#!/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 .
use strict;
use IO::Handle;
use Data::Dumper;
use LWP::UserAgent;
use Dpkg::Control::Hash;
use File::Path;
use POSIX;
our $mirror = 'http://mirror.relativity.greenend.org.uk/mirror/debian-ftp/';
our $suite = 'sid';
our $package;
our $sign = 1;
our $dryrun = 0;
our $changesfile;
our $aliothname = 'iwj@git.debian.org';
our $aliothpath = '/git/dgit-repos';
our $alioth_git = "git+ssh://$aliothname/$aliothpath";
our $alioth_sshtestbodge = [$aliothname,$aliothpath];
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;
open DEBUG, ">/dev/null" or die $!;
our %opts_opt_map = ('dget' => \@dget,
'dput' => \@dput,
'debsign' => \@debsign);
our $remotename = 'dgit';
our $ourdscfield = 'Vcs-Git-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]"; }
sub fetchspec () {
local $suite = '*';
return "+".rrref().":".lrref();
}
our $ua;
sub url_get {
if (!$ua) {
$ua = LWP::UserAgent->new();
$ua->env_proxy;
}
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,"+",@_);
$!=0; $?=0;
die "@_ $! $?" if system @_;
}
sub cmdoutput_errok {
printcmd(\*DEBUG,"|",@_);
open P, "-|", @_ or die $!;
my $d;
$!=0; $?=0;
{ local $/ = undef; $d =
; }
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 @_;
}
}
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 askmadison () {
$rmad ||= cmdoutput qw(rmadison -asource),"-s$suite",$package;
$rmad =~ m/^ \s*( [^ \t|]+ )\s* \|
\s*( [^ \t|]+ )\s* \|
\s*( [^ \t|]+ )\s* \|
\s*( [^ \t|]+ )\s* /x or die "$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;
}
$4 eq 'source' or die "$rmad ?";
return $vsn;
}
sub canonicalise_suite () {
askmadison();
}
sub get_archive_dsc () {
my $vsn = askmadison();
# fixme madison does not show us the component
my $prefix = substr($package, 0, $package =~ m/^l/ ? 4 : 1);
$dscurl = "$mirror/pool/main/$prefix/$package/${package}_$vsn.dsc";
$dscdata = url_get($dscurl);
my $dscfh = new IO::File \$dscdata, '<' or die $!;
print DEBUG Dumper($dscdata);
$dsc = Dpkg::Control::Hash->new(allow_pgp=>1);
$dsc->parse($dscfh, 'dsc') or die "parsing of $dscurl failed\n";
print DEBUG Dumper($dsc);
my $fmt = $dsc->{Format};
die "unsupported format $fmt, sorry\n" unless $format_ok{$fmt};
}
sub check_for_git () {
# returns 0 or 1
my $cmd=
"ssh $alioth_sshtestbodge->[0] '".
" set -e; cd $alioth_sshtestbodge->[1];".
" if test -d $package.git; then echo 1; else echo 0; fi".
"'";
print DEBUG "$cmd\n";
open P, "$cmd |" or die $!;
$!=0; $?=0;
my $r =
; close P;
print DEBUG ">$r<\n";
die "$r $! $?" unless $r =~ m/^[01]$/;
return $r+0;
}
our ($dsc_hash,$upload_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 <{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 <{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,'--',$origurl;
}
}
sub rev_parse ($) {
return cmdoutput @git, qw(rev-parse), "$_[0]~0";
}
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 $dryrun;
runcmd @git, qw(fetch),$remotename,fetchspec();
}
sub fetch_from_archive () {
# ensures that lrref() is what is actually in the archive,
# one way or another
get_archive_dsc();
$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";
}
$!=0; $upload_hash =
cmdoutput_errok @git, qw(show-ref --heads), lrref();
die $! if $!;
die $? unless ($?==0 && chomp $upload_hash)
or ($?==256 && !length $upload_hash);
$upload_hash ||= '';
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;
}
}
}
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 $!;
runcmd @git, qw(remote add), 'origin', "$alioth_git/$package.git";
if (check_for_git()) {
print "fetching existing git history\n";
git_fetch_us();
runcmd @git, qw(fetch origin);
} else {
print "starting new git history\n";
}
fetch_from_archive();
runcmd @git, qw(reset --hard), lrref();
print "ready for work in $dstdir\n";
}
sub fetch () {
if (check_for_git()) {
git_fetch_us();
}
fetch_from_archive();
}
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()) {
runcmd_ordryrun qw(ssh),$alioth_sshtestbodge->[0],
"set -e; cd $alioth_sshtestbodge->[1];".
" mkdir -p $package.git;".
" cd $package.git;".
" if ! test -d objects; then git init --bare; fi";
}
runcmd_ordryrun @git, qw(push),$remotename,"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, $changesfile;
runcmd_ordryrun @debsign_cmd;
}
runcmd_ordryrun @git, qw(push),$remotename,"refs/tags/$tag";
runcmd_ordryrun @dput, $changesfile;
}
sub cmd_clone {
my $dstdir;
if (@ARGV==1) {
($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 () {
my $clogp = parsechangelog();
$package = $clogp->{Source};
if (@ARGV==0) {
$suite = branchsuite();
$suite ||= $clogp->{Distribution};
canonicalise_suite();
print "fetching from suite $suite\n";
} elsif (@ARGV==1) {
($suite) = @ARGV;
canonicalise_suite();
} else {
die;
}
}
sub cmd_fetch {
fetchpullargs();
fetch();
}
sub cmd_pull {
fetchpullargs();
pull();
}
sub cmd_push {
my $clogp = parsechangelog();
$package = $clogp->{Source};
if (@ARGV==0) {
$suite = $clogp->{Distribution};
canonicalise_suite();
} else {
die;
}
dopush();
}
sub cmd_build {
my $clogp = parsechangelog();
$suite = $clogp->{Distribution};
$package = $clogp->{Source};
canonicalise_suite();
runcmd_ordryrun
qw(git-buildpackage -us -uc --git-no-sign-tags),
"--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$/) {
$dryrun=1;
} elsif (m/^--no-sign$/) {
$sign=0;
} elsif (m/^--(\w+)=(.*)/s && ($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 $!;
} elsif (s/^-c(.*=.*)//s) {
push @git, $1;
} elsif (s/^-C(.*)//s) {
$changesfile = $1;
} elsif (s/^-k(.*)//s) {
$keyid=$1;
} else {
die "$_ ?";
}
}
}
}
}
parseopts();
die unless @ARGV;
my $cmd = shift @ARGV;
parseopts();
{ no strict qw(refs); &{"cmd_$cmd"}(); }