$ git clone -n https://src.fedoraproject.org/rpms/cockatrice.git /var/lib/mock/f40-build-2217327-52546/root/chroot_tmpdir/scmroot/cockatrice
Cloning into '/var/lib/mock/f40-build-2217327-52546/root/chroot_tmpdir/scmroot/cockatrice'...
$ git fetch origin aa9fb759a134ed5da2c679be139755441a871b8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockatrice
 * [new ref]         aa9fb759a134ed5da2c679be139755441a871b8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa9fb75 New upstream version (RHBZ#1827451)