$ git clone -n https://src.fedoraproject.org/rpms/shrinkpdf.git /var/lib/mock/f45-build-35924-700/root/chroot_tmpdir/scmroot/shrinkpdf
Cloning into '/var/lib/mock/f45-build-35924-700/root/chroot_tmpdir/scmroot/shrinkpdf'...
$ git fetch origin 0a88ed142a83451c1cbdb11606c2000b2967183f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shrinkpdf
 * [new ref]         0a88ed142a83451c1cbdb11606c2000b2967183f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a88ed1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild