+ ATTRS->error and die $!;
+ close ATTRS;
+ }
+ print NATTRS "debian/changelog merge=$driver\n" or die $!;
+ close NATTRS;
+
+ set_local_git_config "$cb.name", 'debian/changelog merge driver';
+ set_local_git_config "$cb.driver", 'dpkg-mergechangelogs -m %O %A %B %A';
+
+ rename "$attrs.new", "$attrs" or die "$attrs: $!";
+}
+
+sub setup_useremail (;$) {
+ my ($always) = @_;
+ return unless $always || access_cfg_bool(1, 'setup-useremail');
+
+ my $setup = sub {
+ my ($k, $envvar) = @_;
+ my $v = access_cfg("user-$k", 'RETURN-UNDEF') // $ENV{$envvar};
+ return unless defined $v;
+ set_local_git_config "user.$k", $v;
+ };
+
+ $setup->('email', 'DEBEMAIL');
+ $setup->('name', 'DEBFULLNAME');
+}
+
+sub ensure_setup_existing_tree () {
+ my $k = "remote.$remotename.skipdefaultupdate";
+ my $c = git_get_config $k;
+ return if defined $c;
+ set_local_git_config $k, 'true';
+}
+
+sub open_main_gitattrs () {
+ confess 'internal error no maindir' unless defined $maindir;
+ my $gai = new IO::File "$maindir_gitcommon/info/attributes"
+ or $!==ENOENT
+ or die "open $maindir_gitcommon/info/attributes: $!";
+ return $gai;
+}
+
+sub is_gitattrs_setup () {
+ my $gai = open_main_gitattrs();
+ return 0 unless $gai;
+ while (<$gai>) {
+ return 1 if m{^\[attr\]dgit-defuse-attrs\s};
+ }
+ $gai->error and die $!;
+ return 0;
+}
+
+sub setup_gitattrs (;$) {
+ my ($always) = @_;
+ return unless $always || access_cfg_bool(1, 'setup-gitattributes');
+
+ if (is_gitattrs_setup()) {
+ progress <<END;
+[attr]dgit-defuse-attrs already found in .git/info/attributes
+ not doing further gitattributes setup
+END
+ return;
+ }
+ my $af = "$maindir_gitcommon/info/attributes";
+ ensuredir "$maindir_gitcommon/info";
+ open GAO, "> $af.new" or die $!;
+ print GAO <<END or die $!;
+* dgit-defuse-attrs
+[attr]dgit-defuse-attrs $negate_harmful_gitattrs
+# ^ see GITATTRIBUTES in dgit(7) and dgit setup-new-tree in dgit(1)
+END
+ my $gai = open_main_gitattrs();
+ if ($gai) {
+ while (<$gai>) {
+ chomp;
+ print GAO $_, "\n" or die $!;
+ }
+ $gai->error and die $!;
+ }
+ close GAO or die $!;
+ rename "$af.new", "$af" or die "install $af: $!";
+}
+
+sub setup_new_tree () {
+ setup_mergechangelogs();
+ setup_useremail();
+ setup_gitattrs();
+}
+
+sub check_gitattrs ($$) {
+ my ($treeish, $what) = @_;
+
+ return if is_gitattrs_setup;
+
+ local $/="\0";
+ my @cmd = (@git, qw(ls-tree -lrz --), "${treeish}:");
+ debugcmd "|",@cmd;
+ my $gafl = new IO::File;
+ open $gafl, "-|", @cmd or die $!;
+ while (<$gafl>) {
+ chomp or die;
+ s/^\d+\s+\w+\s+\w+\s+(\d+)\t// or die;
+ next if $1 == 0;
+ next unless m{(?:^|/)\.gitattributes$};
+
+ # oh dear, found one
+ print STDERR <<END;
+dgit: warning: $what contains .gitattributes
+dgit: .gitattributes have not been defused. Recommended: dgit setup-new-tree.
