$ git clone -n https://src.fedoraproject.org/rpms/rubygem-pdfkit.git /var/lib/mock/f45-build-35154-693/root/chroot_tmpdir/scmroot/rubygem-pdfkit
Cloning into '/var/lib/mock/f45-build-35154-693/root/chroot_tmpdir/scmroot/rubygem-pdfkit'...
$ git fetch origin a8690bb0c7761b2f4574a5786d927088758c5a68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-pdfkit
 * [new ref]         a8690bb0c7761b2f4574a5786d927088758c5a68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8690bb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild