+ $query =~ s/^(\w+):// or badcfg "invalid archive-query method \`$query'";
+ my $proto = $1;
+ my $data = $'; #';
+ { no strict qw(refs); &{"${method}_${proto}"}($proto,$data); }
+}
+
+sub archive_query_madison ($$) {
+ my ($proto,$data) = @_;
+ die unless $proto eq 'madison';
+ $rmad{$package} ||= cmdoutput
+ qw(rmadison -asource),"-s$isuite","-u$data",$package;
+ my $rmad = $rmad{$package};
+ return madison_parse($rmad);
+}
+
+sub archive_query_sshdakls ($$) {
+ my ($proto,$data) = @_;
+ $data =~ s/:.*// or badcfg "invalid sshdakls method string \`$data'";
+ my $dakls = cmdoutput
+ access_cfg('ssh'), $data, qw(dak ls -asource),"-s$isuite",$package;
+ return madison_parse($dakls);
+}
+
+sub canonicalise_suite_sshdakls ($$) {
+ my ($proto,$data) = @_;
+ $data =~ m/:/ or badcfg "invalid sshdakls method string \`$data'";
+ my @cmd =
+ (access_cfg('ssh'), $`,
+ "set -e; cd $';".
+ " if test -h $isuite; then readlink $isuite; exit 0; fi;".
+ " if test -d $isuite; then echo $isuite; exit 0; fi;".
+ " exit 1");
+ my $dakls = cmdoutput @cmd;
+ failedcmd @cmd unless $dakls =~ m/^\w/;
+ return $dakls;
+}
+
+sub madison_parse ($) {
+ my ($rmad) = @_;
+ my @out;
+ foreach my $l (split /\n/, $rmad) {
+ $l =~ m{^ \s*( [^ \t|]+ )\s* \|
+ \s*( [^ \t|]+ )\s* \|
+ \s*( [^ \t|/]+ )(?:/([^ \t|/]+))? \s* \|
+ \s*( [^ \t|]+ )\s* }x or die "$rmad $?";
+ $1 eq $package or die "$rmad $package ?";
+ my $vsn = $2;
+ my $newsuite = $3;
+ my $component;
+ if (defined $4) {
+ $component = $4;
+ } else {
+ $component = access_cfg('archive-query-default-component');
+ }
+ $5 eq 'source' or die "$rmad ?";
+ my $prefix = substr($package, 0, $package =~ m/^l/ ? 4 : 1);
+ my $subpath = "/pool/$component/$prefix/$package/${package}_$vsn.dsc";
+ push @out, [$vsn,$subpath,$newsuite];
+ }
+ return sort { -version_compare_string($a->[0],$b->[0]); } @out;
+}
+
+sub canonicalise_suite_madison ($$) {
+ my @r = archive_query_madison($_[0],$_[1]);
+ @r or fail
+ "unable to canonicalise suite using package $package".
+ " which does not appear to exist in suite $isuite;".
+ " --existing-package may help";
+ return $r[0][2];