$ git clone -n https://src.fedoraproject.org/rpms/orca.git /var/lib/mock/f40-build-2014202-45959/root/chroot_tmpdir/scmroot/orca
Cloning into '/var/lib/mock/f40-build-2014202-45959/root/chroot_tmpdir/scmroot/orca'...
$ git fetch origin ad75177e6574cea224964cac51bc7b6e4fb0bcb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/orca
 * [new ref]         ad75177e6574cea224964cac51bc7b6e4fb0bcb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad75177 Update to 45.1