cloud_build/flutter_agy_docker/Dockerfile.base

# Copyright 2022 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# ==========================================
# STAGE 1: The Heavy Downloader
# ==========================================
FROM ubuntu:24.04 AS flutter-fetcher

# 1. Define the ARG with a fallback default version
ARG FLUTTER_VERSION="3.44.3"

ENV TZ="America/Los_Angeles" \
    DEBIAN_FRONTEND=noninteractive \
    FLUTTER_ROOT="/opt/flutter" \
    PATH="/opt/flutter/bin:/home/coder/.local/bin:${PATH}" \
    LANG="en_US.UTF-8" \
    LANGUAGE="en_US:en" \
    LC_ALL="en_US.UTF-8" \
    TERM="xterm-256color" \
    COLORTERM="truecolor" \
    SHELL="/usr/bin/zsh"

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
        curl ca-certificates xz-utils git unzip && \
    rm -rf /var/lib/apt/lists/*

# Evict the default ubuntu user and create the target user
RUN set -ex; \
    (userdel -r ubuntu 2>/dev/null || true); \
    groupadd -g 1000 coder; \
    useradd -u 1000 -g 1000 -m coder;  \
    mkdir -p /app /opt/flutter /home/linuxbrew/.linuxbrew; \
    chown -R coder:coder /app /opt /home/linuxbrew;

USER coder

RUN set -ex; \
    export PATH="/opt/flutter/bin:${PATH}"; \
    # 1. Download and uncompress the flutter tool
    curl -fsSL https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_${FLUTTER_VERSION}-stable.tar.xz | tar -xJ --no-same-owner -C /opt; \
    # 2. Run config to ONLY ENABLE web (and disable everything else)
    flutter config \
        --enable-web \
        --no-enable-linux-desktop \
        --no-enable-macos-desktop \
        --no-enable-windows-desktop \
        --no-enable-android \
        --no-enable-ios \
        --no-enable-fuchsia; \
    \
    # 3. Precache only the web artifacts
    flutter precache --web; \
    \
    # 4. Delete the heavy cache/artifacts/engine folder and test/gallery waste
    rm -rf /opt/flutter/bin/cache/artifacts/engine; \
    rm -rf /home/coder/.pub-cache/hosted/pub.dev/flutter_gallery_assets*; \
    rm -rf /home/coder/.pub-cache/hosted/pub.dev/googleapis*; \
    \
    # 5. Run doctor to finalize setup and verify web artifacts
    /opt/flutter/bin/flutter doctor -v; \
    \
    # 6. Log some stuff and setup analytics (user == human)
    flutter --version ; \
    flutter --enable-analytics; \
    dart --enable-analytics;

# 2. Lock in configuration and force the massive SDK downloads
ENV PATH="/opt/flutter/bin:${PATH}"