$ git clone -n https://src.fedoraproject.org/rpms/rubygem-nio4r.git /var/lib/mock/f39-build-1458723-33083/root/chroot_tmpdir/scmroot/rubygem-nio4r
Cloning into '/var/lib/mock/f39-build-1458723-33083/root/chroot_tmpdir/scmroot/rubygem-nio4r'...
$ git fetch origin 2dc22ebff75d2aed9ed8e15d71b8ae3bc63369ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-nio4r
 * [new ref]         2dc22ebff75d2aed9ed8e15d71b8ae3bc63369ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dc22eb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild