OSG Software Repo Layout Migration¶

11 December 2024

On Monday, January 6th, 2025, the OSG Software Team will be upgrading the server that hosts the OSG Software Yum repositories (https://repo.osg-htc.org née https://repo.opensciencegrid.org), which will result in changes to the directory layout for the OSG 23 and OSG 24 Yum repos.

Users installing packages should not be affected since the URLs of the repositories themselves will not change. However, mirror administrators will have to take some action to avoid rsyncing those repos from scratch.

Perform the following steps:

Turn off rsync from repo-rsync.opensciencegrid.org or repo-rsync.osg-htc.org
Download the migration script from https://github.com/osg-htc/osg-repo-scripts/blob/el9/migrate.py (direct link)
Run the migration script on your OSG 23 and OSG 24 Yum repositories. For example, if the files on your mirror are under /mnt/mirror/osg, then run
```
python3 migrate.py /mnt/mirror/osg/23-* /mnt/mirror/osg/24-*
```

Switch the rsync source to repo-rsync-itb.osg-htc.org and add --delay-updates --delete-delay to the rsync command. For example, if your rsync command is typically

rsync -av --delete \
    repo-rsync.opensciencegrid.org::osg/ \
    /mnt/mirror/osg

then change it to

rsync -av --delay-updates --delete-delay \
    repo-rsync-itb.osg-htc.org::osg/ \
    /mnt/mirror/osg

This will switch your mirror to the new repo layout, minimizing disruption to users.

On January 6th, we will upgrade https://repo.osg-htc.org, at which point you should change your rsync source from repo-rsync-itb.osg-htc.org to repo-rsync.osg-htc.org. We will send a reminder after the update.