$ git clone -n https://src.fedoraproject.org/rpms/pptpd.git /var/lib/mock/f40-build-2154536-50916/root/chroot_tmpdir/scmroot/pptpd
Cloning into '/var/lib/mock/f40-build-2154536-50916/root/chroot_tmpdir/scmroot/pptpd'...
$ git fetch origin e03cbb6910f9ec19df8ae6bbb022f90db7acf743:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pptpd
 * [new ref]         e03cbb6910f9ec19df8ae6bbb022f90db7acf743 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e03cbb6 Fixed build with ppp-2.5.0