$ git clone -n https://src.fedoraproject.org/rpms/rubygem-bson.git /var/lib/mock/f41-build-819767-151891/root/chroot_tmpdir/scmroot/rubygem-bson
Cloning into '/var/lib/mock/f41-build-819767-151891/root/chroot_tmpdir/scmroot/rubygem-bson'...
$ git fetch origin fb11026e6069f795b6a29ee38f5de6ce42066c28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-bson
 * [new ref]         fb11026e6069f795b6a29ee38f5de6ce42066c28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb11026 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild