$ git clone -n https://src.fedoraproject.org/rpms/clamtk.git /var/lib/mock/f40-build-2225972-52886/root/chroot_tmpdir/scmroot/clamtk
Cloning into '/var/lib/mock/f40-build-2225972-52886/root/chroot_tmpdir/scmroot/clamtk'...
$ git fetch origin e7bcc56b80da9524cd0217837a2e994c60f04ad5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clamtk
 * [new ref]         e7bcc56b80da9524cd0217837a2e994c60f04ad5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7bcc56 Update to 6.17