$ git clone -n https://src.fedoraproject.org/rpms/rubygem-eventmachine.git /var/lib/mock/f41-build-819778-151901/root/chroot_tmpdir/scmroot/rubygem-eventmachine
Cloning into '/var/lib/mock/f41-build-819778-151901/root/chroot_tmpdir/scmroot/rubygem-eventmachine'...
$ git fetch origin 814e81188fd94a3eed56798376dd967489db9f19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-eventmachine
 * [new ref]         814e81188fd94a3eed56798376dd967489db9f19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 814e811 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild