$ git clone -n https://src.fedoraproject.org/rpms/gscan2pdf.git /var/lib/mock/f45-build-13072-446/root/chroot_tmpdir/scmroot/gscan2pdf
Cloning into '/var/lib/mock/f45-build-13072-446/root/chroot_tmpdir/scmroot/gscan2pdf'...
$ git fetch origin 6d284735956680206c5f6b637c8a9ca9bda86ef5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gscan2pdf
 * [new ref]         6d284735956680206c5f6b637c8a9ca9bda86ef5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d28473 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild