+$o{'timestamp'}= must_param('timestamp', "^([1-9]\\d{1,20})\$");
+my $now= time; defined $now or die $!;
+fail("clock skew") if $o{'timestamp'} >= $now;
+
+die if $o{'ocean'} =~ m/\=/;
+die if $o{'island'} =~ m/\=/;
+
+my $indatafh= upload('data');
+defined $indatafh or fail("data is not a file");
+my $datafile= must_param('data',"^(deduped\\.tsv\\.gz)\$");
+
+my $mcontent= MIME::Entity->build(To => 'yarrg-commod-updates',
+ Type => 'multipart/mixed',
+ Boundary => '=',
+ Charset => 'utf-8');
+
+get_our_version(\%o, 'server');
+foreach my $cs (qw(client server)) {
+ $o{"${cs}spec"}= join ' ', map { $o{$cs.$_} } qw(name version fixes);
+}
+
+foreach my $vn (sort keys %o) {
+ my $mpart= MIME::Entity->build(Top => 0,
+ Type => 'text/plain',
+ Charset => 'utf-8',
+ Disposition => 'attachment',
+ Filename => $vn,
+ Data => $o{$vn});
+ $mcontent->add_part($mpart);
+}
+
+my $gunzchild= open(GZ, "-|"); defined $gunzchild or die $!;
+if (!$gunzchild) {
+ open STDIN, "<&=", $indatafh or die $!;
+ exec 'gunzip'; die $!;
+}
+
+sub bad_data ($) { fail("bad data: line $.: $_[0]"); }
+
+our %done;
+
+while (<GZ>) {
+ !m/\P{IsPrint}/ or die bad_data('nonprinting char(s)');
+ !m/\\/ or bad_data('data contains backslashes');
+ my @v= split /\t/;
+ @v==6 or bad_data('wrong number of fields');
+ my ($commod,$stall) = @v;
+ defined $commods{$commod} or bad_data("unknown commodity \`$commod'");
+ $stall =~ m/^\p{IsUpper}|^[0-9]/ or bad_data("stall not capitalised");
+ !exists $done{$commod,$stall} or bad_data("repeated data");
+ $done{$commod,$stall}= 1;
+ foreach my $i (2..5) {
+ my $f= $v[$i];
+ $f =~ m/^(|0|[1-9][0-9]{0,5}|\>1000)$/ or bad_data("bad field $i");
+ ($i % 2) or ($f !~ m/\>/) or bad_data("> in field $i price");
+ }
+}
+GZ->error and die $!;
+$?=0; close GZ; $? and fail("gunzip for check failed code $?");
+
+my $mdatafile= MIME::Entity->build(Top => 0,
+ Type => 'application/octet-stream',
+ Disposition => 'attachment',
+ Encoding => 'base64',
+ Filename => 'deduped.tsv.gz',
+ Path => $datafile);
+$mcontent->add_part($mdatafile);
+
+open M, "|/usr/sbin/sendmail -t -oi -oee -odb"
+ or fail("fork sendmail failed! ($!)");
+$mcontent->print(\*M);
+
+M->error and fail("write sendmail failed! ($!)");
+$?=0; close M; $? and fail("sendmail failed code $?");
+
+print header(-type=>'text/plain', -charset=>'us-ascii'),
+ "OK\n"
+ or die $!;