X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=dgit;h=6692f55cffbd149f03605e44d01f23bd998f3145;hp=7a9c9105f295b50cf207bdecd23bfa68497e453c;hb=326f8ea7f8a42e4cc3f422fea277822f82784c90;hpb=1b7deccf26864b71df56b218fd165ca4404397b4

diff --git a/dgit b/dgit
index 7a9c9105..6692f55c 100755
--- a/dgit
+++ b/dgit
@@ -1,122 +1,723 @@
 #!/usr/bin/perl -w
+# dgit
+# Integration between git and Debian-style archives
+#
+# Copyright (C)2013 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 IO::Handle;
 use Data::Dumper;
 use LWP::UserAgent;
 use Dpkg::Control::Hash;
+use File::Path;
+use POSIX;
 
-open DEBUG, ">&STDERR" or die $!;
-
-our $pdo = 'http://packages.debian.org/';
-#our $mirror = 'http://mirror.relativity.greenend.org.uk/mirror/debian-ftp/';
 our $suite = 'sid';
-our $package = 'userv';
+our $package;
+
+our $sign = 1;
+our $dryrun = 0;
+our $changesfile;
+our $new_package = 0;
+
+our %format_ok = map { $_=>1 } ("1.0","3.0 (native)","3.0 (quilt)");
+
+our (@git) = qw(git);
+our (@dget) = qw(dget);
+our (@dput) = qw(dput);
+our (@debsign) = qw(debsign);
+our $keyid;
+
+our $debug = 0;
+open DEBUG, ">/dev/null" or die $!;
+
+our %opts_opt_map = ('dget' => \@dget,
+		     'dput' => \@dput,
+		     'debsign' => \@debsign);
+
+our $remotename = 'dgit';
+our $ourdscfield = 'Vcs-Dgit-Master';
+our $branchprefix = 'dgit';
+
+sub lbranch () { return "$branchprefix/$suite"; }
+my $lbranch_re = '^refs/heads/'.$branchprefix.'/([^/.]+)$';
+sub lref () { return "refs/heads/".lbranch(); }
+sub lrref () { return "refs/remotes/$remotename/$suite"; }
+sub rrref () { return "refs/$branchprefix/$suite"; }
+sub debiantag ($) { return "debian/$_[0]"; }
 
-our $aliothname = 'iwj@git.debian.org';
-our $aliothpath = '/git/dgit-test';
-our $alioth_git = 'git+ssh://$aliothname/$aliothpath';
-our $alioth_sshtestbodge = [$aliothname,$aliothpath];
+sub fetchspec () {
+    local $suite = '*';
+    return  "+".rrref().":".lrref();
+}
 
-sub mainbranch () { return "$suite"; }
-sub uploadingbranch () { return "uploading/$suite"; }
+our $ua;
 
 sub url_get {
     if (!$ua) {
-	$ua = LWP::UserAgent->new;
+	$ua = LWP::UserAgent->new();
 	$ua->env_proxy;
     }
-print DEBUG "fetching @_...\n";
+    print "downloading @_...\n";
     my $r = $ua->get(@_) or die $!;
     die "$_[0]: ".$r->status_line."; failed.\n" unless $r->is_success;
     return $r->decoded_content();
 }
 
+our ($dscdata,$dscurl,$dsc);
+
+sub printcmd {
+    my $fh = shift @_;
+    my $intro = shift @_;
+    print $fh $intro or die $!;
+    local $_;
+    foreach my $a (@_) {
+	$_ = $a;
+	if (s{['\\]}{\\$&}g || m{\s} || m{[^-_./0-9a-z]}i) {
+	    print $fh " '$_'" or die $!;
+	} else {
+	    print $fh " $_" or die $!;
+	}
+    }
+    print $fh "\n" or die $!;
+}
+
+sub runcmd {
+    printcmd(\*DEBUG,"+",@_) if $debug>0;
+    $!=0; $?=0;
+    die "@_ $! $?" if system @_;
+}
+
+sub cmdoutput_errok {
+    die Dumper(\@_)." ?" if grep { !defined } @_;
+    printcmd(\*DEBUG,"|",@_) if $debug>0;
+    open P, "-|", @_ or die $!;
+    my $d;
+    $!=0; $?=0;
+    { local $/ = undef; $d = <P>; }
+    die if P->error;
+    close P or return undef;
+    chomp $d;
+    return $d;
+}
+
+sub cmdoutput {
+    my $d = cmdoutput_errok @_;
+    defined $d or die "@_ $? $!";
+    return $d;
+}
+
+sub dryrun_report {
+    printcmd(\*STDOUT,"#",@_);
+}
+
+sub runcmd_ordryrun {
+    if (!$dryrun) {
+	runcmd @_;
+    } else {
+	dryrun_report @_;
+    }
+}
+
+our %defcfg = ('dgit.default.distro' => 'debian',
+	       'dgit.default.username' => '',
+	       'dgit.default.archive-query-default-component' => 'main',
+	       'dgit.default.ssh' => 'ssh',
+	       'dgit-distro.debian.git-host' => 'git.debian.org',
+	       'dgit-distro.debian.git-proto' => 'git+ssh://',
+	       'dgit-distro.debian.git-path' => '/git/dgit-repos',
+	       'dgit-distro.debian.git-check' => 'ssh-cmd',
+	       'dgit-distro.debian.git-create' => 'ssh-cmd',
+	       'dgit-distro.debian.mirror' => 'http://ftp.debian.org/debian/');
+
+sub cfg {
+    foreach my $c (@_) {
+	my $v;
+	{
+	    local ($debug) = $debug-1;
+	    $v = cmdoutput_errok(@git, qw(config --), $c);
+	};
+	if ($?==0) {
+	    chomp $v;
+	    return $v;
+	} elsif ($?!=256) {
+	    die "$c $?";
+	}
+	my $dv = $defcfg{$c};
+	return $dv if defined $dv;
+    }
+    return undef;
+}
+
+sub access_distro () {
+    return cfg("dgit-suite.$suite.distro",
+	       "dgit.default.distro");
+}
+
+sub access_cfg ($) {
+    my ($key) = @_;
+    my $distro = access_distro();
+    my $value = cfg("dgit-distro.$distro.$key",
+		    "dgit.default.$key");
+    return $value;
+}
+
+sub access_gituserhost () {
+    my $user = access_cfg('git-user');
+    my $host = access_cfg('git-host');
+    return defined($user) && length($user) ? "$user\@$host" : $host;
+}
+
+sub access_giturl () {
+    my $url = access_cfg('git-url');
+    if (!defined $url) {
+	$url =
+	    access_cfg('git-proto').
+	    access_gituserhost().
+	    access_cfg('git-path');
+    }
+    return "$url/$package.git";
+}	       
+
+sub parsecontrol {
+    my $c = Dpkg::Control::Hash->new();
+    $c->load(@_) or return undef;
+    return $c;
+}
+
+sub parsechangelog {
+    my $c = Dpkg::Control::Hash->new();
+    my $p = new IO::Handle;
+    open $p, '-|', qw(dpkg-parsechangelog) or die $!;
+    $c->parse($p);
+    $?=0; $!=0; close $p or die "$! $?";
+    return $c;
+}
+
+our $rmad;
+
+sub archive_query () {
+    my $query = access_cfg('archive-query');
+    $query ||= "madison:".access_distro();
+    $query =~ s/^(\w+):// or die "$query ?";
+    my $proto = $1;
+    my $url = $'; #';
+    die unless $proto eq 'madison';
+    $rmad ||= cmdoutput qw(rmadison -asource),"-s$suite","-u$url",$package;
+    if (!length $rmad) {
+	return ();
+    }
+    $rmad =~ m{^ \s*( [^ \t|]+ )\s* \|
+                 \s*( [^ \t|]+ )\s* \|
+                 \s*( [^ \t|/]+ )(?:/([^ \t|/]+)) \s* \|
+                 \s*( [^ \t|]+ )\s* }x or die "$rmad $?";
+    $1 eq $package or die "$rmad $package ?";
+    my $vsn = $2;
+    if ($suite ne $3) {
+	# madison canonicalises for us
+	print "canonical suite name for $suite is $3\n";
+	$suite = $3;
+    }
+    my $component;
+    if (defined $4) {
+	$component = $4;
+    } else {
+	$component = access_cfg('archive-query-default-component');
+    }
+    $5 eq 'source' or die "$rmad ?";
+    my $prefix = substr($package, 0, $package =~ m/^l/ ? 4 : 1);
+    my $subpath = "/pool/$component/$prefix/$package/${package}_$vsn.dsc";
+    return ($vsn,$subpath);
+}
+
+sub canonicalise_suite () {
+    archive_query();
+}
+
 sub get_archive_dsc () {
-    my $pdourl = "$pdo/source/$suite/$package";
-    my $pdodata = url_get($pdourl);
-    # FFS.  The Debian archive has no sane way to find what 
-    # version is currently the tip in any branch (aka, what
-    # is the current version in any suite).
-    $pdodata =~ m{
-        Download\ \Q$package\E .*
-        \<a\ href=\"([^"&]+([^"/]+\.dsc))\"\>\2\</a\>
-    }msx
-        or die "screenscraping of $pdourl failed :-(\n";
-    my $dscurl = $1;
-print DEBUG Dumper($pdodata, $&, $dscurl);
-    my $dscdata = url_get($dscurl);
+    my ($vsn,$subpath) = archive_query();
+    if (!defined $vsn) { $dsc=undef; return undef; }
+    $dscurl = access_cfg('mirror').$subpath;
+    $dscdata = url_get($dscurl);
     my $dscfh = new IO::File \$dscdata, '<' or die $!;
-print DEBUG Dumper($dscdata, $dscfh);
-    my $dscp = Dpkg::Control::Hash->new(allow_pgp=>1);
-    $dscp->parse($dscfh, 'dsc') or die "parsing of $dscurl failed\n";
-    mu $dscf = $dscp->{'fields'};
-    die "unsupported format $dscf->{Format}, sorry\n"
-	unless $dscf->{Format} eq '1.0';
-    return $dsc;
+    print DEBUG Dumper($dscdata) if $debug>1;
+    $dsc = Dpkg::Control::Hash->new(allow_pgp=>1);
+    $dsc->parse($dscfh, 'dsc') or die "parsing of $dscurl failed\n";
+    print DEBUG Dumper($dsc) if $debug>1;
+    my $fmt = $dsc->{Format};
+    die "unsupported format $fmt, sorry\n" unless $format_ok{$fmt};
 }
 
 sub check_for_git () {
     # returns 0 or 1
-    open P, "ssh $alioth_sshtestbodge->[0] '".
-	"set -e; cd /git/dgit-test;".
-	"if test -d $package.git; then echo 1; else echo 0; fi".
-	"' |"
-	or die $!;
-    $!=0; $?=0;
-    my $r = <P>; close P;
-    die "$r $! $?" unless $r =~ m/^[01]$/;
-    return !!$r;
+    my $how = access_cfg('git-check');
+    if ($how eq 'ssh-cmd') {
+	my $r= cmdoutput
+	    (access_cfg('ssh'),access_gituserhost(),
+	     " set -e; cd ".access_cfg('git-path').";".
+	     " if test -d $package.git; then echo 1; else echo 0; fi");
+	print DEBUG "got \`$r'\n";
+	die "$r $! $?" unless $r =~ m/^[01]$/;
+	return $r+0;
+    } else {
+	die "unknown git-check $how ?";
+    }
 }
 
-sub runcmd {
-    $!=0; $?=0;
-    die "$! $?" if system @_;
+sub create_remote_git_repo () {
+    my $how = access_cfg('git-create');
+    if ($how eq 'ssh-cmd') {
+	runcmd_ordryrun
+	    (access_cfg('ssh'),access_gituserhost(),
+	     "set -e; cd ".access_cfg('git-path').";".
+	     " mkdir -p $package.git;".
+	     " cd $package.git;".
+	     " if ! test -d objects; then git init --bare; fi");
+    } else {
+	die "unknown git-create $how ?";
+    }
 }
 
-our ($dsc,$dsc_hash);
+our ($dsc_hash,$upload_hash);
 
-sub combine () {
-    if (defined $dsc_hash) {
-	
+our $ud = '.git/dgit/unpack';
+
+sub prep_ud () {
+    rmtree($ud);
+    mkpath '.git/dgit';
+    mkdir $ud or die $!;
+}
+
+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;
+    chdir $dir or die "$dir $!";
+    die if stat '.git';
+    die $! unless $!==&ENOENT;
+    runcmd qw(git init -q);
+    rmtree('.git/objects');
+    symlink '../../../../objects','.git/objects' or die $!;
+    runcmd @git, qw(add -Af);
+    my $tree = cmdoutput @git, qw(write-tree);
+    chomp $tree; $tree =~ m/^\w+$/ or die "$tree ?";
+    return ($tree,$dir);
+}
+
+sub dsc_files () {
+    map {
+	m/^\w+ \d+ (\S+)$/ or die "$_ ?";
+	$1;
+    } grep m/\S/, split /\n/, ($dsc->{'Checksums-Sha256'} || $dsc->{Files});
+}
+
+sub is_orig_file ($) {
+    local ($_) = @_;
+    m/\.orig(?:-\w+)?\.tar\.\w+$/;
+}
+
+sub generate_commit_from_dsc () {
+    prep_ud();
+    chdir $ud or die $!;
+    my @files;
+    foreach my $f (dsc_files()) {
+	die if $f =~ m#/|^\.|\.dsc$|\.tmp$#;
+	push @files, $f;
+	link "../../../$f", $f
+	    or $!==&ENOENT
+	    or die "$f $!";
+    }
+    runcmd @dget, qw(--), $dscurl;
+    foreach my $f (grep { is_orig_file($_) } @files) {
+	link $f, "../../../../$f"
+	    or $!==&EEXIST
+	    or die "$f $!";
+    }
+    my ($tree,$dir) = mktree_in_ud_from_only_subdir();
+    runcmd qw(sh -ec), 'dpkg-parsechangelog >../changelog.tmp';
+    my $clogp = parsecontrol('../changelog.tmp','changelog') or die;
+    my $date = cmdoutput qw(date), '+%s %z', qw(-d),$clogp->{Date};
+    my $author = $clogp->{Maintainer};
+    $author =~ s#,.*##ms;
+    my $authline = "$author $date";
+    $authline =~ m/^[^<>]+ \<\S+\> \d+ [-+]\d+$/ or die $authline;
+    open C, ">../commit.tmp" or die $!;
+    print C "tree $tree\n" or die $!;
+    print C "parent $upload_hash\n" or die $! if $upload_hash;
+    print C <<END or die $!;
+author $authline
+committer $authline
+
+$clogp->{Changes}
+
+# imported by dgit from the archive
+END
+    close C or die $!;
+    my $commithash = cmdoutput @git, qw(hash-object -w -t commit ../commit.tmp);
+    print "synthesised git commit from .dsc $clogp->{Version}\n";
+    chdir '../../../..' or die $!;
+    cmdoutput @git, qw(update-ref -m),"dgit synthesise $clogp->{Version}",
+              'DGIT_ARCHIVE', $commithash;
+    cmdoutput @git, qw(log -n2), $commithash;
+    # ... gives git a chance to complain if our commit is malformed
+    my $outputhash = $commithash;
+    if ($upload_hash) {
+	chdir "$ud/$dir" or die $!;
+	runcmd @git, qw(reset --hard), $upload_hash;
+	runcmd qw(sh -ec), 'dpkg-parsechangelog >>../changelogold.tmp';
+	my $oldclogp = Dpkg::Control::Hash->new();
+	$oldclogp->parse('../changelogold.tmp','previous changelog') or die;
+	my $vcmp =
+	    version_compare_string($oldclogp->{Version}, $clogp->{Version});
+	if ($vcmp < 0) {
+	    # git upload/ is earlier vsn than archive, use archive
+	} elsif ($vcmp >= 0) {
+	    print STDERR <<END or die $!;
+Version actually in archive:    $clogp->{Version} (older)
+Last allegedly pushed/uploaded: $oldclogp->{Version} (newer or same)
+Perhaps the upload is stuck in incoming.  Using the version from git.
+END
+	} else {
+	    die "version in archive is same as version in git".
+		" to-be-uploaded (upload/) branch but archive".
+		" version hash no commit hash?!\n";
+        }
+	chdir '../../../..' or die $!;
+    }
+    rmtree($ud);
+    return $outputhash;
+}
+
+sub ensure_we_have_orig () {
+    foreach my $f (dsc_files()) {
+	next unless is_orig_file($f);
+	if (stat "../$f") {
+	    die "$f ?" unless -f _;
+	} else {
+	    die "$f $!" unless $!==&ENOENT;
+	}
+	my $origurl = $dscurl;
+	$origurl =~ s{/[^/]+$}{};
+	$origurl .= "/$f";
+	die "$f ?" unless $f =~ m/^${package}_/;
+	die "$f ?" if $f =~ m#/#;
+	runcmd_ordryrun qw(sh -ec),'cd ..; exec "$@"','x',
+	    @dget,'--',$origurl;
+    }
+}
 
-	open P, "-|", qw(git rev-parse --), $dsc_hash;
-	
+sub rev_parse ($) {
+    return cmdoutput @git, qw(rev-parse), "$_[0]~0";
 }
 
-sub clone () {
-    $dsc = get_archive_dsc();
-    $dsc_hash = $dsc->{Vcs-git-master};
-    if (defined $dsh_hash) {
+sub is_fast_fwd ($$) {
+    my ($ancestor,$child) = @_;
+    my $mb = cmdoutput @git, qw(merge-base), $dsc_hash, $upload_hash;
+    return rev_parse($mb) eq rev_parse($ancestor);
+}
+
+sub git_fetch_us () {
+    die "cannot dry run with fetch" if $dryrun;
+    runcmd @git, qw(fetch),access_giturl(),fetchspec();
+}
+
+sub fetch_from_archive () {
+    # ensures that lrref() is what is actually in the archive,
+    #  one way or another
+    get_archive_dsc() or return 0;
+    $dsc_hash = $dsc->{$ourdscfield};
+    if (defined $dsc_hash) {
 	$dsc_hash =~ m/\w+/ or die "$dsc_hash $?";
 	$dsc_hash = $&;
+	print "last upload to archive specified git hash\n";
+    } else {
+	print "last upload to archive has NO git hash\n";
     }
-    my $dstdir = "$package";
+
+    $!=0; $upload_hash =
+	cmdoutput_errok @git, qw(show-ref --heads), lrref();
+    if ($?==0) {
+	die unless chomp $upload_hash;
+    } elsif ($?==256) {
+	$upload_hash = '';
+    } else {
+	die $?;
+    }
+    my $hash;
+    if (defined $dsc_hash) {
+	die "missing git history even though dsc has hash"
+	    unless $upload_hash;
+	$hash = $dsc_hash;
+	ensure_we_have_orig();
+    } else {
+	$hash = generate_commit_from_dsc();
+    }
+    if ($upload_hash) {
+	die "not fast forward on last upload branch!".
+	    " (archive's version left in DGIT_ARCHIVE)"
+	    unless is_fast_fwd($dsc_hash, $upload_hash);
+    }
+    if ($upload_hash ne $hash) {
+	my @upd_cmd = (@git, qw(update-ref -m), 'dgit fetch', lrref(), $hash);
+	if (!$dryrun) {
+	    cmdoutput @upd_cmd;
+	} else {
+	    dryrun_report @upd_cmd;
+	}
+    }
+    return 1;
+}
+
+sub clone ($) {
+    my ($dstdir) = @_;
+    die "dry run makes no sense with clone" if $dryrun;
+    mkdir $dstdir or die "$dstdir $!";
+    chdir "$dstdir" or die "$dstdir $!";
+    runcmd @git, qw(init -q);
+    runcmd @git, qw(config), "remote.$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', access_giturl();
     if (check_for_git()) {
-	runcmd qw(git clone --origin dgit -b), $suite, '--',
-	    $alioth_git, $dstdir;
-	chdir "$dstdir" or die "$dstdir $!";
-	combine();
+	print "fetching existing git history\n";
+	git_fetch_us();
+	runcmd @git, qw(fetch origin);
     } else {
-	mkdir $dstdir or die "$dstdir $!";
-	chdir "$dstdir" or die "$dstdir $!";
-	runcmd qw(git init);
-	open H, "> .git/refs/HEAD" or die $!;
-	print H "ref: refs/heads/$suite\n" or die $!;
-	close H or die $!;
-	runcmd qw(git remote add dgit), $alioth_git;
-	runcmd "git config branch.$suite.remote dgit";
-	runcmd "git config branch.$suite.merge refs/heads/$suite";
-	combine();
+	print "starting new git history\n";
     }
+    fetch_from_archive() or die;
+    runcmd @git, qw(reset --hard), lrref();
+    print "ready for work in $dstdir\n";
 }
 
 sub fetch () {
-    my ($archive_or_mirror, $suite, $package) = @_;
-    my $dsc = get_archive_dsc();
-    
-    with_tmpdir($td,{
-	
-    });
-
-print Dumper(get_archive_dsc());
+    if (check_for_git()) {
+	git_fetch_us();
+    }
+    fetch_from_archive() or die;
+}
+
+sub pull () {
+    fetch();
+    runcmd_ordryrun @git, qw(merge -m),"Merge from $suite [dgit]",
+        lrref();
+}
+
+sub dopush () {
+    runcmd @git, qw(diff --quiet HEAD);
+    my $clogp = parsechangelog();
+    $package = $clogp->{Source};
+    my $dscfn = "${package}_$clogp->{Version}.dsc";
+    stat "../$dscfn" or die "$dscfn $!";
+    $dsc = parsecontrol("../$dscfn");
+    prep_ud();
+    chdir $ud or die $!;
+    print "checking that $dscfn corresponds to HEAD\n";
+    runcmd qw(dpkg-source -x --), "../../../../$dscfn";
+    my ($tree,$dir) = mktree_in_ud_from_only_subdir();
+    chdir '../../../..' or die $!;
+    runcmd @git, qw(diff --exit-code), $tree;
+#fetch from alioth
+#do fast forward check and maybe fake merge
+#    if (!is_fast_fwd(mainbranch
+#    runcmd @git, qw(fetch -p ), "$alioth_git/$package.git",
+#        map { lref($_).":".rref($_) }
+#        (uploadbranch());
+    $dsc->{$ourdscfield} = rev_parse('HEAD');
+    $dsc->save("../$dscfn.tmp") or die $!;
+    if (!$dryrun) {
+	rename "../$dscfn.tmp","../$dscfn" or die "$dscfn $!";
+    } else {
+	print "[new .dsc left in $dscfn.tmp]\n";
+    }
+    if (!$changesfile) {
+	my $pat = "../${package}_$clogp->{Version}_*.changes";
+	my @cs = glob $pat;
+        die "$pat ?" unless @cs==1;
+	($changesfile) = @cs;
+    }
+    my $tag = debiantag($dsc->{Version});
+    if (!check_for_git()) {
+	create_remote_git_repo();
+    }
+    runcmd_ordryrun @git, qw(push),access_giturl(),"HEAD:".rrref();
+    if ($sign) {
+	my @tag_cmd = (@git, qw(tag -s -m),
+		       "Release $dsc->{Version} for $suite [dgit]");
+	push @tag_cmd, qw(-u),$keyid if defined $keyid;
+	push @tag_cmd, $tag;
+	runcmd_ordryrun @tag_cmd;
+	my @debsign_cmd = @debsign;
+	push @debsign_cmd, "-k$keyid" if defined $keyid;
+	push @debsign_cmd, $changesfile;
+	runcmd_ordryrun @debsign_cmd;
+    }
+    runcmd_ordryrun @git, qw(push),access_giturl(),"refs/tags/$tag";
+    my $host = access_cfg('upload-host');
+    my @hostarg = defined($host) ? ($host,) : ();
+    runcmd_ordryrun @dput, @hostarg, $changesfile;
+}
+
+sub cmd_clone {
+    parseopts();
+    my $dstdir;
+    die if defined $package;
+    if (@ARGV==1) {
+	($package) = @ARGV;
+    } elsif (@ARGV==2 && $ARGV[1] =~ m#^\w#) {
+	($package,$suite) = @ARGV;
+    } elsif (@ARGV==2 && $ARGV[1] =~ m#^[./]#) {
+	($package,$dstdir) = @ARGV;
+    } elsif (@ARGV==3) {
+	($package,$suite,$dstdir) = @ARGV;
+    } else {
+	die;
+    }
+    $dstdir ||= "$package";
+    clone($dstdir);
+}
+
+sub branchsuite () {
+    my $branch = cmdoutput_errok @git, qw(symbolic-ref HEAD);
+    chomp $branch;
+    if ($branch =~ m#$lbranch_re#o) {
+	return $1;
+    } else {
+	return undef;
+    }
+}
+
+sub fetchpullargs () {
+    if (!defined $package) {
+	my $sourcep = parsecontrol('debian/control');
+	$package = $sourcep->{Source};
+    }
+    if (@ARGV==0) {
+	$suite = branchsuite();
+	if (!$suite) {
+	    my $clogp = parsechangelog();
+	    $suite = $clogp->{Distribution};
+	}
+	canonicalise_suite();
+	print "fetching from suite $suite\n";
+    } elsif (@ARGV==1) {
+	($suite) = @ARGV;
+	canonicalise_suite();
+    } else {
+	die;
+    }
+}
+
+sub cmd_fetch {
+    parseopts();
+    fetchpullargs();
+    fetch();
+}
+
+sub cmd_pull {
+    parseopts();
+    fetchpullargs();
+    pull();
+}
+
+sub cmd_push {
+    parseopts();
+    die if defined $package;
+    my $clogp = parsechangelog();
+    $package = $clogp->{Source};
+    if (@ARGV==0) {
+	$suite = $clogp->{Distribution};
+	if ($new_package) {
+	    local ($package) = 'dpkg';
+	    canonicalise_suite();
+	}
+    } else {
+	die;
+    }
+    if (fetch_from_archive()) {
+	is_fast_fwd(lrref(), 'HEAD') or die;
+    } else {
+	die unless $new_package;
+    }
+    dopush();
+}
+
+sub cmd_build {
+    # we pass further options and args to git-buildpackage
+    die if defined $package;
+    my $clogp = parsechangelog();
+    $suite = $clogp->{Distribution};
+    $package = $clogp->{Source};
+    canonicalise_suite();
+    runcmd_ordryrun
+	qw(git-buildpackage -us -uc --git-no-sign-tags),
+	'--git-builder=dpkg-buildpackage -i\.git/ -I.git',
+	"--git-debian-branch=".lbranch(),
+	@ARGV;
+}
+
+sub parseopts () {
+    my $om;
+    while (@ARGV) {
+	last unless $ARGV[0] =~ m/^-/;
+	$_ = shift @ARGV;
+	last if m/^--?$/;
+	if (m/^--/) {
+	    if (m/^--dry-run$/) {
+		$dryrun=1;
+	    } elsif (m/^--no-sign$/) {
+		$sign=0;
+	    } elsif (m/^--new$/) {
+		$new_package=1;
+	    } elsif (m/^--(\w+)=(.*)/s && ($om = $opts_opt_map{$1})) {
+		$om->[0] = $2;
+	    } elsif (m/^--(\w+):(.*)/s && ($om = $opts_opt_map{$1})) {
+		push @$om, $2;
+	    } else {
+		die "$_ ?";
+	    }
+	} else {
+	    while (m/^-./s) {
+		if (s/^-n/-/) {
+		    $dryrun=1;
+		} elsif (s/^-D/-/) {
+		    open DEBUG, ">&STDERR" or die $!;
+		    $debug++;
+		} elsif (s/^-N/-/) {
+		    $new_package=1;
+		} elsif (s/^-c(.*=.*)//s) {
+		    push @git, '-c', $1;
+		} elsif (s/^-C(.*)//s) {
+		    $changesfile = $1;
+		} elsif (s/^-k(.*)//s) {
+		    $keyid=$1;
+		} else {
+		    die "$_ ?";
+		}
+	    }
+	}
+    }
+}
+
+parseopts();
+die unless @ARGV;
+my $cmd = shift @ARGV;
+
+{ no strict qw(refs); &{"cmd_$cmd"}(); }