feat: Add native Linux build with mamba environment

Add automated setup script and environment configuration for building
ml-metadata natively on Linux without Docker.

- environment.yml: mamba environment with Python 3.11, GCC toolchain
- setup_and_build.sh: automated Miniforge/Bazelisk install and build
- .bazelrc: GCC compatibility flags (C11/C++17, warning suppressions)

Enables building on SSH/bare metal systems without sudo access.

Author: czgdp1807

.bazelrc

@@ -26,3 +26,19 @@ build --protocopt=--experimental_allow_proto3_optional
 build --incompatible_require_linker_input_cc_api=false
 build:macos --apple_platform_type=macos
 build:macos_arm64 --cpu=darwin_arm64
+build --conlyopt=-std=c11
+build --host_conlyopt=-std=c11
+build --cxxopt=-std=c++17
+build --host_cxxopt=-std=c++17
+build --copt=-Wno-error
+build --cxxopt=-Wno-error
+build --cxxopt=-fpermissive
+build --copt=-Wno-array-parameter
+build --copt=-Wno-implicit-function-declaration
+build --host_copt=-Wno-error
+build --host_cxxopt=-Wno-error
+build --host_cxxopt=-fpermissive
+build --host_copt=-Wno-array-parameter
+build --host_copt=-Wno-implicit-function-declaration
+build --linkopt=-Wl,--no-as-needed
+build --host_linkopt=-Wl,--no-as-needed

environment.yml

@@ -0,0 +1,16 @@
+name: ml-metadata-build
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - python=3.11
+  - cmake=3.31
+  - make
+  - pkg-config
+  - c-compiler
+  - cxx-compiler
+  - openjdk=21
+  - setuptools
+  - wheel
+  - pip
+

setup_and_build.sh

@@ -0,0 +1,141 @@
+#!/bin/bash
+set -e  # Exit on any error
+
+# Configuration
+MINIFORGE_DIR="$HOME/miniforge3"
+ENV_NAME="ml-metadata-build"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo "=========================================="
+echo "ML-Metadata Native Build Setup Script"
+echo "=========================================="
+echo ""
+
+# Step 1: Install Miniforge (includes mamba) if not already installed
+if [ ! -d "$MINIFORGE_DIR" ]; then
+    echo "Step 1: Installing Miniforge (includes mamba)..."
+    cd /tmp
+
+    # Detect architecture
+    if [ "$(uname -m)" = "x86_64" ]; then
+        MINIFORGE_URL="https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-Linux-x86_64.sh"
+    elif [ "$(uname -m)" = "aarch64" ]; then
+        MINIFORGE_URL="https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-Linux-aarch64.sh"
+    else
+        echo "Unsupported architecture: $(uname -m)"
+        exit 1
+    fi
+
+    wget "$MINIFORGE_URL" -O miniforge.sh
+    bash miniforge.sh -b -p "$MINIFORGE_DIR"
+    rm miniforge.sh
+
+    echo "Miniforge installed to $MINIFORGE_DIR"
+else
+    echo "Step 1: Miniforge already installed at $MINIFORGE_DIR"
+fi
+
+# Step 2: Install Bazelisk if not already installed
+BIN_DIR="$HOME/.local/bin"
+mkdir -p "$BIN_DIR"
+
+if [ ! -f "$BIN_DIR/bazelisk" ]; then
+    echo ""
+    echo "Step 2: Installing Bazelisk..."
+    cd /tmp
+
+    # Detect architecture
+    if [ "$(uname -m)" = "x86_64" ]; then
+        BAZELISK_URL="https://github.com/bazelbuild/bazelisk/releases/download/v1.25.0/bazelisk-linux-amd64"
+    elif [ "$(uname -m)" = "aarch64" ]; then
+        BAZELISK_URL="https://github.com/bazelbuild/bazelisk/releases/download/v1.25.0/bazelisk-linux-arm64"
+    else
+        echo "Unsupported architecture: $(uname -m)"
+        exit 1
+    fi
+
+    wget "$BAZELISK_URL" -O "$BIN_DIR/bazelisk"
+    chmod +x "$BIN_DIR/bazelisk"
+
+    # Create bazel symlink
+    ln -sf "$BIN_DIR/bazelisk" "$BIN_DIR/bazel"
+
+    echo "Bazelisk installed to $BIN_DIR/bazelisk"
+else
+    echo ""
+    echo "Step 2: Bazelisk already installed at $BIN_DIR/bazelisk"
+fi
+
+# Add to PATH for this session
+export PATH="$BIN_DIR:$PATH"
+
+# Set Bazel version to use
+export USE_BAZEL_VERSION=6.5.0
+
+# Step 3: Initialize conda/mamba for this shell session
+echo ""
+echo "Step 3: Initializing mamba..."
+source "$MINIFORGE_DIR/etc/profile.d/conda.sh"
+source "$MINIFORGE_DIR/etc/profile.d/mamba.sh"
+
+# Step 4: Create environment from environment.yml if it doesn't exist
+echo ""
+echo "Step 4: Setting up conda environment '$ENV_NAME'..."
+if conda env list | grep -q "^$ENV_NAME "; then
+    echo "Environment '$ENV_NAME' already exists. Updating it..."
+    cd "$SCRIPT_DIR"
+    mamba env update -n "$ENV_NAME" -f environment.yml
+else
+    echo "Creating environment '$ENV_NAME' from environment.yml..."
+    cd "$SCRIPT_DIR"
+    mamba env create -f environment.yml
+fi
+
+# Step 5: Activate the environment
+echo ""
+echo "Step 5: Activating environment '$ENV_NAME'..."
+conda activate "$ENV_NAME"
+
+# Verify environment
+echo ""
+echo "Environment verification:"
+echo "  Python: $(which python) ($(python --version))"
+echo "  Bazelisk: $(which bazelisk)"
+echo "  CMake: $(cmake --version | head -n1)"
+echo "  GCC: $(gcc --version | head -n1)"
+
+# Step 6: Build the wheel
+echo ""
+echo "Step 6: Building ml-metadata wheel..."
+cd "$SCRIPT_DIR"
+
+# Clean previous build artifacts if requested
+if [ "$1" = "--clean" ]; then
+    echo "Cleaning previous build artifacts..."
+    bazel clean
+    rm -rf build/ dist/ *.egg-info
+fi
+
+# Build the wheel
+echo ""
+echo "Starting build (this may take several minutes)..."
+python setup.py bdist_wheel
+
+# Show results
+echo ""
+echo "=========================================="
+echo "Build completed successfully!"
+echo "=========================================="
+echo ""
+echo "Wheel file(s):"
+ls -lh dist/*.whl
+echo ""
+echo "To install the wheel:"
+echo "  pip install dist/ml_metadata-*.whl"
+echo ""
+echo "To rebuild in the future:"
+echo "  1. export PATH=\$HOME/.local/bin:\$PATH"
+echo "  2. source $MINIFORGE_DIR/etc/profile.d/conda.sh"
+echo "  3. conda activate $ENV_NAME"
+echo "  4. python setup.py bdist_wheel"
+echo ""