$ git clone -n https://src.fedoraproject.org/rpms/giac.git /var/lib/mock/f40-build-2696127-69549/root/chroot_tmpdir/scmroot/giac
Cloning into '/var/lib/mock/f40-build-2696127-69549/root/chroot_tmpdir/scmroot/giac'...
$ git fetch origin cd4fecf8ef73370d62554843a3c134f1d5d7f17a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/giac
 * [new ref]         cd4fecf8ef73370d62554843a3c134f1d5d7f17a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd4fecf Rebuild for cocoalib 0.99850