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File README.md of Package spack-image

# Spack %%spack_version%% Container Image

Spack is a package manager for supercomputers. It provides build recipes
for > 6k software components and allows to build entire HPC application
stacks with little to no prerequisites installed.

This container image serves as a build environment for a `Dockerfile`
or an `apptainter.def` file created by `spack containerize`. It can be
used to run spack commands directly as well. Doing this may require to
bind-mount local directories into the container.

## How to use the image

This image may be used to build and containerize application stacks using
Spack. The stack will be installed in a base container such as SLE BCI Base.
To build a containerized application stack, create the file `spack.yaml`
in an empty directory with the content:
```yaml
spack:
  specs:
  - <application spec>

container:
    format: <container_format>
    images:
      build: "registry.suse.com/suse/spack:%%spack_version%%-%RELEASE%"
      final: "registry.suse.com/bci/bci-base:latest"
    os_packages:
      command: zypper
      build:
      - <additional packages for building>
      final:
      - <additional packages for final container>
```
Replace 'application spec' by the application name, optionally with
additional build specifications (for details consult the
[Spack documentation](https://spack.readthedocs.io/en/latest/)).
The 'container_format' can be either `docker` for a docker/OCI container
image or `singularity` for a Singularity/Apptainer container image.
The `os_packages` section is optional. Here you may specify additional
packages which should be installed in the build container or on the final
runtime container image.
To build an Apptainer container, run the following commands in the same
directory:
```ShellSession
$ spack containerize > apptainer.def
$ apptainer build apptainer.sif apptainer.def
```
This will build `apptainer.sif` as the final Singularity/Apptainer image
which you may run:
```ShellSession
$ apptainer exec ./apptainer.sif <command line ...>
```
To build a docker/OCI container, run the following:
```ShellSession
$ spack containerize > Containerfile
$ podman build -t <target_name> --format=docker .
```
This builds a Docker container which you can run with:
```
$ podman run -it --rm <target_name> <command line ...>
```
If you do not have a local installation of Spack, you may use this container
to run Spack commands - like `spack containerize`:
```ShellSession
$ podman run -v $(pwd):/root:Z --rm registry.suse.com/suse/spack:%%spack_version%%-%RELEASE% containerize > Containerfile
```
For futher details check the
(Spack documentation on container images)[https://spack.readthedocs.io/en/latest/containers.html].

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