explorer echo hey
 ```
 
+This command compiles your Rust project, so it might be slow the first time you
+run it. Subsequent runs will be fast.
+
 # Passing the first stage
 
 CodeCrafters runs tests when you do a `git push`. Make an empty commit and push