From 584a7b12127fdfe3b62def663c73846ae09599bc Mon Sep 17 00:00:00 2001
From: Eric Seidel <eric@shorebird.dev>
Date: Fri, 12 Dec 2025 11:54:41 -0800
Subject: [PATCH 1/2] chore: move build_engine scripts into this repo

---
 shorebird/ci/internal/generate_manifest.sh |  93 ++++++++++
 shorebird/ci/internal/linux_build.sh       | 105 +++++++++++
 shorebird/ci/internal/linux_setup.sh       |  30 +++
 shorebird/ci/internal/linux_test_build.sh  |  29 +++
 shorebird/ci/internal/linux_upload.sh      | 136 ++++++++++++++
 shorebird/ci/internal/mac_build.sh         | 204 +++++++++++++++++++++
 shorebird/ci/internal/mac_setup.sh         |  11 ++
 shorebird/ci/internal/mac_upload.sh        | 178 ++++++++++++++++++
 shorebird/ci/internal/win_build.sh         |  63 +++++++
 shorebird/ci/internal/win_setup.sh         |   8 +
 shorebird/ci/internal/win_upload.sh        |  88 +++++++++
 shorebird/ci/linux_build_and_upload.sh     |  32 ++++
 shorebird/ci/mac_build_and_upload.sh       |  32 ++++
 shorebird/ci/win_build_and_upload.sh       |  32 ++++
 14 files changed, 1041 insertions(+)
 create mode 100755 shorebird/ci/internal/generate_manifest.sh
 create mode 100755 shorebird/ci/internal/linux_build.sh
 create mode 100755 shorebird/ci/internal/linux_setup.sh
 create mode 100755 shorebird/ci/internal/linux_test_build.sh
 create mode 100755 shorebird/ci/internal/linux_upload.sh
 create mode 100755 shorebird/ci/internal/mac_build.sh
 create mode 100755 shorebird/ci/internal/mac_setup.sh
 create mode 100755 shorebird/ci/internal/mac_upload.sh
 create mode 100755 shorebird/ci/internal/win_build.sh
 create mode 100755 shorebird/ci/internal/win_setup.sh
 create mode 100755 shorebird/ci/internal/win_upload.sh
 create mode 100755 shorebird/ci/linux_build_and_upload.sh
 create mode 100755 shorebird/ci/mac_build_and_upload.sh
 create mode 100755 shorebird/ci/win_build_and_upload.sh

diff --git a/shorebird/ci/internal/generate_manifest.sh b/shorebird/ci/internal/generate_manifest.sh
new file mode 100755
index 0000000000000..4c95de6baf098
--- /dev/null
+++ b/shorebird/ci/internal/generate_manifest.sh
@@ -0,0 +1,93 @@
+#!/bin/bash
+
+# This script outputs an artifact_manifest.yaml mapping
+# a shorebird engine revision to a flutter engine revision.
+# Usage:
+#  ./generate_manifest.sh <flutter_engine_revision> > artifact_manifest.yaml
+
+set -e
+
+# NOTE: If you edit this file you also may need to edit the global list
+# of all known artifacts in the artifact_proxy's config.dart
+
+if [ "$#" -ne 1 ]; then
+  echo "Usage: ./generate_manifest.sh <flutter_engine_revision>"
+  exit 1
+fi
+
+FLUTTER_ENGINE_REVISION=$1
+
+cat <<EOF
+# This file is generated by shorebird/packages/artifact_proxy/tool/generate_manifest.sh
+# Do not edit this file manually.
+
+flutter_engine_revision: $FLUTTER_ENGINE_REVISION
+storage_bucket: download.shorebird.dev
+artifact_overrides:
+  # Android release artifacts
+  # artifacts.zip includes flutter.jar, libflutter.so, etc.
+  # symbols.zip includes symbols for libflutter.so
+  # darwin-x64.zip gen_snapshot for darwin-x64
+  # windows-x64.zip gen_snapshot for windows-x64
+  # linux-x64.zip gen_snapshot for linux-x64
+  - flutter_infra_release/flutter/\$engine/android-arm64-release/artifacts.zip
+  - flutter_infra_release/flutter/\$engine/android-arm64-release/darwin-x64.zip
+  - flutter_infra_release/flutter/\$engine/android-arm64-release/linux-x64.zip
+  - flutter_infra_release/flutter/\$engine/android-arm64-release/symbols.zip
+  - flutter_infra_release/flutter/\$engine/android-arm64-release/windows-x64.zip
+
+  - flutter_infra_release/flutter/\$engine/android-arm-release/artifacts.zip
+  - flutter_infra_release/flutter/\$engine/android-arm-release/darwin-x64.zip
+  - flutter_infra_release/flutter/\$engine/android-arm-release/linux-x64.zip
+  - flutter_infra_release/flutter/\$engine/android-arm-release/symbols.zip
+  - flutter_infra_release/flutter/\$engine/android-arm-release/windows-x64.zip
+
+  - flutter_infra_release/flutter/\$engine/android-x64-release/artifacts.zip
+  - flutter_infra_release/flutter/\$engine/android-x64-release/darwin-x64.zip
+  - flutter_infra_release/flutter/\$engine/android-x64-release/linux-x64.zip
+  - flutter_infra_release/flutter/\$engine/android-x64-release/symbols.zip
+  - flutter_infra_release/flutter/\$engine/android-x64-release/windows-x64.zip
+
+  # engine_stamp.json
+  - flutter_infra_release/flutter/\$engine/engine_stamp.json
+
+  # Dart SDK
+  - flutter_infra_release/flutter/\$engine/dart-sdk-darwin-arm64.zip
+  - flutter_infra_release/flutter/\$engine/dart-sdk-darwin-x64.zip
+  - flutter_infra_release/flutter/\$engine/dart-sdk-linux-x64.zip
+  - flutter_infra_release/flutter/\$engine/dart-sdk-windows-x64.zip
+
+  # embedding release
+  - download.flutter.io/io/flutter/flutter_embedding_release/1.0.0-\$engine/flutter_embedding_release-1.0.0-\$engine.pom
+  - download.flutter.io/io/flutter/flutter_embedding_release/1.0.0-\$engine/flutter_embedding_release-1.0.0-\$engine.jar
+  # arm64_v8a release
+  - download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-\$engine/arm64_v8a_release-1.0.0-\$engine.pom
+  - download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-\$engine/arm64_v8a_release-1.0.0-\$engine.jar
+  # armeabi_v7a release
+  - download.flutter.io/io/flutter/armeabi_v7a_release/1.0.0-\$engine/armeabi_v7a_release-1.0.0-\$engine.pom
+  - download.flutter.io/io/flutter/armeabi_v7a_release/1.0.0-\$engine/armeabi_v7a_release-1.0.0-\$engine.jar
+  # x86_64 release
+  - download.flutter.io/io/flutter/x86_64_release/1.0.0-\$engine/x86_64_release-1.0.0-\$engine.pom
+  - download.flutter.io/io/flutter/x86_64_release/1.0.0-\$engine/x86_64_release-1.0.0-\$engine.jar
+
+  # Common release artifacts
+  - flutter_infra_release/flutter/\$engine/flutter_patched_sdk_product.zip
+
+  # iOS release artifacts
+  # Includes unified Flutter.framework for device and simulator (debug)
+  - flutter_infra_release/flutter/\$engine/ios-release/artifacts.zip
+  - flutter_infra_release/flutter/\$engine/ios-release/Flutter.dSYM.zip
+
+  # Linux release artifacts
+  - flutter_infra_release/flutter/\$engine/linux-x64/artifacts.zip
+  - flutter_infra_release/flutter/\$engine/linux-x64-release/linux-x64-flutter-gtk.zip
+
+  # macOS release artifacts
+  - flutter_infra_release/flutter/\$engine/darwin-x64-release/artifacts.zip
+  - flutter_infra_release/flutter/\$engine/darwin-x64-release/framework.zip
+  - flutter_infra_release/flutter/\$engine/darwin-x64-release/gen_snapshot.zip
+
+  # Windows release artifacts
+  - flutter_infra_release/flutter/\$engine/windows-x64/artifacts.zip
+  - flutter_infra_release/flutter/\$engine/windows-x64-release/windows-x64-flutter.zip
+EOF
diff --git a/shorebird/ci/internal/linux_build.sh b/shorebird/ci/internal/linux_build.sh
new file mode 100755
index 0000000000000..06d995f2fc5d2
--- /dev/null
+++ b/shorebird/ci/internal/linux_build.sh
@@ -0,0 +1,105 @@
+#!/bin/bash -e
+
+# Usage:
+# ./linux_build.sh engine_path
+
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 engine_path"
+    exit 1
+fi
+
+# Convert to an absolute path so we don't need to worry about cd'ing back to
+# the root directory between commands.
+ENGINE_ROOT=$(realpath $1)
+
+ENGINE_SRC=$ENGINE_ROOT/src
+ENGINE_OUT=$ENGINE_SRC/out
+UPDATER_SRC=$ENGINE_SRC/flutter/third_party/updater
+HOST_ARCH='linux-x64'
+
+# Build the Rust library.
+cd $UPDATER_SRC/library
+
+# 24 is Flutter's current minimum supported version,
+# see https://docs.flutter.dev/reference/supported-platforms
+# previous iterations of cargo-ndk required the version to be passed as
+# -p <version>, but that no longer seems needed.
+# We always use the hermetic NDK from the engine repo.
+ANDROID_NDK_HOME="$ENGINE_SRC/flutter/third_party/android_tools/ndk" \
+cargo ndk \
+    --target armv7-linux-androideabi \
+    --target aarch64-linux-android \
+    --target i686-linux-android \
+    --target x86_64-linux-android \
+    build --release
+
+cargo build --release --target x86_64-unknown-linux-gnu
+
+# Build the patch tool.
+cd $UPDATER_SRC/patch
+cargo build --release
+
+# Compile the engine using the steps here:
+# https://github.com/flutter/flutter/wiki/Compiling-the-engine#compiling-for-android-from-macos-or-linux
+cd $ENGINE_SRC
+
+NINJA="ninja"
+GN=./flutter/tools/gn
+# We could probably use our own prebuilt dart SDK, by modifying the gn files.
+GN_ARGS="--no-rbe --no-enable-unittests"
+
+# We could use Linux to generate all of our Android binaries, but we don't yet.
+# https://github.com/flutter/engine/blob/e590b24f3962fda3ec9144dcee3f7565b195839a/ci/builders/linux_android_aot_engine.json#L40
+
+# Build the default and gen_snapshot targets.
+#
+# Linux doesn't seem to use "archive_gen_snapshot" as a target name yet.
+# https://github.com/flutter/flutter/issues/105351#issuecomment-1650686247
+ANDROID_TARGETS="default gen_snapshot"
+
+# Android arm64 release
+$GN $GN_ARGS --android --android-cpu=arm64 --runtime-mode=release
+$NINJA -C ./out/android_release_arm64 $ANDROID_TARGETS
+
+# Android arm32 release
+$GN $GN_ARGS --runtime-mode=release --android
+$NINJA -C out/android_release $ANDROID_TARGETS
+
+# Android x64 release
+$GN $GN_ARGS --android --android-cpu=x64 --runtime-mode=release
+$NINJA -C ./out/android_release_x64 $ANDROID_TARGETS
+
+# Build Dart and Flutter
+$GN $GN_ARGS --runtime-mode=release --no-prebuilt-dart-sdk
+# build Dart and the linux shell and flutter_patched_sdk_product.zip
+$NINJA -C out/host_release dart_sdk flutter/shell/platform/linux:flutter_gtk flutter/build/archives:flutter_patched_sdk
+# We want to build flutter/tools/font_subset, but that doesn't work with
+# --no-prebuilt-dart-sdk.
+# https://github.com/flutter/flutter/issues/164531
+
+# Build debug Linux artifacts
+# These are output to the `linux-x64` directory in host_debug, and are used
+# by `flutter build linux --release`.
+$GN $GN_ARGS --no-prebuilt-dart-sdk
+$NINJA -C ./out/host_debug flutter/build/archives:artifacts
+
+# Shorebird AOT Tools (Linker)
+mkdir -p $ENGINE_OUT/host_release/aot_tools
+
+# Dart kernel (.dill) files are not stable and can change with the version of Dart, so we
+# can't use this machine's `dart`.  Here we're using the version of Dart that this
+# version of the engine depends on, which should be the same version that
+# `flutter` ends up depending on.
+DART=$ENGINE_OUT/host_release/dart-sdk/bin/dart
+AOT_TOOLS_PKG=$ENGINE_SRC/flutter/third_party/dart/pkg/aot_tools
+# This should be part of `gclient sync` https://github.com/shorebirdtech/_build_engine/issues/113
+(cd $AOT_TOOLS_PKG; $DART pub get)
+# This should be built as part of Dart and then pulled down as part of the engine build.
+# https://github.com/shorebirdtech/_build_engine/issues/88
+$DART compile kernel $AOT_TOOLS_PKG/bin/aot_tools.dart -o $ENGINE_OUT/host_release/aot_tools/aot-tools.dill
+
+mkdir -p $ENGINE_OUT/host_release/updater_tools
+UPDATER_TOOLS_PKG=$ENGINE_SRC/flutter/third_party/updater/updater_tools
+# This should be part of `gclient sync` https://github.com/shorebirdtech/_build_engine/issues/113
+
+# We could also build the `patch` tool for Linux here.
diff --git a/shorebird/ci/internal/linux_setup.sh b/shorebird/ci/internal/linux_setup.sh
new file mode 100755
index 0000000000000..626ad211536eb
--- /dev/null
+++ b/shorebird/ci/internal/linux_setup.sh
@@ -0,0 +1,30 @@
+#!/bin/bash -e
+
+# Usage:
+# ./linux_setup.sh
+
+# Per https://github.com/flutter/flutter/wiki/Setting-up-the-Engine-development-environment
+# Subset of ./flutter/build/install-build-deps-linux-desktop.sh
+sudo apt -y install libfreetype6-dev pkg-config
+
+# This assumes rust is installed, but could also install rust/cargo.
+
+# Need NDK from https://developer.android.com/ndk/downloads
+# The NDK version should match that of DEPS, e.g.
+# https://github.com/flutter/flutter/blame/b45fa18946ecc2d9b4009952c636ba7e2ffbb787/DEPS#L615
+# Example:
+# curl -O https://dl.google.com/android/repository/android-ndk-r27d-linux.zip
+# unzip android-ndk-r27d-linux.zip
+# On the GHA runners we set this in .github/workflows/build_engine.yaml
+# env:
+#   NDK_HOME: /home/gha/bin/android-ndk-r27d
+
+# We require an old version of cargo-ndk to support the old NDK Flutter
+# engine currently uses.
+cargo install cargo-ndk
+rustup target add \
+   aarch64-linux-android \
+   armv7-linux-androideabi \
+   x86_64-linux-android \
+   i686-linux-android \
+   x86_64-unknown-linux-gnu
diff --git a/shorebird/ci/internal/linux_test_build.sh b/shorebird/ci/internal/linux_test_build.sh
new file mode 100755
index 0000000000000..be3c54da547ec
--- /dev/null
+++ b/shorebird/ci/internal/linux_test_build.sh
@@ -0,0 +1,29 @@
+#!/bin/bash -e
+
+# The path to the Flutter engine.
+# Convert to an absolute path so we don't need to worry about cd'ing back to
+# the root directory between commands.
+ENGINE_ROOT=$(realpath $1)
+ENGINE_SRC=$ENGINE_ROOT/src
+
+cd $ENGINE_SRC
+
+UPDATER_SRC=$ENGINE_SRC/flutter/third_party/updater
+(cd $UPDATER_SRC &&
+  ANDROID_NDK_HOME="$ENGINE_SRC/flutter/third_party/android_tools/ndk" \
+    cargo ndk \
+    --target armv7-linux-androideabi \
+    --target aarch64-linux-android \
+    --target i686-linux-android \
+    --target x86_64-linux-android \
+    build --release &&
+  cargo build --release --target x86_64-unknown-linux-gnu
+)
+
+# Generate an unoptimized debug build of the engine (expected by the test script).
+./flutter/tools/gn --unoptimized --no-rbe
+ninja -C out/host_debug_unopt
+
+# Generate an unoptimized android debug build for java engine tests
+./flutter/tools/gn --android --unoptimized --no-rbe
+ninja -C out/android_debug_unopt
diff --git a/shorebird/ci/internal/linux_upload.sh b/shorebird/ci/internal/linux_upload.sh
new file mode 100755
index 0000000000000..a374cc29d9781
--- /dev/null
+++ b/shorebird/ci/internal/linux_upload.sh
@@ -0,0 +1,136 @@
+#!/bin/bash -e
+
+# Usage:
+# ./linux_upload.sh engine_path git_hash
+
+# Convert to an absolute path so we don't need to worry about cd'ing back to
+# the root directory between commands.
+ENGINE_ROOT=$(realpath $1)
+ENGINE_HASH=$2
+
+STORAGE_BUCKET="download.shorebird.dev"
+SHOREBIRD_ROOT=gs://$STORAGE_BUCKET/shorebird/$ENGINE_HASH
+
+ENGINE_SRC=$ENGINE_ROOT/src
+ENGINE_OUT=$ENGINE_SRC/out
+ENGINE_FLUTTER=$ENGINE_SRC/flutter
+
+cd $ENGINE_FLUTTER
+
+# Compute the content-aware hash for the Dart SDK.
+# This allows Flutter checkouts that haven't changed engine content to share
+# the same pre-built Dart SDK, even if they have different git commit SHAs.
+CONTENT_HASH=$($ENGINE_FLUTTER/bin/internal/content_aware_hash.sh)
+
+# We do not generate a manifest file, we assume another builder did that.
+# TODO(bryanoltman): should we generate a manifest file as part of an upload
+#   script, or should it be done once all build and uploads have completed?
+#   See https://github.com/shorebirdtech/build_engine/issues/25
+
+# TODO(eseidel): This should not be in shell, it's too complicated/repetitive.
+
+HOST_ARCH='linux-x64'
+
+INFRA_ROOT="gs://$STORAGE_BUCKET/flutter_infra_release/flutter/$ENGINE_HASH"
+MAVEN_VER="1.0.0-$ENGINE_HASH"
+MAVEN_ROOT="gs://$STORAGE_BUCKET/download.flutter.io/io/flutter"
+
+# Dart SDK
+# This gets uploaded to flutter_infra_release/flutter/\$engine/dart-sdk-$HOST_ARCH.zip
+# We also upload to the content-aware hash path to support local development branches.
+CONTENT_INFRA_ROOT="gs://$STORAGE_BUCKET/flutter_infra_release/flutter/$CONTENT_HASH"
+
+HOST_RELEASE=$ENGINE_OUT/host_release
+DART_ZIP_FILE=dart-sdk-$HOST_ARCH.zip
+(
+    cd $HOST_RELEASE;
+    zip -r $DART_ZIP_FILE dart-sdk
+)
+ZIPS_DEST=$INFRA_ROOT/$DART_ZIP_FILE
+gsutil cp $HOST_RELEASE/$DART_ZIP_FILE $ZIPS_DEST
+# Also upload to content-aware hash path
+gsutil cp $HOST_RELEASE/$DART_ZIP_FILE $CONTENT_INFRA_ROOT/$DART_ZIP_FILE
+
+# Android Arm64 release Flutter artifacts
+ARCH_OUT=$ENGINE_OUT/android_release_arm64
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-arm64-release
+ZIPS_DEST=$INFRA_ROOT/android-arm64-release
+gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+gsutil cp $ZIPS_OUT/symbols.zip $ZIPS_DEST/symbols.zip
+# Android Arm64 release Maven artifacts
+ARCH_PATH=$ARCH_OUT/arm64_v8a_release
+MAVEN_PATH=$MAVEN_ROOT/arm64_v8a_release/$MAVEN_VER/arm64_v8a_release-$MAVEN_VER
+gsutil cp $ARCH_PATH.pom $MAVEN_PATH.pom
+gsutil cp $ARCH_PATH.jar $MAVEN_PATH.jar
+gsutil cp $ARCH_PATH.maven-metadata.xml $MAVEN_PATH.maven-metadata.xml
+
+# Android Arm32 release Flutter artifacts
+ARCH_OUT=$ENGINE_OUT/android_release
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-arm-release
+ZIPS_DEST=$INFRA_ROOT/android-arm-release
+gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+gsutil cp $ZIPS_OUT/symbols.zip $ZIPS_DEST/symbols.zip
+# Android Arm32 release Maven artifacts
+ARCH_PATH=$ARCH_OUT/armeabi_v7a_release
+MAVEN_PATH=$MAVEN_ROOT/armeabi_v7a_release/$MAVEN_VER/armeabi_v7a_release-$MAVEN_VER
+gsutil cp $ARCH_PATH.pom $MAVEN_PATH.pom
+gsutil cp $ARCH_PATH.jar $MAVEN_PATH.jar
+gsutil cp $ARCH_PATH.maven-metadata.xml $MAVEN_PATH.maven-metadata.xml
+
+# Not sure which flutter_embedding_release files to use? 32 or 64 bit?
+# It does not seem to contain the libflutter.so file, but does seem to
+# differ between the two build dirs.
+ARCH_OUT=$ENGINE_OUT/android_release
+ARCH_PATH=$ARCH_OUT/flutter_embedding_release
+MAVEN_PATH=$MAVEN_ROOT/flutter_embedding_release/$MAVEN_VER/flutter_embedding_release-$MAVEN_VER
+gsutil cp $ARCH_PATH.pom $MAVEN_PATH.pom
+gsutil cp $ARCH_PATH.jar $MAVEN_PATH.jar
+gsutil cp $ARCH_PATH.maven-metadata.xml $MAVEN_PATH.maven-metadata.xml
+
+# Android x64 release Flutter artifacts
+ARCH_OUT=$ENGINE_OUT/android_release_x64
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-x64-release
+ZIPS_DEST=$INFRA_ROOT/android-x64-release
+gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+gsutil cp $ZIPS_OUT/symbols.zip $ZIPS_DEST/symbols.zip
+# Android x64 release Maven artifacts
+ARCH_PATH=$ARCH_OUT/x86_64_release
+MAVEN_PATH=$MAVEN_ROOT/x86_64_release/$MAVEN_VER/x86_64_release-$MAVEN_VER
+gsutil cp $ARCH_PATH.pom $MAVEN_PATH.pom
+gsutil cp $ARCH_PATH.jar $MAVEN_PATH.jar
+gsutil cp $ARCH_PATH.maven-metadata.xml $MAVEN_PATH.maven-metadata.xml
+
+# Shorebird AOT Tools (Linker)
+gsutil cp $ENGINE_OUT/host_release/aot_tools/aot-tools.dill $SHOREBIRD_ROOT/aot-tools.dill
+
+# Common Product-mode artifacts
+ARCH_OUT=$ENGINE_OUT/host_release
+ZIPS_OUT=$ARCH_OUT/zip_archives
+ZIPS_DEST=$INFRA_ROOT
+gsutil cp $ZIPS_OUT/flutter_patched_sdk_product.zip $ZIPS_DEST/flutter_patched_sdk_product.zip
+
+# We want to build flutter/tools/font_subset, but that doesn't work with
+# --no-prebuilt-dart-sdk.
+# https://github.com/flutter/flutter/issues/164531
+# Linux x64 host_release font_subset (ConstFinder)
+# ARCH_OUT=$ENGINE_OUT/host_release
+# ZIPS_OUT=$ARCH_OUT/zip_archives/$HOST_ARCH
+# ZIPS_DEST=$INFRA_ROOT/linux-x64-release
+# gsutil cp $ZIPS_OUT/font-subset.zip $ZIPS_DEST/font-subset.zip
+
+# Linux Desktop Support
+ARCH_OUT=$ENGINE_OUT/host_release
+ZIPS_OUT=$ARCH_OUT/zip_archives/linux-x64-release
+ZIPS_DEST=$INFRA_ROOT/linux-x64-release
+gsutil cp $ZIPS_OUT/linux-x64-flutter-gtk.zip $ZIPS_DEST/linux-x64-flutter-gtk.zip
+
+ARCH_OUT=$ENGINE_OUT/host_debug
+ZIPS_OUT=$ARCH_OUT/zip_archives/$HOST_ARCH
+ZIPS_DEST=$INFRA_ROOT/$HOST_ARCH
+gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
+
+# We could upload patch if we built it here.
+# gsutil cp $ENGINE_OUT/host_release/patch.zip $SHOREBIRD_ROOT/patch-win-x64.zip
diff --git a/shorebird/ci/internal/mac_build.sh b/shorebird/ci/internal/mac_build.sh
new file mode 100755
index 0000000000000..a860da431f269
--- /dev/null
+++ b/shorebird/ci/internal/mac_build.sh
@@ -0,0 +1,204 @@
+#!/bin/bash -e
+
+# FIXME: This script should be deleted and instead these steps be part
+# of the GN build process.
+# I haven't investigated how to build rust from GN with the Android NDK yet.
+
+# Usage:
+# ./mac_build.sh engine_path
+
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 engine_path"
+    exit 1
+fi
+
+# Convert to an absolute path so we don't need to worry about cd'ing back to
+# the root directory between commands.
+ENGINE_ROOT=$(realpath $1)
+
+ENGINE_SRC=$ENGINE_ROOT/src
+ENGINE_OUT=$ENGINE_SRC/out
+UPDATER_SRC=$ENGINE_SRC/flutter/third_party/updater
+HOST_ARCH='darwin-x64'
+
+# Build the Rust library.
+cd $UPDATER_SRC/library
+
+# Build iOS and MacOS
+cargo build \
+  --target aarch64-apple-ios \
+  --target x86_64-apple-ios \
+  --target aarch64-apple-darwin \
+  --target x86_64-apple-darwin \
+  --release
+
+# Build the patch tool.
+# Again, this belongs as part of the gn build.
+cd $UPDATER_SRC/patch
+cargo build --release
+
+# Compile the engine using the steps here:
+# https://github.com/flutter/flutter/wiki/Compiling-the-engine#compiling-for-android-from-macos-or-linux
+cd $ENGINE_SRC
+
+NINJA="ninja"
+GN=./flutter/tools/gn
+ET=./flutter/bin/et
+# We could probably use our own prebuilt dart SDK, by modifying the gn files.
+# `--no-enable-unittests` is needed on Flutter 3.10.1 and 3.10.2 to avoid
+# https://github.com/flutter/flutter/issues/128135
+GN_ARGS="--no-rbe --no-enable-unittests"
+
+# FIXME: These build commands likely could build fewer targets.
+
+# Mac doesn't seem to use "archive_gen_snapshot" as a target name yet.
+# https://github.com/flutter/flutter/issues/105351#issuecomment-1650686247
+ANDROID_TARGETS="flutter/shell/platform/android:gen_snapshot"
+
+# Because Flutter does not yet build universal binaries for macOS, we need to
+# ensure we're building for x64 for the time being so we can support both Intel
+# and Apple Silicon Macs. We do this by telling gn to use host_cpu="x64".
+
+# Android arm64 release
+$GN $GN_ARGS --android --android-cpu=arm64 --runtime-mode=release --gn-args='host_cpu="x64"'
+$NINJA -C ./out/android_release_arm64 $ANDROID_TARGETS
+
+# Android arm32 release
+$GN $GN_ARGS --runtime-mode=release --android --gn-args='host_cpu="x64"'
+$NINJA -C out/android_release $ANDROID_TARGETS
+
+# Android x64 release
+$GN $GN_ARGS --android --android-cpu=x64 --runtime-mode=release --gn-args='host_cpu="x64"'
+$NINJA -C ./out/android_release_x64 $ANDROID_TARGETS
+
+# We only need two targets (per the mac builders):
+# "flutter/shell/platform/darwin/ios:flutter_framework",
+# "flutter/lib/snapshot:generate_snapshot_bins", which builds both gen_snapshot and analyze_snapshot binaries.
+# https://github.com/flutter/engine/blob/main/ci/builders/mac_ios_engine.json#L139
+# https://github.com/flutter/engine/blob/main/ci/builders/README.md
+# The files created by these targets are packaged into a framework and an artifacts.zip file
+# by the create_full_ios_framework.py and create_macos_framework.py scripts.
+
+IOS_TARGETS="flutter/shell/platform/darwin/ios:flutter_framework flutter/lib/snapshot:generate_snapshot_bins"
+# You will also need to build vm_platform_strong.dill if you're using a local engine build.
+
+# From ci/builders/mac_host_engine.json in the engine repo
+MACOS_TARGETS="flutter/shell/platform/darwin/macos:zip_macos_flutter_framework flutter/lib/snapshot:generate_snapshot_bins flutter/build/archives:artifacts"
+
+# Build x64 Dart SDK
+$GN $GN_ARGS --runtime-mode=release --mac-cpu=x64 --no-prebuilt-dart-sdk
+$NINJA -C out/host_release dart_sdk
+# We want to build flutter/tools/font_subset, but that doesn't work with
+# --no-prebuilt-dart-sdk.
+# https://github.com/flutter/flutter/issues/164531
+
+# Build arm64 Dart SDK
+$GN $GN_ARGS --runtime-mode=release  --mac-cpu=arm64 --no-prebuilt-dart-sdk
+$NINJA -C out/host_release_arm64 dart_sdk
+# We want to build flutter/tools/font_subset, but that doesn't work with
+# --no-prebuilt-dart-sdk.
+# https://github.com/flutter/flutter/issues/164531
+
+# iOS arm64 release
+$GN $GN_ARGS --runtime-mode=release  --ios --gn-arg='shorebird_runtime=true'
+$NINJA -C out/ios_release $IOS_TARGETS
+
+$GN $GN_ARGS --ios --runtime-mode=release --darwin-extension-safe --xcode-symlinks  --gn-arg='shorebird_runtime=true'
+$NINJA -C out/ios_release_extension_safe $IOS_TARGETS
+
+# iOS simulator-x64 release
+$GN $GN_ARGS  --runtime-mode=debug  --ios --simulator
+$NINJA -C out/ios_debug_sim $IOS_TARGETS
+
+$GN $GN_ARGS --runtime-mode=debug --darwin-extension-safe  --ios --simulator
+$NINJA -C out/ios_debug_sim_extension_safe $IOS_TARGETS
+
+# iOS simulator-arm64 release
+$GN $GN_ARGS --runtime-mode=debug  --ios --simulator --simulator-cpu=arm64
+$NINJA -C out/ios_debug_sim_arm64 $IOS_TARGETS
+
+$GN $GN_ARGS --runtime-mode=debug --darwin-extension-safe  --ios --simulator --simulator-cpu=arm64
+$NINJA -C out/ios_debug_sim_arm64_extension_safe $IOS_TARGETS
+
+# macOS arm64 release
+$GN $GN_ARGS --runtime-mode=release  --mac --mac-cpu=arm64
+$NINJA -C out/mac_release_arm64 $MACOS_TARGETS
+
+# macOS x64 release
+# Note: we don't enable the simulator here because the simulator is an arm64 simulator,
+# which won't work for x64 apps.
+$GN $GN_ARGS --runtime-mode=release  --mac --mac-cpu=x64
+$NINJA -C out/mac_release $MACOS_TARGETS
+
+# The python scripts below fail if the out/release directory already exists.
+rm -rf out/release
+
+# We have to create a composite Flutter.framework for iOS and macOS, matching
+# what the Flutter builders do:
+IOS_FRAMEWORK_OUT=out/release
+echo "Building Flutter.framework for iOS"
+python3 flutter/sky/tools/create_ios_framework.py \
+    --dst $IOS_FRAMEWORK_OUT \
+    --arm64-out-dir out/ios_release \
+    --simulator-x64-out-dir out/ios_debug_sim \
+    --simulator-arm64-out-dir out/ios_debug_sim_arm64 \
+    --dsym \
+    --strip
+echo "Built Flutter.framework for iOS"
+
+MAC_FRAMEWORK_OUT=out/release/framework
+echo "Building Flutter.framework for macOS"
+python3 flutter/sky/tools/create_macos_framework.py \
+    --dst $MAC_FRAMEWORK_OUT \
+    --arm64-out-dir out/mac_release_arm64 \
+    --x64-out-dir out/mac_release \
+    --dsym \
+    --strip \
+    --zip
+echo "Built Flutter.framework for macOS"
+
+echo "Creating macOS gen_snapshot"
+python3 flutter/sky/tools/create_macos_gen_snapshots.py \
+    --dst out/release/snapshot \
+    --arm64-path out/mac_release_arm64/universal/gen_snapshot_arm64 \
+    --x64-path out/mac_release/universal/gen_snapshot_x64 \
+    --zip
+echo "Created macOS gen_snapshot"
+
+# Zip the dSYMs
+zip -r $IOS_FRAMEWORK_OUT/Flutter.framework.dSYM.zip $IOS_FRAMEWORK_OUT/Flutter.framework.dSYM
+zip -r $MAC_FRAMEWORK_OUT/FlutterMacOS.framework.dSYM.zip $MAC_FRAMEWORK_OUT/FlutterMacOS.framework.dSYM
+
+sign_flutter_xcframework() {
+    pushd $ENGINE_OUT/release
+
+    # Unzip the artifacts zip file, which contains the Flutter.xcframework.
+    rm -rf artifacts
+    unzip artifacts.zip -d artifacts
+
+    # Keep a copy of the old artifacts.zip for now, we may decide to remove this later
+    mv artifacts.zip artifacts.old.zip
+
+    # Sign the Flutter.xcframework
+    cd artifacts
+
+    # In case the artifacts are already signed, remove the signature
+    codesign -v --remove-signature Flutter.xcframework
+    codesign -v --sign "Apple Distribution: Code Town Inc (6V53YACS2W)" Flutter.xcframework
+
+    # Zip the artifacts back up
+    zip -r "../artifacts.zip" *
+
+    # Cleanup
+    cd ..
+    rm -rf artifacts
+
+    popd
+}
+
+sign_flutter_xcframework
+
+# Create out/engine_stamp.json
+# We can remove this explicit step once we're using et in any of the lines
+# above.
+$ET stamp
diff --git a/shorebird/ci/internal/mac_setup.sh b/shorebird/ci/internal/mac_setup.sh
new file mode 100755
index 0000000000000..8453f8b9b1a9e
--- /dev/null
+++ b/shorebird/ci/internal/mac_setup.sh
@@ -0,0 +1,11 @@
+#!/bin/bash -e
+
+# Usage:
+# ./mac_setup.sh
+
+# This assumes rust is installed, but could also install rust/cargo.
+rustup target add \
+   x86_64-apple-ios \
+   aarch64-apple-ios \
+   aarch64-apple-darwin \
+   x86_64-apple-darwin
diff --git a/shorebird/ci/internal/mac_upload.sh b/shorebird/ci/internal/mac_upload.sh
new file mode 100755
index 0000000000000..d136f0873c4bd
--- /dev/null
+++ b/shorebird/ci/internal/mac_upload.sh
@@ -0,0 +1,178 @@
+#!/bin/bash -e
+
+# Usage:
+# ./mac_upload.sh engine_path git_hash
+
+# Convert to an absolute path so we don't need to worry about cd'ing back to
+# the root directory between commands.
+ENGINE_ROOT=$(realpath $1)
+ENGINE_HASH=$2
+
+# Get the absolute path to the directory of this script.
+SCRIPT_DIR=$(cd $(dirname $0) && pwd)
+
+STORAGE_BUCKET="download.shorebird.dev"
+SHOREBIRD_ROOT=gs://$STORAGE_BUCKET/shorebird/$ENGINE_HASH
+
+ENGINE_SRC=$ENGINE_ROOT/src
+ENGINE_OUT=$ENGINE_SRC/out
+ENGINE_FLUTTER=$ENGINE_SRC/flutter
+
+cd $ENGINE_FLUTTER
+
+# Compute the content-aware hash for the Dart SDK.
+# This allows Flutter checkouts that haven't changed engine content to share
+# the same pre-built Dart SDK, even if they have different git commit SHAs.
+CONTENT_HASH=$($ENGINE_FLUTTER/bin/internal/content_aware_hash.sh)
+# Can't just `git merge-base` because the engine branches for each
+# major version (e.g. 3.7, 3.8) (e.g. upstream/flutter-3.7-candidate.1)
+# but it's not clear which branch we're forked from, only that we took
+# some tag and added our commits (but we don't know what tag).
+BASE_FLUTTER_TAG=`git describe --tags --abbrev=0`
+# Read the first line from bin/internal/engine.version file and trim whitespace.
+BASE_ENGINE_HASH=`git show $BASE_FLUTTER_TAG:bin/internal/engine.version | head -n 1 | tr -d '[:space:]'`
+
+# Build the artifacts manifest:
+MANIFEST_FILE=`mktemp`
+# Note that any uploads which are *not* listed in the manifest will be
+# ignored by the artifact proxy.
+# if you add uploads here, they also need to be reflected in the manifest.
+$SCRIPT_DIR/generate_manifest.sh $BASE_ENGINE_HASH > $MANIFEST_FILE
+
+# FIXME: This should not be in shell, it's too complicated/repetitive.
+# Only need the libflutter.so (and flutter.jar) artifacts
+# Artifact list: https://github.com/shorebirdtech/shorebird/blob/main/packages/artifact_proxy/lib/config.dart
+
+HOST_ARCH='darwin-x64'
+ARM64_HOST_ARCH='darwin-arm64'
+
+INFRA_ROOT="gs://$STORAGE_BUCKET/flutter_infra_release/flutter/$ENGINE_HASH"
+
+# engine_stamp.json
+ENGINE_STAMP_FILE=$ENGINE_OUT/engine_stamp.json
+gsutil cp $ENGINE_STAMP_FILE $INFRA_ROOT/engine_stamp.json
+
+# Dart SDK
+# This gets uploaded to flutter_infra_release/flutter/\$engine/dart-sdk-$HOST_ARCH.zip
+# We also upload to the content-aware hash path to support local development branches.
+CONTENT_INFRA_ROOT="gs://$STORAGE_BUCKET/flutter_infra_release/flutter/$CONTENT_HASH"
+
+# x64 Dart SDK
+HOST_RELEASE=$ENGINE_OUT/host_release
+DART_ZIP_FILE=dart-sdk-$HOST_ARCH.zip
+(
+    cd $HOST_RELEASE;
+    zip -r $DART_ZIP_FILE dart-sdk
+)
+ZIPS_DEST=$INFRA_ROOT/$DART_ZIP_FILE
+gsutil cp $HOST_RELEASE/$DART_ZIP_FILE $ZIPS_DEST
+# Also upload to content-aware hash path
+gsutil cp $HOST_RELEASE/$DART_ZIP_FILE $CONTENT_INFRA_ROOT/$DART_ZIP_FILE
+
+# arm64 Dart SDK
+HOST_RELEASE_ARM64=$ENGINE_OUT/host_release_arm64
+DART_ZIP_FILE=dart-sdk-$ARM64_HOST_ARCH.zip
+(
+    cd $HOST_RELEASE_ARM64;
+    zip -r $DART_ZIP_FILE dart-sdk
+)
+ZIPS_DEST=$INFRA_ROOT/$DART_ZIP_FILE
+gsutil cp $HOST_RELEASE_ARM64/$DART_ZIP_FILE $ZIPS_DEST
+# Also upload to content-aware hash path
+gsutil cp $HOST_RELEASE_ARM64/$DART_ZIP_FILE $CONTENT_INFRA_ROOT/$DART_ZIP_FILE
+
+# We want to build flutter/tools/font_subset, but that doesn't work with
+# --no-prebuilt-dart-sdk.
+# https://github.com/flutter/flutter/issues/164531
+# # mac x64 host_release font_subset (ConstFinder)
+# ARCH_OUT=$ENGINE_OUT/host_release
+# ZIPS_OUT=$ARCH_OUT/zip_archives/$HOST_ARCH
+# ZIPS_DEST=$INFRA_ROOT/darwin-x64-release
+# gsutil cp $ZIPS_OUT/font-subset.zip $ZIPS_DEST/font-subset.zip
+
+# # mac arm64 host_release font_subset (ConstFinder)
+# ARCH_OUT=$ENGINE_OUT/host_release_arm64
+# ZIPS_OUT=$ARCH_OUT/zip_archives/$HOST_ARCH
+# ZIPS_DEST=$INFRA_ROOT/darwin-arm64-release
+# gsutil cp $ZIPS_OUT/font-subset.zip $ZIPS_DEST/font-subset.zip
+
+# Android Arm64 release gen_snapshot
+ARCH_OUT=$ENGINE_OUT/android_release_arm64
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-arm64-release
+ZIPS_DEST=$INFRA_ROOT/android-arm64-release
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+
+# Android Arm32 release gen_snapshot
+ARCH_OUT=$ENGINE_OUT/android_release
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-arm-release
+ZIPS_DEST=$INFRA_ROOT/android-arm-release
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+
+# Android x64 release gen_snapshot
+ARCH_OUT=$ENGINE_OUT/android_release_x64
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-x64-release
+ZIPS_DEST=$INFRA_ROOT/android-x64-release
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+
+# Match the upload pattern from iOS:
+# https://github.com/flutter/engine/commit/1d7f0c66c316a37105601b13136f890f6595aebc
+
+# iOS release Flutter artifacts
+ARCH_OUT=$ENGINE_OUT/release
+ZIPS_OUT=$ARCH_OUT
+ZIPS_DEST=$INFRA_ROOT/ios-release
+gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
+
+# iOS dSYM
+gsutil cp $ZIPS_OUT/Flutter.framework.dSYM.zip $ZIPS_DEST/Flutter.framework.dSYM.zip
+
+# macOS framework
+ARCH_OUT=$ENGINE_OUT/release
+ZIPS_OUT=$ARCH_OUT/framework
+ZIPS_DEST=$INFRA_ROOT/darwin-x64-release
+gsutil cp $ZIPS_OUT/framework.zip $ZIPS_DEST/framework.zip
+
+# macOS gen_snapshot
+ARCH_OUT=$ENGINE_OUT/release
+ZIPS_OUT=$ARCH_OUT/snapshot
+ZIPS_DEST=$INFRA_ROOT/darwin-x64-release
+gsutil cp $ZIPS_OUT/gen_snapshot.zip $ZIPS_DEST/gen_snapshot.zip
+
+# FIXME: these should go where we're putting the arm64 macOS artifacts
+# (darwin-x64-release), however, arm macs use darwin-x64-release and we
+# currently only support those. We need to find a way to support both.
+# macOS x64 release artifacts
+# ARCH_OUT=$ENGINE_OUT/mac_release
+# ZIPS_OUT=$ARCH_OUT/zip_archives/darwin-x64-release
+# ZIPS_DEST=$INFRA_ROOT/darwin-x64-release
+# gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
+
+# macOS arm64 release artifacts
+ARCH_OUT=$ENGINE_OUT/mac_release_arm64
+ZIPS_OUT=$ARCH_OUT/zip_archives/darwin-arm64-release
+# This looks wrong - why are we putting arm64 artifacts in darwin-x64-release
+# instead of darwin-arm64-release? This is because arm macs use darwin-x64-release
+# and we need to use the artifacts we've built for arm64 macs.
+ZIPS_DEST=$INFRA_ROOT/darwin-x64-release
+gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
+
+# macOS dSYM (used for symbolication, not by Flutter)
+ARCH_OUT=$ENGINE_OUT/release
+ZIPS_OUT=$ARCH_OUT/framework
+ZIPS_DEST=$INFRA_ROOT/darwin-x64
+gsutil cp $ZIPS_OUT/FlutterMacOS.framework.dSYM.zip $ZIPS_DEST/FlutterMacOS.framework.dSYM.zip
+
+TMP_DIR=$(mktemp -d)
+
+PATCH_VERSION=0.2.1
+GH_RELEASE=https://github.com/shorebirdtech/updater/releases/download/patch-v$PATCH_VERSION/
+cd $TMP_DIR
+curl -L $GH_RELEASE/patch-x86_64-apple-darwin.zip -o patch-x86_64-apple-darwin.zip
+curl -L $GH_RELEASE/patch-x86_64-pc-windows-msvc.zip -o patch-x86_64-pc-windows-msvc.zip
+curl -L $GH_RELEASE/patch-x86_64-unknown-linux-musl.zip -o patch-x86_64-unknown-linux-musl.zip
+
+gsutil cp patch-x86_64-apple-darwin.zip $SHOREBIRD_ROOT/patch-darwin-x64.zip
+gsutil cp patch-x86_64-pc-windows-msvc.zip $SHOREBIRD_ROOT/patch-windows-x64.zip
+gsutil cp patch-x86_64-unknown-linux-musl.zip $SHOREBIRD_ROOT/patch-linux-x64.zip
+
+gsutil cp $MANIFEST_FILE $SHOREBIRD_ROOT/artifacts_manifest.yaml
diff --git a/shorebird/ci/internal/win_build.sh b/shorebird/ci/internal/win_build.sh
new file mode 100755
index 0000000000000..2df02670aa78f
--- /dev/null
+++ b/shorebird/ci/internal/win_build.sh
@@ -0,0 +1,63 @@
+#!/bin/bash -e
+
+# Usage:
+# ./win_build.sh engine_path
+
+ENGINE_ROOT=$1
+
+ENGINE_SRC=$ENGINE_ROOT/src
+ENGINE_OUT=$ENGINE_SRC/out
+UPDATER_SRC=$ENGINE_SRC/flutter/third_party/updater
+HOST_ARCH='windows-x64'
+
+# Build the Rust library.
+cd $UPDATER_SRC/library
+
+cargo build --release \
+  --target x86_64-pc-windows-msvc
+
+# Compile the engine using the steps here:
+# https://github.com/flutter/flutter/wiki/Compiling-the-engine#compiling-for-android-from-macos-or-linux
+cd $ENGINE_SRC
+
+NINJA="ninja"
+GN=./flutter/tools/gn
+# We could probably use our own prebuilt dart SDK, by modifying the gn files.
+GN_ARGS="--no-rbe --no-enable-unittests"
+
+# Windows only needs gen_snapshot for each Android CPU type.
+# See https://github.com/flutter/engine/blob/e590b24f3962fda3ec9144dcee3f7565b195839a/ci/builders/windows_android_aot_engine.json
+
+TARGETS="archive_win_gen_snapshot"
+
+# Build host_release
+$GN $GN_ARGS --runtime-mode=release --no-prebuilt-dart-sdk
+$NINJA -C out/host_release dart_sdk
+# We want to build flutter/tools/font_subset, but that doesn't work with
+# --no-prebuilt-dart-sdk.
+# https://github.com/flutter/flutter/issues/164531
+
+# Build windows desktop targets
+$GN $GN_ARGS --runtime-mode=release --no-prebuilt-dart-sdk
+$NINJA -C ./out/host_release flutter/build/archives:windows_flutter gen_snapshot windows flutter/build/archives:artifacts
+
+# Build debug Windows artifacts
+# These are output to the `windows-x64` directory in host_debug, and are used
+# by `flutter build windows --release`.
+$GN $GN_ARGS --no-prebuilt-dart-sdk
+$NINJA -C ./out/host_debug flutter/build/archives:artifacts
+
+# If this gives you trouble, try using VS2019 instead.  I had trouble with 2022.
+# Android arm64 release
+$GN $GN_ARGS --android --android-cpu=arm64 --runtime-mode=release
+$NINJA -C ./out/android_release_arm64 $TARGETS
+
+# Android arm32 release
+$GN $GN_ARGS --runtime-mode=release --android
+$NINJA -C out/android_release $TARGETS
+
+# Android x64 release
+$GN $GN_ARGS --android --android-cpu=x64 --runtime-mode=release
+$NINJA -C ./out/android_release_x64 $TARGETS
+
+# We could also build the `patch` tool for Windows here.
diff --git a/shorebird/ci/internal/win_setup.sh b/shorebird/ci/internal/win_setup.sh
new file mode 100755
index 0000000000000..971135644f66b
--- /dev/null
+++ b/shorebird/ci/internal/win_setup.sh
@@ -0,0 +1,8 @@
+#!/bin/bash -e
+
+# Usage:
+# ./windows_setup.sh
+
+# Add the MSVC toolchain to Rust.
+rustup target add \
+  x86_64-pc-windows-msvc
diff --git a/shorebird/ci/internal/win_upload.sh b/shorebird/ci/internal/win_upload.sh
new file mode 100755
index 0000000000000..8f5d461b4674b
--- /dev/null
+++ b/shorebird/ci/internal/win_upload.sh
@@ -0,0 +1,88 @@
+#!/bin/bash -e
+
+# Usage:
+# ./win_upload.sh engine_path git_hash
+ENGINE_ROOT=$1
+ENGINE_HASH=$2
+
+STORAGE_BUCKET="download.shorebird.dev"
+SHOREBIRD_ROOT=gs://$STORAGE_BUCKET/shorebird/$ENGINE_HASH
+
+ENGINE_SRC=$ENGINE_ROOT/src
+ENGINE_OUT=$ENGINE_SRC/out
+ENGINE_FLUTTER=$ENGINE_SRC/flutter
+
+cd $ENGINE_FLUTTER
+
+# Compute the content-aware hash for the Dart SDK.
+# This allows Flutter checkouts that haven't changed engine content to share
+# the same pre-built Dart SDK, even if they have different git commit SHAs.
+CONTENT_HASH=$($ENGINE_FLUTTER/bin/internal/content_aware_hash.sh)
+
+# We do not generate a manifest file, we assume another builder did that.
+
+# TODO(eseidel): This should not be in shell, it's too complicated/repetitive.
+
+HOST_ARCH='windows-x64'
+
+INFRA_ROOT="gs://$STORAGE_BUCKET/flutter_infra_release/flutter/$ENGINE_HASH"
+
+# Dart SDK
+# This gets uploaded to flutter_infra_release/flutter/\$engine/dart-sdk-$HOST_ARCH.zip
+# We also upload to the content-aware hash path to support local development branches.
+CONTENT_INFRA_ROOT="gs://$STORAGE_BUCKET/flutter_infra_release/flutter/$CONTENT_HASH"
+
+DART_SDK_DIR=$ENGINE_OUT/host_release/dart-sdk
+DART_ZIP_FILE=dart-sdk-$HOST_ARCH.zip
+
+# Use 7zip to compress the Dart SDK, as zip isn't available on Windows and
+# Powershell, which we would normally use in the form of
+# `powershell Compress-Archive dart-sdk dart-sdk.zip`, doesn't play nicely
+# with git bash paths (e.g. /c/Users/... instead of C:/Users/...)
+/c/Program\ Files/7-Zip/7z a $DART_ZIP_FILE $DART_SDK_DIR
+ZIPS_DEST=$INFRA_ROOT/$DART_ZIP_FILE
+gsutil cp $DART_ZIP_FILE $ZIPS_DEST
+# Also upload to content-aware hash path
+gsutil cp $DART_ZIP_FILE $CONTENT_INFRA_ROOT/$DART_ZIP_FILE
+
+# Android Arm64 release gen_snapshot
+ARCH_OUT=$ENGINE_OUT/android_release_arm64
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-arm64-release
+ZIPS_DEST=$INFRA_ROOT/android-arm64-release
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+
+# Android Arm32 release gen_snapshot
+ARCH_OUT=$ENGINE_OUT/android_release
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-arm-release
+ZIPS_DEST=$INFRA_ROOT/android-arm-release
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+
+# Android x64 release gen_snapshot
+ARCH_OUT=$ENGINE_OUT/android_release_x64
+ZIPS_OUT=$ARCH_OUT/zip_archives/android-x64-release
+ZIPS_DEST=$INFRA_ROOT/android-x64-release
+gsutil cp $ZIPS_OUT/$HOST_ARCH.zip $ZIPS_DEST/$HOST_ARCH.zip
+
+# We could upload patch if we built it here.
+# gsutil cp $ENGINE_OUT/host_release/patch.zip $SHOREBIRD_ROOT/patch-win-x64.zip
+
+# Engine release artifacts
+ARCH_OUT=$ENGINE_OUT/host_release
+ZIPS_OUT=$ARCH_OUT/zip_archives/$HOST_ARCH-release
+ZIPS_DEST=$INFRA_ROOT/$HOST_ARCH-release
+gsutil cp $ZIPS_OUT/$HOST_ARCH-flutter.zip $ZIPS_DEST/$HOST_ARCH-flutter.zip
+
+# We want to build flutter/tools/font_subset, but that doesn't work with
+# --no-prebuilt-dart-sdk.
+# https://github.com/flutter/flutter/issues/164531
+# # Windows x64 host_release font_subset (ConstFinder)
+# ARCH_OUT=$ENGINE_OUT/host_release
+# ZIPS_OUT=$ARCH_OUT/zip_archives/$HOST_ARCH
+# ZIPS_DEST=$INFRA_ROOT/windows-x64-release
+# gsutil cp $ZIPS_OUT/font-subset.zip $ZIPS_DEST/font-subset.zip
+
+# Engine debug artifacts (not sure why this is needed?)
+ARCH_OUT=$ENGINE_OUT/host_debug
+ZIPS_OUT=$ARCH_OUT/zip_archives/$HOST_ARCH
+ZIPS_DEST=$INFRA_ROOT/$HOST_ARCH
+gsutil cp $ZIPS_OUT/artifacts.zip $ZIPS_DEST/artifacts.zip
diff --git a/shorebird/ci/linux_build_and_upload.sh b/shorebird/ci/linux_build_and_upload.sh
new file mode 100755
index 0000000000000..9657e14178695
--- /dev/null
+++ b/shorebird/ci/linux_build_and_upload.sh
@@ -0,0 +1,32 @@
+#!/bin/bash -e
+
+# Usage:
+# ./linux_build_and_upload.sh flutter_root engine_hash
+#
+# This is the main entrypoint for building and uploading Linux engine artifacts.
+# It is called from the _build_engine repository's CI scripts.
+
+if [ "$#" -ne 2 ]; then
+    echo "Usage: $0 flutter_root engine_hash"
+    exit 1
+fi
+
+FLUTTER_ROOT=$1
+ENGINE_HASH=$2
+ENGINE_ROOT=$FLUTTER_ROOT/engine
+
+# Get the absolute path to the directory of this script.
+SCRIPT_DIR=$(cd $(dirname $0) && pwd)
+
+echo "Building engine at $ENGINE_ROOT and uploading to gs://download.shorebird.dev"
+
+cd $SCRIPT_DIR
+
+# Run the setup script.
+./internal/linux_setup.sh
+
+# Then run the build.
+./internal/linux_build.sh $ENGINE_ROOT
+
+# Copy Shorebird engine artifacts to Google Cloud Storage.
+./internal/linux_upload.sh $ENGINE_ROOT $ENGINE_HASH
diff --git a/shorebird/ci/mac_build_and_upload.sh b/shorebird/ci/mac_build_and_upload.sh
new file mode 100755
index 0000000000000..9ee302620d207
--- /dev/null
+++ b/shorebird/ci/mac_build_and_upload.sh
@@ -0,0 +1,32 @@
+#!/bin/bash -e
+
+# Usage:
+# ./mac_build_and_upload.sh flutter_root engine_hash
+#
+# This is the main entrypoint for building and uploading macOS engine artifacts.
+# It is called from the _build_engine repository's CI scripts.
+
+if [ "$#" -ne 2 ]; then
+    echo "Usage: $0 flutter_root engine_hash"
+    exit 1
+fi
+
+FLUTTER_ROOT=$1
+ENGINE_HASH=$2
+ENGINE_ROOT=$FLUTTER_ROOT/engine
+
+# Get the absolute path to the directory of this script.
+SCRIPT_DIR=$(cd $(dirname $0) && pwd)
+
+echo "Building engine at $ENGINE_ROOT and uploading to gs://download.shorebird.dev"
+
+cd $SCRIPT_DIR
+
+# Run the setup script.
+./internal/mac_setup.sh
+
+# Then run the build.
+./internal/mac_build.sh $ENGINE_ROOT
+
+# Copy Shorebird engine artifacts to Google Cloud Storage.
+./internal/mac_upload.sh $ENGINE_ROOT $ENGINE_HASH
diff --git a/shorebird/ci/win_build_and_upload.sh b/shorebird/ci/win_build_and_upload.sh
new file mode 100755
index 0000000000000..bbda403ff2c67
--- /dev/null
+++ b/shorebird/ci/win_build_and_upload.sh
@@ -0,0 +1,32 @@
+#!/bin/bash -e
+
+# Usage:
+# ./win_build_and_upload.sh flutter_root engine_hash
+#
+# This is the main entrypoint for building and uploading Windows engine artifacts.
+# It is called from the _build_engine repository's CI scripts.
+
+if [ "$#" -ne 2 ]; then
+    echo "Usage: $0 flutter_root engine_hash"
+    exit 1
+fi
+
+FLUTTER_ROOT=$1
+ENGINE_HASH=$2
+ENGINE_ROOT=$FLUTTER_ROOT/engine
+
+# Get the absolute path to the directory of this script.
+SCRIPT_DIR=$(cd $(dirname $0) && pwd)
+
+echo "Building engine at $ENGINE_ROOT and uploading to gs://download.shorebird.dev"
+
+cd $SCRIPT_DIR
+
+# Run the setup script.
+./internal/win_setup.sh
+
+# Then run the build.
+./internal/win_build.sh $ENGINE_ROOT
+
+# Copy Shorebird engine artifacts to Google Cloud Storage.
+./internal/win_upload.sh $ENGINE_ROOT $ENGINE_HASH

From 96c5d6c5b691b434f978a1e00295d3934fa20d67 Mon Sep 17 00:00:00 2001
From: Eric Seidel <eric@shorebird.dev>
Date: Fri, 12 Dec 2025 14:47:16 -0800
Subject: [PATCH 2/2] chore: fix path of content_aware_hash.sh

---
 shorebird/ci/internal/linux_upload.sh | 6 ++++--
 shorebird/ci/internal/mac_upload.sh   | 6 ++++--
 shorebird/ci/internal/win_upload.sh   | 6 ++++--
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/shorebird/ci/internal/linux_upload.sh b/shorebird/ci/internal/linux_upload.sh
index a374cc29d9781..873f0f3edb969 100755
--- a/shorebird/ci/internal/linux_upload.sh
+++ b/shorebird/ci/internal/linux_upload.sh
@@ -14,13 +14,15 @@ SHOREBIRD_ROOT=gs://$STORAGE_BUCKET/shorebird/$ENGINE_HASH
 ENGINE_SRC=$ENGINE_ROOT/src
 ENGINE_OUT=$ENGINE_SRC/out
 ENGINE_FLUTTER=$ENGINE_SRC/flutter
+# FLUTTER_ROOT is the Flutter monorepo root (parent of engine/)
+FLUTTER_ROOT=$(dirname $ENGINE_ROOT)
 
-cd $ENGINE_FLUTTER
+cd $FLUTTER_ROOT
 
 # Compute the content-aware hash for the Dart SDK.
 # This allows Flutter checkouts that haven't changed engine content to share
 # the same pre-built Dart SDK, even if they have different git commit SHAs.
-CONTENT_HASH=$($ENGINE_FLUTTER/bin/internal/content_aware_hash.sh)
+CONTENT_HASH=$($FLUTTER_ROOT/bin/internal/content_aware_hash.sh)
 
 # We do not generate a manifest file, we assume another builder did that.
 # TODO(bryanoltman): should we generate a manifest file as part of an upload
diff --git a/shorebird/ci/internal/mac_upload.sh b/shorebird/ci/internal/mac_upload.sh
index d136f0873c4bd..8ec266246a8e1 100755
--- a/shorebird/ci/internal/mac_upload.sh
+++ b/shorebird/ci/internal/mac_upload.sh
@@ -17,13 +17,15 @@ SHOREBIRD_ROOT=gs://$STORAGE_BUCKET/shorebird/$ENGINE_HASH
 ENGINE_SRC=$ENGINE_ROOT/src
 ENGINE_OUT=$ENGINE_SRC/out
 ENGINE_FLUTTER=$ENGINE_SRC/flutter
+# FLUTTER_ROOT is the Flutter monorepo root (parent of engine/)
+FLUTTER_ROOT=$(dirname $ENGINE_ROOT)
 
-cd $ENGINE_FLUTTER
+cd $FLUTTER_ROOT
 
 # Compute the content-aware hash for the Dart SDK.
 # This allows Flutter checkouts that haven't changed engine content to share
 # the same pre-built Dart SDK, even if they have different git commit SHAs.
-CONTENT_HASH=$($ENGINE_FLUTTER/bin/internal/content_aware_hash.sh)
+CONTENT_HASH=$($FLUTTER_ROOT/bin/internal/content_aware_hash.sh)
 # Can't just `git merge-base` because the engine branches for each
 # major version (e.g. 3.7, 3.8) (e.g. upstream/flutter-3.7-candidate.1)
 # but it's not clear which branch we're forked from, only that we took
diff --git a/shorebird/ci/internal/win_upload.sh b/shorebird/ci/internal/win_upload.sh
index 8f5d461b4674b..952457109e40c 100755
--- a/shorebird/ci/internal/win_upload.sh
+++ b/shorebird/ci/internal/win_upload.sh
@@ -11,13 +11,15 @@ SHOREBIRD_ROOT=gs://$STORAGE_BUCKET/shorebird/$ENGINE_HASH
 ENGINE_SRC=$ENGINE_ROOT/src
 ENGINE_OUT=$ENGINE_SRC/out
 ENGINE_FLUTTER=$ENGINE_SRC/flutter
+# FLUTTER_ROOT is the Flutter monorepo root (parent of engine/)
+FLUTTER_ROOT=$(dirname $ENGINE_ROOT)
 
-cd $ENGINE_FLUTTER
+cd $FLUTTER_ROOT
 
 # Compute the content-aware hash for the Dart SDK.
 # This allows Flutter checkouts that haven't changed engine content to share
 # the same pre-built Dart SDK, even if they have different git commit SHAs.
-CONTENT_HASH=$($ENGINE_FLUTTER/bin/internal/content_aware_hash.sh)
+CONTENT_HASH=$($FLUTTER_ROOT/bin/internal/content_aware_hash.sh)
 
 # We do not generate a manifest file, we assume another builder did that.