$ git clone -n https://src.fedoraproject.org/rpms/resalloc.git /var/lib/mock/f40-build-2099420-50441/root/chroot_tmpdir/scmroot/resalloc
Cloning into '/var/lib/mock/f40-build-2099420-50441/root/chroot_tmpdir/scmroot/resalloc'...
$ git fetch origin e5b007b815f378cc175fc2dec789bacd2dfc53b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/resalloc
 * [new ref]         e5b007b815f378cc175fc2dec789bacd2dfc53b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5b007b New upstream release