$ git clone -n https://src.fedoraproject.org/rpms/pngcheck.git /var/lib/mock/f45-build-28659-632/root/chroot_tmpdir/scmroot/pngcheck
Cloning into '/var/lib/mock/f45-build-28659-632/root/chroot_tmpdir/scmroot/pngcheck'...
$ git fetch origin fdb4bfd93ad23fe192c1f27ec7b4c93c07bd8127:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pngcheck
 * [new ref]         fdb4bfd93ad23fe192c1f27ec7b4c93c07bd8127 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fdb4bfd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild