$ git clone -n https://src.fedoraproject.org/rpms/prometheus-jmx-exporter.git /var/lib/mock/f41-build-709004-13013/root/chroot_tmpdir/scmroot/prometheus-jmx-exporter
Cloning into '/var/lib/mock/f41-build-709004-13013/root/chroot_tmpdir/scmroot/prometheus-jmx-exporter'...
$ git fetch origin b197607ab84ecb09c81382475b3a765c63c1a664:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/prometheus-jmx-exporter
 * [new ref]         b197607ab84ecb09c81382475b3a765c63c1a664 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b197607 Eliminate use of obsolete %patchN syntax (#2283636)