$ git clone -n https://src.fedoraproject.org/rpms/qgis.git /var/lib/mock/f42-build-863154-171455/root/chroot_tmpdir/scmroot/qgis
Cloning into '/var/lib/mock/f42-build-863154-171455/root/chroot_tmpdir/scmroot/qgis'...
$ git fetch origin b73b349503211759da88ed4ea6dbad92a7652fda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qgis
 * [new ref]         b73b349503211759da88ed4ea6dbad92a7652fda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b73b349 Update to 3.40.1