/bin/git-folder/git-svn

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#!/usr/bin/perl
use lib (split(/:/, $ENV{GITPERLLIB} || "/home/pcheah/local/share/perl/5.12.4"));
# Copyright (C) 2006, Eric Wong <normalperson@yhbt.net>
# License: GPL v2 or later
use 5.008;
use warnings;
use strict;
use vars qw/	$AUTHOR $VERSION
		$sha1 $sha1_short $_revision $_repository
		$_q $_authors $_authors_prog %users/;
$AUTHOR = 'Eric Wong <normalperson@yhbt.net>';
$VERSION = '1.7.7.2';

# From which subdir have we been invoked?
my $cmd_dir_prefix = eval {
	command_oneline([qw/rev-parse --show-prefix/], STDERR => 0)
} || '';

my $git_dir_user_set = 1 if defined $ENV{GIT_DIR};
$ENV{GIT_DIR} ||= '.git';
$Git::SVN::default_repo_id = 'svn';
$Git::SVN::default_ref_id = $ENV{GIT_SVN_ID} || 'git-svn';
$Git::SVN::Ra::_log_window_size = 100;
$Git::SVN::_minimize_url = 'unset';

if (! exists $ENV{SVN_SSH}) {
	if (exists $ENV{GIT_SSH}) {
		$ENV{SVN_SSH} = $ENV{GIT_SSH};
		if ($^O eq 'msys') {
			$ENV{SVN_SSH} =~ s/\\/\\\\/g;
			$ENV{SVN_SSH} =~ s/(.*)/"$1"/;
		}
	}
}

$Git::SVN::Log::TZ = $ENV{TZ};
$ENV{TZ} = 'UTC';
$| = 1; # unbuffer STDOUT

sub fatal (@) { print STDERR "@_\n"; exit 1 }
sub _req_svn {
	require SVN::Core; # use()-ing this causes segfaults for me... *shrug*
	require SVN::Ra;
	require SVN::Delta;
	if ($SVN::Core::VERSION lt '1.1.0') {
		fatal "Need SVN::Core 1.1.0 or better (got $SVN::Core::VERSION)";
	}
}
my $can_compress = eval { require Compress::Zlib; 1};
push @Git::SVN::Ra::ISA, 'SVN::Ra';
push @SVN::Git::Editor::ISA, 'SVN::Delta::Editor';
push @SVN::Git::Fetcher::ISA, 'SVN::Delta::Editor';
use Carp qw/croak/;
use Digest::MD5;
use IO::File qw//;
use File::Basename qw/dirname basename/;
use File::Path qw/mkpath/;
use File::Spec;
use File::Find;
use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
use IPC::Open3;
use Git;
use Memoize;  # core since 5.8.0, Jul 2002

BEGIN {
	# import functions from Git into our packages, en masse
	no strict 'refs';
	foreach (qw/command command_oneline command_noisy command_output_pipe
	            command_input_pipe command_close_pipe
	            command_bidi_pipe command_close_bidi_pipe/) {
		for my $package ( qw(SVN::Git::Editor SVN::Git::Fetcher
			Git::SVN::Migration Git::SVN::Log Git::SVN),
			__PACKAGE__) {
			*{"${package}::$_"} = \&{"Git::$_"};
		}
	}
	Memoize::memoize 'Git::config';
	Memoize::memoize 'Git::config_bool';
}

my ($SVN);

$sha1 = qr/[a-f\d]{40}/;
$sha1_short = qr/[a-f\d]{4,40}/;
my ($_stdin, $_help, $_edit,
	$_message, $_file, $_branch_dest,
	$_template, $_shared,
	$_version, $_fetch_all, $_no_rebase, $_fetch_parent,
	$_merge, $_strategy, $_dry_run, $_local,
	$_prefix, $_no_checkout, $_url, $_verbose,
	$_git_format, $_commit_url, $_tag, $_merge_info);
$Git::SVN::_follow_parent = 1;
$SVN::Git::Fetcher::_placeholder_filename = ".gitignore";
$_q ||= 0;
my %remote_opts = ( 'username=s' => \$Git::SVN::Prompt::_username,
                    'config-dir=s' => \$Git::SVN::Ra::config_dir,
                    'no-auth-cache' => \$Git::SVN::Prompt::_no_auth_cache,
                    'ignore-paths=s' => \$SVN::Git::Fetcher::_ignore_regex );
my %fc_opts = ( 'follow-parent|follow!' => \$Git::SVN::_follow_parent,
		'authors-file|A=s' => \$_authors,
		'authors-prog=s' => \$_authors_prog,
		'repack:i' => \$Git::SVN::_repack,
		'noMetadata' => \$Git::SVN::_no_metadata,
		'useSvmProps' => \$Git::SVN::_use_svm_props,
		'useSvnsyncProps' => \$Git::SVN::_use_svnsync_props,
		'log-window-size=i' => \$Git::SVN::Ra::_log_window_size,
		'no-checkout' => \$_no_checkout,
		'quiet|q+' => \$_q,
		'repack-flags|repack-args|repack-opts=s' =>
		   \$Git::SVN::_repack_flags,
		'use-log-author' => \$Git::SVN::_use_log_author,
		'add-author-from' => \$Git::SVN::_add_author_from,
		'localtime' => \$Git::SVN::_localtime,
		%remote_opts );

my ($_trunk, @_tags, @_branches, $_stdlayout);
my %icv;
my %init_opts = ( 'template=s' => \$_template, 'shared:s' => \$_shared,
                  'trunk|T=s' => \$_trunk, 'tags|t=s@' => \@_tags,
                  'branches|b=s@' => \@_branches, 'prefix=s' => \$_prefix,
                  'stdlayout|s' => \$_stdlayout,
                  'minimize-url|m!' => \$Git::SVN::_minimize_url,
		  'no-metadata' => sub { $icv{noMetadata} = 1 },
		  'use-svm-props' => sub { $icv{useSvmProps} = 1 },
		  'use-svnsync-props' => sub { $icv{useSvnsyncProps} = 1 },
		  'rewrite-root=s' => sub { $icv{rewriteRoot} = $_[1] },
		  'rewrite-uuid=s' => sub { $icv{rewriteUUID} = $_[1] },
                  %remote_opts );
my %cmt_opts = ( 'edit|e' => \$_edit,
		'rmdir' => \$SVN::Git::Editor::_rmdir,
		'find-copies-harder' => \$SVN::Git::Editor::_find_copies_harder,
		'l=i' => \$SVN::Git::Editor::_rename_limit,
		'copy-similarity|C=i'=> \$SVN::Git::Editor::_cp_similarity
);

my %cmd = (
	fetch => [ \&cmd_fetch, "Download new revisions from SVN",
			{ 'revision|r=s' => \$_revision,
			  'fetch-all|all' => \$_fetch_all,
			  'parent|p' => \$_fetch_parent,
			   %fc_opts } ],
	clone => [ \&cmd_clone, "Initialize and fetch revisions",
			{ 'revision|r=s' => \$_revision,
			  'preserve-empty-dirs' =>
				\$SVN::Git::Fetcher::_preserve_empty_dirs,
			  'placeholder-filename=s' =>
				\$SVN::Git::Fetcher::_placeholder_filename,
			   %fc_opts, %init_opts } ],
	init => [ \&cmd_init, "Initialize a repo for tracking" .
			  " (requires URL argument)",
			  \%init_opts ],
	'multi-init' => [ \&cmd_multi_init,
	                  "Deprecated alias for ".
			  "'$0 init -T<trunk> -b<branches> -t<tags>'",
			  \%init_opts ],
	dcommit => [ \&cmd_dcommit,
	             'Commit several diffs to merge with upstream',
			{ 'merge|m|M' => \$_merge,
			  'strategy|s=s' => \$_strategy,
			  'verbose|v' => \$_verbose,
			  'dry-run|n' => \$_dry_run,
			  'fetch-all|all' => \$_fetch_all,
			  'commit-url=s' => \$_commit_url,
			  'revision|r=i' => \$_revision,
			  'no-rebase' => \$_no_rebase,
			  'mergeinfo=s' => \$_merge_info,
			%cmt_opts, %fc_opts } ],
	branch => [ \&cmd_branch,
	            'Create a branch in the SVN repository',
	            { 'message|m=s' => \$_message,
	              'destination|d=s' => \$_branch_dest,
	              'dry-run|n' => \$_dry_run,
	              'tag|t' => \$_tag,
	              'username=s' => \$Git::SVN::Prompt::_username,
	              'commit-url=s' => \$_commit_url } ],
	tag => [ sub { $_tag = 1; cmd_branch(@_) },
	         'Create a tag in the SVN repository',
	         { 'message|m=s' => \$_message,
	           'destination|d=s' => \$_branch_dest,
	           'dry-run|n' => \$_dry_run,
	           'username=s' => \$Git::SVN::Prompt::_username,
	           'commit-url=s' => \$_commit_url } ],
	'set-tree' => [ \&cmd_set_tree,
	                "Set an SVN repository to a git tree-ish",
			{ 'stdin' => \$_stdin, %cmt_opts, %fc_opts, } ],
	'create-ignore' => [ \&cmd_create_ignore,
			     'Create a .gitignore per svn:ignore',
			     { 'revision|r=i' => \$_revision
			     } ],
	'mkdirs' => [ \&cmd_mkdirs ,
	              "recreate empty directories after a checkout",
	              { 'revision|r=i' => \$_revision } ],
        'propget' => [ \&cmd_propget,
		       'Print the value of a property on a file or directory',
		       { 'revision|r=i' => \$_revision } ],
        'proplist' => [ \&cmd_proplist,
		       'List all properties of a file or directory',
		       { 'revision|r=i' => \$_revision } ],
	'show-ignore' => [ \&cmd_show_ignore, "Show svn:ignore listings",
			{ 'revision|r=i' => \$_revision
			} ],
	'show-externals' => [ \&cmd_show_externals, "Show svn:externals listings",
			{ 'revision|r=i' => \$_revision
			} ],
	'multi-fetch' => [ \&cmd_multi_fetch,
	                   "Deprecated alias for $0 fetch --all",
			   { 'revision|r=s' => \$_revision, %fc_opts } ],
	'migrate' => [ sub { },
	               # no-op, we automatically run this anyways,
	               'Migrate configuration/metadata/layout from
		        previous versions of git-svn',
                       { 'minimize' => \$Git::SVN::Migration::_minimize,
			 %remote_opts } ],
	'log' => [ \&Git::SVN::Log::cmd_show_log, 'Show commit logs',
			{ 'limit=i' => \$Git::SVN::Log::limit,
			  'revision|r=s' => \$_revision,
			  'verbose|v' => \$Git::SVN::Log::verbose,
			  'incremental' => \$Git::SVN::Log::incremental,
			  'oneline' => \$Git::SVN::Log::oneline,
			  'show-commit' => \$Git::SVN::Log::show_commit,
			  'non-recursive' => \$Git::SVN::Log::non_recursive,
			  'authors-file|A=s' => \$_authors,
			  'color' => \$Git::SVN::Log::color,
			  'pager=s' => \$Git::SVN::Log::pager
			} ],
	'find-rev' => [ \&cmd_find_rev,
	                "Translate between SVN revision numbers and tree-ish",
			{} ],
	'rebase' => [ \&cmd_rebase, "Fetch and rebase your working directory",
			{ 'merge|m|M' => \$_merge,
			  'verbose|v' => \$_verbose,
			  'strategy|s=s' => \$_strategy,
			  'local|l' => \$_local,
			  'fetch-all|all' => \$_fetch_all,
			  'dry-run|n' => \$_dry_run,
			  %fc_opts } ],
	'commit-diff' => [ \&cmd_commit_diff,
	                   'Commit a diff between two trees',
			{ 'message|m=s' => \$_message,
			  'file|F=s' => \$_file,
			  'revision|r=s' => \$_revision,
			%cmt_opts } ],
	'info' => [ \&cmd_info,
		    "Show info about the latest SVN revision
		     on the current branch",
		    { 'url' => \$_url, } ],
	'blame' => [ \&Git::SVN::Log::cmd_blame,
	            "Show what revision and author last modified each line of a file",
		    { 'git-format' => \$_git_format } ],
	'reset' => [ \&cmd_reset,
		     "Undo fetches back to the specified SVN revision",
		     { 'revision|r=s' => \$_revision,
		       'parent|p' => \$_fetch_parent } ],
	'gc' => [ \&cmd_gc,
		  "Compress unhandled.log files in .git/svn and remove " .
		  "index files in .git/svn",
		{} ],
);

my $cmd;
for (my $i = 0; $i < @ARGV; $i++) {
	if (defined $cmd{$ARGV[$i]}) {
		$cmd = $ARGV[$i];
		splice @ARGV, $i, 1;
		last;
	} elsif ($ARGV[$i] eq 'help') {
		$cmd = $ARGV[$i+1];
		usage(0);
	}
};

# make sure we're always running at the top-level working directory
unless ($cmd && $cmd =~ /(?:clone|init|multi-init)$/) {
	unless (-d $ENV{GIT_DIR}) {
		if ($git_dir_user_set) {
			die "GIT_DIR=$ENV{GIT_DIR} explicitly set, ",
			    "but it is not a directory\n";
		}
		my $git_dir = delete $ENV{GIT_DIR};
		my $cdup = undef;
		git_cmd_try {
			$cdup = command_oneline(qw/rev-parse --show-cdup/);
			$git_dir = '.' unless ($cdup);
			chomp $cdup if ($cdup);
			$cdup = "." unless ($cdup && length $cdup);
		} "Already at toplevel, but $git_dir not found\n";
		chdir $cdup or die "Unable to chdir up to '$cdup'\n";
		unless (-d $git_dir) {
			die "$git_dir still not found after going to ",
			    "'$cdup'\n";
		}
		$ENV{GIT_DIR} = $git_dir;
	}
	$_repository = Git->repository(Repository => $ENV{GIT_DIR});
}

my %opts = %{$cmd{$cmd}->[2]} if (defined $cmd);

read_git_config(\%opts);
if ($cmd && ($cmd eq 'log' || $cmd eq 'blame')) {
	Getopt::Long::Configure('pass_through');
}
my $rv = GetOptions(%opts, 'help|H|h' => \$_help, 'version|V' => \$_version,
                    'minimize-connections' => \$Git::SVN::Migration::_minimize,
                    'id|i=s' => \$Git::SVN::default_ref_id,
                    'svn-remote|remote|R=s' => sub {
                       $Git::SVN::no_reuse_existing = 1;
                       $Git::SVN::default_repo_id = $_[1] });
exit 1 if (!$rv && $cmd && $cmd ne 'log');

usage(0) if $_help;
version() if $_version;
usage(1) unless defined $cmd;
load_authors() if $_authors;
if (defined $_authors_prog) {
	$_authors_prog = "'" . File::Spec->rel2abs($_authors_prog) . "'";
}

unless ($cmd =~ /^(?:clone|init|multi-init|commit-diff)$/) {
	Git::SVN::Migration::migration_check();
}
Git::SVN::init_vars();
eval {
	Git::SVN::verify_remotes_sanity();
	$cmd{$cmd}->[0]->(@ARGV);
};
fatal $@ if $@;
post_fetch_checkout();
exit 0;

####################### primary functions ######################
sub usage {
	my $exit = shift || 0;
	my $fd = $exit ? \*STDERR : \*STDOUT;
	print $fd <<"";
git-svn - bidirectional operations between a single Subversion tree and git
Usage: git svn <command> [options] [arguments]\n

	print $fd "Available commands:\n" unless $cmd;

	foreach (sort keys %cmd) {
		next if $cmd && $cmd ne $_;
		next if /^multi-/; # don't show deprecated commands
		print $fd '  ',pack('A17',$_),$cmd{$_}->[1],"\n";
		foreach (sort keys %{$cmd{$_}->[2]}) {
			# mixed-case options are for .git/config only
			next if /[A-Z]/ && /^[a-z]+$/i;
			# prints out arguments as they should be passed:
			my $x = s#[:=]s$## ? '<arg>' : s#[:=]i$## ? '<num>' : '';
			print $fd ' ' x 21, join(', ', map { length $_ > 1 ?
							"--$_" : "-$_" }
						split /\|/,$_)," $x\n";
		}
	}
	print $fd <<"";
\nGIT_SVN_ID may be set in the environment or via the --id/-i switch to an
arbitrary identifier if you're tracking multiple SVN branches/repositories in
one git repository and want to keep them separate.  See git-svn(1) for more
information.

	exit $exit;
}

sub version {
	::_req_svn();
	print "git-svn version $VERSION (svn $SVN::Core::VERSION)\n";
	exit 0;
}

sub do_git_init_db {
	unless (-d $ENV{GIT_DIR}) {
		my @init_db = ('init');
		push @init_db, "--template=$_template" if defined $_template;
		if (defined $_shared) {
			if ($_shared =~ /[a-z]/) {
				push @init_db, "--shared=$_shared";
			} else {
				push @init_db, "--shared";
			}
		}
		command_noisy(@init_db);
		$_repository = Git->repository(Repository => ".git");
	}
	my $set;
	my $pfx = "svn-remote.$Git::SVN::default_repo_id";
	foreach my $i (keys %icv) {
		die "'$set' and '$i' cannot both be set\n" if $set;
		next unless defined $icv{$i};
		command_noisy('config', "$pfx.$i", $icv{$i});
		$set = $i;
	}
	my $ignore_regex = \$SVN::Git::Fetcher::_ignore_regex;
	command_noisy('config', "$pfx.ignore-paths", $$ignore_regex)
		if defined $$ignore_regex;

	if (defined $SVN::Git::Fetcher::_preserve_empty_dirs) {
		my $fname = \$SVN::Git::Fetcher::_placeholder_filename;
		command_noisy('config', "$pfx.preserve-empty-dirs", 'true');
		command_noisy('config', "$pfx.placeholder-filename", $$fname);
	}
}

sub init_subdir {
	my $repo_path = shift or return;
	mkpath([$repo_path]) unless -d $repo_path;
	chdir $repo_path or die "Couldn't chdir to $repo_path: $!\n";
	$ENV{GIT_DIR} = '.git';
	$_repository = Git->repository(Repository => $ENV{GIT_DIR});
}

sub cmd_clone {
	my ($url, $path) = @_;
	if (!defined $path &&
	    (defined $_trunk || @_branches || @_tags ||
	     defined $_stdlayout) &&
	    $url !~ m#^[a-z\+]+://#) {
		$path = $url;
	}
	$path = basename($url) if !defined $path || !length $path;
	my $authors_absolute = $_authors ? File::Spec->rel2abs($_authors) : "";
	cmd_init($url, $path);
	command_oneline('config', 'svn.authorsfile', $authors_absolute)
	    if $_authors;
	Git::SVN::fetch_all($Git::SVN::default_repo_id);
}

sub cmd_init {
	if (defined $_stdlayout) {
		$_trunk = 'trunk' if (!defined $_trunk);
		@_tags = 'tags' if (! @_tags);
		@_branches = 'branches' if (! @_branches);
	}
	if (defined $_trunk || @_branches || @_tags) {
		return cmd_multi_init(@_);
	}
	my $url = shift or die "SVN repository location required ",
	                       "as a command-line argument\n";
	$url = canonicalize_url($url);
	init_subdir(@_);
	do_git_init_db();

	if ($Git::SVN::_minimize_url eq 'unset') {
		$Git::SVN::_minimize_url = 0;
	}

	Git::SVN->init($url);
}

sub cmd_fetch {
	if (grep /^\d+=./, @_) {
		die "'<rev>=<commit>' fetch arguments are ",
		    "no longer supported.\n";
	}
	my ($remote) = @_;
	if (@_ > 1) {
		die "Usage: $0 fetch [--all] [--parent] [svn-remote]\n";
	}
	$Git::SVN::no_reuse_existing = undef;
	if ($_fetch_parent) {
		my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
		unless ($gs) {
			die "Unable to determine upstream SVN information from ",
			    "working tree history\n";
		}
	        # just fetch, don't checkout.
		$_no_checkout = 'true';
		$_fetch_all ? $gs->fetch_all : $gs->fetch;
	} elsif ($_fetch_all) {
		cmd_multi_fetch();
	} else {
		$remote ||= $Git::SVN::default_repo_id;
		Git::SVN::fetch_all($remote, Git::SVN::read_all_remotes());
	}
}

sub cmd_set_tree {
	my (@commits) = @_;
	if ($_stdin || !@commits) {
		print "Reading from stdin...\n";
		@commits = ();
		while (<STDIN>) {
			if (/\b($sha1_short)\b/o) {
				unshift @commits, $1;
			}
		}
	}
	my @revs;
	foreach my $c (@commits) {
		my @tmp = command('rev-parse',$c);
		if (scalar @tmp == 1) {
			push @revs, $tmp[0];
		} elsif (scalar @tmp > 1) {
			push @revs, reverse(command('rev-list',@tmp));
		} else {
			fatal "Failed to rev-parse $c";
		}
	}
	my $gs = Git::SVN->new;
	my ($r_last, $cmt_last) = $gs->last_rev_commit;
	$gs->fetch;
	if (defined $gs->{last_rev} && $r_last != $gs->{last_rev}) {
		fatal "There are new revisions that were fetched ",
		      "and need to be merged (or acknowledged) ",
		      "before committing.\nlast rev: $r_last\n",
		      " current: $gs->{last_rev}";
	}
	$gs->set_tree($_) foreach @revs;
	print "Done committing ",scalar @revs," revisions to SVN\n";
	unlink $gs->{index};
}

sub split_merge_info_range {
	my ($range) = @_;
	if ($range =~ /(\d+)-(\d+)/) {
		return (int($1), int($2));
	} else {
		return (int($range), int($range));
	}
}

sub combine_ranges {
	my ($in) = @_;

	my @fnums = ();
	my @arr = split(/,/, $in);
	for my $element (@arr) {
		my ($start, $end) = split_merge_info_range($element);
		push @fnums, $start;
	}

	my @sorted = @arr [ sort {
		$fnums[$a] <=> $fnums[$b]
	} 0..$#arr ];

	my @return = ();
	my $last = -1;
	my $first = -1;
	for my $element (@sorted) {
		my ($start, $end) = split_merge_info_range($element);

		if ($last == -1) {
			$first = $start;
			$last = $end;
			next;
		}
		if ($start <= $last+1) {
			if ($end > $last) {
				$last = $end;
			}
			next;
		}
		if ($first == $last) {
			push @return, "$first";
		} else {
			push @return, "$first-$last";
		}
		$first = $start;
		$last = $end;
	}

	if ($first != -1) {
		if ($first == $last) {
			push @return, "$first";
		} else {
			push @return, "$first-$last";
		}
	}

	return join(',', @return);
}

sub merge_revs_into_hash {
	my ($hash, $minfo) = @_;
	my @lines = split(' ', $minfo);

	for my $line (@lines) {
		my ($branchpath, $revs) = split(/:/, $line);

		if (exists($hash->{$branchpath})) {
			# Merge the two revision sets
			my $combined = "$hash->{$branchpath},$revs";
			$hash->{$branchpath} = combine_ranges($combined);
		} else {
			# Just do range combining for consolidation
			$hash->{$branchpath} = combine_ranges($revs);
		}
	}
}

sub merge_merge_info {
	my ($mergeinfo_one, $mergeinfo_two) = @_;
	my %result_hash = ();

	merge_revs_into_hash(\%result_hash, $mergeinfo_one);
	merge_revs_into_hash(\%result_hash, $mergeinfo_two);

	my $result = '';
	# Sort below is for consistency's sake
	for my $branchname (sort keys(%result_hash)) {
		my $revlist = $result_hash{$branchname};
		$result .= "$branchname:$revlist\n"
	}
	return $result;
}

sub populate_merge_info {
	my ($d, $gs, $uuid, $linear_refs, $rewritten_parent) = @_;

	my %parentshash;
	read_commit_parents(\%parentshash, $d);
	my @parents = @{$parentshash{$d}};
	if ($#parents > 0) {
		# Merge commit
		my $all_parents_ok = 1;
		my $aggregate_mergeinfo = '';
		my $rooturl = $gs->repos_root;

		if (defined($rewritten_parent)) {
			# Replace first parent with newly-rewritten version
			shift @parents;
			unshift @parents, $rewritten_parent;
		}

		foreach my $parent (@parents) {
			my ($branchurl, $svnrev, $paruuid) =
				cmt_metadata($parent);

			unless (defined($svnrev)) {
				# Should have been caught be preflight check
				fatal "merge commit $d has ancestor $parent, but that change "
                     ."does not have git-svn metadata!";
			}
			unless ($branchurl =~ /^$rooturl(.*)/) {
				fatal "commit $parent git-svn metadata changed mid-run!";
			}
			my $branchpath = $1;

			my $ra = Git::SVN::Ra->new($branchurl);
			my (undef, undef, $props) =
				$ra->get_dir(canonicalize_path("."), $svnrev);
			my $par_mergeinfo = $props->{'svn:mergeinfo'};
			unless (defined $par_mergeinfo) {
				$par_mergeinfo = '';
			}
			# Merge previous mergeinfo values
			$aggregate_mergeinfo =
				merge_merge_info($aggregate_mergeinfo,
								 $par_mergeinfo, 0);

			next if $parent eq $parents[0]; # Skip first parent
			# Add new changes being placed in tree by merge
			my @cmd = (qw/rev-list --reverse/,
					   $parent, qw/--not/);
			foreach my $par (@parents) {
				unless ($par eq $parent) {
					push @cmd, $par;
				}
			}
			my @revsin = ();
			my ($revlist, $ctx) = command_output_pipe(@cmd);
			while (<$revlist>) {
				my $irev = $_;
				chomp $irev;
				my (undef, $csvnrev, undef) =
					cmt_metadata($irev);
				unless (defined $csvnrev) {
					# A child is missing SVN annotations...
					# this might be OK, or might not be.
					warn "W:child $irev is merged into revision "
						 ."$d but does not have git-svn metadata. "
						 ."This means git-svn cannot determine the "
						 ."svn revision numbers to place into the "
						 ."svn:mergeinfo property. You must ensure "
						 ."a branch is entirely committed to "
						 ."SVN before merging it in order for "
						 ."svn:mergeinfo population to function "
						 ."properly";
				}
				push @revsin, $csvnrev;
			}
			command_close_pipe($revlist, $ctx);

			last unless $all_parents_ok;

			# We now have a list of all SVN revnos which are
			# merged by this particular parent. Integrate them.
			next if $#revsin == -1;
			my $newmergeinfo = "$branchpath:" . join(',', @revsin);
			$aggregate_mergeinfo =
				merge_merge_info($aggregate_mergeinfo,
								 $newmergeinfo, 1);
		}
		if ($all_parents_ok and $aggregate_mergeinfo) {
			return $aggregate_mergeinfo;
		}
	}

	return undef;
}

sub cmd_dcommit {
	my $head = shift;
	command_noisy(qw/update-index --refresh/);
	git_cmd_try { command_oneline(qw/diff-index --quiet HEAD/) }
		'Cannot dcommit with a dirty index.  Commit your changes first, '
		. "or stash them with `git stash'.\n";
	$head ||= 'HEAD';

	my $old_head;
	if ($head ne 'HEAD') {
		$old_head = eval {
			command_oneline([qw/symbolic-ref -q HEAD/])
		};
		if ($old_head) {
			$old_head =~ s{^refs/heads/}{};
		} else {
			$old_head = eval { command_oneline(qw/rev-parse HEAD/) };
		}
		command(['checkout', $head], STDERR => 0);
	}

	my @refs;
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD', \@refs);
	unless ($gs) {
		die "Unable to determine upstream SVN information from ",
		    "$head history.\nPerhaps the repository is empty.";
	}

	if (defined $_commit_url) {
		$url = $_commit_url;
	} else {
		$url = eval { command_oneline('config', '--get',
			      "svn-remote.$gs->{repo_id}.commiturl") };
		if (!$url) {
			$url = $gs->full_pushurl
		}
	}

	my $last_rev = $_revision if defined $_revision;
	if ($url) {
		print "Committing to $url ...\n";
	}
	my ($linear_refs, $parents) = linearize_history($gs, \@refs);
	if ($_no_rebase && scalar(@$linear_refs) > 1) {
		warn "Attempting to commit more than one change while ",
		     "--no-rebase is enabled.\n",
		     "If these changes depend on each other, re-running ",
		     "without --no-rebase may be required."
	}
	my $expect_url = $url;

	my $push_merge_info = eval {
		command_oneline(qw/config --get svn.pushmergeinfo/)
		};
	if (not defined($push_merge_info)
			or $push_merge_info eq "false"
			or $push_merge_info eq "no"
			or $push_merge_info eq "never") {
		$push_merge_info = 0;
	}

	unless (defined($_merge_info) || ! $push_merge_info) {
		# Preflight check of changes to ensure no issues with mergeinfo
		# This includes check for uncommitted-to-SVN parents
		# (other than the first parent, which we will handle),
		# information from different SVN repos, and paths
		# which are not underneath this repository root.
		my $rooturl = $gs->repos_root;
		foreach my $d (@$linear_refs) {
			my %parentshash;
			read_commit_parents(\%parentshash, $d);
			my @realparents = @{$parentshash{$d}};
			if ($#realparents > 0) {
				# Merge commit
				shift @realparents; # Remove/ignore first parent
				foreach my $parent (@realparents) {
					my ($branchurl, $svnrev, $paruuid) = cmt_metadata($parent);
					unless (defined $paruuid) {
						# A parent is missing SVN annotations...
						# abort the whole operation.
						fatal "$parent is merged into revision $d, "
							 ."but does not have git-svn metadata. "
							 ."Either dcommit the branch or use a "
							 ."local cherry-pick, FF merge, or rebase "
							 ."instead of an explicit merge commit.";
					}

					unless ($paruuid eq $uuid) {
						# Parent has SVN metadata from different repository
						fatal "merge parent $parent for change $d has "
							 ."git-svn uuid $paruuid, while current change "
							 ."has uuid $uuid!";
					}

					unless ($branchurl =~ /^$rooturl(.*)/) {
						# This branch is very strange indeed.
						fatal "merge parent $parent for $d is on branch "
							 ."$branchurl, which is not under the "
							 ."git-svn root $rooturl!";
					}
				}
			}
		}
	}

