$ git clone -n https://src.fedoraproject.org/rpms/clamav.git /var/lib/mock/f40-build-2110471-50655/root/chroot_tmpdir/scmroot/clamav
Cloning into '/var/lib/mock/f40-build-2110471-50655/root/chroot_tmpdir/scmroot/clamav'...
$ git fetch origin 66252cf620391bb82b7f2aaf363b6ddd19ce53e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clamav
 * [new ref]         66252cf620391bb82b7f2aaf363b6ddd19ce53e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66252cf Upload sources