$ git clone -n https://src.fedoraproject.org/rpms/libpng.git /var/lib/mock/f40-build-786063-134151/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/f40-build-786063-134151/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin 6a6bbc173469c790d1ec9db2f4c067d1f141239f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpng
 * [new ref]         6a6bbc173469c790d1ec9db2f4c067d1f141239f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a6bbc1 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild