$ git clone -n https://src.fedoraproject.org/rpms/copr-rpmbuild.git /var/lib/mock/f40-build-2721448-73080/root/chroot_tmpdir/scmroot/copr-rpmbuild
Cloning into '/var/lib/mock/f40-build-2721448-73080/root/chroot_tmpdir/scmroot/copr-rpmbuild'...
$ git fetch origin 7110e9affea96ae696260e98ac4be7657f08778d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-rpmbuild
 * [new ref]         7110e9affea96ae696260e98ac4be7657f08778d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7110e9a Update copr-rpmbuild to 0.72-1