From 3d0b404b7a99388296dda50d087d267bf3c6f917 Mon Sep 17 00:00:00 2001
From: Jonathan Shimwell <mail@jshimwell.com>
Date: Tue, 28 Jun 2022 16:06:17 +0100
Subject: [PATCH 1/2] added multi stages option

---
 Dockerfile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 755d9f2a06..152590161a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@
 
 # sudo docker run image_name:tag_name or ID with no tag sudo docker run ID number
 
-FROM debian:bullseye-slim
+FROM debian:bullseye-slim AS dependencies
 
 # By default this Dockerfile builds OpenMC without DAGMC and LIBMESH support
 ARG build_dagmc=off
@@ -172,6 +172,8 @@ RUN if [ "$build_libmesh" = "on" ]; then \
         && rm -rf ${LIBMESH_INSTALL_DIR}/build ${LIBMESH_INSTALL_DIR}/libmesh ; \
     fi
 
+FROM dependencies as build
+
 # clone and install openmc
 RUN mkdir -p ${HOME}/OpenMC && cd ${HOME}/OpenMC \
     && git clone --shallow-submodules --recurse-submodules --single-branch -b ${openmc_branch} --depth=1 ${OPENMC_REPO} \
@@ -207,5 +209,7 @@ RUN mkdir -p ${HOME}/OpenMC && cd ${HOME}/OpenMC \
     && cd ../openmc && pip install .[test,depletion-mpi] \
     && python -c "import openmc"
 
+FROM build as release
+
 # Download cross sections (NNDC and WMP) and ENDF data needed by test suite
 RUN ${HOME}/OpenMC/openmc/tools/ci/download-xs.sh

From 419351bb260f837386bcd5c6e798405638820e17 Mon Sep 17 00:00:00 2001
From: Jonathan Shimwell <mail@jshimwell.com>
Date: Tue, 28 Jun 2022 16:14:52 +0100
Subject: [PATCH 2/2] uppercase AS

---
 Dockerfile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 152590161a..341390c9ae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -172,7 +172,7 @@ RUN if [ "$build_libmesh" = "on" ]; then \
         && rm -rf ${LIBMESH_INSTALL_DIR}/build ${LIBMESH_INSTALL_DIR}/libmesh ; \
     fi
 
-FROM dependencies as build
+FROM dependencies AS build
 
 # clone and install openmc
 RUN mkdir -p ${HOME}/OpenMC && cd ${HOME}/OpenMC \
@@ -209,7 +209,7 @@ RUN mkdir -p ${HOME}/OpenMC && cd ${HOME}/OpenMC \
     && cd ../openmc && pip install .[test,depletion-mpi] \
     && python -c "import openmc"
 
-FROM build as release
+FROM build AS release
 
 # Download cross sections (NNDC and WMP) and ENDF data needed by test suite
 RUN ${HOME}/OpenMC/openmc/tools/ci/download-xs.sh