Add repository aware caching

dockerfiles/bun-1.1.Dockerfile

@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM oven/bun:1.1.4-alpine
 
 RUN apk add --no-cache 'git>=2.40'
@@ -6,8 +7,8 @@ ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="package.json,bun.lockb"
 
 WORKDIR /app
 
-COPY package.json ./
-COPY bun.lockb ./
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 # For reproducible builds.
 # This will install the exact versions of each package specified in the lockfile.
@@ -17,3 +18,6 @@ RUN bun install --frozen-lockfile
 RUN mkdir -p /app-cached
 # If the node_modules directory exists, move it to /app-cached
 RUN if [ -d "/app/node_modules" ]; then mv /app/node_modules /app-cached; fi
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/cpp-20.Dockerfile

@@ -1,9 +1,16 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM gcc:12.2.0-bullseye
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apt-get update && \
     apt-get install --no-install-recommends -y cmake=3.18.* && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
 # TODO: Clean this up when we move to CPP23
 RUN printf "cd \${CODECRAFTERS_SUBMISSION_DIR} && cmake . && make && (echo '#!/bin/sh\nexec \${CODECRAFTERS_SUBMISSION_DIR}/server \"\$@\"' > your_git.sh) && chmod +x your_git.sh" > /codecrafters-precompile.sh
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/dotnet-8.0.Dockerfile

@@ -1,14 +1,15 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine
 
 RUN apk add --no-cache 'git>=2.40'
 
-COPY codecrafters-git.csproj /app/codecrafters-git.csproj
-COPY codecrafters-git.sln /app/codecrafters-git.sln
 
 RUN mkdir /app/src
 RUN (echo 'System.Console.WriteLine("If you are seeing this, there is something wrong with our caching mechanism! Please contact us at [email protected].");' > /app/src/Program.cs) > /dev/null
 
 WORKDIR /app
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 # This saves nuget packages to ~/.nuget
 RUN dotnet build --configuration Release .
@@ -24,3 +25,6 @@ RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && dotnet build --configuration Rel
 RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="codecrafters-git.csproj,codecrafters-git.sln"
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/go-1.13.Dockerfile

@@ -1,3 +1,9 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM golang:1.13-alpine
 
-RUN apk add --no-cache 'git>=2.43'
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+RUN apk add --no-cache 'git>=2.43'
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/go-1.16.Dockerfile

@@ -1,3 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM golang:1.16-alpine
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/go-1.19.Dockerfile

@@ -1,11 +1,16 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM golang:1.19-alpine
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="go.mod,go.sum"
 
 WORKDIR /app
 
-COPY go.mod go.sum ./
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 RUN ash -c "set -exo pipefail; go mod graph | awk '{if (\$1 !~ \"@\") {print \$2}}' | xargs -r go get"
 
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/go-1.21.Dockerfile

@@ -1,10 +1,12 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM golang:1.21-alpine
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="go.mod,go.sum"
 
 WORKDIR /app
 
-COPY go.mod go.sum ./
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 # Starting from Go 1.20, the go standard library is no loger compiled
 # setting the GODEBUG environment to "installgoroot=all" restores the old behavior
@@ -13,3 +15,6 @@ RUN GODEBUG="installgoroot=all" go install std
 RUN ash -c "set -exo pipefail; go mod graph | awk '{if (\$1 !~ \"@\") {print \$2}}' | xargs -r go get"
 
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/go-1.22.Dockerfile

@@ -1,10 +1,12 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM golang:1.22-alpine
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="go.mod,go.sum"
 
 WORKDIR /app
 
-COPY go.mod go.sum ./
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 # Starting from Go 1.20, the go standard library is no loger compiled
 # setting the GODEBUG environment to "installgoroot=all" restores the old behavior
@@ -13,3 +15,6 @@ RUN GODEBUG="installgoroot=all" go install std
 RUN ash -c "set -exo pipefail; go mod graph | awk '{if (\$1 !~ \"@\") {print \$2}}' | xargs -r go get"
 
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/haskell-9.4.Dockerfile

@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM haskell:9.4.6-buster
 
 WORKDIR /app
@@ -11,13 +12,11 @@ RUN echo "allow-different-user: true" >> /etc/stack/config.yaml
 RUN echo "install-ghc: false" >> /etc/stack/config.yaml
 RUN echo "system-ghc: true" >> /etc/stack/config.yaml
 
-COPY stack.yaml package.yaml stack.yaml.lock /app/
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 # Dummy static content to circumvent the /app doesn't exist warning
 RUN mkdir /app/src
-RUN mkdir /app/app
-RUN echo 'main :: IO ()' >> /app/app/Main.hs
-RUN echo 'main = putStrLn "Hello, World!"' >> /app/app/Main.hs
 
 RUN stack build
 RUN stack clean hs-git-clone
@@ -30,3 +29,6 @@ RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && cp -r /tmp/.stack-work . && stac
 RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="stack.yaml,package.yaml,stack.yaml.lock"
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/java-21.Dockerfile

@@ -1,8 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM maven:3.9.5-eclipse-temurin-21-alpine
 
-COPY pom.xml /app/pom.xml
 
 WORKDIR /app
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 # Download the dependencies
 RUN mvn -B package -Ddir=/tmp/codecrafters-git-target
@@ -13,4 +15,6 @@ RUN mv /app/target /app-cached # Is this needed?
 
 # Pre-compile steps
 RUN printf "cd \${CODECRAFTERS_SUBMISSION_DIR} && mvn -B package -Ddir=/tmp/codecrafters-git-target && sed -i 's/^\(mvn .*\)/#\1/' ./your_git.sh" > /codecrafters-precompile.sh
-RUN chmod +x /codecrafters-precompile.sh
+RUN chmod +x /codecrafters-precompile.sh
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/kotlin-1.3.72.Dockerfile

@@ -1,6 +1,13 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM zenika/kotlin:1.3.72-jdk11-slim
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apt-get update && \
     apt-get install --no-install-recommends -y git=1:2.* && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/kotlin-1.4.Dockerfile

@@ -1,6 +1,13 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM zenika/kotlin:1.4.20-jdk11-slim
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apt-get update && \
     apt-get install --no-install-recommends -y git=1:2.* && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/nodejs-18.Dockerfile

@@ -1 +1,7 @@
-FROM node:18.18.0-alpine3.17
+# syntax=docker/dockerfile:1.7-labs
+FROM node:18.18.0-alpine3.17
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/nodejs-21.Dockerfile

@@ -1,15 +1,19 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM node:21.7-alpine3.19
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="package.json,package-lock.json"
 
 WORKDIR /app
 
-COPY package.json ./
-COPY package-lock.json ./
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 # If dependencies in the package lock do not match those in package.json, instead of updating the package lock, npm ci will exit with an error. 
 RUN npm ci
 
 RUN mkdir -p /app-cached
 # If the node_modules directory exists, move it to /app-cached
 RUN if [ -d "/app/node_modules" ]; then mv /app/node_modules /app-cached; fi
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/python-3.11.Dockerfile

@@ -1,3 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM python:3.11-alpine
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/python-3.12.Dockerfile

@@ -1,3 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM python:3.12-alpine
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/python-3.7.Dockerfile

@@ -1,3 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM jfloff/alpine-python:3.7
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/python-3.8.Dockerfile

@@ -1,3 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM jfloff/alpine-python:3.8
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/ruby-2.7.Dockerfile

@@ -1,3 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM ruby:2.7-alpine
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/ruby-3.2.Dockerfile

@@ -1,3 +1,10 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM ruby:3.2-alpine
 
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/ruby-3.3.Dockerfile

@@ -1,11 +1,16 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM ruby:3.3-alpine
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Gemfile,Gemfile.lock"
 
 WORKDIR /app
 
-COPY Gemfile Gemfile.lock ./
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 
 RUN bundle install --verbose
 
 RUN apk add --no-cache 'git>=2.40'
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/rust-1.62.Dockerfile

@@ -1,17 +1,18 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM rust:1.62-buster
 
 RUN apt-get update && \
     apt-get install --no-install-recommends -y git=1:2.* && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
-COPY Cargo.toml /app/Cargo.toml
-COPY Cargo.lock /app/Cargo.lock
 
 RUN mkdir /app/src
 RUN echo 'fn main() { println!("Hello World!"); }' > /app/src/main.rs
 
 WORKDIR /app
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 RUN cargo build --release --target-dir=/tmp/codecrafters-git-target
 
 RUN rm /tmp/codecrafters-git-target/release/git-starter-rust
@@ -30,3 +31,6 @@ RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Cargo.toml,Cargo.lock"
 
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app

dockerfiles/rust-1.68.Dockerfile

@@ -1,17 +1,18 @@
+# syntax=docker/dockerfile:1.7-labs
 FROM rust:1.68-buster
 
 RUN apt-get update && \
     apt-get install --no-install-recommends -y git=1:2.* && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
-COPY Cargo.toml /app/Cargo.toml
-COPY Cargo.lock /app/Cargo.lock
 
 RUN mkdir /app/src
 RUN echo 'fn main() { println!("Hello World!"); }' > /app/src/main.rs
 
 WORKDIR /app
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
 RUN cargo build --release --target-dir=/tmp/codecrafters-git-target
 
 RUN rm /tmp/codecrafters-git-target/release/git-starter-rust
@@ -30,3 +31,6 @@ RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Cargo.toml,Cargo.lock"
 
+
+# Once the heave steps are done, we can copy all files back
+COPY . /app