$ git clone -n https://src.fedoraproject.org/rpms/diff-pdf.git /var/lib/mock/f33-build-491749-64182/root/chroot_tmpdir/scmroot/diff-pdf
Cloning into '/var/lib/mock/f33-build-491749-64182/root/chroot_tmpdir/scmroot/diff-pdf'...
$ git reset --hard 504e67b039f777f05543efb03a180e5b2991b6b3
HEAD is now at 504e67b Do not require poppler-cairo.