summaryrefslogtreecommitdiff
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#!/usr/bin/perl -w
# dgit
# Integration between git and Debian-style archives
#
# Copyright (C)2013-2015 Ian Jackson
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;

use Debian::Dgit;
setup_sigwarn();

use IO::Handle;
use Data::Dumper;
use LWP::UserAgent;
use Dpkg::Control::Hash;
use File::Path;
use File::Temp qw(tempdir);
use File::Basename;
use Dpkg::Version;
use POSIX;
use IPC::Open2;
use Digest::SHA;
use Digest::MD5;

use Debian::Dgit;

our $our_version = 'UNRELEASED'; ###substituted###

our @rpushprotovsn_support = qw(3 2);
our $protovsn;

our $isuite = 'unstable';
our $idistro;
our $package;
our @ropts;

our $sign = 1;
our $dryrun_level = 0;
our $changesfile;
our $buildproductsdir = '..';
our $new_package = 0;
our $ignoredirty = 0;
our $rmonerror = 1;
our @deliberatelies;
our %previously;
our $existing_package = 'dpkg';
our $cleanmode;
our $changes_since_version;
our $rmchanges;
our $quilt_mode;
our $quilt_modes_re = 'linear|smash|auto|nofix|nocheck';
our $we_are_responder;
our $initiator_tempdir;

our %format_ok = map { $_=>1 } ("1.0","3.0 (native)","3.0 (quilt)");

our $suite_re = '[-+.0-9a-z]+';
our $cleanmode_re = 'dpkg-source(?:-d)?|git|git-ff|check|none';

our (@git) = qw(git);
our (@dget) = qw(dget);
our (@curl) = qw(curl -f);
our (@dput) = qw(dput);
our (@debsign) = qw(debsign);
our (@gpg) = qw(gpg);
our (@sbuild) = qw(sbuild);
our (@ssh) = 'ssh';
our (@dgit) = qw(dgit);
our (@dpkgbuildpackage) = qw(dpkg-buildpackage -i\.git/ -I.git);
our (@dpkgsource) = qw(dpkg-source -i\.git/ -I.git);
our (@dpkggenchanges) = qw(dpkg-genchanges);
our (@mergechanges) = qw(mergechanges -f);
our (@changesopts) = ('');

our %opts_opt_map = ('dget' => \@dget, # accept for compatibility
		     'curl' => \@curl,
		     'dput' => \@dput,
		     'debsign' => \@debsign,
                     'gpg' => \@gpg,
                     'sbuild' => \@sbuild,
                     'ssh' => \@ssh,
                     'dgit' => \@dgit,
                     'git' => \@git,
                     'dpkg-source' => \@dpkgsource,
                     'dpkg-buildpackage' => \@dpkgbuildpackage,
                     'dpkg-genchanges' => \@dpkggenchanges,
                     'ch' => \@changesopts,
                     'mergechanges' => \@mergechanges);

our %opts_opt_cmdonly = ('gpg' => 1, 'git' => 1);
our %opts_cfg_insertpos = map {
    $_,
    scalar @{ $opts_opt_map{$_} }
} keys %opts_opt_map;

sub finalise_opts_opts();

our $keyid;

autoflush STDOUT 1;

our $supplementary_message = '';

END {
    local ($@, $?);
    print STDERR "! $_\n" foreach $supplementary_message =~ m/^.+$/mg;
}

our $remotename = 'dgit';
our @ourdscfield = qw(Dgit Vcs-Dgit-Master);
our $csuite;
our $instead_distro;

sub lbranch () { return "$branchprefix/$csuite"; }
my $lbranch_re = '^refs/heads/'.$branchprefix.'/([^/.]+)$';
sub lref () { return "refs/heads/".lbranch(); }
sub lrref () { return "refs/remotes/$remotename/".server_branch($csuite); }
sub rrref () { return server_ref($csuite); }

sub lrfetchrefs () { return "refs/dgit-fetch/$csuite"; }

sub stripepoch ($) {
    my ($vsn) = @_;
    $vsn =~ s/^\d+\://;
    return $vsn;
}

sub srcfn ($$) {
    my ($vsn,$sfx) = @_;
    return "${package}_".(stripepoch $vsn).$sfx
}

sub dscfn ($) {
    my ($vsn) = @_;
    return srcfn($vsn,".dsc");
}

sub changespat ($;$) {
    my ($vsn, $arch) = @_;
    return "${package}_".(stripepoch $vsn)."_".($arch//'*').".changes";
}

our $us = 'dgit';
initdebug('');

our @end;
END { 
    local ($?);
    foreach my $f (@end) {
	eval { $f->(); };
	print STDERR "$us: cleanup: $@" if length $@;
    }
};

sub badcfg { print STDERR "$us: invalid configuration: @_\n"; exit 12; }

sub no_such_package () {
    print STDERR "$us: package $package does not exist in suite $isuite\n";
    exit 4;
}

sub fetchspec () {
    local $csuite = '*';
    return  "+".rrref().":".lrref();
}

sub changedir ($) {
    my ($newdir) = @_;
    printdebug "CD $newdir\n";
    chdir $newdir or die "chdir: $newdir: $!";
}

sub deliberately ($) {
    my ($enquiry) = @_;
    return !!grep { $_ eq "--deliberately-$enquiry" } @deliberatelies;
}

sub deliberately_not_fast_forward () {
    foreach (qw(not-fast-forward fresh-repo)) {
	return 1 if deliberately($_) || deliberately("TEST-dgit-only-$_");
    }
}

#---------- remote protocol support, common ----------

# remote push initiator/responder protocol:
#  $ dgit remote-push-build-host <n-rargs> <rargs>... <push-args>...
#  where <rargs> is <push-host-dir> <supported-proto-vsn>,... ...
#  < dgit-remote-push-ready <actual-proto-vsn>
#
#  > file parsed-changelog
#  [indicates that output of dpkg-parsechangelog follows]
#  > data-block NBYTES
#  > [NBYTES bytes of data (no newline)]
#  [maybe some more blocks]
#  > data-end
#
#  > file dsc
#  [etc]
#
#  > file changes
#  [etc]
#
#  > param head HEAD
#
#  > want signed-tag
#  [indicates that signed tag is wanted]
#  < data-block NBYTES
#  < [NBYTES bytes of data (no newline)]
#  [maybe some more blocks]
#  < data-end
#  < files-end
#
#  > want signed-dsc-changes
#  < data-block NBYTES    [transfer of signed dsc]
#  [etc]
#  < data-block NBYTES    [transfer of signed changes]
#  [etc]
#  < files-end
#
#  > complete

our $i_child_pid;

sub i_child_report () {
    # Sees if our child has died, and reap it if so.  Returns a string
    # describing how it died if it failed, or undef otherwise.
    return undef unless $i_child_pid;
    my $got = waitpid $i_child_pid, WNOHANG;
    return undef if $got <= 0;
    die unless $got == $i_child_pid;
    $i_child_pid = undef;
    return undef unless $?;
    return "build host child ".waitstatusmsg();
}

sub badproto ($$) {
    my ($fh, $m) = @_;
    fail "connection lost: $!" if $fh->error;
    fail "protocol violation; $m not expected";
}

sub badproto_badread ($$) {
    my ($fh, $wh) = @_;
    fail "connection lost: $!" if $!;
    my $report = i_child_report();
    fail $report if defined $report;
    badproto $fh, "eof (reading $wh)";
}

sub protocol_expect (&$) {
    my ($match, $fh) = @_;
    local $_;
    $_ = <$fh>;
    defined && chomp or badproto_badread $fh, "protocol message";
    if (wantarray) {
	my @r = &$match;
	return @r if @r;
    } else {
	my $r = &$match;
	return $r if $r;
    }
    badproto $fh, "\`$_'";
}

sub protocol_send_file ($$) {
    my ($fh, $ourfn) = @_;
    open PF, "<", $ourfn or die "$ourfn: $!";
    for (;;) {
	my $d;
	my $got = read PF, $d, 65536;
	die "$ourfn: $!" unless defined $got;
	last if !$got;
	print $fh "data-block ".length($d)."\n" or die $!;
	print $fh $d or die $!;
    }
    PF->error and die "$ourfn $!";
    print $fh "data-end\n" or die $!;
    close PF;
}

sub protocol_read_bytes ($$) {
    my ($fh, $nbytes) = @_;
    $nbytes =~ m/^[1-9]\d{0,5}$|^0$/ or badproto \*RO, "bad byte count";
    my $d;
    my $got = read $fh, $d, $nbytes;
    $got==$nbytes or badproto_badread $fh, "data block";
    return $d;
}

sub protocol_receive_file ($$) {
    my ($fh, $ourfn) = @_;
    printdebug "() $ourfn\n";
    open PF, ">", $ourfn or die "$ourfn: $!";
    for (;;) {
	my ($y,$l) = protocol_expect {
	    m/^data-block (.*)$/ ? (1,$1) :
	    m/^data-end$/ ? (0,) :
	    ();
	} $fh;
	last unless $y;
	my $d = protocol_read_bytes $fh, $l;
	print PF $d or die $!;
    }
    close PF or die $!;
}

#---------- remote protocol support, responder ----------

sub responder_send_command ($) {
    my ($command) = @_;
    return unless $we_are_responder;
    # called even without $we_are_responder
    printdebug ">> $command\n";
    print PO $command, "\n" or die $!;
}    

sub responder_send_file ($$) {
    my ($keyword, $ourfn) = @_;
    return unless $we_are_responder;
    printdebug "]] $keyword $ourfn\n";
    responder_send_command "file $keyword";
    protocol_send_file \*PO, $ourfn;
}

sub responder_receive_files ($@) {
    my ($keyword, @ourfns) = @_;
    die unless $we_are_responder;
    printdebug "[[ $keyword @ourfns\n";
    responder_send_command "want $keyword";
    foreach my $fn (@ourfns) {
	protocol_receive_file \*PI, $fn;
    }
    printdebug "[[\$\n";
    protocol_expect { m/^files-end$/ } \*PI;
}

#---------- remote protocol support, initiator ----------

sub initiator_expect (&) {
    my ($match) = @_;
    protocol_expect { &$match } \*RO;
}

#---------- end remote code ----------

sub progress {
    if ($we_are_responder) {
	my $m = join '', @_;
	responder_send_command "progress ".length($m) or die $!;
	print PO $m or die $!;
    } else {
	print @_, "\n";
    }
}

our $ua;

sub url_get {
    if (!$ua) {
	$ua = LWP::UserAgent->new();
	$ua->env_proxy;
    }
    my $what = $_[$#_];
    progress "downloading $what...";
    my $r = $ua->get(@_) or die $!;
    return undef if $r->code == 404;
    $r->is_success or fail "failed to fetch $what: ".$r->status_line;
    return $r->decoded_content(charset => 'none');
}

our ($dscdata,$dscurl,$dsc,$dsc_checked,$skew_warning_vsn);

sub runcmd {
    debugcmd "+",@_;
    $!=0; $?=0;
    failedcmd @_ if system @_;
}

sub act_local () { return $dryrun_level <= 1; }
sub act_scary () { return !$dryrun_level; }

sub printdone {
    if (!$dryrun_level) {
	progress "dgit ok: @_";
    } else {
	progress "would be ok: @_ (but dry run only)";
    }
}

sub dryrun_report {
    printcmd(\*STDERR,$debugprefix."#",@_);
}

sub runcmd_ordryrun {
    if (act_scary()) {
	runcmd @_;
    } else {
	dryrun_report @_;
    }
}

sub runcmd_ordryrun_local {
    if (act_local()) {
	runcmd @_;
    } else {
	dryrun_report @_;
    }
}

sub shell_cmd {
    my ($first_shell, @cmd) = @_;
    return qw(sh -ec), $first_shell.'; exec "$@"', 'x', @cmd;
}

our $helpmsg = <<END;
main usages:
  dgit [dgit-opts] clone [dgit-opts] package [suite] [./dir|/dir]
  dgit [dgit-opts] fetch|pull [dgit-opts] [suite]
  dgit [dgit-opts] build [dpkg-buildpackage-opts]
  dgit [dgit-opts] sbuild [sbuild-opts]
  dgit [dgit-opts] push [dgit-opts] [suite]
  dgit [dgit-opts] rpush build-host:build-dir ...
important dgit options:
  -k<keyid>           sign tag and package with <keyid> instead of default
  --dry-run -n        do not change anything, but go through the motions
  --damp-run -L       like --dry-run but make local changes, without signing
  --new -N            allow introducing a new package
  --debug -D          increase debug level
  -c<name>=<value>    set git config option (used directly by dgit too)
END

our $later_warning_msg = <<END;
Perhaps the upload is stuck in incoming.  Using the version from git.
END

sub badusage {
    print STDERR "$us: @_\n", $helpmsg or die $!;
    exit 8;
}

sub nextarg {
    @ARGV or badusage "too few arguments";
    return scalar shift @ARGV;
}

sub cmd_help () {
    print $helpmsg or die $!;
    exit 0;
}

our $td = $ENV{DGIT_TEST_DUMMY_DIR} || "DGIT_TEST_DUMMY_DIR-unset";

our %defcfg = ('dgit.default.distro' => 'debian',
	       'dgit.default.username' => '',
	       'dgit.default.archive-query-default-component' => 'main',
	       'dgit.default.ssh' => 'ssh',
	       'dgit.default.archive-query' => 'madison:',
	       'dgit.default.sshpsql-dbname' => 'service=projectb',
	       'dgit-distro.debian.archive-query' => 'ftpmasterapi:',
	       'dgit-distro.debian.git-check' => 'url',
	       'dgit-distro.debian.git-check-suffix' => '/info/refs',
	       'dgit-distro.debian.new-private-pushers' => 't',
	       'dgit-distro.debian/push.git-url' => '',
	       'dgit-distro.debian/push.git-host' => 'push.dgit.debian.org',
	       'dgit-distro.debian/push.git-user-force' => 'dgit',
	       'dgit-distro.debian/push.git-proto' => 'git+ssh://',
	       'dgit-distro.debian/push.git-path' => '/dgit/debian/repos',
	       'dgit-distro.debian/push.git-create' => 'true',
	       'dgit-distro.debian/push.git-check' => 'ssh-cmd',
 'dgit-distro.debian.archive-query-url', 'https://api.ftp-master.debian.org/',
# 'dgit-distro.debian.archive-query-tls-key',
#    '/etc/ssl/certs/%HOST%.pem:/etc/dgit/%HOST%.pem',
# ^ this does not work because curl is broken nowadays
# Fixing #790093 properly will involve providing providing the key
# in some pacagke and maybe updating these paths.
#
# 'dgit-distro.debian.archive-query-tls-curl-args',
#   '--ca-path=/etc/ssl/ca-debian',
# ^ this is a workaround but works (only) on DSA-administered machines
	       'dgit-distro.debian.git-url' => 'https://git.dgit.debian.org',
	       'dgit-distro.debian.git-url-suffix' => '',
	       'dgit-distro.debian.upload-host' => 'ftp-master', # for dput
	       'dgit-distro.debian.mirror' => 'http://ftp.debian.org/debian/',
 'dgit-distro.debian.backports-quirk' => '(squeeze)-backports*',
 'dgit-distro.debian-backports.mirror' => 'http://backports.debian.org/debian-backports/',
	       'dgit-distro.ubuntu.git-check' => 'false',
 'dgit-distro.ubuntu.mirror' => 'http://archive.ubuntu.com/ubuntu',
	       'dgit-distro.test-dummy.ssh' => "$td/ssh",
	       'dgit-distro.test-dummy.username' => "alice",
	       'dgit-distro.test-dummy.git-check' => "ssh-cmd",
	       'dgit-distro.test-dummy.git-create' => "ssh-cmd",
	       'dgit-distro.test-dummy.git-url' => "$td/git",
	       'dgit-distro.test-dummy.git-host' => "git",
	       'dgit-distro.test-dummy.git-path' => "$td/git",
	       'dgit-distro.test-dummy.archive-query' => "ftpmasterapi:",
	       'dgit-distro.test-dummy.archive-query-url' => "file://$td/aq/",
	       'dgit-distro.test-dummy.mirror' => "file://$td/mirror/",
	       'dgit-distro.test-dummy.upload-host' => 'test-dummy',
               );

our %gitcfg;

sub git_slurp_config () {
    local ($debuglevel) = $debuglevel-2;
    local $/="\0";

    my @cmd = (@git, qw(config -z --get-regexp .*));
    debugcmd "|",@cmd;

    open GITS, "-|", @cmd or failedcmd @cmd;
    while (<GITS>) {
	chomp or die;
	printdebug "=> ", (messagequote $_), "\n";
	m/\n/ or die "$_ ?";
	push @{ $gitcfg{$`} }, $'; #';
    }
    $!=0; $?=0;
    close GITS
	or ($!==0 && $?==256)
	or failedcmd @cmd;
}

sub git_get_config ($) {
    my ($c) = @_;
    my $l = $gitcfg{$c};
    printdebug"C $c ".(defined $l ? messagequote "'$l'" : "undef")."\n"
	if $debuglevel >= 4;
    $l or return undef;
    @$l==1 or badcfg "multiple values for $c" if @$l > 1;
    return $l->[0];
}

sub cfg {
    foreach my $c (@_) {
	return undef if $c =~ /RETURN-UNDEF/;
	my $v = git_get_config($c);
	return $v if defined $v;
	my $dv = $defcfg{$c};
	return $dv if defined $dv;
    }
    badcfg "need value for one of: @_\n".
	"$us: distro or suite appears not to be (properly) supported";
}

sub access_basedistro () {
    if (defined $idistro) {
	return $idistro;
    } else {	
	return cfg("dgit-suite.$isuite.distro",
		   "dgit.default.distro");
    }
}

sub access_quirk () {
    # returns (quirk name, distro to use instead or undef, quirk-specific info)
    my $basedistro = access_basedistro();
    my $backports_quirk = cfg("dgit-distro.$basedistro.backports-quirk",
			      'RETURN-UNDEF');
    if (defined $backports_quirk) {
	my $re = $backports_quirk;
	$re =~ s/[^-0-9a-z_\%*()]/\\$&/ig;
	$re =~ s/\*/.*/g;
	$re =~ s/\%/([-0-9a-z_]+)/
	    or $re =~ m/[()]/ or badcfg "backports-quirk needs \% or ( )";
	if ($isuite =~ m/^$re$/) {
	    return ('backports',"$basedistro-backports",$1);
	}
    }
    return ('none',undef);
}

our $access_forpush;

sub parse_cfg_bool ($$$) {
    my ($what,$def,$v) = @_;
    $v //= $def;
    return
	$v =~ m/^[ty1]/ ? 1 :
	$v =~ m/^[fn0]/ ? 0 :
	badcfg "$what needs t (true, y, 1) or f (false, n, 0) not \`$v'";
}	

sub access_forpush_config () {
    my $d = access_basedistro();

    return 1 if
	$new_package &&
	parse_cfg_bool('new-private-pushers', 0,
		       cfg("dgit-distro.$d.new-private-pushers",
			   'RETURN-UNDEF'));

    my $v = cfg("dgit-distro.$d.readonly", 'RETURN-UNDEF');
    $v //= 'a';
    return
	$v =~ m/^[ty1]/ ? 0 : # force readonly,    forpush = 0
	$v =~ m/^[fn0]/ ? 1 : # force nonreadonly, forpush = 1
	$v =~ m/^[a]/  ? '' : # auto,              forpush = ''
	badcfg "readonly needs t (true, y, 1) or f (false, n, 0) or a (auto)";
}

sub access_forpush () {
    $access_forpush //= access_forpush_config();
    return $access_forpush;
}

sub pushing () {
    die "$access_forpush ?" if ($access_forpush // 1) ne 1;
    badcfg "pushing but distro is configured readonly"
	if access_forpush_config() eq '0';
    $access_forpush = 1;
    $supplementary_message = <<'END' unless $we_are_responder;
Push failed, before we got started.
You can retry the push, after fixing the problem, if you like.
END
    finalise_opts_opts();
}

sub notpushing () {
    finalise_opts_opts();
}

sub supplementary_message ($) {
    my ($msg) = @_;
    if (!$we_are_responder) {
	$supplementary_message = $msg;
	return;
    } elsif ($protovsn >= 3) {
	responder_send_command "supplementary-message ".length($msg)
	    or die $!;
	print PO $msg or die $!;
    }
}

sub access_distros () {
    # Returns list of distros to try, in order
    #
    # We want to try:
    #    0. `instead of' distro name(s) we have been pointed to
    #    1. the access_quirk distro, if any
    #    2a. the user's specified distro, or failing that  } basedistro
    #    2b. the distro calculated from the suite          }
    my @l = access_basedistro();

    my (undef,$quirkdistro) = access_quirk();
    unshift @l, $quirkdistro;
    unshift @l, $instead_distro;
    @l = grep { defined } @l;

    if (access_forpush()) {
	@l = map { ("$_/push", $_) } @l;
    }
    @l;
}

sub access_cfg_cfgs (@) {
    my (@keys) = @_;
    my @cfgs;
    # The nesting of these loops determines the search order.  We put
    # the key loop on the outside so that we search all the distros
    # for each key, before going on to the next key.  That means that
    # if access_cfg is called with a more specific, and then a less
    # specific, key, an earlier distro can override the less specific
    # without necessarily overriding any more specific keys.  (If the
    # distro wants to override the more specific keys it can simply do
    # so; whereas if we did the loop the other way around, it would be
    # impossible to for an earlier distro to override a less specific
    # key but not the more specific ones without restating the unknown
    # values of the more specific keys.
    my @realkeys;
    my @rundef;
    # We have to deal with RETURN-UNDEF specially, so that we don't
    # terminate the search prematurely.
    foreach (@keys) {
	if (m/RETURN-UNDEF/) { push @rundef, $_; last; }
	push @realkeys, $_
    }
    foreach my $d (access_distros()) {
	push @cfgs, map { "dgit-distro.$d.$_" } @realkeys;
    }
    push @cfgs, map { "dgit.default.$_" } @realkeys;
    push @cfgs, @rundef;
    return @cfgs;
}

sub access_cfg (@) {
    my (@keys) = @_;
    my (@cfgs) = access_cfg_cfgs(@keys);
    my $value = cfg(@cfgs);
    return $value;
}

sub access_cfg_bool ($$) {
    my ($def, @keys) = @_;
    parse_cfg_bool($keys[0], $def, access_cfg(@keys, 'RETURN-UNDEF'));
}

sub string_to_ssh ($) {
    my ($spec) = @_;
    if ($spec =~ m/\s/) {
	return qw(sh -ec), 'exec '.$spec.' "$@"', 'x';
    } else {
	return ($spec);
    }
}

sub access_cfg_ssh () {
    my $gitssh = access_cfg('ssh', 'RETURN-UNDEF');
    if (!defined $gitssh) {
	return @ssh;
    } else {
	return string_to_ssh $gitssh;
    }
}

sub access_runeinfo ($) {
    my ($info) = @_;
    return ": dgit ".access_basedistro()." $info ;";
}

sub access_someuserhost ($) {
    my ($some) = @_;
    my $user = access_cfg("$some-user-force", 'RETURN-UNDEF');
    defined($user) && length($user) or
	$user = access_cfg("$some-user",'username');
    my $host = access_cfg("$some-host");
    return length($user) ? "$user\@$host" : $host;
}

sub access_gituserhost () {
    return access_someuserhost('git');
}

sub access_giturl (;$) {
    my ($optional) = @_;
    my $url = access_cfg('git-url','RETURN-UNDEF');
    my $suffix;
    if (!length $url) {
	my $proto = access_cfg('git-proto', 'RETURN-UNDEF');
	return undef unless defined $proto;
	$url =
	    $proto.
	    access_gituserhost().
	    access_cfg('git-path');
    } else {
	$suffix = access_cfg('git-url-suffix','RETURN-UNDEF');
    }
    $suffix //= '.git';
    return "$url/$package$suffix";
}	       

sub parsecontrolfh ($$;$) {
    my ($fh, $desc, $allowsigned) = @_;
    our $dpkgcontrolhash_noissigned;
    my $c;
    for (;;) {
	my %opts = ('name' => $desc);
	$opts{allow_pgp}= $allowsigned || !$dpkgcontrolhash_noissigned;
	$c = Dpkg::Control::Hash->new(%opts);
	$c->parse($fh,$desc) or die "parsing of $desc failed";
	last if $allowsigned;
	last if $dpkgcontrolhash_noissigned;
	my $issigned= $c->get_option('is_pgp_signed');
	if (!defined $issigned) {
	    $dpkgcontrolhash_noissigned= 1;
	    seek $fh, 0,0 or die "seek $desc: $!";
	} elsif ($issigned) {
	    fail "control file $desc is (already) PGP-signed. ".
		" Note that dgit push needs to modify the .dsc and then".
		" do the signature itself";
	} else {
	    last;
	}
    }
    return $c;
}

sub parsecontrol {
    my ($file, $desc) = @_;
    my $fh = new IO::Handle;
    open $fh, '<', $file or die "$file: $!";
    my $c = parsecontrolfh($fh,$desc);
    $fh->error and die $!;
    close $fh;
    return $c;
}

sub getfield ($$) {
    my ($dctrl,$field) = @_;
    my $v = $dctrl->{$field};
    return $v if defined $v;
    fail "missing field $field in ".$v->get_option('name');
}

sub parsechangelog {
    my $c = Dpkg::Control::Hash->new();
    my $p = new IO::Handle;
    my @cmd = (qw(dpkg-parsechangelog), @_);
    open $p, '-|', @cmd or die $!;
    $c->parse($p);
    $?=0; $!=0; close $p or failedcmd @cmd;
    return $c;
}

sub must_getcwd () {
    my $d = getcwd();
    defined $d or fail "getcwd failed: $!";
    return $d;
}

our %rmad;

sub archive_query ($) {
    my ($method) = @_;
    my $query = access_cfg('archive-query','RETURN-UNDEF');
    $query =~ s/^(\w+):// or badcfg "invalid archive-query method \`$query'";
    my $proto = $1;
    my $data = $'; #';
    { no strict qw(refs); &{"${method}_${proto}"}($proto,$data); }
}

sub pool_dsc_subpath ($$) {
    my ($vsn,$component) = @_; # $package is implict arg
    my $prefix = substr($package, 0, $package =~ m/^l/ ? 4 : 1);
    return "/pool/$component/$prefix/$package/".dscfn($vsn);
}

#---------- `ftpmasterapi' archive query method (nascent) ----------

sub archive_api_query_cmd ($) {
    my ($subpath) = @_;
    my @cmd = qw(curl -sS);
    my $url = access_cfg('archive-query-url');
    if ($url =~ m#^https://([-.0-9a-z]+)/#) {
	my $host = $1;
	my $keys = access_cfg('archive-query-tls-key','RETURN-UNDEF') //'';
	foreach my $key (split /\:/, $keys) {
	    $key =~ s/\%HOST\%/$host/g;
	    if (!stat $key) {
		fail "for $url: stat $key: $!" unless $!==ENOENT;
		next;
	    }
	    fail "config requested specific TLS key but do not know".
		" how to get curl to use exactly that EE key ($key)";
#	    push @cmd, "--cacert", $key, "--capath", "/dev/enoent";
#           # Sadly the above line does not work because of changes
#           # to gnutls.   The real fix for #790093 may involve
#           # new curl options.
	    last;
	}
	# Fixing #790093 properly will involve providing a value
	# for this on clients.
	my $kargs = access_cfg('archive-query-tls-curl-ca-args','RETURN-UNDEF');
	push @cmd, split / /, $kargs if defined $kargs;
    }
    push @cmd, $url.$subpath;
    return @cmd;
}

sub api_query ($$) {
    use JSON;
    my ($data, $subpath) = @_;
    badcfg "ftpmasterapi archive query method takes no data part"
	if length $data;
    my @cmd = archive_api_query_cmd($subpath);
    my $json = cmdoutput @cmd;
    return decode_json($json);
}

sub canonicalise_suite_ftpmasterapi () {
    my ($proto,$data) = @_;
    my $suites = api_query($data, 'suites');
    my @matched;
    foreach my $entry (@$suites) {
	next unless grep { 
	    my $v = $entry->{$_};
	    defined $v && $v eq $isuite;
	} qw(codename name);
	push @matched, $entry;
    }
    fail "unknown suite $isuite" unless @matched;
    my $cn;
    eval {
	@matched==1 or die "multiple matches for suite $isuite\n";
	$cn = "$matched[0]{codename}";
	defined $cn or die "suite $isuite info has no codename\n";
	$cn =~ m/^$suite_re$/ or die "suite $isuite maps to bad codename\n";
    };
    die "bad ftpmaster api response: $@\n".Dumper(\@matched)
	if length $@;
    return $cn;
}

sub archive_query_ftpmasterapi () {
    my ($proto,$data) = @_;
    my $info = api_query($data, "dsc_in_suite/$isuite/$package");
    my @rows;
    my $digester = Digest::SHA->new(256);
    foreach my $entry (@$info) {
	eval {
	    my $vsn = "$entry->{version}";
	    my ($ok,$msg) = version_check $vsn;
	    die "bad version: $msg\n" unless $ok;
	    my $component = "$entry->{component}";
	    $component =~ m/^$component_re$/ or die "bad component";
	    my $filename = "$entry->{filename}";
	    $filename && $filename !~ m#[^-+:._~0-9a-zA-Z/]|^[/.]|/[/.]#
		or die "bad filename";
	    my $sha256sum = "$entry->{sha256sum}";
	    $sha256sum =~ m/^[0-9a-f]+$/ or die "bad sha256sum";
	    push @rows, [ $vsn, "/pool/$component/$filename",
			  $digester, $sha256sum ];
	};
	die "bad ftpmaster api response: $@\n".Dumper($entry)
	    if length $@;
    }
    @rows = sort { -version_compare($a->[0],$b->[0]) } @rows;
    return @rows;
}

#---------- `madison' archive query method ----------

sub archive_query_madison {
    return map { [ @$_[0..1] ] } madison_get_parse(@_);
}

sub madison_get_parse {
    my ($proto,$data) = @_;
    die unless $proto eq 'madison';
    if (!length $data) {
	$data= access_cfg('madison-distro','RETURN-UNDEF');
	$data //= access_basedistro();
    }
    $rmad{$proto,$data,$package} ||= cmdoutput
	qw(rmadison -asource),"-s$isuite","-u$data",$package;
    my $rmad = $rmad{$proto,$data,$package};

    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 ?";
	push @out, [$vsn,pool_dsc_subpath($vsn,$component),$newsuite];
    }
    return sort { -version_compare($a->[0],$b->[0]); } @out;
}

sub canonicalise_suite_madison {
    # madison canonicalises for us
    my @r = madison_get_parse(@_);
    @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];
}

#---------- `sshpsql' archive query method ----------

sub sshpsql ($$$) {
    my ($data,$runeinfo,$sql) = @_;
    if (!length $data) {
	$data= access_someuserhost('sshpsql').':'.
	    access_cfg('sshpsql-dbname');
    }
    $data =~ m/:/ or badcfg "invalid sshpsql method string \`$data'";
    my ($userhost,$dbname) = ($`,$'); #';
    my @rows;
    my @cmd = (access_cfg_ssh, $userhost,
	       access_runeinfo("ssh-psql $runeinfo").
	       " export LC_MESSAGES=C; export LC_CTYPE=C;".
	       " ".shellquote qw(psql -A), $dbname, qw(-c), $sql);
    debugcmd "|",@cmd;
    open P, "-|", @cmd or die $!;
    while (<P>) {
	chomp or die;
	printdebug(">|$_|\n");
	push @rows, $_;
    }
    $!=0; $?=0; close P or failedcmd @cmd;
    @rows or die;
    my $nrows = pop @rows;
    $nrows =~ s/^\((\d+) rows?\)$/$1/ or die "$nrows ?";
    @rows == $nrows+1 or die "$nrows ".(scalar @rows)." ?";
    @rows = map { [ split /\|/, $_ ] } @rows;
    my $ncols = scalar @{ shift @rows };
    die if grep { scalar @$_ != $ncols } @rows;
    return @rows;
}

sub sql_injection_check {
    foreach (@_) { die "$_ $& ?" if m{[^-+=:_.,/0-9a-zA-Z]}; }
}

sub archive_query_sshpsql ($$) {
    my ($proto,$data) = @_;
    sql_injection_check $isuite, $package;
    my @rows = sshpsql($data, "archive-query $isuite $package", <<END);
        SELECT source.version, component.name, files.filename, files.sha256sum
          FROM source
          JOIN src_associations ON source.id = src_associations.source
          JOIN suite ON suite.id = src_associations.suite
          JOIN dsc_files ON dsc_files.source = source.id
          JOIN files_archive_map ON files_archive_map.file_id = dsc_files.file
          JOIN component ON component.id = files_archive_map.component_id
          JOIN files ON files.id = dsc_files.file
         WHERE ( suite.suite_name='$isuite' OR suite.codename='$isuite' )
           AND source.source='$package'
           AND files.filename LIKE '%.dsc';
END
    @rows = sort { -version_compare($a->[0],$b->[0]) } @rows;
    my $digester = Digest::SHA->new(256);
    @rows = map {
	my ($vsn,$component,$filename,$sha256sum) = @$_;
	[ $vsn, "/pool/$component/$filename",$digester,$sha256sum ];
    } @rows;
    return @rows;
}

sub canonicalise_suite_sshpsql ($$) {
    my ($proto,$data) = @_;
    sql_injection_check $isuite;
    my @rows = sshpsql($data, "canonicalise-suite $isuite", <<END);
        SELECT suite.codename
          FROM suite where suite_name='$isuite' or codename='$isuite';
END
    @rows = map { $_->[0] } @rows;
    fail "unknown suite $isuite" unless @rows;
    die "ambiguous $isuite: @rows ?" if @rows>1;
    return $rows[0];
}

#---------- `dummycat' archive query method ----------

sub canonicalise_suite_dummycat ($$) {
    my ($proto,$data) = @_;
    my $dpath = "$data/suite.$isuite";
    if (!open C, "<", $dpath) {
	$!==ENOENT or die "$dpath: $!";
	printdebug "dummycat canonicalise_suite $isuite $dpath ENOENT\n";
	return $isuite;
    }
    $!=0; $_ = <C>;
    chomp or die "$dpath: $!";
    close C;
    printdebug "dummycat canonicalise_suite $isuite $dpath = $_\n";
    return $_;
}

sub archive_query_dummycat ($$) {
    my ($proto,$data) = @_;
    canonicalise_suite();
    my $dpath = "$data/package.$csuite.$package";
    if (!open C, "<", $dpath) {
	$!==ENOENT or die "$dpath: $!";
	printdebug "dummycat query $csuite $package $dpath ENOENT\n";
	return ();
    }
    my @rows;
    while (<C>) {
	next if m/^\#/;
	next unless m/\S/;
	die unless chomp;
	printdebug "dummycat query $csuite $package $dpath | $_\n";
	my @row = split /\s+/, $_;
	@row==2 or die "$dpath: $_ ?";
	push @rows, \@row;
    }
    C->error and die "$dpath: $!";
    close C;
    return sort { -version_compare($a->[0],$b->[0]); } @rows;
}

#---------- archive query entrypoints and rest of program ----------

sub canonicalise_suite () {
    return if defined $csuite;
    fail "cannot operate on $isuite suite" if $isuite eq 'UNRELEASED';
    $csuite = archive_query('canonicalise_suite');
    if ($isuite ne $csuite) {
	progress "canonical suite name for $isuite is $csuite";
    }
}

sub get_archive_dsc () {
    canonicalise_suite();
    my @vsns = archive_query('archive_query');
    foreach my $vinfo (@vsns) {
	my ($vsn,$subpath,$digester,$digest) = @$vinfo;
	$dscurl = access_cfg('mirror').$subpath;
	$dscdata = url_get($dscurl);
	if (!$dscdata) {
	    $skew_warning_vsn = $vsn if !defined $skew_warning_vsn;
	    next;
	}
	if ($digester) {
	    $digester->reset();
	    $digester->add($dscdata);
	    my $got = $digester->hexdigest();
	    $got eq $digest or
		fail "$dscurl has hash $got but".
		    " archive told us to expect $digest";
	}
	my $dscfh = new IO::File \$dscdata, '<' or die $!;
	printdebug Dumper($dscdata) if $debuglevel>1;
	$dsc = parsecontrolfh($dscfh,$dscurl,1);
	printdebug Dumper($dsc) if $debuglevel>1;
	my $fmt = getfield $dsc, 'Format';
	fail "unsupported source format $fmt, sorry" unless $format_ok{$fmt};
	$dsc_checked = !!$digester;
	return;
    }
    $dsc = undef;
}

sub check_for_git ();
sub check_for_git () {
    # returns 0 or 1
    my $how = access_cfg('git-check');
    if ($how eq 'ssh-cmd') {
	my @cmd =
	    (access_cfg_ssh, access_gituserhost(),
	     access_runeinfo("git-check $package").
	     " set -e; cd ".access_cfg('git-path').";".
	     " if test -d $package.git; then echo 1; else echo 0; fi");
	my $r= cmdoutput @cmd;
	if ($r =~ m/^divert (\w+)$/) {
	    my $divert=$1;
	    my ($usedistro,) = access_distros();
	    # NB that if we are pushing, $usedistro will be $distro/push
	    $instead_distro= cfg("dgit-distro.$usedistro.diverts.$divert");
	    $instead_distro =~ s{^/}{ access_basedistro()."/" }e;
	    progress "diverting to $divert (using config for $instead_distro)";
	    return check_for_git();
	}
	failedcmd @cmd unless $r =~ m/^[01]$/;
	return $r+0;
    } elsif ($how eq 'url') {
	my $prefix = access_cfg('git-check-url','git-url');
	my $suffix = access_cfg('git-check-suffix','git-suffix',
				'RETURN-UNDEF') // '.git';
	my $url = "$prefix/$package$suffix";
	my @cmd = (qw(curl -sS -I), $url);
	my $result = cmdoutput @cmd;
	$result =~ s/^\S+ 200 .*\n\r?\n//;
	# curl -sS -I with https_proxy prints
	# HTTP/1.0 200 Connection established
	$result =~ m/^\S+ (404|200) /s or
	    fail "unexpected results from git check query - ".
	        Dumper($prefix, $result);
	my $code = $1;
	if ($code eq '404') {
	    return 0;
	} elsif ($code eq '200') {
	    return 1;
	} else {
	    die;
	}
    } elsif ($how eq 'true') {
	return 1;
    } elsif ($how eq 'false') {
	return 0;
    } else {
	badcfg "unknown git-check \`$how'";
    }
}

sub create_remote_git_repo () {
    my $how = access_cfg('git-create');
    if ($how eq 'ssh-cmd') {
	runcmd_ordryrun
	    (access_cfg_ssh, access_gituserhost(),
	     access_runeinfo("git-create $package").
	     "set -e; cd ".access_cfg('git-path').";".
	     " cp -a _template $package.git");
    } elsif ($how eq 'true') {
	# nothing to do
    } else {
	badcfg "unknown git-create \`$how'";
    }
}

our ($dsc_hash,$lastpush_hash);

our $ud = '.git/dgit/unpack';

sub prep_ud () {
    rmtree($ud);
    mkpath '.git/dgit';
    mkdir $ud or die $!;
}

sub mktree_in_ud_here () {
    runcmd qw(git init -q);
    rmtree('.git/objects');
    symlink '../../../../objects','.git/objects' or die $!;
}

sub git_write_tree () {
    my $tree = cmdoutput @git, qw(write-tree);
    $tree =~ m/^\w+$/ or die "$tree ?";
    return $tree;
}

sub remove_stray_gits () {
    my @gitscmd = qw(find -name .git -prune -print0);
    debugcmd "|",@gitscmd;
    open GITS, "-|", @gitscmd or failedcmd @gitscmd;
    {
	local $/="\0";
	while (<GITS>) {
	    chomp or die;
	    print STDERR "$us: warning: removing from source package: ",
		(messagequote $_), "\n";
	    rmtree $_;
	}
    }
    $!=0; $?=0; close GITS or failedcmd @gitscmd;
}

sub mktree_in_ud_from_only_subdir () {
    # changes into the subdir
    my (@dirs) = <*/.>;
    die unless @dirs==1;
    $dirs[0] =~ m#^([^/]+)/\.$# or die;
    my $dir = $1;
    changedir $dir;

    remove_stray_gits();
    mktree_in_ud_here();
    my ($format, $fopts) = get_source_format();
    if (madformat($format)) {
	rmtree '.pc';
    }
    runcmd @git, qw(add -Af);
    my $tree=git_write_tree();
    return ($tree,$dir);
}

sub dsc_files_info () {
    foreach my $csumi (['Checksums-Sha256','Digest::SHA', 'new(256)'],
		       ['Checksums-Sha1',  'Digest::SHA', 'new(1)'],
		       ['Files',           'Digest::MD5', 'new()']) {
	my ($fname, $module, $method) = @$csumi;
	my $field = $dsc->{$fname};
	next unless defined $field;
	eval "use $module; 1;" or die $@;
	my @out;
	foreach (split /\n/, $field) {
	    next unless m/\S/;
	    m/^(\w+) (\d+) (\S+)$/ or
		fail "could not parse .dsc $fname line \`$_'";
	    my $digester = eval "$module"."->$method;" or die $@;
	    push @out, {
		Hash => $1,
		Bytes => $2,
		Filename => $3,
		Digester => $digester,
	    };
	}
	return @out;
    }
    fail "missing any supported Checksums-* or Files field in ".
	$dsc->get_option('name');
}

sub dsc_files () {
    map { $_->{Filename} } dsc_files_info();
}

sub is_orig_file ($;$) {
    local ($_) = $_[0];
    my $base = $_[1];
    m/\.orig(?:-\w+)?\.tar\.\w+$/ or return 0;
    defined $base or return 1;
    return $` eq $base;
}

sub make_commit ($) {
    my ($file) = @_;
    return cmdoutput @git, qw(hash-object -w -t commit), $file;
}

sub clogp_authline ($) {
    my ($clogp) = @_;
    my $author = getfield $clogp, 'Maintainer';
    $author =~ s#,.*##ms;
    my $date = cmdoutput qw(date), '+%s %z', qw(-d), getfield($clogp,'Date');
    my $authline = "$author $date";
    $authline =~ m/^[^<>]+ \<\S+\> \d+ [-+]\d+$/ or
	fail "unexpected commit author line format \`$authline'".
	" (was generated from changelog Maintainer field)";
    return $authline;
}

sub vendor_patches_distro ($$) {
    my ($checkdistro, $what) = @_;
    return unless defined $checkdistro;

    my $series = "debian/patches/\L$checkdistro\E.series";
    printdebug "checking for vendor-specific $series ($what)\n";

    if (!open SERIES, "<", $series) {
	die "$series $!" unless $!==ENOENT;
	return;
    }
    while (<SERIES>) {
	next unless m/\S/;
	next if m/^\s+\#/;

	print STDERR <<END;

Unfortunately, this source package uses a feature of dpkg-source where
the same source package unpacks to different source code on different
distros.  dgit cannot safely operate on such packages on affected
distros, because the meaning of source packages is not stable.

Please ask the distro/maintainer to remove the distro-specific series
files and use a different technique (if necessary, uploading actually
different packages, if different distros are supposed to have
different code).

END
	fail "Found active distro-specific series file for".
	    " $checkdistro ($what): $series, cannot continue";
    }
    die "$series $!" if SERIES->error;
    close SERIES;
}

sub check_for_vendor_patches () {
    # This dpkg-source feature doesn't seem to be documented anywhere!
    # But it can be found in the changelog (reformatted):

    #   commit  4fa01b70df1dc4458daee306cfa1f987b69da58c
    #   Author: Raphael Hertzog <hertzog@debian.org>
    #   Date: Sun  Oct  3  09:36:48  2010 +0200

    #   dpkg-source: correctly create .pc/.quilt_series with alternate
    #   series files
    #   
    #   If you have debian/patches/ubuntu.series and you were
    #   unpacking the source package on ubuntu, quilt was still
    #   directed to debian/patches/series instead of
    #   debian/patches/ubuntu.series.
    #   
    #   debian/changelog                        |    3 +++
    #   scripts/Dpkg/Source/Package/V3/quilt.pm |    4 +++-
    #   2 files changed, 6 insertions(+), 1 deletion(-)

    use Dpkg::Vendor;
    vendor_patches_distro($ENV{DEB_VENDOR}, "DEB_VENDOR");
    vendor_patches_distro(Dpkg::Vendor::get_current_vendor(),
			 "Dpkg::Vendor \`current vendor'");
    vendor_patches_distro(access_basedistro(),
			  "distro being accessed");
}

sub generate_commit_from_dsc () {
    prep_ud();
    changedir $ud;

    foreach my $fi (dsc_files_info()) {
	my $f = $fi->{Filename};
	die "$f ?" if $f =~ m#/|^\.|\.dsc$|\.tmp$#;

	link_ltarget "../../../$f", $f
	    or $!==&ENOENT
	    or die "$f $!";

	complete_file_from_dsc('.', $fi)
	    or next;

	if (is_orig_file($f)) {
	    link $f, "../../../../$f"
		or $!==&EEXIST
		or die "$f $!";
	}
    }

    my $dscfn = "$package.dsc";

    open D, ">", $dscfn or die "$dscfn: $!";
    print D $dscdata or die "$dscfn: $!";
    close D or die "$dscfn: $!";
    my @cmd = qw(dpkg-source);
    push @cmd, '--no-check' if $dsc_checked;
    push @cmd, qw(-x --), $dscfn;
    runcmd @cmd;

    my ($tree,$dir) = mktree_in_ud_from_only_subdir();
    check_for_vendor_patches() if madformat($dsc->{format});
    runcmd qw(sh -ec), 'dpkg-parsechangelog >../changelog.tmp';
    my $clogp = parsecontrol('../changelog.tmp',"commit's changelog");
    my $authline = clogp_authline $clogp;
    my $changes = getfield $clogp, 'Changes';
    open C, ">../commit.tmp" or die $!;
    print C <<END or die $!;
tree $tree
author $authline
committer $authline

$changes

# imported from the archive
END
    close C or die $!;
    my $outputhash = make_commit qw(../commit.tmp);
    my $cversion = getfield $clogp, 'Version';
    progress "synthesised git commit from .dsc $cversion";
    if ($lastpush_hash) {
	runcmd @git, qw(reset --hard), $lastpush_hash;
	runcmd qw(sh -ec), 'dpkg-parsechangelog >>../changelogold.tmp';
	my $oldclogp = parsecontrol('../changelogold.tmp','previous changelog');
	my $oversion = getfield $oldclogp, 'Version';
	my $vcmp =
	    version_compare($oversion, $cversion);
	if ($vcmp < 0) {
	    # git upload/ is earlier vsn than archive, use archive
	    open C, ">../commit2.tmp" or die $!;
	    print C <<END or die $!;
tree $tree
parent $lastpush_hash
parent $outputhash
author $authline
committer $authline

Record $package ($cversion) in archive suite $csuite
END
            $outputhash = make_commit qw(../commit2.tmp);
	} elsif ($vcmp > 0) {
	    print STDERR <<END or die $!;

Version actually in archive:    $cversion (older)
Last allegedly pushed/uploaded: $oversion (newer or same)
$later_warning_msg
END
            $outputhash = $lastpush_hash;
        } else {
	    $outputhash = $lastpush_hash;
	}
    }
    changedir '../../../..';
    runcmd @git, qw(update-ref -m),"dgit fetch import $cversion",
            'DGIT_ARCHIVE', $outputhash;
    cmdoutput @git, qw(log -n2), $outputhash;
    # ... gives git a chance to complain if our commit is malformed
    rmtree($ud);
    return $outputhash;
}

sub complete_file_from_dsc ($$) {
    our ($dstdir, $fi) = @_;
    # Ensures that we have, in $dir, the file $fi, with the correct
    # contents.  (Downloading it from alongside $dscurl if necessary.)

    my $f = $fi->{Filename};
    my $tf = "$dstdir/$f";
    my $downloaded = 0;

    if (stat_exists $tf) {
	progress "using existing $f";
    } else {
	my $furl = $dscurl;
	$furl =~ s{/[^/]+$}{};
	$furl .= "/$f";
	die "$f ?" unless $f =~ m/^\Q${package}\E_/;
	die "$f ?" if $f =~ m#/#;
	runcmd_ordryrun_local @curl,qw(-o),$tf,'--',"$furl";
	return 0 if !act_local();
	$downloaded = 1;
    }

    open F, "<", "$tf" or die "$tf: $!";
    $fi->{Digester}->reset();
    $fi->{Digester}->addfile(*F);
    F->error and die $!;
    my $got = $fi->{Digester}->hexdigest();
    $got eq $fi->{Hash} or
	fail "file $f has hash $got but .dsc".
	    " demands hash $fi->{Hash} ".
	    ($downloaded ? "(got wrong file from archive!)"
	     : "(perhaps you should delete this file?)");

    return 1;
}

sub ensure_we_have_orig () {
    foreach my $fi (dsc_files_info()) {
	my $f = $fi->{Filename};
	next unless is_orig_file($f);
	complete_file_from_dsc('..', $fi)
	    or next;
    }
}

sub git_fetch_us () {
    my @specs = (fetchspec());
    push @specs,
        map { "+refs/$_/*:".lrfetchrefs."/$_/*" }
        qw(tags heads);
    runcmd_ordryrun_local @git, qw(fetch -p -n -q), access_giturl(), @specs;

    my %here;
    my $tagpat = debiantag('*',access_basedistro);

    git_for_each_ref("refs/tags/".$tagpat, sub {
	my ($objid,$objtype,$fullrefname,$reftail) = @_;
	printdebug "currently $fullrefname=$objid\n";
	$here{$fullrefname} = $objid;
    });
    git_for_each_ref(lrfetchrefs."/tags/".$tagpat, sub {
	my ($objid,$objtype,$fullrefname,$reftail) = @_;
	my $lref = "refs".substr($fullrefname, length lrfetchrefs);
	printdebug "offered $lref=$objid\n";
	if (!defined $here{$lref}) {
	    my @upd = (@git, qw(update-ref), $lref, $objid, '');
	    runcmd_ordryrun_local @upd;
	} elsif ($here{$lref} eq $objid) {
	} else {
	    print STDERR \
		"Not updateting $lref from $here{$lref} to $objid.\n";
	}
    });
}

sub fetch_from_archive () {
    # ensures that lrref() is what is actually in the archive,
    #  one way or another
    get_archive_dsc();

    if ($dsc) {
	foreach my $field (@ourdscfield) {
	    $dsc_hash = $dsc->{$field};
	    last if defined $dsc_hash;
	}
	if (defined $dsc_hash) {
	    $dsc_hash =~ m/\w+/ or fail "invalid hash in .dsc \`$dsc_hash'";
	    $dsc_hash = $&;
	    progress "last upload to archive specified git hash";
	} else {
	    progress "last upload to archive has NO git hash";
	}
    } else {
	progress "no version available from the archive";
    }

    $lastpush_hash = git_get_ref(lrref());
    printdebug "previous reference hash=$lastpush_hash\n";
    my $hash;
    if (defined $dsc_hash) {
	fail "missing remote git history even though dsc has hash -".
	    " could not find ref ".lrref().
	    " (should have been fetched from ".access_giturl()."#".rrref().")"
	    unless $lastpush_hash;
	$hash = $dsc_hash;
	ensure_we_have_orig();
	if ($dsc_hash eq $lastpush_hash) {
	} elsif (is_fast_fwd($dsc_hash,$lastpush_hash)) {
	    print STDERR <<END or die $!;

Git commit in archive is behind the last version allegedly pushed/uploaded.
Commit referred to by archive:  $dsc_hash
Last allegedly pushed/uploaded: $lastpush_hash
$later_warning_msg
END
	    $hash = $lastpush_hash;
	} else {
	    fail "git head (".lrref()."=$lastpush_hash) is not a ".
		"descendant of archive's .dsc hash ($dsc_hash)";
	}
    } elsif ($dsc) {
	$hash = generate_commit_from_dsc();
    } elsif ($lastpush_hash) {
	# only in git, not in the archive yet
	$hash = $lastpush_hash;
	print STDERR <<END or die $!;

Package not found in the archive, but has allegedly been pushed using dgit.
$later_warning_msg
END
    } else {
	printdebug "nothing found!\n";
	if (defined $skew_warning_vsn) {
	    print STDERR <<END or die $!;

Warning: relevant archive skew detected.
Archive allegedly contains $skew_warning_vsn
But we were not able to obtain any version from the archive or git.

END
	}
	return 0;
    }
    printdebug "current hash=$hash\n";
    if ($lastpush_hash) {
	fail "not fast forward on last upload branch!".
	    " (archive's version left in DGIT_ARCHIVE)"
	    unless is_fast_fwd($lastpush_hash, $hash);
    }
    if (defined $skew_warning_vsn) {
	mkpath '.git/dgit';
	printdebug "SKEW CHECK WANT $skew_warning_vsn\n";
	my $clogf = ".git/dgit/changelog.tmp";
	runcmd shell_cmd "exec >$clogf",
	    @git, qw(cat-file blob), "$hash:debian/changelog";
	my $gotclogp = parsechangelog("-l$clogf");
	my $got_vsn = getfield $gotclogp, 'Version';
	printdebug "SKEW CHECK GOT $got_vsn\n";
	if (version_compare($got_vsn, $skew_warning_vsn) < 0) {
	    print STDERR <<END or die $!;

Warning: archive skew detected.  Using the available version:
Archive allegedly contains    $skew_warning_vsn
We were able to obtain only   $got_vsn

END
	}
    }
    if ($lastpush_hash ne $hash) {
	my @upd_cmd = (@git, qw(update-ref -m), 'dgit fetch', lrref(), $hash);
	if (act_local()) {
	    cmdoutput @upd_cmd;
	} else {
	    dryrun_report @upd_cmd;
	}
    }
    return 1;
}

sub set_local_git_config ($$) {
    my ($k, $v) = @_;
    runcmd @git, qw(config), $k, $v;
}

sub setup_mergechangelogs (;$) {
    my ($always) = @_;
    return unless $always || access_cfg_bool(1, 'setup-mergechangelogs');

    my $driver = 'dpkg-mergechangelogs';
    my $cb = "merge.$driver";
    my $attrs = '.git/info/attributes';
    ensuredir '.git/info';

    open NATTRS, ">", "$attrs.new" or die "$attrs.new $!";
    if (!open ATTRS, "<", $attrs) {
	$!==ENOENT or die "$attrs: $!";
    } else {
	while (<ATTRS>) {
	    chomp;
	    next if m{^debian/changelog\s};
	    print NATTRS $_, "\n" or die $!;
	}
	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 setup_new_tree () {
    setup_mergechangelogs();
    setup_useremail();
}

sub clone ($) {
    my ($dstdir) = @_;
    canonicalise_suite();
    badusage "dry run makes no sense with clone" unless act_local();
    my $hasgit = check_for_git();
    mkdir $dstdir or fail "create \`$dstdir': $!";
    changedir $dstdir;
    runcmd @git, qw(init -q);
    my $giturl = access_giturl(1);
    if (defined $giturl) {
	set_local_git_config "remote.$remotename.fetch", fetchspec();
	open H, "> .git/HEAD" or die $!;
	print H "ref: ".lref()."\n" or die $!;
	close H or die $!;
	runcmd @git, qw(remote add), 'origin', $giturl;
    }
    if ($hasgit) {
	progress "fetching existing git history";
	git_fetch_us();
	runcmd_ordryrun_local @git, qw(fetch origin);
    } else {
	progress "starting new git history";
    }
    fetch_from_archive() or no_such_package;
    my $vcsgiturl = $dsc->{'Vcs-Git'};
    if (length $vcsgiturl) {
	$vcsgiturl =~ s/\s+-b\s+\S+//g;
	runcmd @git, qw(remote add vcs-git), $vcsgiturl;
    }
    setup_new_tree();
    runcmd @git, qw(reset --hard), lrref();
    printdone "ready for work in $dstdir";
}

sub fetch () {
    if (check_for_git()) {
	git_fetch_us();
    }
    fetch_from_archive() or no_such_package();
    printdone "fetched into ".lrref();
}

sub pull () {
    fetch();
    runcmd_ordryrun_local @git, qw(merge -m),"Merge from $csuite [dgit]",
        lrref();
    printdone "fetched to ".lrref()." and merged into HEAD";
}

sub check_not_dirty () {
    foreach my $f (qw(local-options local-patch-header)) {
	if (stat_exists "debian/source/$f") {
	    fail "git tree contains debian/source/$f";
	}
    }

    return if $ignoredirty;

    my @cmd = (@git, qw(diff --quiet HEAD));
    debugcmd "+",@cmd;
    $!=0; $?=0; system @cmd;
    return if !$! && !$?;
    if (!$! && $?==256) {
	fail "working tree is dirty (does not match HEAD)";
    } else {
	failedcmd @cmd;
    }
}

sub commit_admin ($) {
    my ($m) = @_;
    progress "$m";
    runcmd_ordryrun_local @git, qw(commit -m), $m;
}

sub commit_quilty_patch () {
    my $output = cmdoutput @git, qw(status --porcelain);
    my %adds;
    foreach my $l (split /\n/, $output) {
	next unless $l =~ m/\S/;
	if ($l =~ m{^(?:\?\?| M) (.pc|debian/patches)}) {
	    $adds{$1}++;
	}
    }
    delete $adds{'.pc'}; # if there wasn't one before, don't add it
    if (!%adds) {
	progress "nothing quilty to commit, ok.";
	return;
    }
    my @adds = map { s/[][*?\\]/\\$&/g; $_; } sort keys %adds;
    runcmd_ordryrun_local @git, qw(add -f), @adds;
    commit_admin "Commit Debian 3.0 (quilt) metadata";
}

sub get_source_format () {
    my %options;
    if (open F, "debian/source/options") {
	while (<F>) {
	    next if m/^\s*\#/;
	    next unless m/\S/;
	    s/\s+$//; # ignore missing final newline
	    if (m/\s*\#\s*/) {
		my ($k, $v) = ($`, $'); #');
		$v =~ s/^"(.*)"$/$1/;
		$options{$k} = $v;
	    } else {
		$options{$_} = 1;
	    }
	}
	F->error and die $!;
	close F;
    } else {
	die $! unless $!==&ENOENT;
    }

    if (!open F, "debian/source/format") {
	die $! unless $!==&ENOENT;
	return '';
    }
    $_ = <F>;
    F->error and die $!;
    chomp;
    return ($_, \%options);
}

sub madformat ($) {
    my ($format) = @_;
    return 0 unless $format eq '3.0 (quilt)';
    if ($quilt_mode eq 'nocheck') {
	progress "Not doing any fixup of \`$format' due to --no-quilt-fixup";
	return 0;
    }
    progress "Format \`$format', checking/updating patch stack";
    return 1;
}

sub push_parse_changelog ($) {
    my ($clogpfn) = @_;

    my $clogp = Dpkg::Control::Hash->new();
    $clogp->load($clogpfn) or die;

    $package = getfield $clogp, 'Source';
    my $cversion = getfield $clogp, 'Version';
    my $tag = debiantag($cversion, access_basedistro);
    runcmd @git, qw(check-ref-format), $tag;

    my $dscfn = dscfn($cversion);

    return ($clogp, $cversion, $tag, $dscfn);
}

sub push_parse_dsc ($$$) {
    my ($dscfn,$dscfnwhat, $cversion) = @_;
    $dsc = parsecontrol($dscfn,$dscfnwhat);
    my $dversion = getfield $dsc, 'Version';
    my $dscpackage = getfield $dsc, 'Source';
    ($dscpackage eq $package && $dversion eq $cversion) or
	fail "$dscfn is for $dscpackage $dversion".
	    " but debian/changelog is for $package $cversion";
}

sub push_mktag ($$$$$$$) {
    my ($head,$clogp,$tag,
	$dscfn,
	$changesfile,$changesfilewhat,
	$tfn) = @_;

    $dsc->{$ourdscfield[0]} = $head;
    $dsc->save("$dscfn.tmp") or die $!;

    my $changes = parsecontrol($changesfile,$changesfilewhat);
    foreach my $field (qw(Source Distribution Version)) {
	$changes->{$field} eq $clogp->{$field} or
	    fail "changes field $field \`$changes->{$field}'".
	        " does not match changelog \`$clogp->{$field}'";
    }

    my $cversion = getfield $clogp, 'Version';
    my $clogsuite = getfield $clogp, 'Distribution';

    # We make the git tag by hand because (a) that makes it easier
    # to control the "tagger" (b) we can do remote signing
    my $authline = clogp_authline $clogp;
    my $delibs = join(" ", "",@deliberatelies);
    my $declaredistro = access_basedistro();
    open TO, '>', $tfn->('.tmp') or die $!;
    print TO <<END or die $!;
object $head
type commit
tag $tag
tagger $authline

$package release $cversion for $clogsuite ($csuite) [dgit]
[dgit distro=$declaredistro$delibs]
END
    foreach my $ref (sort keys %previously) {
		    print TO <<END or die $!;
[dgit previously:$ref=$previously{$ref}]
END
    }

    close TO or die $!;

    my $tagobjfn = $tfn->('.tmp');
    if ($sign) {
	if (!defined $keyid) {
	    $keyid = access_cfg('keyid','RETURN-UNDEF');
	}
        if (!defined $keyid) {
	    $keyid = getfield $clogp, 'Maintainer';
        }
	unlink $tfn->('.tmp.asc') or $!==&ENOENT or die $!;
	my @sign_cmd = (@gpg, qw(--detach-sign --armor));
	push @sign_cmd, qw(-u),$keyid if defined $keyid;
	push @sign_cmd, $tfn->('.tmp');
	runcmd_ordryrun @sign_cmd;
	if (act_scary()) {
	    $tagobjfn = $tfn->('.signed.tmp');
	    runcmd shell_cmd "exec >$tagobjfn", qw(cat --),
	        $tfn->('.tmp'), $tfn->('.tmp.asc');
	}
    }

    return ($tagobjfn);
}

sub sign_changes ($) {
    my ($changesfile) = @_;
    if ($sign) {
	my @debsign_cmd = @debsign;
	push @debsign_cmd, "-k$keyid" if defined $keyid;
	push @debsign_cmd, "-p$gpg[0]" if $gpg[0] ne 'gpg';
	push @debsign_cmd, $changesfile;
	runcmd_ordryrun @debsign_cmd;
    }
}

sub dopush ($) {
    my ($forceflag) = @_;
    printdebug "actually entering push\n";
    supplementary_message(<<'END');
Push failed, while preparing your push.
You can retry the push, after fixing the problem, if you like.
END
    prep_ud();

    access_giturl(); # check that success is vaguely likely

    my $clogpfn = ".git/dgit/changelog.822.tmp";
    runcmd shell_cmd "exec >$clogpfn", qw(dpkg-parsechangelog);

    responder_send_file('parsed-changelog', $clogpfn);

    my ($clogp, $cversion, $tag, $dscfn) =
	push_parse_changelog("$clogpfn");

    my $dscpath = "$buildproductsdir/$dscfn";
    stat_exists $dscpath or
	fail "looked for .dsc $dscfn, but $!;".
	    " maybe you forgot to build";

    responder_send_file('dsc', $dscpath);

    push_parse_dsc($dscpath, $dscfn, $cversion);

    my $format = getfield $dsc, 'Format';
    printdebug "format $format\n";
    if (madformat($format)) {
	commit_quilty_patch();
    }
    check_not_dirty();
    changedir $ud;
    progress "checking that $dscfn corresponds to HEAD";
    runcmd qw(dpkg-source -x --),
        $dscpath =~ m#^/# ? $dscpath : "../../../$dscpath";
    my ($tree,$dir) = mktree_in_ud_from_only_subdir();
    check_for_vendor_patches() if madformat($dsc->{format});
    changedir '../../../..';
    my $diffopt = $debuglevel>0 ? '--exit-code' : '--quiet';
    my @diffcmd = (@git, qw(diff), $diffopt, $tree);
    debugcmd "+",@diffcmd;
    $!=0; $?=0;
    my $r = system @diffcmd;
    if ($r) {
	if ($r==256) {
	    fail "$dscfn specifies a different tree to your HEAD commit;".
		" perhaps you forgot to build".
		($diffopt eq '--exit-code' ? "" :
		 " (run with -D to see full diff output)");
	} else {
	    failedcmd @diffcmd;
	}
    }
    my $head = git_rev_parse('HEAD');
    if (!$changesfile) {
	my $pat = changespat $cversion;
	my @cs = glob "$buildproductsdir/$pat";
	fail "failed to find unique changes file".
	    " (looked for $pat in $buildproductsdir);".
	    " perhaps you need to use dgit -C"
	    unless @cs==1;
	($changesfile) = @cs;
    } else {
	$changesfile = "$buildproductsdir/$changesfile";
    }

    responder_send_file('changes',$changesfile);
    responder_send_command("param head $head");
    responder_send_command("param csuite $csuite");

    if (deliberately_not_fast_forward) {
	git_for_each_ref(lrfetchrefs, sub {
	    my ($objid,$objtype,$lrfetchrefname,$reftail) = @_;
	    my $rrefname= substr($lrfetchrefname, length(lrfetchrefs) + 1);
	    responder_send_command("previously $rrefname=$objid");
	    $previously{$rrefname} = $objid;
	});
    }

    my $tfn = sub { ".git/dgit/tag$_[0]"; };
    my $tagobjfn;

    supplementary_message(<<'END');
Push failed, while signing the tag.
You can retry the push, after fixing the problem, if you like.
END
    # If we manage to sign but fail to record it anywhere, it's fine.
    if ($we_are_responder) {
	$tagobjfn = $tfn->('.signed.tmp');
	responder_receive_files('signed-tag', $tagobjfn);
    } else {
	$tagobjfn =
	    push_mktag($head,$clogp,$tag,
		       $dscpath,
		       $changesfile,$changesfile,
		       $tfn);
    }
    supplementary_message(<<'END');
Push failed, *after* signing the tag.
If you want to try again, you should use a new version number.
END

    my $tag_obj_hash = cmdoutput @git, qw(hash-object -w -t tag), $tagobjfn;
    runcmd_ordryrun @git, qw(verify-tag), $tag_obj_hash;
    runcmd_ordryrun_local @git, qw(update-ref), "refs/tags/$tag", $tag_obj_hash;

    supplementary_message(<<'END');
Push failed, while updating the remote git repository - see messages above.
If you want to try again, you should use a new version number.
END
    if (!check_for_git()) {
	create_remote_git_repo();
    }
    runcmd_ordryrun @git, qw(push),access_giturl(),
        $forceflag."HEAD:".rrref(), $forceflag."refs/tags/$tag";
    runcmd_ordryrun @git, qw(update-ref -m), 'dgit push', lrref(), 'HEAD';

    supplementary_message(<<'END');
Push failed, after updating the remote git repository.
If you want to try again, you must use a new version number.
END
    if ($we_are_responder) {
	my $dryrunsuffix = act_local() ? "" : ".tmp";
	responder_receive_files('signed-dsc-changes',
				"$dscpath$dryrunsuffix",
				"$changesfile$dryrunsuffix");
    } else {
	if (act_local()) {
	    rename "$dscpath.tmp",$dscpath or die "$dscfn $!";
	} else {
	    progress "[new .dsc left in $dscpath.tmp]";
	}
	sign_changes $changesfile;
    }

    supplementary_message(<<END);
Push failed, while uploading package(s) to the archive server.
You can retry the upload of exactly these same files with dput of:
  $changesfile
If that .changes file is broken, you will need to use a new version
number for your next attempt at the upload.
END
    my $host = access_cfg('upload-host','RETURN-UNDEF');
    my @hostarg = defined($host) ? ($host,) : ();
    runcmd_ordryrun @dput, @hostarg, $changesfile;
    printdone "pushed and uploaded $cversion";

    supplementary_message('');
    responder_send_command("complete");
}

sub cmd_clone {
    parseopts();
    notpushing();
    my $dstdir;
    badusage "-p is not allowed with clone; specify as argument instead"
	if defined $package;
    if (@ARGV==1) {
	($package) = @ARGV;
    } elsif (@ARGV==2 && $ARGV[1] =~ m#^\w#) {
	($package,$isuite) = @ARGV;
    } elsif (@ARGV==2 && $ARGV[1] =~ m#^[./]#) {
	($package,$dstdir) = @ARGV;
    } elsif (@ARGV==3) {
	($package,$isuite,$dstdir) = @ARGV;
    } else {
	badusage "incorrect arguments to dgit clone";
    }
    $dstdir ||= "$package";

    if (stat_exists $dstdir) {
	fail "$dstdir already exists";
    }

    my $cwd_remove;
    if ($rmonerror && !$dryrun_level) {
	$cwd_remove= getcwd();
	unshift @end, sub { 
	    return unless defined $cwd_remove;
	    if (!chdir "$cwd_remove") {
		return if $!==&ENOENT;
		die "chdir $cwd_remove: $!";
	    }
	    if (stat $dstdir) {
		rmtree($dstdir) or die "remove $dstdir: $!\n";
	    } elsif (!grep { $! == $_ }
		     (ENOENT, ENOTDIR, EACCES, EPERM, ELOOP)) {
	    } else {
		print STDERR "check whether to remove $dstdir: $!\n";
	    }
	};
    }

    clone($dstdir);
    $cwd_remove = undef;
}

sub branchsuite () {
    my $branch = cmdoutput_errok @git, qw(symbolic-ref HEAD);
    if ($branch =~ m#$lbranch_re#o) {
	return $1;
    } else {
	return undef;
    }
}

sub fetchpullargs () {
    notpushing();
    if (!defined $package) {
	my $sourcep = parsecontrol('debian/control','debian/control');
	$package = getfield $sourcep, 'Source';
    }
    if (@ARGV==0) {
#	$isuite = branchsuite();  # this doesn't work because dak hates canons
	if (!$isuite) {
	    my $clogp = parsechangelog();
	    $isuite = getfield $clogp, 'Distribution';
	}
	canonicalise_suite();
	progress "fetching from suite $csuite";
    } elsif (@ARGV==1) {
	($isuite) = @ARGV;
	canonicalise_suite();
    } else {
	badusage "incorrect arguments to dgit fetch or dgit pull";
    }
}

sub cmd_fetch {
    parseopts();
    fetchpullargs();
    fetch();
}

sub cmd_pull {
    parseopts();
    fetchpullargs();
    pull();
}

sub cmd_push {
    parseopts();
    pushing();
    badusage "-p is not allowed with dgit push" if defined $package;
    check_not_dirty();
    my $clogp = parsechangelog();
    $package = getfield $clogp, 'Source';
    my $specsuite;
    if (@ARGV==0) {
    } elsif (@ARGV==1) {
	($specsuite) = (@ARGV);
    } else {
	badusage "incorrect arguments to dgit push";
    }
    $isuite = getfield $clogp, 'Distribution';
    if ($new_package) {
	local ($package) = $existing_package; # this is a hack
	canonicalise_suite();
    } else {
	canonicalise_suite();
    }
    if (defined $specsuite &&
	$specsuite ne $isuite &&
	$specsuite ne $csuite) {
	    fail "dgit push: changelog specifies $isuite ($csuite)".
	        " but command line specifies $specsuite";
    }
    supplementary_message(<<'END');
Push failed, while checking state of the archive.
You can retry the push, after fixing the problem, if you like.
END
    if (check_for_git()) {
	git_fetch_us();
    }
    my $forceflag = '';
    if (fetch_from_archive()) {
	if (is_fast_fwd(lrref(), 'HEAD')) {
	    # ok
	} elsif (deliberately_not_fast_forward) {
	    $forceflag = '+';
	} else {
	    fail "dgit push: HEAD is not a descendant".
	        " of the archive's version.\n".
		"dgit: To overwrite its contents,".
		" use git merge -s ours ".lrref().".\n".
		"dgit: To rewind history, if permitted by the archive,".
		" use --deliberately-not-fast-forward";
	}
    } else {
	$new_package or
	    fail "package appears to be new in this suite;".
	        " if this is intentional, use --new";
    }
    dopush($forceflag);
}

#---------- remote commands' implementation ----------

sub cmd_remote_push_build_host {
    my ($nrargs) = shift @ARGV;
    my (@rargs) = @ARGV[0..$nrargs-1];
    @ARGV = @ARGV[$nrargs..$#ARGV];
    die unless @rargs;
    my ($dir,$vsnwant) = @rargs;
    # vsnwant is a comma-separated list; we report which we have
    # chosen in our ready response (so other end can tell if they
    # offered several)
    $debugprefix = ' ';
    $we_are_responder = 1;
    $us .= " (build host)";

    pushing();

    open PI, "<&STDIN" or die $!;
    open STDIN, "/dev/null" or die $!;
    open PO, ">&STDOUT" or die $!;
    autoflush PO 1;
    open STDOUT, ">&STDERR" or die $!;
    autoflush STDOUT 1;

    $vsnwant //= 1;
    ($protovsn) = grep {
	$vsnwant =~ m{^(?:.*,)?$_(?:,.*)?$}
    } @rpushprotovsn_support;

    fail "build host has dgit rpush protocol versions ".
	(join ",", @rpushprotovsn_support).
        " but invocation host has $vsnwant"
	unless defined $protovsn;

    responder_send_command("dgit-remote-push-ready $protovsn");

    changedir $dir;
    &cmd_push;
}

sub cmd_remote_push_responder { cmd_remote_push_build_host(); }
# ... for compatibility with proto vsn.1 dgit (just so that user gets
#     a good error message)

our $i_tmp;

sub i_cleanup {
    local ($@, $?);
    my $report = i_child_report();
    if (defined $report) {
	printdebug "($report)\n";
    } elsif ($i_child_pid) {
	printdebug "(killing build host child $i_child_pid)\n";
	kill 15, $i_child_pid;
    }
    if (defined $i_tmp && !defined $initiator_tempdir) {
	changedir "/";
	eval { rmtree $i_tmp; };
    }
}

END { i_cleanup(); }

sub i_method {
    my ($base,$selector,@args) = @_;
    $selector =~ s/\-/_/g;
    { no strict qw(refs); &{"${base}_${selector}"}(@args); }
}

sub cmd_rpush {
    pushing();
    my $host = nextarg;
    my $dir;
    if ($host =~ m/^((?:[^][]|\[[^][]*\])*)\:/) {
	$host = $1;
	$dir = $'; #';
    } else {
	$dir = nextarg;
    }
    $dir =~ s{^-}{./-};
    my @rargs = ($dir);
    push @rargs, join ",", @rpushprotovsn_support;
    my @rdgit;
    push @rdgit, @dgit;
    push @rdgit, @ropts;
    push @rdgit, qw(remote-push-build-host), (scalar @rargs), @rargs;
    push @rdgit, @ARGV;
    my @cmd = (@ssh, $host, shellquote @rdgit);
    debugcmd "+",@cmd;

    if (defined $initiator_tempdir) {
	rmtree $initiator_tempdir;
	mkdir $initiator_tempdir, 0700 or die "$initiator_tempdir: $!";
	$i_tmp = $initiator_tempdir;
    } else {
	$i_tmp = tempdir();
    }
    $i_child_pid = open2(\*RO, \*RI, @cmd);
    changedir $i_tmp;
    ($protovsn) = initiator_expect { m/^dgit-remote-push-ready (\S+)/ };
    die "$protovsn ?" unless grep { $_ eq $protovsn } @rpushprotovsn_support;
    $supplementary_message = '' unless $protovsn >= 3;
    for (;;) {
	my ($icmd,$iargs) = initiator_expect {
	    m/^(\S+)(?: (.*))?$/;
	    ($1,$2);
	};
	i_method "i_resp", $icmd, $iargs;
    }
}

sub i_resp_progress ($) {
    my ($rhs) = @_;
    my $msg = protocol_read_bytes \*RO, $rhs;
    progress $msg;
}

sub i_resp_supplementary_message ($) {
    my ($rhs) = @_;
    $supplementary_message = protocol_read_bytes \*RO, $rhs;
}

sub i_resp_complete {
    my $pid = $i_child_pid;
    $i_child_pid = undef; # prevents killing some other process with same pid
    printdebug "waiting for build host child $pid...\n";
    my $got = waitpid $pid, 0;
    die $! unless $got == $pid;
    die "build host child failed $?" if $?;

    i_cleanup();
    printdebug "all done\n";
    exit 0;
}

sub i_resp_file ($) {
    my ($keyword) = @_;
    my $localname = i_method "i_localname", $keyword;
    my $localpath = "$i_tmp/$localname";
    stat_exists $localpath and
	badproto \*RO, "file $keyword ($localpath) twice";
    protocol_receive_file \*RO, $localpath;
    i_method "i_file", $keyword;
}

our %i_param;

sub i_resp_param ($) {
    $_[0] =~ m/^(\S+) (.*)$/ or badproto \*RO, "bad param spec";
    $i_param{$1} = $2;
}

sub i_resp_previously ($) {
    $_[0] =~ m#^(refs/tags/\S+)=(\w+)$#
	or badproto \*RO, "bad previously spec";
    my $r = system qw(git check-ref-format), $1;
    die "bad previously ref spec ($r)" if $r;
    $previously{$1} = $2;
}

our %i_wanted;

sub i_resp_want ($) {
    my ($keyword) = @_;
    die "$keyword ?" if $i_wanted{$keyword}++;
    my @localpaths = i_method "i_want", $keyword;
    printdebug "[[  $keyword @localpaths\n";
    foreach my $localpath (@localpaths) {
	protocol_send_file \*RI, $localpath;
    }
    print RI "files-end\n" or die $!;
}

our ($i_clogp, $i_version, $i_tag, $i_dscfn, $i_changesfn);

sub i_localname_parsed_changelog {
    return "remote-changelog.822";
}
sub i_file_parsed_changelog {
    ($i_clogp, $i_version, $i_tag, $i_dscfn) =
	push_parse_changelog "$i_tmp/remote-changelog.822";
    die if $i_dscfn =~ m#/|^\W#;
}

sub i_localname_dsc {
    defined $i_dscfn or badproto \*RO, "dsc (before parsed-changelog)";
    return $i_dscfn;
}
sub i_file_dsc { }

sub i_localname_changes {
    defined $i_dscfn or badproto \*RO, "dsc (before parsed-changelog)";
    $i_changesfn = $i_dscfn;
    $i_changesfn =~ s/\.dsc$/_dgit.changes/ or die;
    return $i_changesfn;
}
sub i_file_changes { }

sub i_want_signed_tag {
    printdebug Dumper(\%i_param, $i_dscfn);
    defined $i_param{'head'} && defined $i_dscfn && defined $i_clogp
	&& defined $i_param{'csuite'}
	or badproto \*RO, "premature desire for signed-tag";
    my $head = $i_param{'head'};
    die if $head =~ m/[^0-9a-f]/ || $head !~ m/^../;

    die unless $i_param{'csuite'} =~ m/^$suite_re$/;
    $csuite = $&;
    push_parse_dsc $i_dscfn, 'remote dsc', $i_version;

    my $tagobjfn =
	push_mktag $head, $i_clogp, $i_tag,
	    $i_dscfn,
	    $i_changesfn, 'remote changes',
	    sub { "tag$_[0]"; };

    return $tagobjfn;
}

sub i_want_signed_dsc_changes {
    rename "$i_dscfn.tmp","$i_dscfn" or die "$i_dscfn $!";
    sign_changes $i_changesfn;
    return ($i_dscfn, $i_changesfn);
}

#---------- building etc. ----------

our $version;
our $sourcechanges;
our $dscfn;

#----- `3.0 (quilt)' handling -----

our $fakeeditorenv = 'DGIT_FAKE_EDITOR_QUILT';

sub quiltify_dpkg_commit ($$$;$) {
    my ($patchname,$author,$msg, $xinfo) = @_;
    $xinfo //= '';

    mkpath '.git/dgit';
    my $descfn = ".git/dgit/quilt-description.tmp";
    open O, '>', $descfn or die "$descfn: $!";
    $msg =~ s/\s+$//g;
    $msg =~ s/\n/\n /g;
    $msg =~ s/^\s+$/ ./mg;
    print O <<END or die $!;
Description: $msg
Author: $author
$xinfo
---

END
    close O or die $!;

    {
	local $ENV{'EDITOR'} = cmdoutput qw(realpath --), $0;
	local $ENV{'VISUAL'} = $ENV{'EDITOR'};
	local $ENV{$fakeeditorenv} = cmdoutput qw(realpath --), $descfn;
	runcmd @dpkgsource, qw(--commit .), $patchname;
    }
}

sub quiltify_trees_differ ($$) {
    my ($x,$y) = @_;
    # returns 1 iff the two tree objects differ other than in debian/
    local $/=undef;
    my @cmd = (@git, qw(diff-tree --name-only -z), $x, $y);
    my $diffs= cmdoutput @cmd;
    foreach my $f (split /\0/, $diffs) {
	next if $f eq 'debian';
	return 1;
    }
    return 0;
}

sub quiltify_tree_sentinelfiles ($) {
    # lists the `sentinel' files present in the tree
    my ($x) = @_;
    my $r = cmdoutput @git, qw(ls-tree --name-only), $x,
        qw(-- debian/rules debian/control);
    $r =~ s/\n/,/g;
    return $r;
}

sub quiltify ($$) {
    my ($clogp,$target) = @_;

    # Quilt patchification algorithm
    #
    # We search backwards through the history of the main tree's HEAD
    # (T) looking for a start commit S whose tree object is identical
    # to to the patch tip tree (ie the tree corresponding to the
    # current dpkg-committed patch series).  For these purposes
    # `identical' disregards anything in debian/ - this wrinkle is
    # necessary because dpkg-source treates debian/ specially.
    #
    # We can only traverse edges where at most one of the ancestors'
    # trees differs (in changes outside in debian/).  And we cannot
    # handle edges which change .pc/ or debian/patches.  To avoid
    # going down a rathole we avoid traversing edges which introduce
    # debian/rules or debian/control.  And we set a limit on the
    # number of edges we are willing to look at.
    #
    # If we succeed, we walk forwards again.  For each traversed edge
    # PC (with P parent, C child) (starting with P=S and ending with
    # C=T) to we do this:
    #  - git checkout C
    #  - dpkg-source --commit with a patch name and message derived from C
    # After traversing PT, we git commit the changes which
    # should be contained within debian/patches.

    changedir '../fake';
    remove_stray_gits();
    mktree_in_ud_here();
    rmtree '.pc';
    runcmd @git, qw(add -Af .);
    my $oldtiptree=git_write_tree();
    changedir '../work';

    # The search for the path S..T is breadth-first.  We maintain a
    # todo list containing search nodes.  A search node identifies a
    # commit, and looks something like this:
    #  $p = {
    #      Commit => $git_commit_id,
    #      Child => $c,                          # or undef if P=T
    #      Whynot => $reason_edge_PC_unsuitable, # in @nots only
    #      Nontrivial => true iff $p..$c has relevant changes
    #  };

    my @todo;
    my @nots;
    my $sref_S;
    my $max_work=100;
    my %considered; # saves being exponential on some weird graphs

    my $t_sentinels = quiltify_tree_sentinelfiles $target;

    my $not = sub {
	my ($search,$whynot) = @_;
	printdebug " search NOT $search->{Commit} $whynot\n";
	$search->{Whynot} = $whynot;
	push @nots, $search;
	no warnings qw(exiting);
	next;
    };

    push @todo, {
	Commit => $target,
    };

    while (@todo) {
	my $c = shift @todo;
	next if $considered{$c->{Commit}}++;

	$not->($c, "maximum search space exceeded") if --$max_work <= 0;

	printdebug "quiltify investigate $c->{Commit}\n";

	# are we done?
	if (!quiltify_trees_differ $c->{Commit}, $oldtiptree) {
	    printdebug " search finished hooray!\n";
	    $sref_S = $c;
	    last;
	}

	if ($quilt_mode eq 'nofix') {
	    fail "quilt fixup required but quilt mode is \`nofix'\n".
		"HEAD commit $c->{Commit} differs from tree implied by ".
		" debian/patches (tree object $oldtiptree)";
	}
	if ($quilt_mode eq 'smash') {
	    printdebug " search quitting smash\n";
	    last;
	}

	my $c_sentinels = quiltify_tree_sentinelfiles $c->{Commit};
	$not->($c, "has $c_sentinels not $t_sentinels")
	    if $c_sentinels ne $t_sentinels;

	my $commitdata = cmdoutput @git, qw(cat-file commit), $c->{Commit};
	$commitdata =~ m/\n\n/;
	$commitdata =~ $`;
	my @parents = ($commitdata =~ m/^parent (\w+)$/gm);
	@parents = map { { Commit => $_, Child => $c } } @parents;

