$ git clone -n https://src.fedoraproject.org/rpms/copr-frontend.git /var/lib/mock/f41-build-side-1-2811113-32926/root/chroot_tmpdir/scmroot/copr-frontend
Cloning into '/var/lib/mock/f41-build-side-1-2811113-32926/root/chroot_tmpdir/scmroot/copr-frontend'...
$ git fetch origin 4c653dde55f2c93d71c9c133b372f6868854bb0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-frontend
 * [new ref]         4c653dde55f2c93d71c9c133b372f6868854bb0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c653dd Update copr-frontend to 2.0-1