$ git clone -n https://src.fedoraproject.org/rpms/libpng15.git /var/lib/mock/f40-build-785741-134081/root/chroot_tmpdir/scmroot/libpng15
Cloning into '/var/lib/mock/f40-build-785741-134081/root/chroot_tmpdir/scmroot/libpng15'...
$ git fetch origin d4087ab8fba521d56068b250bda12c07ee5de7c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpng15
 * [new ref]         d4087ab8fba521d56068b250bda12c07ee5de7c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4087ab Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild