From 37ff58100dd08bc8420646985a23180a56c458cb Mon Sep 17 00:00:00 2001
From: Atharva <ashirdhankar458@gmail.com>
Date: Thu, 13 Feb 2025 00:06:24 +0530
Subject: [PATCH] multi-stage dockerfile: This reduces image size to half
 compare to earlier image version size

---
 Dockerfile | 73 ++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 57 insertions(+), 16 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 4913c2a5..6fce152e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,9 @@
-FROM mcr.microsoft.com/devcontainers/cpp:dev-ubuntu-22.04
+# First Stage: Builder
+FROM mcr.microsoft.com/devcontainers/cpp:dev-ubuntu-22.04 AS builder
 
 ARG REINSTALL_CMAKE_VERSION_FROM_SOURCE="none"
 
-# Optionally install the cmake for vcpkg
+# Optionally install CMake for vcpkg
 COPY ./reinstall-cmake.sh /tmp/
 
 RUN if [ "${REINSTALL_CMAKE_VERSION_FROM_SOURCE}" != "none" ]; then \
@@ -10,25 +11,65 @@ RUN if [ "${REINSTALL_CMAKE_VERSION_FROM_SOURCE}" != "none" ]; then \
     fi \
     && rm -f /tmp/reinstall-cmake.sh
 
-RUN sed -i.bak "/^#.*deb-src.*universe$/s/^# //g" /etc/apt/sources.list \
-    && apt -y update \
-    && apt install -y --no-install-recommends \
+# Enable deb-src for dependencies
+RUN sed -i.bak "/^#.*deb-src.*universe$/s/^# //g" /etc/apt/sources.list && apt update
+
+# Install necessary build dependencies
+RUN apt install -y --no-install-recommends \
       software-properties-common \
       subversion \
-    && add-apt-repository --enable-source --yes "ppa:marutter/rrutter4.0" \
-    && wget -qO- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc | sudo tee -a /etc/apt/trusted.gpg.d/cran_ubuntu_key.asc \
+      wget \
+      gpg \
+      build-essential \
+      gfortran \
+      libxml2-dev \
+      libcurl4-openssl-dev \
+      libssl-dev \
+      libblas-dev \
+      liblapack-dev
+
+# Add R repository and install R
+RUN add-apt-repository --enable-source --yes "ppa:marutter/rrutter4.0" \
+    && wget -qO- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc | tee -a /etc/apt/trusted.gpg.d/cran_ubuntu_key.asc \
+    && apt update \
     && apt -y build-dep r-base-dev \
-    && apt -y install r-base-dev \
-    && Rscript -e "install.packages('languageserver', repos='https://cran.rstudio.com')" \
-    && Rscript -e "install.packages('httpgd', repos='https://cran.rstudio.com')" \
-    && rm -rf /var/lib/apt/lists/*
+    && apt -y install r-base-dev 
 
-RUN apt install shellcheck
-RUN apt install -y ccache
-#RUN /usr/sbin/update-ccache-symlinks
-#RUN echo 'export PATH="/usr/lib/ccache:$PATH"' | tee -a /home/vscode/.bashrc
+# Install R packages
+RUN Rscript -e "install.packages('languageserver', repos='https://cran.rstudio.com')" \
+    && Rscript -e "install.packages('httpgd', repos='https://cran.rstudio.com')"
 
+# Install shellcheck and ccache
+RUN apt install -y shellcheck ccache
 
+# Second Stage: Final Image
+FROM mcr.microsoft.com/devcontainers/cpp:dev-ubuntu-22.04 AS final
 
 ARG CONTAINER_VERSION
-ENV CONTAINER_VERSION ${CONTAINER_VERSION}
+ENV CONTAINER_VERSION=${CONTAINER_VERSION}
+
+# Install minimal runtime dependencies
+RUN apt update && apt install -y --no-install-recommends \
+    libxml2 \
+    libcurl4-openssl-dev \
+    libssl-dev \
+    libblas-dev \
+    liblapack-dev \
+    gfortran
+
+# Copy R installation from builder stage
+COPY --from=builder /usr/lib/R /usr/lib/R
+COPY --from=builder /usr/bin/R /usr/bin/R
+COPY --from=builder /usr/local/lib/R /usr/local/lib/R
+COPY --from=builder /usr/share/R /usr/share/R
+COPY --from=builder /etc/R /etc/R
+
+# Copy shared libraries
+COPY --from=builder /usr/lib/x86_64-linux-gnu /usr/lib/x86_64-linux-gnu
+
+# Set environment variables
+ENV PATH="/usr/lib/R/bin:$PATH"
+ENV LD_LIBRARY_PATH="/usr/lib/R/lib:/usr/lib/x86_64-linux-gnu"
+
+# Verify installation
+RUN ldconfig && R --version