$ git clone -n https://src.fedoraproject.org/rpms/qt5-doc.git /var/lib/mock/f45-build-34001-676/root/chroot_tmpdir/scmroot/qt5-doc
Cloning into '/var/lib/mock/f45-build-34001-676/root/chroot_tmpdir/scmroot/qt5-doc'...
$ git fetch origin 2d71e462b9ebaa095bf8d7f800c5a08676b97495:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-doc
 * [new ref]         2d71e462b9ebaa095bf8d7f800c5a08676b97495 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d71e46 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild