$ git clone -n https://src.fedoraproject.org/rpms/pdfio.git /var/lib/mock/f45-build-21497-586/root/chroot_tmpdir/scmroot/pdfio
Cloning into '/var/lib/mock/f45-build-21497-586/root/chroot_tmpdir/scmroot/pdfio'...
$ git fetch origin ff631eb58cf97381ac9c5ffc59b25e2bcc5f8d76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pdfio
 * [new ref]         ff631eb58cf97381ac9c5ffc59b25e2bcc5f8d76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff631eb 1.6.5