$ git clone -n https://src.fedoraproject.org/rpms/fntsample.git /var/lib/mock/f40-build-800074-142750/root/chroot_tmpdir/scmroot/fntsample
Cloning into '/var/lib/mock/f40-build-800074-142750/root/chroot_tmpdir/scmroot/fntsample'...
$ git fetch origin 3c0bfd246909c22c7b3080f5a6b59d81ae33db02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fntsample
 * [new ref]         3c0bfd246909c22c7b3080f5a6b59d81ae33db02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c0bfd2 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild