$ git clone -n https://src.fedoraproject.org/rpms/libdatovka.git /var/lib/mock/f40-build-785268-133825/root/chroot_tmpdir/scmroot/libdatovka
Cloning into '/var/lib/mock/f40-build-785268-133825/root/chroot_tmpdir/scmroot/libdatovka'...
$ git fetch origin c9cab653f5a07a52fecae32b492b933d3e3e7906:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdatovka
 * [new ref]         c9cab653f5a07a52fecae32b492b933d3e3e7906 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9cab65 New version