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Docker内のcargoコマンド実行で 「could not find Cargo.toml」が発生した時の対応

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問題点

Dockerイメージのビルドの中で、pngquantをインストールしようとして carge build --release をすると、

error: could not find `Cargo.toml` in `/var/task` or any parent directory

が発生する。
手順通り

RUN git clone --recursive https://github.com/kornelski/pngquant.git ${LAMBDA_TASK_ROOT}/pngquant
RUN cd ${LAMBDA_TASK_ROOT}/pngquant
RUN cargo build --release

としても。

解決策

Dockerfile 内だと cd コマンドが効かないので

RUN git clone --recursive https://github.com/kornelski/pngquant.git ${LAMBDA_TASK_ROOT}/pngquant
WORKDIR ${LAMBDA_TASK_ROOT}/pngquant
RUN cargo build --release

とする必要がある。

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