chore(docker): migrate to rust-chef #57
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## Walkthrough
A `.dockerignore` file was added to exclude unnecessary files from Docker build contexts. The Dockerfile was refactored to use a multi-stage build with `cargo-chef` for efficient Rust dependency caching and build optimization, resulting in a smaller final image and improved build performance.
## Changes
| File(s) | Change Summary |
|-----------------------|-----------------------------------------------------------------------------------------------|
| .dockerignore | New file added to exclude build outputs, VCS data, logs, configs, and IDE files from context. |
| Dockerfile | Refactored to multi-stage build using `cargo-chef` for dependency caching and optimization; added management port and improved image cleanliness. |
## Sequence Diagram(s)
```mermaid
sequenceDiagram
participant Dev as Developer
participant Docker as Docker Daemon
participant Chef as Cargo Chef (Build Stages)
participant App as Rust Application
Dev->>Docker: docker build .
Docker->>Chef: chef stage (prepare cargo-chef)
Chef->>Chef: planner stage (cargo chef prepare)
Chef->>Chef: builder stage (install deps, cargo chef cook, cargo build)
Chef->>App: produce optimized binary
Docker->>App: copy binary to runtime image
App->>Dev: optimized container readyPoem
|
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Actionable comments posted: 1
🔭 Outside diff range comments (1)
Dockerfile (1)
19-24: Harden the runtime image: single WORKDIR + non-root userTwo WORKDIR switches leave the final container at
/etc, which is unexpected. Running as root also increases risk.-WORKDIR /app -COPY --from=builder /app/target/release/hub /usr/local/bin -WORKDIR /etc +WORKDIR /app +COPY --from=builder /app/target/release/hub /usr/local/bin +# Create an unprivileged user and switch to it +RUN useradd -m -u 1001 appuser && chown appuser:appuser /usr/local/bin/hub +USER 1001
🧹 Nitpick comments (3)
.dockerignore (1)
1-10: Remove self-references to avoid confusionListing
Dockerfileand.dockerignoreinside the ignore file is harmless (the CLI still sends both files), but it can mislead future contributors and break 3rd-party tooling that expects them in the context. Unless you have a very specific reason, drop those two lines.-README.md -Dockerfile -.dockerignore +README.mdDockerfile (2)
9-11: Shrink builder layer by installing build deps with--no-install-recommendsThe default
apt-get install -ydrags in extra packages (man pages, locales, etc.). Adding--no-install-recommendskeeps the image smaller and the cache tighter.-RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/* +RUN apt-get update && apt-get install -y --no-install-recommends pkg-config libssl-dev \ + && rm -rf /var/lib/apt/lists/*
20-21: Trim runtime depsYou rarely need the full
opensslCLI at runtime—libssl3(orlibssl-dev’s runtime counterpart) plusca-certificatesis sufficient and ~20 MB lighter.-RUN apt-get update && apt-get install -y openssl ca-certificates && rm -rf /var/lib/apt/lists/* +RUN apt-get update && apt-get install -y --no-install-recommends libssl3 ca-certificates \ + && rm -rf /var/lib/apt/lists/*
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📒 Files selected for processing (2)
.dockerignore(1 hunks)Dockerfile(1 hunks)
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- GitHub Check: build
Comment on lines
+14
to
17
| # Build application | ||
| COPY . . | ||
| RUN cargo build --release --bin hub | ||
|
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🛠️ Refactor suggestion
Make builds reproducible by pinning Cargo.lock
cargo build without --locked will silently update dependencies if Cargo.lock is out of sync, defeating deterministic builds and caching advantages.
-RUN cargo build --release --bin hub
+RUN cargo build --release --locked --bin hub📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
Suggested change
| # Build application | |
| COPY . . | |
| RUN cargo build --release --bin hub | |
| # Build application | |
| COPY . . | |
| RUN cargo build --release --locked --bin hub |
🤖 Prompt for AI Agents
In Dockerfile lines 14 to 17, the cargo build command should be updated to use
the --locked flag to ensure reproducible builds. Modify the RUN command to run
cargo build --release --bin hub --locked so that it respects the Cargo.lock file
and prevents silent dependency updates during the build.
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Important
Looks good to me! 👍
Reviewed everything up to 0f88ee5 in 1 minute and 41 seconds. Click for details.
- Reviewed
56lines of code in2files - Skipped
0files when reviewing. - Skipped posting
3draft comments. View those below. - Modify your settings and rules to customize what types of comments Ellipsis leaves. And don't forget to react with 👍 or 👎 to teach Ellipsis.
1. .dockerignore:10
- Draft comment:
Add a newline at EOF for POSIX compliance. - Reason this comment was not posted:
Comment did not seem useful. Confidence is useful =0%<= threshold50%This comment is purely informative and does not provide a specific code suggestion or ask for a specific test. It simply states a general coding practice without addressing a specific issue in the code.
2. Dockerfile:23
- Draft comment:
Verify if setting WORKDIR to /etc is intentional; consider using /app if not required. - Reason this comment was not posted:
Comment was on unchanged code.
3. Dockerfile:5
- Draft comment:
Consider copying only dependency-relevant files in the planner stage to optimize caching. - Reason this comment was not posted:
Confidence changes required:50%<= threshold50%None
Workflow ID: wflow_jP9RXPgxY7vY6jkt
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Summary by CodeRabbit
.dockerignorefile to exclude unnecessary files and directories from Docker build context.Important
Optimize Docker build with
cargo-cheffor better caching and smaller image size, and add.dockerignoreto exclude unnecessary files.Dockerfileto usecargo-cheffor a multi-stage build, improving dependency caching and reducing image size.plannerandbuilderstages for preparing and cooking dependencies.runtimestage to minimize the final image.MANAGEMENT_PORT=8080toDockerfileand exposed port 8080..dockerignoreto excludetarget/,.git/,.gitignore,README.md,Dockerfile,.dockerignore,*.log,.env,.vscode/, and.idea/.This description was created by
for 0f88ee5. You can customize this summary. It will automatically update as commits are pushed.