Community Call - 3rd August (Cancelled)

[dtrudg]

Due to August being a month of holidays for many, we've decided to cancel the 3rd August SingularityCE Community Call.

Below is a brief update of development progress. We hope to see you on Thursday 7th September, where we expect to be demonstrating the new features of the SingularityCE 4.0.0 release candidate.

Please don't hesitate to discuss any development topics here, on Google Groups, or in the SingularityCE Slack workspace.

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August Development Update

Rework of remote command

The singularity remote command has been overloaded for some time, causing confusion.

For 4.0.0 @preminger has been working to split credentials mangement for OCI registries into a new singularity registry command, and standalone keyserver management into a new singularity keyserver command.

The singularity remote command is now dedicated to the management of SCS (cloud.sylabs.io) and Singularity Enterprise, or compatible, remote endpoints only. Output of the list subcommand has also been tidied up.

--oci Mode

The SingularityCE compilation process now builds and bundles a modern version of squashfuse, to avoid issues running SIF containers on distributions that provide an older versions. Multithreaded squashfuse_ll is preferred.

OCI-SIF images are automatically detected, so that the oci-sif prefix is not needed to run them.

OCI-SIF images can now be pushed and pulled to/from library:// and docker:// URIs, as OCI images with a single squashfs layer. They can also be pushed to OCI registries as a single file, using oras://.

Developer Related

The go.mod for github.com/sylabs/singularity will soon declare itself as v4 module, to match the application version of SingularityCE.

The location of code, whether in pkg/ or internal/pkg has been reviewed with the aim of following semantic versioning, as expected for go modules, from v4.

Push/pull to oras:// has been rewritten, to remove the oras-go/v1 dependency that has delayed other dependency updates in the past. Through SingularityCE 4.x we expect to additionally move from containers/image to google/go-containerregistry for OCI image handling. This will considerably reduce the number of go module dependencies that SingularityCE requires.

Release Candidate Progress

We hope to issue a 4.0.0 release candidate on or around 17th August.

Check the 4.0.0 GitHub milestone to monitor progress on the remaining work: https://github.com/sylabs/singularity/milestone/4