#!/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 $mirror = 'http://mirror.relativity.greenend.org.uk/mirror/debian-ftp/';
our $suite = 'sid';
-our $package = 'userv';
+our $package;
our $aliothname = 'iwj@git.debian.org';
our $aliothpath = '/git/dgit-test';
-our $alioth_git = 'git+ssh://$aliothname/$aliothpath';
+our $alioth_git = "git+ssh://$aliothname/$aliothpath";
our $alioth_sshtestbodge = [$aliothname,$aliothpath];
+our (@dget_opts) = qw(-u);
+
+our $remotename = 'dgit';
+
sub mainbranch () { return "$suite"; }
-sub uploadingbranch () { return "uploading/$suite"; }
+sub uploadbranch () { return "upload/$suite"; }
+
+our $ua;
sub url_get {
if (!$ua) {
- $ua = LWP::UserAgent->new;
+ $ua = LWP::UserAgent->new();
$ua->env_proxy;
}
-print DEBUG "fetching @_...\n";
+ print DEBUG "fetching @_...\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 runcmd {
+ $!=0; $?=0;
+ die "@_ $! $?" if system @_;
+}
+
+sub cmdoutput {
+ open P, "-|", @_ or die $!;
+ my $d;
+ $!=0; $?=0;
+ { local $/ = undef; $d = <P>; }
+ die if P->error;
+ close P or die "@_ $? $!";
+ chomp $d;
+ return $d;
+}
+
+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::File '-|', qw(dpkg-parsechangelog) or die $!;
+ $c->parse($p);
+ $?=0; $!=0; close $p or die "$! $?";
+ return $c;
+}
+
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 $rmad = cmdoutput qw(rmadison -asource),"-s$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;
+ $3 eq $suite or die "$rmad $suite ?";
+ $4 eq 'source' or die "$rmad ?";
+ # fixme it 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";
+#print DEBUG Dumper($pdodata, $&, $dscurl);
+ $dscdata = url_get($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, $dscfh);
+ $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 $fmt eq '1.0';
}
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 $!;
+ my $cmd=
+ "ssh $alioth_sshtestbodge->[0] '".
+ " set -e; cd /git/dgit-test;".
+ " if test -d $package.git; then echo 1; else echo 0; fi".
+ "'";
+ #print DEBUG "$cmd\n";
+ open P, "$cmd |" or die $!;
$!=0; $?=0;
my $r = <P>; close P;
+#print STDERR ">$r<\n";
die "$r $! $?" unless $r =~ m/^[01]$/;
- return !!$r;
+ return $r+0;
}
-sub runcmd {
- $!=0; $?=0;
- die "$! $?" if system @_;
+our ($dsc_hash,$lastupl_hash);
+
+our $ud = '.git/dgit/unpack';
+
+sub prep_ud () {
+ rmtree($ud);
+ mkpath '.git/dgit';
+ mkdir $ud or die $!;
}
-our ($dsc,$dsc_hash);
+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 qw(git add -Af);
+ my $tree = cmdoutput qw(git write-tree);
+ chomp $tree; $tree =~ m/^\w+$/ or die "$tree ?";
+ return ($tree,$dir);
+}
-sub combine () {
- if (defined $dsc_hash) {
-
+sub generate_commit_from_dsc () {
+ prep_ud();
+ chdir $ud or die $!;
+ my @files;
+ foreach (split /\n/, ($dsc->{'Checksums-Sha256'} || $dsc->{Files})) {
+ next unless m/\S/;
+ m/^\w+ \d+ (\S+)$/ or die "$_ ?";
+ my $f = $1;
+ die if $f =~ m#/|^\.|\.dsc$|\.tmp$#;
+ push @files, $f;
+ link "../../../$f", $f
+ or $!==&ENOENT
+ or die "$f $!";
+ }
+ runcmd qw(dget), @dget_opts, qw(--), $dscurl;
+ foreach my $f (grep { m/\.tar\.gz$/ } @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 $lastupl_hash\n" or die $! if defined $lastupl_hash;
+ print C <<END or die $!;
+author $authline
+committer $authline
+
+$clogp->{Changes}
- open P, "-|", qw(git rev-parse --), $dsc_hash;
-
+# imported by dgit from the archive
+END
+ close C or die $!;
+ print "synthesised git commit from .dsc $clogp->{Version}\n";
+ my $commithash = cmdoutput qw(git hash-object -w -t commit ../commit.tmp);
+ chdir '../../../..' or die $!;
+ cmdoutput qw(git update-ref -m),"dgit synthesise $clogp->{Version}",
+ 'DGIT_ARCHIVE', $commithash;
+ cmdoutput qw(git log -n2), $commithash;
+ # ... gives git a chance to complain if our commit is malformed
+ my $outputhash = $commithash;
+ if (defined $lastupl_hash) {
+ chdir "$ud/$dir" or die $!;
+ runcmd qw(git reset --hard), $lastupl_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;
+}
+
+my $lastupl_ref = "refs/remotes/$remotename/upload/$suite";
+
+sub rev_parse ($) {
+ return cmdoutput qw(git rev-parse --), "$_[0]~0";
+}
+
+sub is_fast_fwd ($$) {
+ my ($ancestor,$child) = @_;
+ my $mb = cmdoutput qw(git merge-base), $dsc_hash, $lastupl_hash;
+ return rev_parse($mb) eq rev_parse($ancestor);
+}
+
+sub fetch_from_archive () {
+ # ensures that $lastupl_ref is what is actually in the archive,
+ # one way or another
+ $!=0; $lastupl_hash = `git show-ref --heads $lastupl_ref`;
+ die $! if $!;
+ die $? unless ($?==0 && chomp $lastupl_hash)
+ or ($?==128 && !length $lastupl_hash);
+ my $hash;
+ if (defined $dsc_hash) {
+ $hash = $dsc_hash;
+ } else {
+ $hash = generate_commit_from_dsc();
+ }
+ if ($lastupl_hash) {
+ die "not fast forward on last upload branch!".
+ " (archive's version left in DGIT_ARCHIVE)"
+ unless is_fast_fwd($lastupl_hash, $dsc_hash);
+ }
+ if ($lastupl_ref ne $hash) {
+ cmdoutput qw(git update-ref -m), 'dgit fetch', $lastupl_ref, $hash;
+ }
}
sub clone () {
- $dsc = get_archive_dsc();
- $dsc_hash = $dsc->{Vcs-git-master};
- if (defined $dsh_hash) {
+ get_archive_dsc();
+ $dsc_hash = $dsc->{'Vcs-git-master'};
+ 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";
if (check_for_git()) {
- runcmd qw(git clone --origin dgit -b), $suite, '--',
+ print "cloning existing git history\n";
+ runcmd qw(git clone --origin),$remotename, qw(-b), $suite, '--',
$alioth_git, $dstdir;
chdir "$dstdir" or die "$dstdir $!";
- combine();
+ fetch_from_archive();
+ runcmd qw(git reset --hard), $lastupl_ref;
} else {
+ die "missing git history even though dsc has hash" if defined $dsc_hash;
+ print "starting new git history\n";
mkdir $dstdir or die "$dstdir $!";
chdir "$dstdir" or die "$dstdir $!";
- runcmd qw(git init);
- open H, "> .git/refs/HEAD" or die $!;
+ runcmd qw(git init -q);
+ open H, "> .git/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 qw(git remote add), $remotename, $alioth_git;
+ runcmd "git config branch.$suite.remote $remotename";
runcmd "git config branch.$suite.merge refs/heads/$suite";
- combine();
+ my $newhash = generate_commit_from_dsc();
+ runcmd qw(git reset --hard), $newhash;
}
+ print "ready for work in $dstdir\n";
}
sub fetch () {
- my ($archive_or_mirror, $suite, $package) = @_;
- my $dsc = get_archive_dsc();
- with_tmpdir($td,{
-
- });
+}
+
+sub push () {
+ runcmd qw(git 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 = mktree_in_ud_from_only_subdir();
+ chdir '../../../..' or die $!;
+ runcmd qw(git diff --exit-code), $tree;
+ runcmd qw(git fetch), $alioth_git,
+ map { "$_:refs/remotes/$remotename/$_" }
+ (mainbranch(), uploadbranch());
+ die <<END;
+ if (!is_fast_fwd(mainbranch
+xxx introduce remote_lref
+xxx use remote_lref everywhere
+
+fetch from alioth
+do fast forward check and maybe fake merge
+push to uploading
+dput
+push to main
+END
+}
+
+sub cmd_clone {
+ if (@ARGV==1) {
+ ($package) = @ARGV;
+ } elsif (@ARGV==2) {
+ ($package,$suite) = @ARGV;
+ } else {
+ die;
+ }
+ clone();
+}
+
+sub parseopts () {
+ die if @ARGV && $ARGV[0] =~ m/^\-/;
+}
+
+parseopts();
+die unless @ARGV;
+my $cmd = shift @ARGV;
+parseopts();
-print Dumper(get_archive_dsc());
+{ no strict qw(refs); &{"cmd_$cmd"}(); }
~ianmdlvl / dgit.git / blobdiff