Separate out spack.yaml; Dockerfile optimisations

docker/Dockerfile.devenv

@@ -1,32 +1,18 @@
 # Build stage with Spack pre-installed and ready to be used
 FROM spack/ubuntu-jammy:0.21 AS builder
 
-# What we want to install and how we want to install it
-# is specified in a manifest file (spack.yaml)
-RUN mkdir /opt/spack-environment \
-&&  (echo spack: \
-&&   echo '  packages:' \
-&&   echo '    all:' \
-&&   echo '      compiler: [gcc@11.4.0]' \
-&&   echo '  specs:' \
-&&   echo '  - cmake@3.27.7' \
-&&   echo '  - gmake' \
-&&   echo '  - hdf5@1.14.3' \
-&&   echo '  - netcdf-c@4.9.2+mpi+parallel-netcdf' \
-&&   echo '  - netcdf-fortran' \
-&&   echo '  - openmpi@4.1.6' \
-&&   echo '  concretizer:' \
-&&   echo '    unify: true' \
-&&   echo '  config:' \
-&&   echo '    install_missing_compilers: true' \
-&&   echo '    install_tree: /opt/software' \
-&&   echo '  view: /opt/views/view') > /opt/spack-environment/spack.yaml
-
-# Install the software, remove unnecessary deps
-RUN cd /opt/spack-environment && spack env activate . && spack install --fail-fast && spack gc -y
+# Install software from spack.yaml
+RUN mkdir /opt/spack-environment
+COPY docker/spack.yaml /opt/spack-environment/spack.yaml
+RUN cd /opt/spack-environment \
+    && spack env activate . \
+    && spack install --fail-fast \
+    && spack gc -y
 
 # Install perl URI lib
-RUN apt update && apt install -y libany-uri-escape-perl
+RUN apt update \
+    && apt install -y --no-install-recommends libany-uri-escape-perl \
+    && rm -rf /var/lib/apt/lists/*
 
 # Strip all the binaries
 RUN find -L /opt/views/view/* -type f -exec readlink -f '{}' \; | \
@@ -36,27 +22,31 @@ RUN find -L /opt/views/view/* -type f -exec readlink -f '{}' \; | \
     awk -F: '{print $1}' | xargs strip
 
 # Modifications to the environment that are necessary to run
-RUN cd /opt/spack-environment && \
-    spack env activate --sh -d . > activate.sh
+RUN cd /opt/spack-environment \
+    && spack env activate --sh -d . > activate.sh
 
 # Bare OS image to run the installed executables
-FROM ubuntu:22.04
+FROM ubuntu:latest
 
+# Copy necessary files from the builder stage
 COPY --from=builder /opt/spack-environment /opt/spack-environment
 COPY --from=builder /opt/software /opt/software
 COPY --from=builder /usr /usr
-
 # paths.view is a symlink, so copy the parent to avoid dereferencing and duplicating it
 COPY --from=builder /opt/views /opt/views
 
+# Create entrypoint script
 RUN { \
-      echo '#!/bin/sh' \
-      && echo '.' /opt/spack-environment/activate.sh \
-      && echo 'exec "$@"'; \
+      echo '#!/bin/sh'; \
+      echo '. /opt/spack-environment/activate.sh'; \
+      echo 'exec "$@"'; \
     } > /entrypoint.sh \
-&& chmod a+x /entrypoint.sh \
-&& ln -s /opt/views/view /opt/view \
-&& apt update && apt install -y ca-certificates cpp m4
+    && chmod a+x /entrypoint.sh \
+    && ln -s /opt/views/view /opt/view \
+    && apt update \
+    && apt install -y --no-install-recommends ca-certificates cpp m4
+    && rm -rf /var/lib/apt/lists/*
 
+# Set entrypoint and default command
 ENTRYPOINT [ "/entrypoint.sh" ]
 CMD [ "/bin/bash" ]

docker/spack.yaml

@@ -0,0 +1,17 @@
+spack:
+  packages:
+    all:
+      compiler: [gcc@11.4.0]
+  specs:
+  - cmake
+  - gmake
+  - hdf5
+  - netcdf-c+mpi+parallel-netcdf
+  - netcdf-fortran
+  - openmpi
+  concretizer:
+    unify: true
+  config:
+    install_missing_compilers: true
+    install_tree: /opt/software
+  view: /opt/views/view