$ git clone -n https://src.fedoraproject.org/rpms/mailx.git /var/lib/mock/f40-build-2009963-45541/root/chroot_tmpdir/scmroot/mailx
Cloning into '/var/lib/mock/f40-build-2009963-45541/root/chroot_tmpdir/scmroot/mailx'...
$ git fetch origin 62dd2fbf0132ff39a7a4ec0c9db7167249b87459:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mailx
 * [new ref]         62dd2fbf0132ff39a7a4ec0c9db7167249b87459 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62dd2fb Change license tag to conform with SPDX