	$not->($c, "root commit") if !@parents;

	foreach my $p (@parents) {
	    $p->{Nontrivial}= quiltify_trees_differ $p->{Commit},$c->{Commit};
	}
	my $ndiffers = grep { $_->{Nontrivial} } @parents;
	$not->($c, "merge ($ndiffers nontrivial parents)") if $ndiffers > 1;

	foreach my $p (@parents) {
	    printdebug "considering C=$c->{Commit} P=$p->{Commit}\n";

	    my @cmd= (@git, qw(diff-tree -r --name-only),
		      $p->{Commit},$c->{Commit}, qw(-- debian/patches .pc));
	    my $patchstackchange = cmdoutput @cmd;
	    if (length $patchstackchange) {
		$patchstackchange =~ s/\n/,/g;
		$not->($p, "changed $patchstackchange");
	    }

	    printdebug " search queue P=$p->{Commit} ",
	        ($p->{Nontrivial} ? "NT" : "triv"),"\n";
	    push @todo, $p;
	}
    }

    if (!$sref_S) {
	printdebug "quiltify want to smash\n";

	my $abbrev = sub {
	    my $x = $_[0]{Commit};
	    $x =~ s/(.*?[0-9a-z]{8})[0-9a-z]*$/$1/;
	    return $x;
	};
	my $reportnot = sub {
	    my ($notp) = @_;
	    my $s = $abbrev->($notp);
	    my $c = $notp->{Child};
	    $s .= "..".$abbrev->($c) if $c;
	    $s .= ": ".$notp->{Whynot};
	    return $s;
	};
	if ($quilt_mode eq 'linear') {
	    print STDERR "$us: quilt fixup cannot be linear.  Stopped at:\n";
	    foreach my $notp (@nots) {
		print STDERR "$us:  ", $reportnot->($notp), "\n";
	    }
	    fail "quilt fixup naive history linearisation failed.\n".
 "Use dpkg-source --commit by hand; or, --quilt=smash for one ugly patch";
	} elsif ($quilt_mode eq 'smash') {
	} elsif ($quilt_mode eq 'auto') {
	    progress "quilt fixup cannot be linear, smashing...";
	} else {
	    die "$quilt_mode ?";
	}

	my $time = time;
	my $ncommits = 3;
	my $msg = cmdoutput @git, qw(log), "-n$ncommits";

	quiltify_dpkg_commit "auto-$version-$target-$time",
	    (getfield $clogp, 'Maintainer'),
	    "Automatically generated patch ($clogp->{Version})\n".
	    "Last (up to) $ncommits git changes, FYI:\n\n". $msg;
	return;
    }

    progress "quiltify linearisation planning successful, executing...";

    for (my $p = $sref_S;
	 my $c = $p->{Child};
	 $p = $p->{Child}) {
	printdebug "quiltify traverse $p->{Commit}..$c->{Commit}\n";
	next unless $p->{Nontrivial};

	my $cc = $c->{Commit};

	my $commitdata = cmdoutput @git, qw(cat-file commit), $cc;
	$commitdata =~ m/\n\n/ or die "$c ?";
	$commitdata = $`;
	my $msg = $'; #';
	$commitdata =~ m/^author (.*) \d+ [-+0-9]+$/m or die "$cc ?";
	my $author = $1;

	$msg =~ s/^(.*)\n*/$1\n/ or die "$cc $msg ?";

	my $title = $1;
	my $patchname = $title;
	$patchname =~ s/[.:]$//;
	$patchname =~ y/ A-Z/-a-z/;
	$patchname =~ y/-a-z0-9_.+=~//cd;
	$patchname =~ s/^\W/x-$&/;
	$patchname = substr($patchname,0,40);
	my $index;
	for ($index='';
	     stat "debian/patches/$patchname$index";
	     $index++) { }
	$!==ENOENT or die "$patchname$index $!";

	runcmd @git, qw(checkout -q), $cc;

	# We use the tip's changelog so that dpkg-source doesn't
	# produce complaining messages from dpkg-parsechangelog.  None
	# of the information dpkg-source gets from the changelog is
	# actually relevant - it gets put into the original message
	# which dpkg-source provides our stunt editor, and then
	# overwritten.
	runcmd @git, qw(checkout -q), $target, qw(debian/changelog);

	quiltify_dpkg_commit "$patchname$index", $author, $msg,
	    "X-Dgit-Generated: $clogp->{Version} $cc\n";

	runcmd @git, qw(checkout -q), $cc, qw(debian/changelog);
    }

    runcmd @git, qw(checkout -q master);
}

sub build_maybe_quilt_fixup () {
    my ($format,$fopts) = get_source_format;
    return unless madformat $format;
    # sigh

    check_for_vendor_patches();

    my $clogp = parsechangelog();
    my $headref = git_rev_parse('HEAD');

    prep_ud();
    changedir $ud;

    my $upstreamversion=$version;
    $upstreamversion =~ s/-[^-]*$//;

    if ($fopts->{'single-debian-patch'}) {
	quilt_fixup_singlepatch($clogp, $headref, $upstreamversion);
    } else {
	quilt_fixup_multipatch($clogp, $headref, $upstreamversion);
    }

    changedir '../../../..';
    runcmd_ordryrun_local
        @git, qw(pull --ff-only -q .git/dgit/unpack/work master);
}

sub quilt_fixup_mkwork ($) {
    my ($headref) = @_;

    mkdir "work" or die $!;
    changedir "work";
    mktree_in_ud_here();
    runcmd @git, qw(reset --hard), $headref;
}

sub quilt_fixup_linkorigs ($$) {
    my ($upstreamversion, $fn) = @_;
    # calls $fn->($leafname);

    foreach my $f (<../../../../*>) { #/){
	my $b=$f; $b =~ s{.*/}{};
	{
	    local ($debuglevel) = $debuglevel-1;
	    printdebug "QF linkorigs $b, $f ?\n";
	}
	next unless is_orig_file $b, srcfn $upstreamversion,'';
	printdebug "QF linkorigs $b, $f Y\n";
	link_ltarget $f, $b or die "$b $!";
        $fn->($b);
    }
}

sub quilt_fixup_delete_pc () {
    runcmd @git, qw(rm -rqf .pc);
    commit_admin "Commit removal of .pc (quilt series tracking data)";
}

sub quilt_fixup_singlepatch ($$$) {
    my ($clogp, $headref, $upstreamversion) = @_;

    progress "starting quiltify (single-debian-patch)";

    # dpkg-source --commit generates new patches even if
    # single-debian-patch is in debian/source/options.  In order to
    # get it to generate debian/patches/debian-changes, it is
    # necessary to build the source package.

    quilt_fixup_linkorigs($upstreamversion, sub { });
    quilt_fixup_mkwork($headref);

    rmtree("debian/patches");

    runcmd @dpkgsource, qw(-b .);
    chdir "..";
    runcmd @dpkgsource, qw(-x), (srcfn $version, ".dsc");
    rename srcfn("$upstreamversion", "/debian/patches"), 
           "work/debian/patches";

    chdir "work";
    commit_quilty_patch();

    
}

sub quilt_fixup_multipatch ($$$) {
    my ($clogp, $headref, $upstreamversion) = @_;

    progress "starting quiltify (multiple patches, $quilt_mode mode)";

    # Our objective is:
    #  - honour any existing .pc in case it has any strangeness
    #  - determine the git commit corresponding to the tip of
    #    the patch stack (if there is one)
    #  - if there is such a git commit, convert each subsequent
    #    git commit into a quilt patch with dpkg-source --commit
    #  - otherwise convert all the differences in the tree into
    #    a single git commit
    #
    # To do this we:

    # Our git tree doesn't necessarily contain .pc.  (Some versions of
    # dgit would include the .pc in the git tree.)  If there isn't
    # one, we need to generate one by unpacking the patches that we
    # have.
    #
    # We first look for a .pc in the git tree.  If there is one, we
    # will use it.  (This is not the normal case.)
    #
    # Otherwise need to regenerate .pc so that dpkg-source --commit
    # can work.  We do this as follows:
    #     1. Collect all relevant .orig from parent directory
    #     2. Generate a debian.tar.gz out of
    #         debian/{patches,rules,source/format,source/options}
    #     3. Generate a fake .dsc containing just these fields:
    #          Format Source Version Files
    #     4. Extract the fake .dsc
    #        Now the fake .dsc has a .pc directory.
    # (In fact we do this in every case, because in future we will
    # want to search for a good base commit for generating patches.)
    #
    # Then we can actually do the dpkg-source --commit
    #     1. Make a new working tree with the same object
    #        store as our main tree and check out the main
    #        tree's HEAD.
    #     2. Copy .pc from the fake's extraction, if necessary
    #     3. Run dpkg-source --commit
    #     4. If the result has changes to debian/, then
    #          - git-add them them
    #          - git-add .pc if we had a .pc in-tree
    #          - git-commit
    #     5. If we had a .pc in-tree, delete it, and git-commit
    #     6. Back in the main tree, fast forward to the new HEAD

    my $fakeversion="$upstreamversion-~~DGITFAKE";

    my $fakedsc=new IO::File 'fake.dsc', '>' or die $!;
    print $fakedsc <<END or die $!;
Format: 3.0 (quilt)
Source: $package
Version: $fakeversion
Files:
END

    my $dscaddfile=sub {
        my ($b) = @_;
        
	my $md = new Digest::MD5;

	my $fh = new IO::File $b, '<' or die "$b $!";
	stat $fh or die $!;
	my $size = -s _;

	$md->addfile($fh);
	print $fakedsc " ".$md->hexdigest." $size $b\n" or die $!;
    };

    quilt_fixup_linkorigs($upstreamversion, $dscaddfile);

    my @files=qw(debian/source/format debian/rules);
    foreach my $maybe (qw(debian/patches debian/source/options)) {
        next unless stat_exists "../../../$maybe";
        push @files, $maybe;
    }

    my $debtar= srcfn $fakeversion,'.debian.tar.gz';
    runcmd qw(env GZIP=-1 tar -zcf), "./$debtar", qw(-C ../../..), @files;

    $dscaddfile->($debtar);
    close $fakedsc or die $!;

    runcmd qw(sh -ec), 'exec dpkg-source --no-check -x fake.dsc >/dev/null';

    my $fakexdir= $package.'-'.(stripepoch $upstreamversion);
    rename $fakexdir, "fake" or die "$fakexdir $!";

    quilt_fixup_mkwork($headref);

    my $mustdeletepc=0;
    if (stat_exists ".pc") {
        -d _ or die;
	progress "Tree already contains .pc - will use it then delete it.";
        $mustdeletepc=1;
    } else {
        rename '../fake/.pc','.pc' or die $!;
    }

    quiltify($clogp,$headref);

    if (!open P, '>>', ".pc/applied-patches") {
	$!==&ENOENT or die $!;
    } else {
	close P;
    }

    commit_quilty_patch();

    if ($mustdeletepc) {
        quilt_fixup_delete_pc();
    }
}

sub quilt_fixup_editor () {
    my $descfn = $ENV{$fakeeditorenv};
    my $editing = $ARGV[$#ARGV];
    open I1, '<', $descfn or die "$descfn: $!";
    open I2, '<', $editing or die "$editing: $!";
    unlink $editing or die "$editing: $!";
    open O, '>', $editing or die "$editing: $!";
    while (<I1>) { print O or die $!; } I1->error and die $!;
    my $copying = 0;
    while (<I2>) {
	$copying ||= m/^\-\-\- /;
	next unless $copying;
	print O or die $!;
    }
    I2->error and die $!;
    close O or die $1;
    exit 0;
}

#----- other building -----

our $suppress_clean;

sub clean_tree () {
    return if $suppress_clean;
    if ($cleanmode eq 'dpkg-source') {
	runcmd_ordryrun_local @dpkgbuildpackage, qw(-T clean);
    } elsif ($cleanmode eq 'dpkg-source-d') {
	runcmd_ordryrun_local @dpkgbuildpackage, qw(-d -T clean);
    } elsif ($cleanmode eq 'git') {
	runcmd_ordryrun_local @git, qw(clean -xdf);
    } elsif ($cleanmode eq 'git-ff') {
	runcmd_ordryrun_local @git, qw(clean -xdff);
    } elsif ($cleanmode eq 'check') {
	my $leftovers = cmdoutput @git, qw(clean -xdn);
	if (length $leftovers) {
	    print STDERR $leftovers, "\n" or die $!;
	    fail "tree contains uncommitted files and --clean=check specified";
	}
    } elsif ($cleanmode eq 'none') {
    } else {
	die "$cleanmode ?";
    }
}

sub cmd_clean () {
    badusage "clean takes no additional arguments" if @ARGV;
    notpushing();
    clean_tree();
}

sub build_prep () {
    notpushing();
    badusage "-p is not allowed when building" if defined $package;
    check_not_dirty();
    clean_tree();
    my $clogp = parsechangelog();
    $isuite = getfield $clogp, 'Distribution';
    $package = getfield $clogp, 'Source';
    $version = getfield $clogp, 'Version';
    build_maybe_quilt_fixup();
    if ($rmchanges) {
	my $pat = changespat $version;
	foreach my $f (glob "$buildproductsdir/$pat") {
	    if (act_local()) {
		unlink $f or fail "remove old changes file $f: $!";
	    } else {
		progress "would remove $f";
	    }
	}
    }
}

sub changesopts_initial () {
    my @opts =@changesopts[1..$#changesopts];
}

sub changesopts_version () {
    if (!defined $changes_since_version) {
	my @vsns = archive_query('archive_query');
	my @quirk = access_quirk();
	if ($quirk[0] eq 'backports') {
	    local $isuite = $quirk[2];
	    local $csuite;
	    canonicalise_suite();
	    push @vsns, archive_query('archive_query');
	}
	if (@vsns) {
	    @vsns = map { $_->[0] } @vsns;
	    @vsns = sort { -version_compare($a, $b) } @vsns;
	    $changes_since_version = $vsns[0];
	    progress "changelog will contain changes since $vsns[0]";
	} else {
	    $changes_since_version = '_';
	    progress "package seems new, not specifying -v<version>";
	}
    }
    if ($changes_since_version ne '_') {
	return ("-v$changes_since_version");
    } else {
	return ();
    }
}

sub changesopts () {
    return (changesopts_initial(), changesopts_version());
}

sub massage_dbp_args ($;$) {
    my ($cmd,$xargs) = @_;
    if ($cleanmode eq 'dpkg-source') {
	$suppress_clean = 1;
	return;
    }
    debugcmd '#massaging#', @$cmd if $debuglevel>1;
    my @newcmd = shift @$cmd;
    # -nc has the side effect of specifying -b if nothing else specified
    push @newcmd, '-nc';
    # and some combinations of -S, -b, et al, are errors, rather than
    # later simply overriding earlier
    push @newcmd, '-F' unless grep { m/^-[bBASFgG]$/ } (@$cmd, @$xargs);
    push @newcmd, @$cmd;
    @$cmd = @newcmd;
}

sub cmd_build {
    my @dbp = (@dpkgbuildpackage, qw(-us -uc), changesopts_initial(), @ARGV);
    massage_dbp_args \@dbp;
    build_prep();
    push @dbp, changesopts_version();
    runcmd_ordryrun_local @dbp;
    printdone "build successful\n";
}

sub cmd_gbp_build {
    my @dbp = @dpkgbuildpackage;
    massage_dbp_args \@dbp, \@ARGV;

    my @cmd;
    if (length executable_on_path('git-buildpackage')) {
	@cmd = qw(git-buildpackage);
    } else {
	@cmd = qw(gbp buildpackage);
    }
    push @cmd, (qw(-us -uc --git-no-sign-tags), "--git-builder=@dbp");

    if ($cleanmode eq 'dpkg-source') {
	$suppress_clean = 1;
    } else {
	push @cmd, '--git-cleaner=true';
    }
    build_prep();
    unless (grep { m/^--git-debian-branch|^--git-ignore-branch/ } @ARGV) {
	canonicalise_suite();
	push @cmd, "--git-debian-branch=".lbranch();
    }
    push @cmd, changesopts();
    runcmd_ordryrun_local @cmd, @ARGV;
    printdone "build successful\n";
}
sub cmd_git_build { cmd_gbp_build(); } # compatibility with <= 1.0

sub build_source {
    if ($cleanmode =~ m/^dpkg-source/) {
	# dpkg-source will clean, so we shouldn't
	$suppress_clean = 1;
    }
    build_prep();
    $sourcechanges = changespat $version,'source';
    if (act_local()) {
	unlink "../$sourcechanges" or $!==ENOENT
	    or fail "remove $sourcechanges: $!";
    }
    $dscfn = dscfn($version);
    if ($cleanmode eq 'dpkg-source') {
	runcmd_ordryrun_local @dpkgbuildpackage, qw(-us -uc -S),
			       changesopts();
    } elsif ($cleanmode eq 'dpkg-source-d') {
	runcmd_ordryrun_local @dpkgbuildpackage, qw(-us -uc -S -d),
			       changesopts();
    } else {
	my $pwd = must_getcwd();
	my $leafdir = basename $pwd;
	changedir "..";
	runcmd_ordryrun_local @dpkgsource, qw(-b --), $leafdir;
	changedir $pwd;
	runcmd_ordryrun_local qw(sh -ec),
	    'exec >$1; shift; exec "$@"','x',
	    "../$sourcechanges",
	    @dpkggenchanges, qw(-S), changesopts();
    }
}

sub cmd_build_source {
    badusage "build-source takes no additional arguments" if @ARGV;
    build_source();
    printdone "source built, results in $dscfn and $sourcechanges";
}

sub cmd_sbuild {
    build_source();
    changedir "..";
    my $pat = changespat $version;
    if (act_local()) {
	stat_exists $dscfn or fail "$dscfn (in parent directory): $!";
	stat_exists $sourcechanges
	    or fail "$sourcechanges (in parent directory): $!";
	foreach my $cf (glob $pat) {
	    next if $cf eq $sourcechanges;
	    unlink $cf or fail "remove $cf: $!";
	}
    }
    runcmd_ordryrun_local @sbuild, qw(-d), $isuite, @ARGV, $dscfn;
    my @changesfiles = glob $pat;
    @changesfiles = sort {
	($b =~ m/_source\.changes$/ <=> $a =~ m/_source\.changes$/)
	    or $a cmp $b
    } @changesfiles;
    fail "wrong number of different changes files (@changesfiles)"
	unless @changesfiles==2;
    my $binchanges = parsecontrol($changesfiles[1], "binary changes file");
    foreach my $l (split /\n/, getfield $binchanges, 'Files') {
	fail "$l found in binaries changes file $binchanges"
	    if $l =~ m/\.dsc$/;
    }
    runcmd_ordryrun_local @mergechanges, @changesfiles;
    my $multichanges = changespat $version,'multi';
    if (act_local()) {
	stat_exists $multichanges or fail "$multichanges: $!";
	foreach my $cf (glob $pat) {
	    next if $cf eq $multichanges;
	    rename "$cf", "$cf.inmulti" or fail "$cf\{,.inmulti}: $!";
	}
    }
    printdone "build successful, results in $multichanges\n" or die $!;
}    

sub cmd_quilt_fixup {
    badusage "incorrect arguments to dgit quilt-fixup" if @ARGV;
    my $clogp = parsechangelog();
    $version = getfield $clogp, 'Version';
    $package = getfield $clogp, 'Source';
    check_not_dirty();
    clean_tree();
    build_maybe_quilt_fixup();
}

sub cmd_archive_api_query {
    badusage "need only 1 subpath argument" unless @ARGV==1;
    my ($subpath) = @ARGV;
    my @cmd = archive_api_query_cmd($subpath);
    debugcmd ">",@cmd;
    exec @cmd or fail "exec curl: $!\n";
}

sub cmd_clone_dgit_repos_server {
    badusage "need destination argument" unless @ARGV==1;
    my ($destdir) = @ARGV;
    $package = '_dgit-repos-server';
    my @cmd = (@git, qw(clone), access_giturl(), $destdir);
    debugcmd ">",@cmd;
    exec @cmd or fail "exec git clone: $!\n";
}

sub cmd_setup_mergechangelogs {
    badusage "no arguments allowed to dgit setup-mergechangelogs" if @ARGV;
    setup_mergechangelogs(1);
}

sub cmd_setup_useremail {
    badusage "no arguments allowed to dgit setup-mergechangelogs" if @ARGV;
    setup_useremail(1);
}

sub cmd_setup_new_tree {
    badusage "no arguments allowed to dgit setup-tree" if @ARGV;
    setup_new_tree();
}

#---------- argument parsing and main program ----------

sub cmd_version {
    print "dgit version $our_version\n" or die $!;
    exit 0;
}

our (%valopts_long, %valopts_short);
our @rvalopts;

sub defvalopt ($$$$) {
    my ($long,$short,$val_re,$how) = @_;
    my $oi = { Long => $long, Short => $short, Re => $val_re, How => $how };
    $valopts_long{$long} = $oi;
    $valopts_short{$short} = $oi;
    # $how subref should:
    #   do whatever assignemnt or thing it likes with $_[0]
    #   if the option should not be passed on to remote, @rvalopts=()
    # or $how can be a scalar ref, meaning simply assign the value
}

defvalopt '--since-version', '-v', '[^_]+|_', \$changes_since_version;
defvalopt '--distro',        '-d', '.+',      \$idistro;
defvalopt '',                '-k', '.+',      \$keyid;
defvalopt '--existing-package','', '.*',      \$existing_package;
defvalopt '--build-products-dir','','.*',     \$buildproductsdir;
defvalopt '--clean',       '', $cleanmode_re, \$cleanmode;
defvalopt '--quilt',     '', $quilt_modes_re, \$quilt_mode;

defvalopt '', '-c', '.*=.*', sub { push @git, '-c', @_; };

defvalopt '', '-C', '.+', sub {
    ($changesfile) = (@_);
    if ($changesfile =~ s#^(.*)/##) {
	$buildproductsdir = $1;
    }
};

defvalopt '--initiator-tempdir','','.*', sub {
    ($initiator_tempdir) = (@_);
    $initiator_tempdir =~ m#^/# or
	badusage "--initiator-tempdir must be used specify an".
	" absolute, not relative, directory."
};

sub parseopts () {
    my $om;

    if (defined $ENV{'DGIT_SSH'}) {
	@ssh = string_to_ssh $ENV{'DGIT_SSH'};
    } elsif (defined $ENV{'GIT_SSH'}) {
	@ssh = ($ENV{'GIT_SSH'});
    }

    my $oi;
    my $val;
    my $valopt = sub {
	my ($what) = @_;
	@rvalopts = ($_);
	if (!defined $val) {
	    badusage "$what needs a value" unless @ARGV;
	    $val = shift @ARGV;
	    push @rvalopts, $val;
	}
	badusage "bad value \`$val' for $what" unless
	    $val =~ m/^$oi->{Re}$(?!\n)/s;
	my $how = $oi->{How};
	if (ref($how) eq 'SCALAR') {
	    $$how = $val;
	} else {
	    $how->($val);
	}
	push @ropts, @rvalopts;
    };

    while (@ARGV) {
	last unless $ARGV[0] =~ m/^-/;
	$_ = shift @ARGV;
	last if m/^--?$/;
	if (m/^--/) {
	    if (m/^--dry-run$/) {
		push @ropts, $_;
		$dryrun_level=2;
	    } elsif (m/^--damp-run$/) {
		push @ropts, $_;
		$dryrun_level=1;
	    } elsif (m/^--no-sign$/) {
		push @ropts, $_;
		$sign=0;
	    } elsif (m/^--help$/) {
		cmd_help();
	    } elsif (m/^--version$/) {
		cmd_version();
	    } elsif (m/^--new$/) {
		push @ropts, $_;
		$new_package=1;
	    } elsif (m/^--([-0-9a-z]+)=(.+)/s &&
		     ($om = $opts_opt_map{$1}) &&
		     length $om->[0]) {
		push @ropts, $_;
		$om->[0] = $2;
	    } elsif (m/^--([-0-9a-z]+):(.*)/s &&
		     !$opts_opt_cmdonly{$1} &&
		     ($om = $opts_opt_map{$1})) {
		push @ropts, $_;
		push @$om, $2;
	    } elsif (m/^--ignore-dirty$/s) {
		push @ropts, $_;
		$ignoredirty = 1;
	    } elsif (m/^--no-quilt-fixup$/s) {
		push @ropts, $_;
		$quilt_mode = 'nocheck';
	    } elsif (m/^--no-rm-on-error$/s) {
		push @ropts, $_;
		$rmonerror = 0;
	    } elsif (m/^--(no-)?rm-old-changes$/s) {
		push @ropts, $_;
		$rmchanges = !$1;
	    } elsif (m/^--deliberately-($deliberately_re)$/s) {
		push @ropts, $_;
		push @deliberatelies, $&;
	    } elsif (m/^(--[-0-9a-z]+)(=|$)/ && ($oi = $valopts_long{$1})) {
		$val = $2 ? $' : undef; #';
		$valopt->($oi->{Long});
	    } else {
		badusage "unknown long option \`$_'";
	    }
	} else {
	    while (m/^-./s) {
		if (s/^-n/-/) {
		    push @ropts, $&;
		    $dryrun_level=2;
		} elsif (s/^-L/-/) {
		    push @ropts, $&;
		    $dryrun_level=1;
		} elsif (s/^-h/-/) {
		    cmd_help();
		} elsif (s/^-D/-/) {
		    push @ropts, $&;
		    $debuglevel++;
		    enabledebug();
		} elsif (s/^-N/-/) {
		    push @ropts, $&;
		    $new_package=1;
		} elsif (m/^-m/) {
		    push @ropts, $&;
		    push @changesopts, $_;
		    $_ = '';
		} elsif (s/^-wn$//s) {
		    push @ropts, $&;
		    $cleanmode = 'none';
		} elsif (s/^-wg$//s) {
		    push @ropts, $&;
		    $cleanmode = 'git';
		} elsif (s/^-wgf$//s) {
		    push @ropts, $&;
		    $cleanmode = 'git-ff';
		} elsif (s/^-wd$//s) {
		    push @ropts, $&;
		    $cleanmode = 'dpkg-source';
		} elsif (s/^-wdd$//s) {
		    push @ropts, $&;
		    $cleanmode = 'dpkg-source-d';
		} elsif (s/^-wc$//s) {
		    push @ropts, $&;
		    $cleanmode = 'check';
		} elsif (m/^-[a-zA-Z]/ && ($oi = $valopts_short{$&})) {
		    $val = $'; #';
		    $val = undef unless length $val;
		    $valopt->($oi->{Short});
		    $_ = '';
		} else {
		    badusage "unknown short option \`$_'";
		}
	    }
	}
    }
}

sub finalise_opts_opts () {
    foreach my $k (keys %opts_opt_map) {
	my $om = $opts_opt_map{$k};

	my $v = access_cfg("cmd-$k", 'RETURN-UNDEF');
	if (defined $v) {
	    badcfg "cannot set command for $k"
		unless length $om->[0];
	    $om->[0] = $v;
	}

	foreach my $c (access_cfg_cfgs("opts-$k")) {
	    my $vl = $gitcfg{$c};
	    printdebug "CL $c ",
	        ($vl ? join " ", map { shellquote } @$vl : ""),
	        "\n" if $debuglevel >= 4;
	    next unless $vl;
	    badcfg "cannot configure options for $k"
		if $opts_opt_cmdonly{$k};
	    my $insertpos = $opts_cfg_insertpos{$k};
	    @$om = ( @$om[0..$insertpos-1],
		     @$vl,
		     @$om[$insertpos..$#$om] );
	}
    }
}

if ($ENV{$fakeeditorenv}) {
    git_slurp_config();
    quilt_fixup_editor();
}

parseopts();
git_slurp_config();

print STDERR "DRY RUN ONLY\n" if $dryrun_level > 1;
print STDERR "DAMP RUN - WILL MAKE LOCAL (UNSIGNED) CHANGES\n"
    if $dryrun_level == 1;
if (!@ARGV) {
    print STDERR $helpmsg or die $!;
    exit 8;
}
my $cmd = shift @ARGV;
$cmd =~ y/-/_/;

if (!defined $rmchanges) {
    local $access_forpush;
    $rmchanges = access_cfg_bool(0, 'rm-old-changes');
}

if (!defined $quilt_mode) {
    local $access_forpush;
    $quilt_mode = cfg('dgit.force.quilt-mode', 'RETURN-UNDEF')
	// access_cfg('quilt-mode', 'RETURN-UNDEF')
	// 'linear';
    $quilt_mode =~ m/^($quilt_modes_re)$/ 
	or badcfg "unknown quilt-mode \`$quilt_mode'";
    $quilt_mode = $1;
}

if (!defined $cleanmode) {
    local $access_forpush;
    $cleanmode = access_cfg('clean-mode', 'RETURN-UNDEF');
    $cleanmode //= 'dpkg-source';

    badcfg "unknown clean-mode \`$cleanmode'" unless
	$cleanmode =~ m/^($cleanmode_re)$(?!\n)/s;
}

my $fn = ${*::}{"cmd_$cmd"};
$fn or badusage "unknown operation $cmd";
$fn->();