$ git clone -n https://src.fedoraproject.org/rpms/orca.git /var/lib/mock/f41-build-side-1-2650180-27567/root/chroot_tmpdir/scmroot/orca
Cloning into '/var/lib/mock/f41-build-side-1-2650180-27567/root/chroot_tmpdir/scmroot/orca'...
$ git fetch origin 894ad9aacb08c668d62824c1e41e5e060648e4c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/orca
 * [new ref]         894ad9aacb08c668d62824c1e41e5e060648e4c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 894ad9a Update to 47.rc