#!/usr/bin/perl -w

# This tool is copyright (c) 2005, Matthias Urlichs.
# It is released under the Gnu Public License, version 2.
#
# The basic idea is to pull and analyze SVN changes.
#
# Checking out the files is done by a single long-running SVN connection.
#
# The head revision is on branch "origin" by default.
# You can change that with the '-o' option.

use strict;
use warnings;
use Getopt::Std;
use File::Copy;
use File::Spec;
use File::Temp qw(tempfile);
use File::Path qw(mkpath);
use File::Basename qw(basename dirname);
use Time::Local;
use IO::Pipe;
use POSIX qw(strftime dup2);
use IPC::Open2;
use SVN::Core;
use SVN::Ra;

die "Need SVN:Core 1.2.1 or better" if $SVN::Core::VERSION lt "1.2.1";

$SIG{'PIPE'}="IGNORE";
$ENV{'TZ'}="UTC";

our($opt_h,$opt_o,$opt_v,$opt_u,$opt_C,$opt_i,$opt_m,$opt_M,$opt_t,$opt_T,
    $opt_b,$opt_r,$opt_I,$opt_A,$opt_s,$opt_l,$opt_d,$opt_D,$opt_S,$opt_F,
    $opt_P,$opt_R);

sub usage() {
        print STDERR <<END;
Usage: ${\basename $0}     # fetch/update GIT from SVN
       [-o branch-for-HEAD] [-h] [-v] [-l max_rev] [-R repack_each_revs]
       [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
       [-d|-D] [-i] [-u] [-r] [-I ignorefilename] [-s start_chg]
       [-m] [-M regex] [-A author_file] [-S] [-F] [-P project_name] [SVN_URL]
END
        exit(1);
}

getopts("A:b:C:dDFhiI:l:mM:o:rs:t:T:SP:R:uv") or usage();
usage if $opt_h;

my $tag_name = $opt_t || "tags";
my $trunk_name = defined $opt_T ? $opt_T : "trunk";
my $branch_name = $opt_b || "branches";
my $project_name = $opt_P || "";
$project_name = "/" . $project_name if ($project_name);
my $repack_after = $opt_R || 1000;
my $root_pool = SVN::Pool->new_default;

@ARGV == 1 or @ARGV == 2 or usage();

$opt_o ||= "origin";
$opt_s ||= 1;
my $git_tree = $opt_C;
$git_tree ||= ".";

my $svn_url = $ARGV[0];
my $svn_dir = $ARGV[1];

our @mergerx = ();
if ($opt_m) {
        my $branch_esc = quotemeta ($branch_name);
        my $trunk_esc  = quotemeta ($trunk_name);
        @mergerx =
        (
                qr!\b(?:merg(?:ed?|ing))\b.*?\b((?:(?<=$branch_esc/)[\w\.\-]+)|(?:$trunk_esc))\b!i,
                qr!\b(?:from|of)\W+((?:(?<=$branch_esc/)[\w\.\-]+)|(?:$trunk_esc))\b!i,
                qr!\b(?:from|of)\W+(?:the )?([\w\.\-]+)[-\s]branch\b!i
        );
}
if ($opt_M) {
        unshift (@mergerx, qr/$opt_M/);
}

# Absolutize filename now, since we will have chdir'ed by the time we
# get around to opening it.
$opt_A = File::Spec->rel2abs($opt_A) if $opt_A;

our %users = ();
our $users_file = undef;
sub read_users($) {
        $users_file = File::Spec->rel2abs(@_);
        die "Cannot open $users_file\n" unless -f $users_file;
        open(my $authors,$users_file);
        while(<$authors>) {
                chomp;
                next unless /^(\S+?)\s*=\s*(.+?)\s*<(.+)>\s*$/;
                (my $user,my $name,my $email) = ($1,$2,$3);
                $users{$user} = [$name,$email];
        }
        close($authors);
}

select(STDERR); $|=1; select(STDOUT);


package SVNconn;
# Basic SVN connection.
# We're only interested in connecting and downloading, so ...

