From eeb4770ff4b9a82b4cad0388c6ca165044aaa5d8 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Tue, 13 Aug 2013 19:14:21 +0100
Subject: [PATCH] wip

---
 dgit | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 87 insertions(+), 7 deletions(-)

diff --git a/dgit b/dgit
index 84122dca..9411afc0 100755
--- a/dgit
+++ b/dgit
@@ -5,6 +5,8 @@ use IO::Handle;
 use Data::Dumper;
 use LWP::UserAgent;
 use Dpkg::Control::Hash;
+use File::Path;
+use POSIX;
 
 open DEBUG, ">&STDERR" or die $!;
 
@@ -34,6 +36,8 @@ print DEBUG "fetching @_...\n";
     return $r->decoded_content();
 }
 
+our ($dscdata,$dscurl);
+
 sub get_archive_dsc () {
     my $pdourl = "$pdo/source/$suite/$package";
     my $pdodata = url_get($pdourl);
@@ -45,9 +49,9 @@ sub get_archive_dsc () {
         \<a\ href=\"([^"&]+([^"/]+\.dsc))\"\>\2\</a\>
     }msx
         or die "screenscraping of $pdourl failed :-(\n";
-    my $dscurl = $1;
+    $dscurl = $1;
 print DEBUG Dumper($pdodata, $&, $dscurl);
-    my $dscdata = url_get($dscurl);
+    $dscdata = url_get($dscurl);
     my $dscfh = new IO::File \$dscdata, '<' or die $!;
 print DEBUG Dumper($dscdata, $dscfh);
     my $dscp = Dpkg::Control::Hash->new(allow_pgp=>1);
@@ -78,11 +82,87 @@ sub runcmd {
     die "$! $?" if system @_;
 }
 
-our ($dsc,$dsc_hash);
+our ($dsc,$dsc_hash,$lastupl_hash);
+
+sub generate_commit_from_dsc () {
+    my $ud = '.git/dgit/unpack';
+    remove_tree($ud);
+    mkpath '.git/dgit';
+    mkdir $ud or die $!;
+    chdir $ud or die $!;
+    my @files;
+    foreach (split /\n/, ($dsch->{Checksums-Sha256} || $dsch->{Files})) {
+	next unless m/\S/;
+	m/^\w+ \d+ (\S+)$/ 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 --), $dscurl;
+    foreach my $f (grep { m/\.tar\.gz$/ } @files) {
+	link $f, "../../../$f"
+	    or $!==&EEXIST
+	    or die "$f $!";
+    }
+    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);
+    remove_tree(.git/objects);
+    symlink '../../objects','.git/objects' or die $!;
+    runcmd qw(git add -Af);
+    my $tree = cmdoutput qw(git write-tree);
+    chomp $tree or die;
+    runcmd qw(sh -ec), 'dpkg-parsechangelog >../changelog.tmp';
+    my $clogp = Dpkg::Control::Hash->new();
+    $clogp->parse('../changelog.tmp','changelog');
+    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}
+# generated by dgit
+END
+    close C or die $!;
+    my $commithash = runcmd qw(git hash-object -w -t commit ../commit.tmp);
+    chdir '../../..' or die $!;
+    remove_tree($ud);
+    cmdoutput qw(git log -n1), $commithash;
+    return $commithash;
+}
+
+sub fetch_from_archive () {
+    my $hash;
+    if (defined $dsc_hash) {
+	$hash = $dsc_hash;
+    } else {
+	$hash = generate_commit_from_dsc();
+    }
+    cmdoutput qw(git update-ref FETCH_HEAD) $hash;
+}
 
 #sub combine () {
-#    if (!defined $dsc_hash) {
-#	runcmd qw(mkdir -p .git/dgit/unpack);
+#    if (
+	
+#	runcmd qw(git write-tree
+	
+	
+	runcmd qw(mkdir -p '');
 #	chdir '.git/dgit/unpack' or die $!;
 	
 	
@@ -108,7 +188,7 @@ sub clone () {
 	runcmd qw(git clone --origin dgit -b), $suite, '--',
 	    $alioth_git, $dstdir;
 	chdir "$dstdir" or die "$dstdir $!";
-	combine();
+	update_from_archive();
     } else {
 	mkdir $dstdir or die "$dstdir $!";
 	chdir "$dstdir" or die "$dstdir $!";
@@ -119,7 +199,7 @@ sub clone () {
 	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();
+	update_from_archive();
     }
 }
 
-- 
2.30.2