$ git clone -n https://src.fedoraproject.org/rpms/rust-png0.16.git /var/lib/mock/f40-build-2326676-58841/root/chroot_tmpdir/scmroot/rust-png0.16
Cloning into '/var/lib/mock/f40-build-2326676-58841/root/chroot_tmpdir/scmroot/rust-png0.16'...
$ git fetch origin 8a173ed6639b1c06bf0a2a04ed4ab9ffdea0991f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-png0.16
 * [new ref]         8a173ed6639b1c06bf0a2a04ed4ab9ffdea0991f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a173ed Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild