$ git clone -n https://src.fedoraproject.org/rpms/tkabber.git /var/lib/mock/f41-build-1164718-21583/root/chroot_tmpdir/scmroot/tkabber
Cloning into '/var/lib/mock/f41-build-1164718-21583/root/chroot_tmpdir/scmroot/tkabber'...
$ git fetch origin e02e5f2db0b53c7e684253bdb4b770dac47e0b07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tkabber
 * [new ref]         e02e5f2db0b53c7e684253bdb4b770dac47e0b07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e02e5f2 Eliminate use of obsolete %patchN syntax (#2283636)