	my $rewritten_parent;
	Git::SVN::remove_username($expect_url);
	if (defined($_merge_info)) {
		$_merge_info =~ tr{ }{\n};
	}
	while (1) {
		my $d = shift @$linear_refs or last;
		unless (defined $last_rev) {
			(undef, $last_rev, undef) = cmt_metadata("$d~1");
			unless (defined $last_rev) {
				fatal "Unable to extract revision information ",
				      "from commit $d~1";
			}
		}
		if ($_dry_run) {
			print "diff-tree $d~1 $d\n";
		} else {
			my $cmt_rev;

			unless (defined($_merge_info) || ! $push_merge_info) {
				$_merge_info = populate_merge_info($d, $gs,
				                             $uuid,
				                             $linear_refs,
				                             $rewritten_parent);
			}

			my %ed_opts = ( r => $last_rev,
			                log => get_commit_entry($d)->{log},
			                ra => Git::SVN::Ra->new($url),
			                config => SVN::Core::config_get_config(
			                        $Git::SVN::Ra::config_dir
			                ),
			                tree_a => "$d~1",
			                tree_b => $d,
			                editor_cb => sub {
			                       print "Committed r$_[0]\n";
			                       $cmt_rev = $_[0];
			                },
					mergeinfo => $_merge_info,
			                svn_path => '');
			if (!SVN::Git::Editor->new(\%ed_opts)->apply_diff) {
				print "No changes\n$d~1 == $d\n";
			} elsif ($parents->{$d} && @{$parents->{$d}}) {
				$gs->{inject_parents_dcommit}->{$cmt_rev} =
				                               $parents->{$d};
			}
			$_fetch_all ? $gs->fetch_all : $gs->fetch;
			$last_rev = $cmt_rev;
			next if $_no_rebase;

			# we always want to rebase against the current HEAD,
			# not any head that was passed to us
			my @diff = command('diff-tree', $d,
			                   $gs->refname, '--');
			my @finish;
			if (@diff) {
				@finish = rebase_cmd();
				print STDERR "W: $d and ", $gs->refname,
				             " differ, using @finish:\n",
				             join("\n", @diff), "\n";
			} else {
				print "No changes between current HEAD and ",
				      $gs->refname,
				      "\nResetting to the latest ",
				      $gs->refname, "\n";
				@finish = qw/reset --mixed/;
			}
			command_noisy(@finish, $gs->refname);

			$rewritten_parent = command_oneline(qw/rev-parse HEAD/);

			if (@diff) {
				@refs = ();
				my ($url_, $rev_, $uuid_, $gs_) =
				              working_head_info('HEAD', \@refs);
				my ($linear_refs_, $parents_) =
				              linearize_history($gs_, \@refs);
				if (scalar(@$linear_refs) !=
				    scalar(@$linear_refs_)) {
					fatal "# of revisions changed ",
					  "\nbefore:\n",
					  join("\n", @$linear_refs),
					  "\n\nafter:\n",
					  join("\n", @$linear_refs_), "\n",
					  'If you are attempting to commit ',
					  "merges, try running:\n\t",
					  'git rebase --interactive',
					  '--preserve-merges ',
					  $gs->refname,
					  "\nBefore dcommitting";
				}
				if ($url_ ne $expect_url) {
					if ($url_ eq $gs->metadata_url) {
						print
						  "Accepting rewritten URL:",
						  " $url_\n";
					} else {
						fatal
						  "URL mismatch after rebase:",
						  " $url_ != $expect_url";
					}
				}
				if ($uuid_ ne $uuid) {
					fatal "uuid mismatch after rebase: ",
					      "$uuid_ != $uuid";
				}
				# remap parents
				my (%p, @l, $i);
				for ($i = 0; $i < scalar @$linear_refs; $i++) {
					my $new = $linear_refs_->[$i] or next;
					$p{$new} =
						$parents->{$linear_refs->[$i]};
					push @l, $new;
				}
				$parents = \%p;
				$linear_refs = \@l;
			}
		}
	}

	if ($old_head) {
		my $new_head = command_oneline(qw/rev-parse HEAD/);
		my $new_is_symbolic = eval {
			command_oneline(qw/symbolic-ref -q HEAD/);
		};
		if ($new_is_symbolic) {
			print "dcommitted the branch ", $head, "\n";
		} else {
			print "dcommitted on a detached HEAD because you gave ",
			      "a revision argument.\n",
			      "The rewritten commit is: ", $new_head, "\n";
		}
		command(['checkout', $old_head], STDERR => 0);
	}

	unlink $gs->{index};
}

sub cmd_branch {
	my ($branch_name, $head) = @_;

	unless (defined $branch_name && length $branch_name) {
		die(($_tag ? "tag" : "branch") . " name required\n");
	}
	$head ||= 'HEAD';

	my (undef, $rev, undef, $gs) = working_head_info($head);
	my $src = $gs->full_pushurl;

	my $remote = Git::SVN::read_all_remotes()->{$gs->{repo_id}};
	my $allglobs = $remote->{ $_tag ? 'tags' : 'branches' };
	my $glob;
	if ($#{$allglobs} == 0) {
		$glob = $allglobs->[0];
	} else {
		unless(defined $_branch_dest) {
			die "Multiple ",
			    $_tag ? "tag" : "branch",
			    " paths defined for Subversion repository.\n",
		            "You must specify where you want to create the ",
		            $_tag ? "tag" : "branch",
		            " with the --destination argument.\n";
		}
		foreach my $g (@{$allglobs}) {
			# SVN::Git::Editor could probably be moved to Git.pm..
			my $re = SVN::Git::Editor::glob2pat($g->{path}->{left});
			if ($_branch_dest =~ /$re/) {
				$glob = $g;
				last;
			}
		}
		unless (defined $glob) {
			my $dest_re = qr/\b\Q$_branch_dest\E\b/;
			foreach my $g (@{$allglobs}) {
				$g->{path}->{left} =~ /$dest_re/ or next;
				if (defined $glob) {
					die "Ambiguous destination: ",
					    $_branch_dest, "\nmatches both '",
					    $glob->{path}->{left}, "' and '",
					    $g->{path}->{left}, "'\n";
				}
				$glob = $g;
			}
			unless (defined $glob) {
				die "Unknown ",
				    $_tag ? "tag" : "branch",
				    " destination $_branch_dest\n";
			}
		}
	}
	my ($lft, $rgt) = @{ $glob->{path} }{qw/left right/};
	my $url;
	if (defined $_commit_url) {
		$url = $_commit_url;
	} else {
		$url = eval { command_oneline('config', '--get',
			"svn-remote.$gs->{repo_id}.commiturl") };
		if (!$url) {
			$url = $remote->{pushurl} || $remote->{url};
		}
	}
	my $dst = join '/', $url, $lft, $branch_name, ($rgt || ());

	if ($dst =~ /^https:/ && $src =~ /^http:/) {
		$src=~s/^http:/https:/;
	}

	::_req_svn();

	my $ctx = SVN::Client->new(
		auth    => Git::SVN::Ra::_auth_providers(),
		log_msg => sub {
			${ $_[0] } = defined $_message
				? $_message
				: 'Create ' . ($_tag ? 'tag ' : 'branch ' )
				. $branch_name;
		},
	);

	eval {
		$ctx->ls($dst, 'HEAD', 0);
	} and die "branch ${branch_name} already exists\n";

	print "Copying ${src} at r${rev} to ${dst}...\n";
	$ctx->copy($src, $rev, $dst)
		unless $_dry_run;