use File::Spec;
use File::Temp qw(tempfile);
use POSIX qw(strftime dup2);
use Fcntl qw(SEEK_SET);

sub new {
        my($what,$repo) = @_;
        $what=ref($what) if ref($what);

        my $self = {};
        $self->{'buffer'} = "";
        bless($self,$what);

        $repo =~ s#/+$##;
        $self->{'fullrep'} = $repo;
        $self->conn();

        return $self;
}

sub conn {
        my $self = shift;
        my $repo = $self->{'fullrep'};
        my $auth = SVN::Core::auth_open ([SVN::Client::get_simple_provider,
                          SVN::Client::get_ssl_server_trust_file_provider,
                          SVN::Client::get_username_provider]);
        my $s = SVN::Ra->new(url => $repo, auth => $auth, pool => $root_pool);
        die "SVN connection to $repo: $!\n" unless defined $s;
        $self->{'svn'} = $s;
        $self->{'repo'} = $repo;
        $self->{'maxrev'} = $s->get_latest_revnum();
}

sub file {
        my($self,$path,$rev) = @_;

        my ($fh, $name) = tempfile('gitsvn.XXXXXX',
                    DIR => File::Spec->tmpdir(), UNLINK => 1);

        print "... $rev $path ...\n" if $opt_v;
        my (undef, $properties);
        $path =~ s#^/*##;
        my $subpool = SVN::Pool::new_default_sub;
        eval { (undef, $properties)
                   = $self->{'svn'}->get_file($path,$rev,$fh); };
        if($@) {
                return undef if $@ =~ /Attempted to get checksum/;
                die $@;
        }
        my $mode;
        if (exists $properties->{'svn:executable'}) {
                $mode = '100755';
        } elsif (exists $properties->{'svn:special'}) {
                my ($special_content, $filesize);
                $filesize = tell $fh;
                seek $fh, 0, SEEK_SET;
                read $fh, $special_content, $filesize;
                if ($special_content =~ s/^link //) {
                        $mode = '120000';
                        seek $fh, 0, SEEK_SET;
                        truncate $fh, 0;
                        print $fh $special_content;
                } else {
                        die "unexpected svn:special file encountered";
                }
        } else {
                $mode = '100644';
        }
        close ($fh);

        return ($name, $mode);
}

sub ignore {
        my($self,$path,$rev) = @_;

        print "... $rev $path ...\n" if $opt_v;
        $path =~ s#^/*##;
        my $subpool = SVN::Pool::new_default_sub;
        my (undef,undef,$properties)
            = $self->{'svn'}->get_dir($path,$rev,undef);
        if (exists $properties->{'svn:ignore'}) {
                my ($fh, $name) = tempfile('gitsvn.XXXXXX',
                                           DIR => File::Spec->tmpdir(),
                                           UNLINK => 1);
                print $fh $properties->{'svn:ignore'};
                close($fh);
                return $name;
        } else {
                return undef;
        }
}

sub dir_list {
        my($self,$path,$rev) = @_;
        $path =~ s#^/*##;
        my $subpool = SVN::Pool::new_default_sub;
        my ($dirents,undef,$properties)
            = $self->{'svn'}->get_dir($path,$rev,undef);
        return $dirents;
}

package main;
use URI;

our $svn = $svn_url;
$svn .= "/$svn_dir" if defined $svn_dir;
my $svn2 = SVNconn->new($svn);
$svn = SVNconn->new($svn);

my $lwp_ua;
if($opt_d or $opt_D) {
        $svn_url = URI->new($svn_url)->canonical;
        if($opt_D) {
                $svn_dir =~ s#/*$#/#;
        } else {
                $svn_dir = "";
        }
        if ($svn_url->scheme eq "http") {
                use LWP::UserAgent;
                $lwp_ua = LWP::UserAgent->new(keep_alive => 1, requests_redirectable => []);
        } else {
                print STDERR "Warning: not HTTP; turning off direct file access\n";
                $opt_d=0;
        }
}

sub pdate($) {
        my($d) = @_;
        $d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
                or die "Unparseable date: $d\n";
        my $y=$1; $y-=1900 if $y>1900;
        return timegm($6||0,$5,$4,$3,$2-1,$y);
}

sub getwd() {
        my $pwd = `pwd`;
        chomp $pwd;
        return $pwd;
}


sub get_headref($$) {
    my $name    = shift;
    my $git_dir = shift;
    my $sha;

    if (open(C,"$git_dir/refs/heads/$name")) {
        chomp($sha = <C>);
        close(C);
        length($sha) == 40
            or die "Cannot get head id for $name ($sha): $!\n";
    }
    return $sha;
}


-d $git_tree
        or mkdir($git_tree,0777)
        or die "Could not create $git_tree: $!";
chdir($git_tree);

my $orig_branch = "";
my $forward_master = 0;
my %branches;

my $git_dir = $ENV{"GIT_DIR"} || ".git";
$git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
$ENV{"GIT_DIR"} = $git_dir;
my $orig_git_index;
$orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
                                    DIR => File::Spec->tmpdir());
close ($git_ih);
$ENV{GIT_INDEX_FILE} = $git_index;
my $maxnum = 0;
my $last_rev = "";
my $last_branch;
my $current_rev = $opt_s || 1;
unless(-d $git_dir) {
        system("git init");
        die "Cannot init the GIT db at $git_tree: $?\n" if $?;
        system("git read-tree");
        die "Cannot init an empty tree: $?\n" if $?;

        $last_branch = $opt_o;
        $orig_branch = "";
} else {
        -f "$git_dir/refs/heads/$opt_o"
                or die "Branch '$opt_o' does not exist.\n".
                       "Either use the correct '-o branch' option,\n".
                       "or import to a new repository.\n";

        -f "$git_dir/svn2git"
                or die "'$git_dir/svn2git' does not exist.\n".
                       "You need that file for incremental imports.\n";
        open(F, "git symbolic-ref HEAD |") or
                die "Cannot run git-symbolic-ref: $!\n";
        chomp ($last_branch = <F>);
        $last_branch = basename($last_branch);
        close(F);
        unless($last_branch) {
                warn "Cannot read the last branch name: $! -- assuming 'master'\n";
                $last_branch = "master";
        }
        $orig_branch = $last_branch;
        $last_rev = get_headref($orig_branch, $git_dir);
        if (-f "$git_dir/SVN2GIT_HEAD") {
                die <<EOM;
SVN2GIT_HEAD exists.
Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
You may need to run

    git-read-tree -m -u SVN2GIT_HEAD HEAD
EOM
        }
        system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");

        $forward_master =
            $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
            system('cmp', '-s', "$git_dir/refs/heads/master",
                                "$git_dir/refs/heads/$opt_o") == 0;

        # populate index
        system('git', 'read-tree', $last_rev);
        die "read-tree failed: $?\n" if $?;

        # Get the last import timestamps
        open my $B,"<", "$git_dir/svn2git";
        while(<$B>) {
                chomp;
                my($num,$branch,$ref) = split;
                $branches{$branch}{$num} = $ref;
                $branches{$branch}{"LAST"} = $ref;
                $current_rev = $num+1 if $current_rev <= $num;
        }
        close($B);
}
-d $git_dir
        or die "Could not create git subdir ($git_dir).\n";

my $default_authors = "$git_dir/svn-authors";
if ($opt_A) {
        read_users($opt_A);
        copy($opt_A,$default_authors) or die "Copy failed: $!";
} else {
        read_users($default_authors) if -f $default_authors;
}

open BRANCHES,">>", "$git_dir/svn2git";

sub node_kind($$) {
        my ($svnpath, $revision) = @_;
        $svnpath =~ s#^/*##;
        my $subpool = SVN::Pool::new_default_sub;
        my $kind = $svn->{'svn'}->check_path($svnpath,$revision);
        return $kind;
}

sub get_file($$$) {
        my($svnpath,$rev,$path) = @_;

        # now get it
        my ($name,$mode);
        if($opt_d) {
                my($req,$res);

                # /svn/!svn/bc/2/django/trunk/django-docs/build.py
                my $url=$svn_url->clone();
                $url->path($url->path."/!svn/bc/$rev/$svn_dir$svnpath");
                print "... $path...\n" if $opt_v;
                $req = HTTP::Request->new(GET => $url);
                $res = $lwp_ua->request($req);
                if ($res->is_success) {
                        my $fh;
                        ($fh, $name) = tempfile('gitsvn.XXXXXX',
                        DIR => File::Spec->tmpdir(), UNLINK => 1);
                        print $fh $res->content;
                        close($fh) or die "Could not write $name: $!\n";
                } else {
                        return undef if $res->code == 301; # directory?
                        die $res->status_line." at $url\n";
                }
                $mode = '0644'; # can't obtain mode via direct http request?
        } else {
                ($name,$mode) = $svn->file("$svnpath",$rev);
                return undef unless defined $name;
        }

        my $pid = open(my $F, '-|');
        die $! unless defined $pid;
        if (!$pid) {
            exec("git", "hash-object", "-w", $name)
                or die "Cannot create object: $!\n";
        }
        my $sha = <$F>;
        chomp $sha;
        close $F;
        unlink $name;
        return [$mode, $sha, $path];
}

sub get_ignore($$$$$) {
        my($new,$old,$rev,$path,$svnpath) = @_;

        return unless $opt_I;
        my $name = $svn->ignore("$svnpath",$rev);
        if ($path eq '/') {
                $path = $opt_I;
        } else {
                $path = File::Spec->catfile($path,$opt_I);
        }
        if (defined $name) {
                my $pid = open(my $F, '-|');
                die $! unless defined $pid;
                if (!$pid) {
                        exec("git", "hash-object", "-w", $name)
                            or die "Cannot create object: $!\n";
                }
                my $sha = <$F>;
                chomp $sha;
                close $F;
                unlink $name;
                push(@$new,['0644',$sha,$path]);
        } elsif (defined $old) {
                push(@$old,$path);
        }
}

sub project_path($$)
{
        my ($path, $project) = @_;

        $path = "/".$path unless ($path =~ m#^\/#) ;
        return $1 if ($path =~ m#^$project\/(.*)$#);

        $path =~ s#\.#\\\.#g;
        $path =~ s#\+#\\\+#g;
        return "/" if ($project =~ m#^$path.*$#);

        return undef;
}

sub split_path($$) {
        my($rev,$path) = @_;
        my $branch;

        if($path =~ s#^/\Q$tag_name\E/([^/]+)/?##) {
                $branch = "/$1";
        } elsif($path =~ s#^/\Q$trunk_name\E/?##) {
                $branch = "/";
        } elsif($path =~ s#^/\Q$branch_name\E/([^/]+)/?##) {
                $branch = $1;
        } else {
                my %no_error = (
                        "/" => 1,
                        "/$tag_name" => 1,
                        "/$branch_name" => 1
                );
                print STDERR "$rev: Unrecognized path: $path\n" unless (defined $no_error{$path});
                return ()
        }
        if ($path eq "") {
                $path = "/";
        } elsif ($project_name) {
                $path = project_path($path, $project_name);
        }
        return ($branch,$path);
}

sub branch_rev($$) {

        my ($srcbranch,$uptorev) = @_;

        my $bbranches = $branches{$srcbranch};
        my @revs = reverse sort { ($a eq 'LAST' ? 0 : $a) <=> ($b eq 'LAST' ? 0 : $b) } keys %$bbranches;
        my $therev;
        foreach my $arev(@revs) {
                next if  ($arev eq 'LAST');
                if ($arev <= $uptorev) {
                        $therev = $arev;
                        last;
                }
        }
        return $therev;
}

sub expand_svndir($$$);

sub expand_svndir($$$)
{
        my ($svnpath, $rev, $path) = @_;
        my @list;
        get_ignore(\@list, undef, $rev, $path, $svnpath);
        my $dirents = $svn->dir_list($svnpath, $rev);
        foreach my $p(keys %$dirents) {
                my $kind = node_kind($svnpath.'/'.$p, $rev);
                if ($kind eq $SVN::Node::file) {
                        my $f = get_file($svnpath.'/'.$p, $rev, $path.'/'.$p);
                        push(@list, $f) if $f;
                } elsif ($kind eq $SVN::Node::dir) {
                        push(@list,
                             expand_svndir($svnpath.'/'.$p, $rev, $path.'/'.$p));
                }
        }
        return @list;
}

sub copy_path($$$$$$$$) {
        # Somebody copied a whole subdirectory.
        # We need to find the index entries from the old version which the
        # SVN log entry points to, and add them to the new place.

        my($newrev,$newbranch,$path,$oldpath,$rev,$node_kind,$new,$parents) = @_;

        my($srcbranch,$srcpath) = split_path($rev,$oldpath);
        unless(defined $srcbranch && defined $srcpath) {
                print "Path not found when copying from $oldpath @ $rev.\n".
                        "Will try to copy from original SVN location...\n"
                        if $opt_v;
                push (@$new, expand_svndir($oldpath, $rev, $path));
                return;
        }
        my $therev = branch_rev($srcbranch, $rev);
        my $gitrev = $branches{$srcbranch}{$therev};
        unless($gitrev) {
                print STDERR "$newrev:$newbranch: could not find $oldpath \@ $rev\n";
                return;
        }
        if ($srcbranch ne $newbranch) {
                push(@$parents, $branches{$srcbranch}{'LAST'});
        }
        print "$newrev:$newbranch:$path: copying from $srcbranch:$srcpath @ $rev\n" if $opt_v;
        if ($node_kind eq $SVN::Node::dir) {
                $srcpath =~ s#/*$#/#;
        }

        my $pid = open my $f,'-|';
        die $! unless defined $pid;
        if (!$pid) {
                exec("git","ls-tree","-r","-z",$gitrev,$srcpath)
                        or die $!;
        }
        local $/ = "\0";
        while(<$f>) {
                chomp;
                my($m,$p) = split(/\t/,$_,2);
                my($mode,$type,$sha1) = split(/ /,$m);
                next if $type ne "blob";
                if ($node_kind eq $SVN::Node::dir) {
                        $p = $path . substr($p,length($srcpath)-1);
                } else {
                        $p = $path;
                }
                push(@$new,[$mode,$sha1,$p]);
        }
        close($f) or
                print STDERR "$newrev:$newbranch: could not list files in $oldpath \@ $rev\n";
}

sub commit {
        my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
        my($committer_name,$committer_email,$dest);
        my($author_name,$author_email);
        my(@old,@new,@parents);

        if (not defined $author or $author eq "") {
                $committer_name = $committer_email = "unknown";
        } elsif (defined $users_file) {
                die "User $author is not listed in $users_file\n"
                    unless exists $users{$author};
                ($committer_name,$committer_email) = @{$users{$author}};
        } elsif ($author =~ /^(.*?)\s+<(.*)>$/) {
                ($committer_name, $committer_email) = ($1, $2);
        } else {
                $author =~ s/^<(.*)>$/$1/;
                $committer_name = $committer_email = $author;
        }

        if ($opt_F && $message =~ /From:\s+(.*?)\s+<(.*)>\s*\n/) {
                ($author_name, $author_email) = ($1, $2);
                print "Author from From: $1 <$2>\n" if ($opt_v);;
        } elsif ($opt_S && $message =~ /Signed-off-by:\s+(.*?)\s+<(.*)>\s*\n/) {
                ($author_name, $author_email) = ($1, $2);
                print "Author from Signed-off-by: $1 <$2>\n" if ($opt_v);;
        } else {
                $author_name = $committer_name;
                $author_email = $committer_email;
        }