+END
+ close $gafl;
+ return;
+ }
+ # tree contains no .gitattributes files
+ $?=0; $!=0; close $gafl or failedcmd @cmd;
+}
+
+
+sub multisuite_suite_child ($$$) {
+ my ($tsuite, $merginputs, $fn) = @_;
+ # in child, sets things up, calls $fn->(), and returns undef
+ # in parent, returns canonical suite name for $tsuite
+ my $canonsuitefh = IO::File::new_tmpfile;
+ my $pid = fork // die $!;
+ if (!$pid) {
+ forkcheck_setup();
+ $isuite = $tsuite;
+ $us .= " [$isuite]";
+ $debugprefix .= " ";
+ progress "fetching $tsuite...";
+ canonicalise_suite();
+ print $canonsuitefh $csuite, "\n" or die $!;
+ close $canonsuitefh or die $!;
+ $fn->();
+ return undef;
+ }
+ waitpid $pid,0 == $pid or die $!;
+ fail "failed to obtain $tsuite: ".waitstatusmsg() if $? && $?!=256*4;
+ seek $canonsuitefh,0,0 or die $!;
+ local $csuite = <$canonsuitefh>;
+ die $! unless defined $csuite && chomp $csuite;
+ if ($? == 256*4) {
+ printdebug "multisuite $tsuite missing\n";
+ return $csuite;
+ }
+ printdebug "multisuite $tsuite ok (canon=$csuite)\n";
+ push @$merginputs, {
+ Ref => lrref,
+ Info => $csuite,
+ };
+ return $csuite;
+}
+
+sub fork_for_multisuite ($) {
+ my ($before_fetch_merge) = @_;
+ # if nothing unusual, just returns ''
+ #
+ # if multisuite:
+ # returns 0 to caller in child, to do first of the specified suites
+ # in child, $csuite is not yet set
+ #
+ # returns 1 to caller in parent, to finish up anything needed after
+ # in parent, $csuite is set to canonicalised portmanteau
+
+ my $org_isuite = $isuite;
+ my @suites = split /\,/, $isuite;
+ return '' unless @suites > 1;
+ printdebug "fork_for_multisuite: @suites\n";
+
+ my @mergeinputs;
+
+ my $cbasesuite = multisuite_suite_child($suites[0], \@mergeinputs,
+ sub { });
+ return 0 unless defined $cbasesuite;
+
+ fail "package $package missing in (base suite) $cbasesuite"
+ unless @mergeinputs;
+
+ my @csuites = ($cbasesuite);
+
+ $before_fetch_merge->();
+
+ foreach my $tsuite (@suites[1..$#suites]) {
+ $tsuite =~ s/^-/$cbasesuite-/;
+ my $csubsuite = multisuite_suite_child($tsuite, \@mergeinputs,
+ sub {
+ @end = ();
+ fetch();
+ exit 0;
+ });
+ # xxx collecte the ref here
+
+ $csubsuite =~ s/^\Q$cbasesuite\E-/-/;
+ push @csuites, $csubsuite;
+ }
+
+ foreach my $mi (@mergeinputs) {
+ my $ref = git_get_ref $mi->{Ref};
+ die "$mi->{Ref} ?" unless length $ref;
+ $mi->{Commit} = $ref;
+ }
+
+ $csuite = join ",", @csuites;
+
+ my $previous = git_get_ref lrref;
+ if ($previous) {
+ unshift @mergeinputs, {
+ Commit => $previous,
+ Info => "local combined tracking branch",
+ Warning =>
+ "archive seems to have rewound: local tracking branch is ahead!",
+ };
+ }
+
+ foreach my $ix (0..$#mergeinputs) {
+ $mergeinputs[$ix]{Index} = $ix;
+ }
+
+ @mergeinputs = sort {
+ -version_compare(mergeinfo_version $a,
+ mergeinfo_version $b) # highest version first
+ or
+ $a->{Index} <=> $b->{Index}; # earliest in spec first
+ } @mergeinputs;
+
+ my @needed;
+
+ NEEDED:
+ foreach my $mi (@mergeinputs) {
+ printdebug "multisuite merge check $mi->{Info}\n";
+ foreach my $previous (@needed) {
+ next unless is_fast_fwd $mi->{Commit}, $previous->{Commit};
+ printdebug "multisuite merge un-needed $previous->{Info}\n";
+ next NEEDED;
+ }
+ push @needed, $mi;
+ printdebug "multisuite merge this-needed\n";
+ $mi->{Character} = '+';