multistage build for grpc

Author: clegginabox

Dockerfile

@@ -1,6 +1,37 @@
+FROM php:8.5-cli AS builder
+
+# Install strictly what is needed to COMPILE gRPC
+RUN apt-get update && apt-get install -y \
+    git \
+    cmake \
+    build-essential \
+    autoconf \
+    libtool \
+    pkg-config
+
+# Download and Compile gRPC (PR #40337)
+# We use /tmp/grpc to build
+WORKDIR /tmp/grpc
+RUN git clone --depth 1 https://github.com/grpc/grpc.git . \
+    && git fetch origin pull/40337/head:pr-40337 \
+    && git checkout pr-40337 \
+    && git submodule update --init --recursive --depth 1 \
+    && mkdir -p cmake/build && cd cmake/build \
+    # Build the C++ Core (Static Lib)
+    && cmake ../.. -DgRPC_INSTALL=ON -DgRPC_BUILD_TESTS=OFF \
+    && make -j$(nproc) \
+    && make install \
+    # Build the PHP Extension
+    && cd ../../src/php/ext/grpc \
+    && phpize \
+    && ./configure \
+    && make -j$(nproc) \
+    # We do NOT need 'make install' here, we just need the compiled .so file
+    && cp modules/grpc.so /tmp/grpc.so
+
 FROM php:8.5-cli
 
-# https://getcomposer.org/doc/03-cli.md#composer-allow-superuser
+# Standard Environment Setup
 ENV COMPOSER_ALLOW_SUPERUSER=1
 
 # Install system dependencies
@@ -13,13 +44,7 @@ RUN apt-get update && apt-get install -y \
     libonig-dev \
     libxml2-dev \
     default-mysql-client \
-    cmake \
-    build-essential \
-    autoconf \
-    libtool \
-    pkg-config \
-    && apt-get clean \
-    && rm -rf /var/lib/apt/lists/*
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 # Copy Composer from official image
 COPY --from=composer:2.8.9 /usr/bin/composer /usr/bin/composer
@@ -28,8 +53,7 @@ COPY --from=composer:2.8.9 /usr/bin/composer /usr/bin/composer
 COPY --from=mlocati/php-extension-installer:latest /usr/bin/install-php-extensions /usr/local/bin/
 
 # Install PHP extensions declaratively
-RUN install-php-extensions \
-    mysqli \
+RUN install-php-extensions mysqli \
     redis \
     pdo_mysql \
     pdo_pgsql \
@@ -42,26 +66,8 @@ RUN install-php-extensions \
     zip \
     pcov
 
-# Manually Build gRPC from PR #40337
-# This creates a temporary directory, clones the repo, fetches the specific PR,
-# builds the C++ core, then builds the PHP extension, and finally cleans up.
-RUN mkdir -p /tmp/grpc-build && cd /tmp/grpc-build \
-    && git clone https://github.com/grpc/grpc.git . \
-    && git fetch origin pull/40337/head:pr-40337 \
-    && git checkout pr-40337 \
-    && git submodule update --init --recursive \
-    # Build and install the gRPC C++ Core libraries first
-    && mkdir -p cmake/build && cd cmake/build \
-    && cmake ../.. -DgRPC_INSTALL=ON -DgRPC_BUILD_TESTS=OFF \
-    && make -j$(nproc) \
-    && make install \
-    # Now build the PHP extension referencing the core libs
-    && cd ../../src/php/ext/grpc \
-    && phpize \
-    && ./configure \
-    && make -j$(nproc) \
-    && make install \
-    # Enable the extension
-    && docker-php-ext-enable grpc \
-    # Cleanup source files to reduce image size
-    && cd / && rm -rf /tmp/grpc-build
+# Copy grpc to a temporary spot first, then move it to the correct dir dynamically
+COPY --from=builder /tmp/grpc.so /tmp/grpc.so
+RUN mv /tmp/grpc.so $(php-config --extension-dir) \
+    && docker-php-ext-enable grpc
+