        $date = pdate($date);

        my $tag;
        my $parent;
        if($branch eq "/") { # trunk
                $parent = $opt_o;
        } elsif($branch =~ m#^/(.+)#) { # tag
                $tag = 1;
                $parent = $1;
        } else { # "normal" branch
                # nothing to do
                $parent = $branch;
        }
        $dest = $parent;

        my $prev = $changed_paths->{"/"};
        if($prev and $prev->[0] eq "A") {
                delete $changed_paths->{"/"};
                my $oldpath = $prev->[1];
                my $rev;
                if(defined $oldpath) {
                        my $p;
                        ($parent,$p) = split_path($revision,$oldpath);
                        if(defined $parent) {
                                if($parent eq "/") {
                                        $parent = $opt_o;
                                } else {
                                        $parent =~ s#^/##; # if it's a tag
                                }
                        }
                } else {
                        $parent = undef;
                }
        }

        my $rev;
        if($revision > $opt_s and defined $parent) {
                open(H,'-|',"git","rev-parse","--verify",$parent);
                $rev = <H>;
                close(H) or do {
                        print STDERR "$revision: cannot find commit '$parent'!\n";
                        return;
                };
                chop $rev;
                if(length($rev) != 40) {
                        print STDERR "$revision: cannot find commit '$parent'!\n";
                        return;
                }
                $rev = $branches{($parent eq $opt_o) ? "/" : $parent}{"LAST"};
                if($revision != $opt_s and not $rev) {
                        print STDERR "$revision: do not know ancestor for '$parent'!\n";
                        return;
                }
        } else {
                $rev = undef;
        }

#       if($prev and $prev->[0] eq "A") {
#               if(not $tag) {
#                       unless(open(H,"> $git_dir/refs/heads/$branch")) {
#                               print STDERR "$revision: Could not create branch $branch: $!\n";
#                               $state=11;
#                               next;
#                       }
#                       print H "$rev\n"
#                               or die "Could not write branch $branch: $!";
#                       close(H)
#                               or die "Could not write branch $branch: $!";
#               }
#       }
        if(not defined $rev) {
                unlink($git_index);
        } elsif ($rev ne $last_rev) {
                print "Switching from $last_rev to $rev ($branch)\n" if $opt_v;
                system("git", "read-tree", $rev);
                die "read-tree failed for $rev: $?\n" if $?;
                $last_rev = $rev;
        }

        push (@parents, $rev) if defined $rev;

        my $cid;
        if($tag and not %$changed_paths) {
                $cid = $rev;
        } else {
                my @paths = sort keys %$changed_paths;
                foreach my $path(@paths) {
                        my $action = $changed_paths->{$path};

                        if ($action->[0] eq "R") {
                                # refer to a file/tree in an earlier commit
                                push(@old,$path); # remove any old stuff
                        }
                        if(($action->[0] eq "A") || ($action->[0] eq "R")) {
                                my $node_kind = node_kind($action->[3], $revision);
                                if ($node_kind eq $SVN::Node::file) {
                                        my $f = get_file($action->[3],
                                                         $revision, $path);
                                        if ($f) {
                                                push(@new,$f) if $f;
                                        } else {
                                                my $opath = $action->[3];
                                                print STDERR "$revision: $branch: could not fetch '$opath'\n";
                                        }
                                } elsif ($node_kind eq $SVN::Node::dir) {
                                        if($action->[1]) {
                                                copy_path($revision, $branch,
                                                          $path, $action->[1],
                                                          $action->[2], $node_kind,
                                                          \@new, \@parents);
                                        } else {
                                                get_ignore(\@new, \@old, $revision,
                                                           $path, $action->[3]);
                                        }
                                }
                        } elsif ($action->[0] eq "D") {
                                push(@old,$path);
                        } elsif ($action->[0] eq "M") {
                                my $node_kind = node_kind($action->[3], $revision);
                                if ($node_kind eq $SVN::Node::file) {
                                        my $f = get_file($action->[3],
                                                         $revision, $path);
                                        push(@new,$f) if $f;
                                } elsif ($node_kind eq $SVN::Node::dir) {
                                        get_ignore(\@new, \@old, $revision,
                                                   $path, $action->[3]);
                                }
                        } else {
                                die "$revision: unknown action '".$action->[0]."' for $path\n";
                        }
                }

                while(@old) {
                        my @o1;
                        if(@old > 55) {
                                @o1 = splice(@old,0,50);
                        } else {
                                @o1 = @old;
                                @old = ();
                        }
                        my $pid = open my $F, "-|";
                        die "$!" unless defined $pid;
                        if (!$pid) {
                                exec("git", "ls-files", "-z", @o1) or die $!;
                        }
                        @o1 = ();
                        local $/ = "\0";
                        while(<$F>) {
                                chomp;
                                push(@o1,$_);
                        }
                        close($F);

                        while(@o1) {
                                my @o2;
                                if(@o1 > 55) {
                                        @o2 = splice(@o1,0,50);
                                } else {
                                        @o2 = @o1;
                                        @o1 = ();
                                }
                                system("git","update-index","--force-remove","--",@o2);
                                die "Cannot remove files: $?\n" if $?;
                        }
                }
                while(@new) {
                        my @n2;
                        if(@new > 12) {
                                @n2 = splice(@new,0,10);
                        } else {
                                @n2 = @new;
                                @new = ();
                        }
                        system("git","update-index","--add",
                                (map { ('--cacheinfo', @$_) } @n2));
                        die "Cannot add files: $?\n" if $?;
                }

                my $pid = open(C,"-|");
                die "Cannot fork: $!" unless defined $pid;
                unless($pid) {
                        exec("git","write-tree");
                        die "Cannot exec git-write-tree: $!\n";
                }
                chomp(my $tree = <C>);
                length($tree) == 40
                        or die "Cannot get tree id ($tree): $!\n";
                close(C)
                        or die "Error running git-write-tree: $?\n";
                print "Tree ID $tree\n" if $opt_v;

                my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
                my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
                $pid = fork();
                die "Fork: $!\n" unless defined $pid;
                unless($pid) {
                        $pr->writer();
                        $pw->reader();
                        open(OUT,">&STDOUT");
                        dup2($pw->fileno(),0);
                        dup2($pr->fileno(),1);
                        $pr->close();
                        $pw->close();

                        my @par = ();

                        # loose detection of merges
                        # based on the commit msg
                        foreach my $rx (@mergerx) {
                                if ($message =~ $rx) {
                                        my $mparent = $1;
                                        if ($mparent eq 'HEAD') { $mparent = $opt_o };
                                        if ( -e "$git_dir/refs/heads/$mparent") {
                                                $mparent = get_headref($mparent, $git_dir);
                                                push (@parents, $mparent);
                                                print OUT "Merge parent branch: $mparent\n" if $opt_v;
                                        }
                                }
                        }
                        my %seen_parents = ();
                        my @unique_parents = grep { ! $seen_parents{$_} ++ } @parents;
                        foreach my $bparent (@unique_parents) {
                                push @par, '-p', $bparent;
                                print OUT "Merge parent branch: $bparent\n" if $opt_v;
                        }

                        exec("env",
                                "GIT_AUTHOR_NAME=$author_name",
                                "GIT_AUTHOR_EMAIL=$author_email",
                                "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
                                "GIT_COMMITTER_NAME=$committer_name",
                                "GIT_COMMITTER_EMAIL=$committer_email",
                                "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
                                "git", "commit-tree", $tree,@par);
                        die "Cannot exec git-commit-tree: $!\n";
                }
                $pw->writer();
                $pr->reader();

