Maintaining Spack Buildcache

This page details the efforts to create a buildcache for use in Spack CI tests in MAPL.

Useful Links

• Spack Buildcache Documentation
• setup-spack GitHub Action
• Possible Example

Building Packages on AWS

Preliminaries

Padded Length

Testing showed we apparently need to increase the length of the padding in the install tree. This is what I ran:

spack config add config:install_tree:padded_length:512

Building Packages

We want all the dependencies of MAPL, so we need to do:

spack install --only dependencies mapl

This (should) get us everything that MAPL needs to build.

Building the Buildcache

Create Spack Environment

It turns out, you can't build or push a buildcache unless you are in a Spack environment. So we need to create one:

spack env create mapl-buildcache
spack env activate -p mapl-buildcache

Add Packages to Environment

spack add esmf
spack add gftl gftl-shared fargparse pflogger pfunit yafyaml
spack add ecbuild udunits
spack concretize -f

Add mirror for buildcache

spack mirror add --oci-username mathomp4 --oci-password-variable <GITHUB TOKEN SEE 1PASSWORD> --unsigned mapl-buildcache oci://ghcr.io/mathomp4/mapl-buildcache

Pushing the Buildcache

spack buildcache push --update-index oci://ghcr.io/mathomp4/mapl-buildcache