$ git clone -n https://src.fedoraproject.org/rpms/tcl-tkpng.git /var/lib/mock/f40-build-730669-103578/root/chroot_tmpdir/scmroot/tcl-tkpng
Cloning into '/var/lib/mock/f40-build-730669-103578/root/chroot_tmpdir/scmroot/tcl-tkpng'...
$ git fetch origin b2af3bb2e21cc465ccf79840bcd48fa211b4b99a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl-tkpng
 * [new ref]         b2af3bb2e21cc465ccf79840bcd48fa211b4b99a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2af3bb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild