$ git clone -n https://src.fedoraproject.org/rpms/classified-ads.git /var/lib/mock/f42-build-893864-192184/root/chroot_tmpdir/scmroot/classified-ads
Cloning into '/var/lib/mock/f42-build-893864-192184/root/chroot_tmpdir/scmroot/classified-ads'...
$ git fetch origin bc5a4b20ed0737e49a8fa534d2dd5ba1bedf352e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/classified-ads
 * [new ref]         bc5a4b20ed0737e49a8fa534d2dd5ba1bedf352e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc5a4b2 Rebuild for updated dependencies