$ git clone -n https://src.fedoraproject.org/rpms/perl-Tk-GraphViz.git /var/lib/mock/f45-build-27167-621/root/chroot_tmpdir/scmroot/perl-Tk-GraphViz
Cloning into '/var/lib/mock/f45-build-27167-621/root/chroot_tmpdir/scmroot/perl-Tk-GraphViz'...
$ git fetch origin 80f9bee73bc6174be967c7b926adcd96bd8aece6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tk-GraphViz
 * [new ref]         80f9bee73bc6174be967c7b926adcd96bd8aece6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80f9bee Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild