$ git clone -n https://src.fedoraproject.org/rpms/rust-png.git /var/lib/mock/f45-build-43939-809/root/chroot_tmpdir/scmroot/rust-png
Cloning into '/var/lib/mock/f45-build-43939-809/root/chroot_tmpdir/scmroot/rust-png'...
$ git fetch origin 0d8bfa3d3abb83fe097a1ce133414023a642e272:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-png
 * [new ref]         0d8bfa3d3abb83fe097a1ce133414023a642e272 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d8bfa3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild