length($spec->{Date})==18 or die "partial date specified, not supported\n";
+fixme check foreign base branch for unwanted topbloke files
+
my $newbranch = "$spec->{Email}\@$spec->{Domain}/$spec->{Date}/$spec->{Nick}";
$newbranch = run_git_1line(qw(check-ref-format --print), $newbranch);