$ git clone -n https://src.fedoraproject.org/rpms/copr-keygen.git /var/lib/mock/f41-build-side-1-2811102-32926/root/chroot_tmpdir/scmroot/copr-keygen
Cloning into '/var/lib/mock/f41-build-side-1-2811102-32926/root/chroot_tmpdir/scmroot/copr-keygen'...
$ git fetch origin 8a7d0707c03ca773628dd293b2cad81c9fb520b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-keygen
 * [new ref]         8a7d0707c03ca773628dd293b2cad81c9fb520b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a7d070 Update copr-keygen to 2.0-1