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Use git clone for Flutter SDK to support arm64
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Browse Source 
Switch from downloading pre-built Flutter SDK tarballs to cloning from
git. Flutter only provides x64 Linux tarballs, but cloning from git
allows Flutter to bootstrap itself with the correct Dart SDK for any
host architecture (amd64 or arm64).

Also reduces image size from ~4GB to ~1.7GB for Android variant.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Mathias Beaulieu-Duncan 2026-02-03 02:06:52 -05:00
parent 84b6f55c7a
commit b2e4c09c2b
3 changed files with 12 additions and 37 deletions
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17
Dockerfile
View File

@ -8,21 +8,12 @@ LABEL org.opencontainers.image.version="${FLUTTER_VERSION}"
USER 0
# Download Flutter SDK and strip unnecessary files in a single layer
RUN curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_${FLUTTER_VERSION}-stable.tar.xz" \
-o /tmp/flutter.tar.xz && \
tar xf /tmp/flutter.tar.xz -C /opt && \
rm /tmp/flutter.tar.xz && \
rm -rf /opt/flutter/dev \
/opt/flutter/examples \
/opt/flutter/bin/cache/artifacts/engine/android-* \
/opt/flutter/bin/cache/artifacts/engine/linux-* && \
# Clone Flutter SDK from git (supports both amd64 and arm64)
RUN git clone --depth 1 --branch ${FLUTTER_VERSION} https://github.com/flutter/flutter.git /opt/flutter && \
git config --global --add safe.directory /opt/flutter && \
rm -rf /opt/flutter/dev /opt/flutter/examples && \
chown -R 65532:65532 /opt/flutter
# Mark git directory as safe and compact git history
RUN git config --global --add safe.directory /opt/flutter && \
cd /opt/flutter && git gc --prune=all
USER 65532
# Configure for web-only (disable everything else)

16
Dockerfile.android
View File

@ -30,18 +30,10 @@ RUN mkdir -p "${ANDROID_HOME}/cmdline-tools" && \
# Remove lint-psi to eliminate protobuf-java 2.6.1 CVEs (saves 86MB)
rm -rf "${ANDROID_HOME}/cmdline-tools/latest/lib/external/lint-psi"
# Download Flutter SDK and strip unnecessary files
RUN curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_${FLUTTER_VERSION}-stable.tar.xz" \
-o /tmp/flutter.tar.xz && \
tar xf /tmp/flutter.tar.xz -C /opt && \
rm /tmp/flutter.tar.xz && \
rm -rf /opt/flutter/dev \
/opt/flutter/examples \
/opt/flutter/bin/cache/artifacts/engine/linux-* \
/opt/flutter/bin/cache/flutter_web_sdk
RUN git config --global --add safe.directory /opt/flutter && \
cd /opt/flutter && git gc --prune=all
# Clone Flutter SDK from git (supports both amd64 and arm64)
RUN git clone --depth 1 --branch ${FLUTTER_VERSION} https://github.com/flutter/flutter.git /opt/flutter && \
git config --global --add safe.directory /opt/flutter && \
rm -rf /opt/flutter/dev /opt/flutter/examples
# Fix ownership before switching to flutter user
RUN chown -R 65532:65532 /opt/flutter "${ANDROID_HOME}"

16
Dockerfile.linux
View File

@ -8,18 +8,10 @@ LABEL org.opencontainers.image.version="${FLUTTER_VERSION}"
USER 0
# Download Flutter SDK and strip unnecessary files
RUN curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_${FLUTTER_VERSION}-stable.tar.xz" \
-o /tmp/flutter.tar.xz && \
tar xf /tmp/flutter.tar.xz -C /opt && \
rm /tmp/flutter.tar.xz && \
rm -rf /opt/flutter/dev \
/opt/flutter/examples \
/opt/flutter/bin/cache/artifacts/engine/android-* \
/opt/flutter/bin/cache/flutter_web_sdk
RUN git config --global --add safe.directory /opt/flutter && \
cd /opt/flutter && git gc --prune=all
# Clone Flutter SDK from git (supports both amd64 and arm64)
RUN git clone --depth 1 --branch ${FLUTTER_VERSION} https://github.com/flutter/flutter.git /opt/flutter && \
git config --global --add safe.directory /opt/flutter && \
rm -rf /opt/flutter/dev /opt/flutter/examples
# Fix ownership before switching to flutter user
RUN chown -R 65532:65532 /opt/flutter