$ git clone -n https://src.fedoraproject.org/rpms/rrdtool.git /var/lib/mock/f41-build-814557-148971/root/chroot_tmpdir/scmroot/rrdtool
Cloning into '/var/lib/mock/f41-build-814557-148971/root/chroot_tmpdir/scmroot/rrdtool'...
$ git fetch origin 14bb13def2cc390813fb801690ce7791cc5a44e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rrdtool
 * [new ref]         14bb13def2cc390813fb801690ce7791cc5a44e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14bb13d Perl 5.40 rebuild