	$gs->fetch_all;
}

sub cmd_find_rev {
	my $revision_or_hash = shift or die "SVN or git revision required ",
	                                    "as a command-line argument\n";
	my $result;
	if ($revision_or_hash =~ /^r\d+$/) {
		my $head = shift;
		$head ||= 'HEAD';
		my @refs;
		my (undef, undef, $uuid, $gs) = working_head_info($head, \@refs);
		unless ($gs) {
			die "Unable to determine upstream SVN information from ",
			    "$head history\n";
		}
		my $desired_revision = substr($revision_or_hash, 1);
		$result = $gs->rev_map_get($desired_revision, $uuid);
	} else {
		my (undef, $rev, undef) = cmt_metadata($revision_or_hash);
		$result = $rev;
	}
	print "$result\n" if $result;
}

sub auto_create_empty_directories {
	my ($gs) = @_;
	my $var = eval { command_oneline('config', '--get', '--bool',
					 "svn-remote.$gs->{repo_id}.automkdirs") };
	# By default, create empty directories by consulting the unhandled log,
	# but allow setting it to 'false' to skip it.
	return !($var && $var eq 'false');
}

sub cmd_rebase {
	command_noisy(qw/update-index --refresh/);
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	unless ($gs) {
		die "Unable to determine upstream SVN information from ",
		    "working tree history\n";
	}
	if ($_dry_run) {
		print "Remote Branch: " . $gs->refname . "\n";
		print "SVN URL: " . $url . "\n";
		return;
	}
	if (command(qw/diff-index HEAD --/)) {
		print STDERR "Cannot rebase with uncommited changes:\n";
		command_noisy('status');
		exit 1;
	}
	unless ($_local) {
		# rebase will checkout for us, so no need to do it explicitly
		$_no_checkout = 'true';
		$_fetch_all ? $gs->fetch_all : $gs->fetch;
	}
	command_noisy(rebase_cmd(), $gs->refname);
	if (auto_create_empty_directories($gs)) {
		$gs->mkemptydirs;
	}
}

sub cmd_show_ignore {
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	$gs ||= Git::SVN->new;
	my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
	$gs->prop_walk($gs->{path}, $r, sub {
		my ($gs, $path, $props) = @_;
		print STDOUT "\n# $path\n";
		my $s = $props->{'svn:ignore'} or return;
		$s =~ s/[\r\n]+/\n/g;
		$s =~ s/^\n+//;
		chomp $s;
		$s =~ s#^#$path#gm;
		print STDOUT "$s\n";
	});
}

sub cmd_show_externals {
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	$gs ||= Git::SVN->new;
	my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
	$gs->prop_walk($gs->{path}, $r, sub {
		my ($gs, $path, $props) = @_;
		print STDOUT "\n# $path\n";
		my $s = $props->{'svn:externals'} or return;
		$s =~ s/[\r\n]+/\n/g;
		chomp $s;
		$s =~ s#^#$path#gm;
		print STDOUT "$s\n";
	});
}

sub cmd_create_ignore {
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	$gs ||= Git::SVN->new;
	my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
	$gs->prop_walk($gs->{path}, $r, sub {
		my ($gs, $path, $props) = @_;
		# $path is of the form /path/to/dir/
		$path = '.' . $path;
		# SVN can have attributes on empty directories,
		# which git won't track
		mkpath([$path]) unless -d $path;
		my $ignore = $path . '.gitignore';
		my $s = $props->{'svn:ignore'} or return;
		open(GITIGNORE, '>', $ignore)
		  or fatal("Failed to open `$ignore' for writing: $!");
		$s =~ s/[\r\n]+/\n/g;
		$s =~ s/^\n+//;
		chomp $s;
		# Prefix all patterns so that the ignore doesn't apply
		# to sub-directories.
		$s =~ s#^#/#gm;
		print GITIGNORE "$s\n";
		close(GITIGNORE)
		  or fatal("Failed to close `$ignore': $!");
		command_noisy('add', '-f', $ignore);
	});
}

sub cmd_mkdirs {
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	$gs ||= Git::SVN->new;
	$gs->mkemptydirs($_revision);
}

sub canonicalize_path {
	my ($path) = @_;
	my $dot_slash_added = 0;
	if (substr($path, 0, 1) ne "/") {
		$path = "./" . $path;
		$dot_slash_added = 1;
	}
	# File::Spec->canonpath doesn't collapse x/../y into y (for a
	# good reason), so let's do this manually.
	$path =~ s#/+#/#g;
	$path =~ s#/\.(?:/|$)#/#g;
	$path =~ s#/[^/]+/\.\.##g;
	$path =~ s#/$##g;
	$path =~ s#^\./## if $dot_slash_added;
	$path =~ s#^/##;
	$path =~ s#^\.$##;
	return $path;
}

sub canonicalize_url {
	my ($url) = @_;
	$url =~ s#^([^:]+://[^/]*/)(.*)$#$1 . canonicalize_path($2)#e;
	return $url;
}

# get_svnprops(PATH)
# ------------------
# Helper for cmd_propget and cmd_proplist below.
sub get_svnprops {
	my $path = shift;
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	$gs ||= Git::SVN->new;

	# prefix THE PATH by the sub-directory from which the user
	# invoked us.
	$path = $cmd_dir_prefix . $path;
	fatal("No such file or directory: $path") unless -e $path;
	my $is_dir = -d $path ? 1 : 0;
	$path = $gs->{path} . '/' . $path;

	# canonicalize the path (otherwise libsvn will abort or fail to
	# find the file)
	$path = canonicalize_path($path);

	my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
	my $props;
	if ($is_dir) {
		(undef, undef, $props) = $gs->ra->get_dir($path, $r);
	}
	else {
		(undef, $props) = $gs->ra->get_file($path, $r, undef);
	}
	return $props;
}

# cmd_propget (PROP, PATH)
# ------------------------
# Print the SVN property PROP for PATH.
sub cmd_propget {
	my ($prop, $path) = @_;
	$path = '.' if not defined $path;
	usage(1) if not defined $prop;
	my $props = get_svnprops($path);
	if (not defined $props->{$prop}) {
		fatal("`$path' does not have a `$prop' SVN property.");
	}
	print $props->{$prop} . "\n";
}

# cmd_proplist (PATH)
# -------------------
# Print the list of SVN properties for PATH.
sub cmd_proplist {
	my $path = shift;
	$path = '.' if not defined $path;
	my $props = get_svnprops($path);
	print "Properties on '$path':\n";
	foreach (sort keys %{$props}) {
		print "  $_\n";
	}
}

sub cmd_multi_init {
	my $url = shift;
	unless (defined $_trunk || @_branches || @_tags) {
		usage(1);
	}

	$_prefix = '' unless defined $_prefix;
	if (defined $url) {
		$url = canonicalize_url($url);
		init_subdir(@_);
	}
	do_git_init_db();
	if (defined $_trunk) {
		$_trunk =~ s#^/+##;
		my $trunk_ref = 'refs/remotes/' . $_prefix . 'trunk';
		# try both old-style and new-style lookups:
		my $gs_trunk = eval { Git::SVN->new($trunk_ref) };
		unless ($gs_trunk) {
			my ($trunk_url, $trunk_path) =
			                      complete_svn_url($url, $_trunk);
			$gs_trunk = Git::SVN->init($trunk_url, $trunk_path,
						   undef, $trunk_ref);
		}
	}
	return unless @_branches || @_tags;
	my $ra = $url ? Git::SVN::Ra->new($url) : undef;
	foreach my $path (@_branches) {
		complete_url_ls_init($ra, $path, '--branches/-b', $_prefix);
	}
	foreach my $path (@_tags) {
		complete_url_ls_init($ra, $path, '--tags/-t', $_prefix.'tags/');
	}
}

sub cmd_multi_fetch {
	$Git::SVN::no_reuse_existing = undef;
	my $remotes = Git::SVN::read_all_remotes();
	foreach my $repo_id (sort keys %$remotes) {
		if ($remotes->{$repo_id}->{url}) {
			Git::SVN::fetch_all($repo_id, $remotes);
		}
	}
}

# this command is special because it requires no metadata
sub cmd_commit_diff {
	my ($ta, $tb, $url) = @_;
	my $usage = "Usage: $0 commit-diff -r<revision> ".
	            "<tree-ish> <tree-ish> [<URL>]";
	fatal($usage) if (!defined $ta || !defined $tb);
	my $svn_path = '';
	if (!defined $url) {
		my $gs = eval { Git::SVN->new };
		if (!$gs) {
			fatal("Needed URL or usable git-svn --id in ",
			      "the command-line\n", $usage);
		}
		$url = $gs->{url};
		$svn_path = $gs->{path};
	}
	unless (defined $_revision) {
		fatal("-r|--revision is a required argument\n", $usage);
	}
	if (defined $_message && defined $_file) {
		fatal("Both --message/-m and --file/-F specified ",
		      "for the commit message.\n",
		      "I have no idea what you mean");
	}
	if (defined $_file) {
		$_message = file_to_s($_file);
	} else {
		$_message ||= get_commit_entry($tb)->{log};
	}
	my $ra ||= Git::SVN::Ra->new($url);
	my $r = $_revision;
	if ($r eq 'HEAD') {
		$r = $ra->get_latest_revnum;
	} elsif ($r !~ /^\d+$/) {
		die "revision argument: $r not understood by git-svn\n";
	}
	my %ed_opts = ( r => $r,
	                log => $_message,
	                ra => $ra,
	                tree_a => $ta,
	                tree_b => $tb,
	                editor_cb => sub { print "Committed r$_[0]\n" },
	                svn_path => $svn_path );
	if (!SVN::Git::Editor->new(\%ed_opts)->apply_diff) {
		print "No changes\n$ta == $tb\n";
	}
}

sub escape_uri_only {
	my ($uri) = @_;
	my @tmp;
	foreach (split m{/}, $uri) {
		s/([^~\w.%+-]|%(?![a-fA-F0-9]{2}))/sprintf("%%%02X",ord($1))/eg;
		push @tmp, $_;
	}
	join('/', @tmp);
}

sub escape_url {
	my ($url) = @_;
	if ($url =~ m#^([^:]+)://([^/]*)(.*)$#) {
		my ($scheme, $domain, $uri) = ($1, $2, escape_uri_only($3));
		$url = "$scheme://$domain$uri";
	}
	$url;
}

sub cmd_info {
	my $path = canonicalize_path(defined($_[0]) ? $_[0] : ".");
	my $fullpath = canonicalize_path($cmd_dir_prefix . $path);
	if (exists $_[1]) {
		die "Too many arguments specified\n";
	}

	my ($file_type, $diff_status) = find_file_type_and_diff_status($path);

	if (!$file_type && !$diff_status) {
		print STDERR "svn: '$path' is not under version control\n";
		exit 1;
	}

	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	unless ($gs) {
		die "Unable to determine upstream SVN information from ",
		    "working tree history\n";
	}

	# canonicalize_path() will return "" to make libsvn 1.5.x happy,
	$path = "." if $path eq "";

	my $full_url = $url . ($fullpath eq "" ? "" : "/$fullpath");

	if ($_url) {
		print escape_url($full_url), "\n";
		return;
	}

	my $result = "Path: $path\n";
	$result .= "Name: " . basename($path) . "\n" if $file_type ne "dir";
	$result .= "URL: " . escape_url($full_url) . "\n";

	eval {
		my $repos_root = $gs->repos_root;
		Git::SVN::remove_username($repos_root);
		$result .= "Repository Root: " . escape_url($repos_root) . "\n";
	};
	if ($@) {
		$result .= "Repository Root: (offline)\n";
	}
	::_req_svn();
	$result .= "Repository UUID: $uuid\n" unless $diff_status eq "A" &&
		($SVN::Core::VERSION le '1.5.4' || $file_type ne "dir");
	$result .= "Revision: " . ($diff_status eq "A" ? 0 : $rev) . "\n";

	$result .= "Node Kind: " .
		   ($file_type eq "dir" ? "directory" : "file") . "\n";

	my $schedule = $diff_status eq "A"
		       ? "add"
		       : ($diff_status eq "D" ? "delete" : "normal");
	$result .= "Schedule: $schedule\n";

	if ($diff_status eq "A") {
		print $result, "\n";
		return;
	}

	my ($lc_author, $lc_rev, $lc_date_utc);
	my @args = Git::SVN::Log::git_svn_log_cmd($rev, $rev, "--", $fullpath);
	my $log = command_output_pipe(@args);
	my $esc_color = qr/(?:\033\[(?:(?:\d+;)*\d*)?m)*/;
	while (<$log>) {
		if (/^${esc_color}author (.+) <[^>]+> (\d+) ([\-\+]?\d+)$/o) {
			$lc_author = $1;
			$lc_date_utc = Git::SVN::Log::parse_git_date($2, $3);
		} elsif (/^${esc_color}    (git-svn-id:.+)$/o) {
			(undef, $lc_rev, undef) = ::extract_metadata($1);
		}
	}
	close $log;

	Git::SVN::Log::set_local_timezone();

	$result .= "Last Changed Author: $lc_author\n";
	$result .= "Last Changed Rev: $lc_rev\n";
	$result .= "Last Changed Date: " .
		   Git::SVN::Log::format_svn_date($lc_date_utc) . "\n";

	if ($file_type ne "dir") {
		my $text_last_updated_date =
		    ($diff_status eq "D" ? $lc_date_utc : (stat $path)[9]);
		$result .=
		    "Text Last Updated: " .
		    Git::SVN::Log::format_svn_date($text_last_updated_date) .
		    "\n";
		my $checksum;
		if ($diff_status eq "D") {
			my ($fh, $ctx) =
			    command_output_pipe(qw(cat-file blob), "HEAD:$path");
			if ($file_type eq "link") {
				my $file_name = <$fh>;
				$checksum = md5sum("link $file_name");
			} else {
				$checksum = md5sum($fh);
			}
			command_close_pipe($fh, $ctx);
		} elsif ($file_type eq "link") {
			my $file_name =
			    command(qw(cat-file blob), "HEAD:$path");
			$checksum =
			    md5sum("link " . $file_name);
		} else {
			open FILE, "<", $path or die $!;
			$checksum = md5sum(\*FILE);
			close FILE or die $!;
		}
		$result .= "Checksum: " . $checksum . "\n";
	}

	print $result, "\n";
}

sub cmd_reset {
	my $target = shift || $_revision or die "SVN revision required\n";
	$target = $1 if $target =~ /^r(\d+)$/;
	$target =~ /^\d+$/ or die "Numeric SVN revision expected\n";
	my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
	unless ($gs) {
		die "Unable to determine upstream SVN information from ".
		    "history\n";
	}
	my ($r, $c) = $gs->find_rev_before($target, not $_fetch_parent);
	die "Cannot find SVN revision $target\n" unless defined($c);
	$gs->rev_map_set($r, $c, 'reset', $uuid);
	print "r$r = $c ($gs->{ref_id})\n";
}

sub cmd_gc {
	if (!$can_compress) {
		warn "Compress::Zlib could not be found; unhandled.log " .
		     "files will not be compressed.\n";
	}
	find({ wanted => \&gc_directory, no_chdir => 1}, "$ENV{GIT_DIR}/svn");
}

########################### utility functions #########################

sub rebase_cmd {
	my @cmd = qw/rebase/;
	push @cmd, '-v' if $_verbose;
	push @cmd, qw/--merge/ if $_merge;
	push @cmd, "--strategy=$_strategy" if $_strategy;
	@cmd;
}

sub post_fetch_checkout {
	return if $_no_checkout;
	my $gs = $Git::SVN::_head or return;
	return if verify_ref('refs/heads/master^0');

	# look for "trunk" ref if it exists
	my $remote = Git::SVN::read_all_remotes()->{$gs->{repo_id}};
	my $fetch = $remote->{fetch};
	if ($fetch) {
		foreach my $p (keys %$fetch) {
			basename($fetch->{$p}) eq 'trunk' or next;
			$gs = Git::SVN->new($fetch->{$p}, $gs->{repo_id}, $p);
			last;
		}
	}

	my $valid_head = verify_ref('HEAD^0');
	command_noisy(qw(update-ref refs/heads/master), $gs->refname);
	return if ($valid_head || !verify_ref('HEAD^0'));

	return if $ENV{GIT_DIR} !~ m#^(?:.*/)?\.git$#;
	my $index = $ENV{GIT_INDEX_FILE} || "$ENV{GIT_DIR}/index";
	return if -f $index;

	return if command_oneline(qw/rev-parse --is-inside-work-tree/) eq 'false';
	return if command_oneline(qw/rev-parse --is-inside-git-dir/) eq 'true';
	command_noisy(qw/read-tree -m -u -v HEAD HEAD/);
	print STDERR "Checked out HEAD:\n  ",
	             $gs->full_url, " r", $gs->last_rev, "\n";
	if (auto_create_empty_directories($gs)) {
		$gs->mkemptydirs($gs->last_rev);
	}
}

sub complete_svn_url {
	my ($url, $path) = @_;
	$path =~ s#/+$##;
	if ($path !~ m#^[a-z\+]+://#) {
		if (!defined $url || $url !~ m#^[a-z\+]+://#) {
			fatal("E: '$path' is not a complete URL ",
			      "and a separate URL is not specified");
		}
		return ($url, $path);
	}
	return ($path, '');
}

sub complete_url_ls_init {
	my ($ra, $repo_path, $switch, $pfx) = @_;
	unless ($repo_path) {
		print STDERR "W: $switch not specified\n";
		return;
	}
	$repo_path =~ s#/+$##;
	if ($repo_path =~ m#^[a-z\+]+://#) {
		$ra = Git::SVN::Ra->new($repo_path);
		$repo_path = '';
	} else {
		$repo_path =~ s#^/+##;
		unless ($ra) {
			fatal("E: '$repo_path' is not a complete URL ",
			      "and a separate URL is not specified");
		}
	}
	my $url = $ra->{url};
	my $gs = Git::SVN->init($url, undef, undef, undef, 1);
	my $k = "svn-remote.$gs->{repo_id}.url";
	my $orig_url = eval { command_oneline(qw/config --get/, $k) };
	if ($orig_url && ($orig_url ne $gs->{url})) {
		die "$k already set: $orig_url\n",
		    "wanted to set to: $gs->{url}\n";
	}
	command_oneline('config', $k, $gs->{url}) unless $orig_url;
	my $remote_path = "$gs->{path}/$repo_path";
	$remote_path =~ s{%([0-9A-F]{2})}{chr hex($1)}ieg;
	$remote_path =~ s#/+#/#g;
	$remote_path =~ s#^/##g;
	$remote_path .= "/*" if $remote_path !~ /\*/;
	my ($n) = ($switch =~ /^--(\w+)/);
	if (length $pfx && $pfx !~ m#/$#) {
		die "--prefix='$pfx' must have a trailing slash '/'\n";
	}
	command_noisy('config',
		      '--add',
	              "svn-remote.$gs->{repo_id}.$n",
	              "$remote_path:refs/remotes/$pfx*" .
	                ('/*' x (($remote_path =~ tr/*/*/) - 1)) );
}

sub verify_ref {
	my ($ref) = @_;
	eval { command_oneline([ 'rev-parse', '--verify', $ref ],
	                       { STDERR => 0 }); };
}

sub get_tree_from_treeish {
	my ($treeish) = @_;
	# $treeish can be a symbolic ref, too:
	my $type = command_oneline(qw/cat-file -t/, $treeish);
	my $expected;
	while ($type eq 'tag') {
		($treeish, $type) = command(qw/cat-file tag/, $treeish);
	}
	if ($type eq 'commit') {
		$expected = (grep /^tree /, command(qw/cat-file commit/,
		                                    $treeish))[0];
		($expected) = ($expected =~ /^tree ($sha1)$/o);
		die "Unable to get tree from $treeish\n" unless $expected;
	} elsif ($type eq 'tree') {
		$expected = $treeish;
	} else {
		die "$treeish is a $type, expected tree, tag or commit\n";
	}
	return $expected;
}

sub get_commit_entry {
	my ($treeish) = shift;
	my %log_entry = ( log => '', tree => get_tree_from_treeish($treeish) );
	my $commit_editmsg = "$ENV{GIT_DIR}/COMMIT_EDITMSG";
	my $commit_msg = "$ENV{GIT_DIR}/COMMIT_MSG";
	open my $log_fh, '>', $commit_editmsg or croak $!;

	my $type = command_oneline(qw/cat-file -t/, $treeish);
	if ($type eq 'commit' || $type eq 'tag') {
		my ($msg_fh, $ctx) = command_output_pipe('cat-file',
		                                         $type, $treeish);
		my $in_msg = 0;
		my $author;
		my $saw_from = 0;
		my $msgbuf = "";
		while (<$msg_fh>) {
			if (!$in_msg) {
				$in_msg = 1 if (/^\s*$/);
				$author = $1 if (/^author (.*>)/);
			} elsif (/^git-svn-id: /) {
				# skip this for now, we regenerate the
				# correct one on re-fetch anyways
				# TODO: set *:merge properties or like...
			} else {
				if (/^From:/ || /^Signed-off-by:/) {
					$saw_from = 1;
				}
				$msgbuf .= $_;
			}
		}
		$msgbuf =~ s/\s+$//s;
		if ($Git::SVN::_add_author_from && defined($author)
		    && !$saw_from) {
			$msgbuf .= "\n\nFrom: $author";
		}
		print $log_fh $msgbuf or croak $!;
		command_close_pipe($msg_fh, $ctx);
	}
	close $log_fh or croak $!;

	if ($_edit || ($type eq 'tree')) {
		chomp(my $editor = command_oneline(qw(var GIT_EDITOR)));
		system('sh', '-c', $editor.' "$@"', $editor, $commit_editmsg);
	}
	rename $commit_editmsg, $commit_msg or croak $!;
	{
		require Encode;
		# SVN requires messages to be UTF-8 when entering the repo
		local $/;
		open $log_fh, '<', $commit_msg or croak $!;
		binmode $log_fh;
		chomp($log_entry{log} = <$log_fh>);

		my $enc = Git::config('i18n.commitencoding') || 'UTF-8';
		my $msg = $log_entry{log};

		eval { $msg = Encode::decode($enc, $msg, 1) };
		if ($@) {
			die "Could not decode as $enc:\n", $msg,
			    "\nPerhaps you need to set i18n.commitencoding\n";
		}

		eval { $msg = Encode::encode('UTF-8', $msg, 1) };
		die "Could not encode as UTF-8:\n$msg\n" if $@;

		$log_entry{log} = $msg;

		close $log_fh or croak $!;
	}
	unlink $commit_msg;
	\%log_entry;
}

sub s_to_file {
	my ($str, $file, $mode) = @_;
	open my $fd,'>',$file or croak $!;
	print $fd $str,"\n" or croak $!;
	close $fd or croak $!;
	chmod ($mode &~ umask, $file) if (defined $mode);
}

sub file_to…