                $message =~ s/[\s\n]+\z//;
                $message = "r$revision: $message" if $opt_r;

                print $pw "$message\n"
                        or die "Error writing to git-commit-tree: $!\n";
                $pw->close();

                print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
                chomp($cid = <$pr>);
                length($cid) == 40
                        or die "Cannot get commit id ($cid): $!\n";
                print "Commit ID $cid\n" if $opt_v;
                $pr->close();

                waitpid($pid,0);
                die "Error running git-commit-tree: $?\n" if $?;
        }

        if (not defined $cid) {
                $cid = $branches{"/"}{"LAST"};
        }

        if(not defined $dest) {
                print "... no known parent\n" if $opt_v;
        } elsif(not $tag) {
                print "Writing to refs/heads/$dest\n" if $opt_v;
                open(C,">$git_dir/refs/heads/$dest") and
                print C ("$cid\n") and
                close(C)
                        or die "Cannot write branch $dest for update: $!\n";
        }

        if ($tag) {
                $last_rev = "-" if %$changed_paths;
                # the tag was 'complex', i.e. did not refer to a "real" revision

                $dest =~ tr/_/\./ if $opt_u;

                system('git', 'tag', '-f', $dest, $cid) == 0
                        or die "Cannot create tag $dest: $!\n";

                print "Created tag '$dest' on '$branch'\n" if $opt_v;
        }
        $branches{$branch}{"LAST"} = $cid;
        $branches{$branch}{$revision} = $cid;
        $last_rev = $cid;
        print BRANCHES "$revision $branch $cid\n";
        print "DONE: $revision $dest $cid\n" if $opt_v;
}

sub commit_all {
        # Recursive use of the SVN connection does not work
        local $svn = $svn2;

        my ($changed_paths, $revision, $author, $date, $message) = @_;
        my %p;
        while(my($path,$action) = each %$changed_paths) {
                $p{$path} = [ $action->action,$action->copyfrom_path, $action->copyfrom_rev, $path ];
        }
        $changed_paths = \%p;

        my %done;
        my @col;
        my $pref;
        my $branch;

        while(my($path,$action) = each %$changed_paths) {
                ($branch,$path) = split_path($revision,$path);
                next if not defined $branch;
                next if not defined $path;
                $done{$branch}{$path} = $action;
        }
        while(($branch,$changed_paths) = each %done) {
                commit($branch, $changed_paths, $revision, $author, $date, $message);
        }
}

$opt_l = $svn->{'maxrev'} if not defined $opt_l or $opt_l > $svn->{'maxrev'};

if ($opt_l < $current_rev) {
    print "Up to date: no new revisions to fetch!\n" if $opt_v;
    unlink("$git_dir/SVN2GIT_HEAD");
    exit;
}

print "Processing from $current_rev to $opt_l ...\n" if $opt_v;

my $from_rev;
my $to_rev = $current_rev - 1;

my $subpool = SVN::Pool::new_default_sub;
while ($to_rev < $opt_l) {
        $subpool->clear;
        $from_rev = $to_rev + 1;
        $to_rev = $from_rev + $repack_after;
        $to_rev = $opt_l if $opt_l < $to_rev;
        print "Fetching from $from_rev to $to_rev ...\n" if $opt_v;
        $svn->{'svn'}->get_log("",$from_rev,$to_rev,0,1,1,\&commit_all);
        my $pid = fork();
        die "Fork: $!\n" unless defined $pid;
        unless($pid) {
                exec("git", "repack", "-d")
                        or die "Cannot repack: $!\n";
        }
        waitpid($pid, 0);
}


unlink($git_index);

if (defined $orig_git_index) {
        $ENV{GIT_INDEX_FILE} = $orig_git_index;
} else {
        delete $ENV{GIT_INDEX_FILE};
}

# Now switch back to the branch we were in before all of this happened
if($orig_branch) {
        print "DONE\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
        system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
                if $forward_master;
        unless ($opt_i) {
                system('git', 'read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
                die "read-tree failed: $?\n" if $?;
        }
} else {
        $orig_branch = "master";
        print "DONE; creating $orig_branch branch\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
        system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
                unless -f "$git_dir/refs/heads/master";
        system('git', 'update-ref', 'HEAD', "$orig_branch");
        unless ($opt_i) {
                system('git checkout');
                die "checkout failed: $?\n" if $?;
        }
}
unlink("$git_dir/SVN2GIT_HEAD");
close(BRANCHES);