$ git clone -n https://src.fedoraproject.org/rpms/golang-rsc-pdf.git /var/lib/mock/f45-build-12745-443/root/chroot_tmpdir/scmroot/golang-rsc-pdf
Cloning into '/var/lib/mock/f45-build-12745-443/root/chroot_tmpdir/scmroot/golang-rsc-pdf'...
$ git fetch origin e4c2413271070e50652f8b2b975d7a9cd98ad692:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-rsc-pdf
 * [new ref]         e4c2413271070e50652f8b2b975d7a9cd98ad692 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4c2413 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild