$ git clone -n https://src.fedoraproject.org/rpms/R-png.git /var/lib/mock/f40-build-2270281-54803/root/chroot_tmpdir/scmroot/R-png
Cloning into '/var/lib/mock/f40-build-2270281-54803/root/chroot_tmpdir/scmroot/R-png'...
$ git fetch origin 1b6ef5134dbc8d41c6952f4d6afad1b455543429:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-png
 * [new ref]         1b6ef5134dbc8d41c6952f4d6afad1b455543429 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b6ef51 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild