$ git clone -n https://src.fedoraproject.org/rpms/rubygem-domain_name.git /var/lib/mock/f39-build-1499246-34744/root/chroot_tmpdir/scmroot/rubygem-domain_name
Cloning into '/var/lib/mock/f39-build-1499246-34744/root/chroot_tmpdir/scmroot/rubygem-domain_name'...
$ git fetch origin 150d2f1245158e11650907b79be60d83ed4683e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-domain_name
 * [new ref]         150d2f1245158e11650907b79be60d83ed4683e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 150d2f1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild