merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 2240 insertions, 0 deletions

diff --git a/third_party/git/git-svn.perl b/third_party/git/git-svn.perl
new file mode 100755
index 000000000000..050f2a36f414
--- /dev/null
+++ b/third_party/git/git-svn.perl
@@ -0,0 +1,2240 @@
+#!/usr/bin/perl
+# 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 = '@@GIT_VERSION@@';
+
+use Carp qw/croak/;
+use File::Basename qw/dirname basename/;
+use File::Path qw/mkpath/;
+use File::Spec;
+use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
+use Memoize;
+
+use Git::SVN;
+use Git::SVN::Editor;
+use Git::SVN::Fetcher;
+use Git::SVN::Ra;
+use Git::SVN::Prompt;
+use Git::SVN::Log;
+use Git::SVN::Migration;
+
+use Git::SVN::Utils qw(
+	fatal
+	can_compress
+	canonicalize_path
+	canonicalize_url
+	join_paths
+	add_path_to_url
+	join_paths
+);
+
+use Git qw(
+	git_cmd_try
+	command
+	command_oneline
+	command_noisy
+	command_output_pipe
+	command_close_pipe
+	command_bidi_pipe
+	command_close_bidi_pipe
+	get_record
+);
+
+BEGIN {
+	Memoize::memoize 'Git::config';
+	Memoize::memoize 'Git::config_bool';
+}
+
+
+# From which subdir have we been invoked?
+my $cmd_dir_prefix = eval {
+	command_oneline([qw/rev-parse --show-prefix/], STDERR => 0)
+} || '';
+
+$Git::SVN::Ra::_log_window_size = 100;
+
+if (! exists $ENV{SVN_SSH} && exists $ENV{GIT_SSH}) {
+	$ENV{SVN_SSH} = $ENV{GIT_SSH};
+}
+
+if (exists $ENV{SVN_SSH} && $^O eq 'msys') {
+	$ENV{SVN_SSH} =~ s/\\/\\\\/g;
+	$ENV{SVN_SSH} =~ s/(.*)/"$1"/;
+}
+
+$Git::SVN::Log::TZ = $ENV{TZ};
+$ENV{TZ} = 'UTC';
+$| = 1; # unbuffer STDOUT
+
+# All SVN commands do it.  Otherwise we may die on SIGPIPE when the remote
+# repository decides to close the connection which we expect to be kept alive.
+$SIG{PIPE} = 'IGNORE';
+
+# Given a dot separated version number, "subtract" it from
+# the SVN::Core::VERSION; non-negaitive return means the SVN::Core
+# is at least at the version the caller asked for.
+sub compare_svn_version {
+	my (@ours) = split(/\./, $SVN::Core::VERSION);
+	my (@theirs) = split(/\./, $_[0]);
+	my ($i, $diff);
+
+	for ($i = 0; $i < @ours && $i < @theirs; $i++) {
+		$diff = $ours[$i] - $theirs[$i];
+		return $diff if ($diff);
+	}
+	return 1 if ($i < @ours);
+	return -1 if ($i < @theirs);
+	return 0;
+}
+
+sub _req_svn {
+	require SVN::Core; # use()-ing this causes segfaults for me... *shrug*
+	require SVN::Ra;
+	require SVN::Delta;
+	if (::compare_svn_version('1.1.0') < 0) {
+		fatal "Need SVN::Core 1.1.0 or better (got $SVN::Core::VERSION)";
+	}
+}
+
+$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,
+	$_before, $_after,
+	$_merge, $_strategy, $_preserve_merges, $_dry_run, $_parents, $_local,
+	$_prefix, $_no_checkout, $_url, $_verbose,
+	$_commit_url, $_tag, $_merge_info, $_interactive, $_set_svn_props);
+
+# This is a refactoring artifact so Git::SVN can get at this git-svn switch.
+sub opt_prefix { return $_prefix || '' }
+
+$Git::SVN::Fetcher::_placeholder_filename = ".gitignore";
+$_q ||= 0;
+my %remote_opts = ( 'username=s' => \$Git::SVN::Prompt::_username,
+                    'config-dir=s' => \$Git::SVN::Ra::config_dir,
+                    'no-auth-cache' => \$Git::SVN::Prompt::_no_auth_cache,
+                    'ignore-paths=s' => \$Git::SVN::Fetcher::_ignore_regex,
+                    'include-paths=s' => \$Git::SVN::Fetcher::_include_regex,
+                    'ignore-refs=s' => \$Git::SVN::Ra::_ignore_refs_regex );
+my %fc_opts = ( 'follow-parent|follow!' => \$Git::SVN::_follow_parent,
+		'authors-file|A=s' => \$_authors,
+		'authors-prog=s' => \$_authors_prog,
+		'repack:i' => \$Git::SVN::_repack,
+		'noMetadata' => \$Git::SVN::_no_metadata,
+		'useSvmProps' => \$Git::SVN::_use_svm_props,
+		'useSvnsyncProps' => \$Git::SVN::_use_svnsync_props,
+		'log-window-size=i' => \$Git::SVN::Ra::_log_window_size,
+		'no-checkout' => \$_no_checkout,
+		'quiet|q+' => \$_q,
+		'repack-flags|repack-args|repack-opts=s' =>
+		   \$Git::SVN::_repack_flags,
+		'use-log-author' => \$Git::SVN::_use_log_author,
+		'add-author-from' => \$Git::SVN::_add_author_from,
+		'localtime' => \$Git::SVN::_localtime,
+		%remote_opts );
+
+my ($_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' => \$Git::SVN::Editor::_rmdir,
+		'find-copies-harder' => \$Git::SVN::Editor::_find_copies_harder,
+		'l=i' => \$Git::SVN::Editor::_rename_limit,
+		'copy-similarity|C=i'=> \$Git::SVN::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' =>
+				\$Git::SVN::Fetcher::_preserve_empty_dirs,
+			  'placeholder-filename=s' =>
+				\$Git::SVN::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,
+			  'set-svn-props=s' => \$_set_svn_props,
+			  'revision|r=i' => \$_revision,
+			  'no-rebase' => \$_no_rebase,
+			  'mergeinfo=s' => \$_merge_info,
+			  'interactive|i' => \$_interactive,
+			%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,
+	              'parents' => \$_parents,
+	              '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,
+	           'parents' => \$_parents,
+	           '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 } ],
+        'propset' => [ \&cmd_propset,
+		       'Set the value of a property on a file or directory - will be set on commit',
+		       {} ],
+        '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",
+			{ 'B|before' => \$_before,
+			  'A|after' => \$_after } ],
+	'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,
+			  'preserve-merges|p' => \$_preserve_merges,
+			  %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::SVN::Log::_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",
+		{} ],
+);
+
+package FakeTerm;
+sub new {
+	my ($class, $reason) = @_;
+	return bless \$reason, shift;
+}
+sub readline {
+	my $self = shift;
+	die "Cannot use readline on FakeTerm: $$self";
+}
+package main;
+
+my $term;
+sub term_init {
+	$term = eval {
+		require Term::ReadLine;
+		$ENV{"GIT_SVN_NOTTY"}
+			? new Term::ReadLine 'git-svn', \*STDIN, \*STDOUT
+			: new Term::ReadLine 'git-svn';
+	};
+	if ($@) {
+		$term = new FakeTerm "$@: going non-interactive";
+	}
+}
+
+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
+if ($cmd && $cmd =~ /(?:clone|init|multi-init)$/) {
+	$ENV{GIT_DIR} ||= ".git";
+	# catch the submodule case
+	if (-f $ENV{GIT_DIR}) {
+		open(my $fh, '<', $ENV{GIT_DIR}) or
+			die "failed to open $ENV{GIT_DIR}: $!\n";
+		$ENV{GIT_DIR} = $1 if <$fh> =~ /^gitdir: (.+)$/;
+	}
+} elsif ($cmd) {
+	my ($git_dir, $cdup);
+	git_cmd_try {
+		$git_dir = command_oneline([qw/rev-parse --git-dir/]);
+	} "Unable to find .git directory\n";
+	git_cmd_try {
+		$cdup = command_oneline(qw/rev-parse --show-cdup/);
+		chomp $cdup if ($cdup);
+		$cdup = "." unless ($cdup && length $cdup);
+	} "Already at toplevel, but $git_dir not found\n";
+	$ENV{GIT_DIR} = $git_dir;
+	chdir $cdup or die "Unable to chdir up to '$cdup'\n";
+	$_repository = Git->repository(Repository => $ENV{GIT_DIR});
+}
+
+my %opts = %{$cmd{$cmd}->[2]} if (defined $cmd);
+
+read_git_config(\%opts) if $ENV{GIT_DIR};
+if ($cmd && ($cmd eq 'log' || $cmd eq 'blame')) {
+	Getopt::Long::Configure('pass_through');
+}
+my $rv = GetOptions(%opts, '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) {
+	my $abs_file = File::Spec->rel2abs($_authors_prog);
+	$_authors_prog = "'" . $abs_file . "'" if -x $abs_file;
+}
+
+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);
+	post_fetch_checkout();
+};
+fatal $@ if $@;
+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 ask {
+	my ($prompt, %arg) = @_;
+	my $valid_re = $arg{valid_re};
+	my $default = $arg{default};
+	my $resp;
+	my $i = 0;
+	term_init() unless $term;
+
+	if ( !( defined($term->IN)
+            && defined( fileno($term->IN) )
+            && defined( $term->OUT )
+            && defined( fileno($term->OUT) ) ) ){
+		return defined($default) ? $default : undef;
+	}
+
+	while ($i++ < 10) {
+		$resp = $term->readline($prompt);
+		if (!defined $resp) { # EOF
+			print "\n";
+			return defined $default ? $default : undef;
+		}
+		if ($resp eq '' and defined $default) {
+			return $default;
+		}
+		if (!defined $valid_re or $resp =~ /$valid_re/) {
+			return $resp;
+		}
+	}
+	return undef;
+}
+
+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_paths_regex = \$Git::SVN::Fetcher::_ignore_regex;
+	command_noisy('config', "$pfx.ignore-paths", $$ignore_paths_regex)
+		if defined $$ignore_paths_regex;
+	my $include_paths_regex = \$Git::SVN::Fetcher::_include_regex;
+	command_noisy('config', "$pfx.include-paths", $$include_paths_regex)
+		if defined $$include_paths_regex;
+	my $ignore_refs_regex = \$Git::SVN::Ra::_ignore_refs_regex;
+	command_noisy('config', "$pfx.ignore-refs", $$ignore_refs_regex)
+		if defined $$ignore_refs_regex;
+
+	if (defined $Git::SVN::Fetcher::_preserve_empty_dirs) {
+		my $fname = \$Git::SVN::Fetcher::_placeholder_filename;
+		command_noisy('config', "$pfx.preserve-empty-dirs", 'true');
+		command_noisy('config', "$pfx.placeholder-filename", $$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, $path) = @_;
+	if (!$url) {
+		die "SVN repository location required ",
+		    "as a command-line argument\n";
+	} elsif (!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, $ignore_branch) = @_;
+	my %result_hash = ();
+
+	merge_revs_into_hash(\%result_hash, $mergeinfo_one);
+	merge_revs_into_hash(\%result_hash, $mergeinfo_two);
+
+	delete $result_hash{$ignore_branch} if $ignore_branch;
+
+	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 = $gs->repos_root;
+		my ($target_branch) = $gs->full_pushurl =~ /^\Q$rooturl\E(.*)/;
+
+		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 =~ /^\Q$rooturl\E(.*)/) {
+				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,
+								$target_branch);
+
+			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,
+								$target_branch);
+		}
+		if ($all_parents_ok and $aggregate_mergeinfo) {
+			return $aggregate_mergeinfo;
+		}
+	}
+
+	return undef;
+}
+
+sub dcommit_rebase {
+	my ($is_last, $current, $fetched_ref, $svn_error) = @_;
+	my @diff;
+
+	if ($svn_error) {
+		print STDERR "\nERROR from SVN:\n",
+				$svn_error->expanded_message, "\n";
+	}
+	unless ($_no_rebase) {
+		# we always want to rebase against the current HEAD,
+		# not any head that was passed to us
+		@diff = command('diff-tree', $current,
+	                   $fetched_ref, '--');
+		my @finish;
+		if (@diff) {
+			@finish = rebase_cmd();
+			print STDERR "W: $current and ", $fetched_ref,
+			             " differ, using @finish:\n",
+			             join("\n", @diff), "\n";
+		} elsif ($is_last) {
+			print "No changes between ", $current, " and ",
+			      $fetched_ref,
+			      "\nResetting to the latest ",
+			      $fetched_ref, "\n";
+			@finish = qw/reset --mixed/;
+		}
+		command_noisy(@finish, $fetched_ref) if @finish;
+	}
+	if ($svn_error) {
+		die "ERROR: Not all changes have been committed into SVN"
+			.($_no_rebase ? ".\n" : ", however the committed\n"
+			."ones (if any) seem to be successfully integrated "
+			."into the working tree.\n")
+			."Please see the above messages for details.\n";
+	}
+	return @diff;
+}
+
+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."
+	}
+
+	if (defined $_interactive){
+		my $ask_default = "y";
+		foreach my $d (@$linear_refs){
+			my ($fh, $ctx) = command_output_pipe(qw(show --summary), "$d");
+			while (<$fh>){
+				print $_;
+			}
+			command_close_pipe($fh, $ctx);
+			$_ = ask("Commit this patch to SVN? ([y]es (default)|[n]o|[q]uit|[a]ll): ",
+			         valid_re => qr/^(?:yes|y|no|n|quit|q|all|a)/i,
+			         default => $ask_default);
+			die "Commit this patch reply required" unless defined $_;
+			if (/^[nq]/i) {
+				exit(0);
+			} elsif (/^a/i) {
+				last;
+			}
+		}
+	}
+
+	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 = $gs->repos_root;
+	        Git::SVN::remove_username($rooturl);
+		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 =~ /^\Q$rooturl\E(.*)/) {
+						# 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;
+	my $current_head = command_oneline(qw/rev-parse HEAD/);
+	Git::SVN::remove_username($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 => '');
+
+			my $err_handler = $SVN::Error::handler;
+			$SVN::Error::handler = sub {
+				my $err = shift;
+				dcommit_rebase(1, $current_head, $gs->refname,
+					$err);
+			};
+
+			if (!Git::SVN::Editor->new(\%ed_opts)->apply_diff) {
+				print "No changes\n$d~1 == $d\n";
+			} elsif ($parents->{$d} && @{$parents->{$d}}) {
+				$gs->{inject_parents_dcommit}->{$cmt_rev} =
+				                               $parents->{$d};
+			}
+			$_fetch_all ? $gs->fetch_all : $gs->fetch;
+			$SVN::Error::handler = $err_handler;
+			$last_rev = $cmt_rev;
+			next if $_no_rebase;
+
+			my @diff = dcommit_rebase(@$linear_refs == 0, $d,
+						$gs->refname, undef);
+
+			$rewritten_parent = command_oneline(qw/rev-parse/,
+							$gs->refname);
+
+			if (@diff) {
+				$current_head = command_oneline(qw/rev-parse
+								HEAD/);
+				@refs = ();
+				my ($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;
+				undef $last_rev;
+			}
+		}
+	}
+
+	if ($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}) {
+			my $re = Git::SVN::Editor::glob2pat($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:/) {
+		$src=~s/^http:/https:/;
+	}
+
+	::_req_svn();
+	require SVN::Client;
+
+	my ($config, $baton, undef) = Git::SVN::Ra::prepare_config_once();
+	my $ctx = SVN::Client->new(
+		auth => $baton,
+		config => $config,
+		log_msg => sub {
+			${ $_[0] } = defined $_message
+				? $_message
+				: 'Create ' . ($_tag ? 'tag ' : 'branch ' )
+				. $branch_name;
+		},
+	);
+
+	eval {
+		$ctx->ls($dst, 'HEAD', 0);
+	} and die "branch ${branch_name} already exists\n";
+
+	if ($_parents) {
+		mk_parent_dirs($ctx, $dst);
+	}
+
+	print "Copying ${src} at r${rev} to ${dst}...\n";
+	$ctx->copy($src, $rev, $dst)
+		unless $_dry_run;
+
+	# Release resources held by ctx before creating another SVN::Ra
+	# so destruction is orderly.  This seems necessary with SVN 1.9.5
+	# to avoid segfaults.
+	$ctx = undef;
+
+	$gs->fetch_all;
+}
+
+sub mk_parent_dirs {
+	my ($ctx, $parent) = @_;
+	$parent =~ s{/[^/]*$}{};
+
+	if (!eval{$ctx->ls($parent, 'HEAD', 0)}) {
+		mk_parent_dirs($ctx, $parent);
+		print "Creating parent folder ${parent} ...\n";
+		$ctx->mkdir($parent) unless $_dry_run;
+	}
+}
+
+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);
+		if ($_before) {
+			$result = $gs->find_rev_before($desired_revision, 1);
+		} elsif ($_after) {
+			$result = $gs->find_rev_after($desired_revision, 1);
+		} else {
+			$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: " . $url . "\n";
+		return;
+	}
+	if (command(qw/diff-index HEAD --/)) {
+		print STDERR "Cannot rebase with uncommitted changes:\n";
+		command_noisy('status');
+		exit 1;
+	}
+	unless ($_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);
+}
+
+# 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;
+	$path = join_paths($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_propset (PROPNAME, PROPVAL, PATH)
+# ------------------------
+# Adjust the SVN property PROPNAME to PROPVAL for PATH.
+sub cmd_propset {
+	my ($propname, $propval, $path) = @_;
+	$path = '.' if not defined $path;
+	$path = $cmd_dir_prefix . $path;
+	usage(1) if not defined $propname;
+	usage(1) if not defined $propval;
+	my $file = basename($path);
+	my $dn = dirname($path);
+	my $cur_props = Git::SVN::Editor::check_attr( "svn-properties", $path );
+	my @new_props;
+	if (!$cur_props || $cur_props eq "unset" || $cur_props eq "" || $cur_props eq "set") {
+		push @new_props, "$propname=$propval";
+	} else {
+		# TODO: handle combining properties better
+		my @props = split(/;/, $cur_props);
+		my $replaced_prop;
+		foreach my $prop (@props) {
+			# Parse 'name=value' syntax and set the property.
+			if ($prop =~ /([^=]+)=(.*)/) {
+				my ($n,$v) = ($1,$2);
+				if ($n eq $propname) {
+					$v = $propval;
+					$replaced_prop = 1;
+				}
+				push @new_props, "$n=$v";
+			}
+		}
+		if (!$replaced_prop) {
+			push @new_props, "$propname=$propval";
+		}
+	}
+	my $attrfile = "$dn/.gitattributes";
+	open my $attrfh, '>>', $attrfile or die "Can't open $attrfile: $!\n";
+	# TODO: don't simply append here if $file already has svn-properties
+	my $new_props = join(';', @new_props);
+	print $attrfh "$file svn-properties=$new_props\n" or
+		die "write to $attrfile: $!\n";
+	close $attrfh or die "close $attrfile: $!\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 = 'origin/' 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 => $svn_path );
+	if (!Git::SVN::Editor->new(\%ed_opts)->apply_diff) {
+		print "No changes\n$ta == $tb\n";
+	}
+}
+
+sub cmd_info {
+	my $path_arg = defined($_[0]) ? $_[0] : '.';
+	my $path = $path_arg;
+	if (File::Spec->file_name_is_absolute($path)) {
+		$path = canonicalize_path($path);
+
+		my $toplevel = eval {
+			my @cmd = qw/rev-parse --show-toplevel/;
+			command_oneline(\@cmd, STDERR => 0);
+		};
+
+		# remove $toplevel from the absolute path:
+		my ($vol, $dirs, $file) = File::Spec->splitpath($path);
+		my (undef, $tdirs, $tfile) = File::Spec->splitpath($toplevel);
+		my @dirs = File::Spec->splitdir($dirs);
+		my @tdirs = File::Spec->splitdir($tdirs);
+		pop @dirs if $dirs[-1] eq '';
+		pop @tdirs if $tdirs[-1] eq '';
+		push @dirs, $file;
+		push @tdirs, $tfile;
+		while (@tdirs && @dirs && $tdirs[0] eq $dirs[0]) {
+			shift @dirs;
+			shift @tdirs;
+		}
+		$dirs = File::Spec->catdir(@dirs);
+		$path = File::Spec->catpath($vol, $dirs);
+
+		$path = canonicalize_path($path);
+	} else {
+		$path = canonicalize_path($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 = canonicalize_url( add_path_to_url( $url, $path ) );
+
+	if ($_url) {
+		print "$full_url\n";
+		return;
+	}
+
+	my $result = "Path: $path_arg\n";
+	$result .= "Name: " . basename($path) . "\n" if $file_type ne "dir";
+	$result .= "URL: $full_url\n";
+
+	eval {
+		my $repos_root = $gs->repos_root;
+		Git::SVN::remove_username($repos_root);
+		$result .= "Repository Root: " . canonicalize_url($repos_root) . "\n";
+	};
+	if ($@) {
+		$result .= "Repository Root: (offline)\n";
+	}
+	::_req_svn();
+	$result .= "Repository UUID: $uuid\n" unless $diff_status eq "A" &&
+		(::compare_svn_version('1.5.4') <= 0 || $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, "--", $path);
+	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 {
+	require File::Find;
+	if (!can_compress()) {
+		warn "Compress::Zlib could not be found; unhandled.log " .
+		     "files will not be compressed.\n";
+	}
+	File::Find::find({ wanted => \&gc_directory, no_chdir => 1},
+			 Git::SVN::svn_dir());
+}
+
+########################### 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;
+	push @cmd, "--preserve-merges" if $_preserve_merges;
+	@cmd;
+}
+
+sub post_fetch_checkout {
+	return if $_no_checkout;
+	return if verify_ref('HEAD^0');
+	my $gs = $Git::SVN::_head or return;
+
+	# 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;
+		}
+	}
+
+	command_noisy(qw(update-ref HEAD), $gs->refname);
+	return unless verify_ref('HEAD^0');
+
+	return if $ENV{GIT_DIR} !~ m#^(?:.*/)?\.git$#;
+	my $index = command_oneline(qw(rev-parse --git-path 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, $path) = @_;
+
+	if ($path =~ m#^[a-z\+]+://#i) { # path is a URL
+		$path = canonicalize_url($path);
+	} else {
+		$path = canonicalize_path($path);
+		if (!defined $url || $url !~ m#^[a-z\+]+://#i) {
+			fatal("E: '$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: $switch not specified\n";
+		return;
+	}
+	if ($repo_path =~ m#^[a-z\+]+://#i) {
+		$repo_path = canonicalize_url($repo_path);
+		$ra = Git::SVN::Ra->new($repo_path);
+		$repo_path = '';
+	} else {
+		$repo_path = canonicalize_path($repo_path);
+		$repo_path =~ s#^/+##;
+		unless ($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 = join_paths( $gs->path, $repo_path );
+	$remote_path =~ s{%([0-9A-F]{2})}{chr hex($1)}ieg;
+	$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 @git_path = qw(rev-parse --git-path);
+	my $commit_editmsg = command_oneline(@git_path, 'COMMIT_EDITMSG');
+	my $commit_msg = command_oneline(@git_path, '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) {
+				$in_msg = 1 if (/^$/);
+				$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;
+		$msgbuf =~ s/\r\n/\n/sg; # SVN 1.6+ disallows CRLF
+		if ($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
+		open $log_fh, '<', $commit_msg or croak $!;
+		binmode $log_fh;
+		chomp($log_entry{log} = get_record($log_fh, undef));
+
+		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_s {
+	my $file = shift;
+	open my $fd,'<',$file or croak "$!: file: $file\n";
+	local $/;
+	my $ret = <$fd>;
+	close $fd or croak $!;
+	$ret =~ s/\s*$//s;
+	return $ret;
+}
+
+# '<svn username> = real-name <email address>' mapping based on git-svnimport:
+sub load_authors {
+	open my $authors, '<', $_authors or die "Can't open $_authors $!\n";
+	my $log = $cmd eq 'log';
+	while (<$authors>) {
+		chomp;
+		next unless /^(.+?|\(no author\))\s*=\s*(.+?)\s*<(.*)>\s*$/;
+		my ($user, $name, $email) = ($1, $2, $3);
+		if ($log) {
+			$Git::SVN::Log::rusers{"$name <$email>"} = $user;
+		} else {
+			$users{$user} = [$name, $email];
+		}
+	}
+	close $authors or croak $!;
+}
+
+# convert GetOpt::Long specs for use by git-config
+sub read_git_config {
+	my $opts = shift;
+	my @config_only;
+	foreach my $o (keys %$opts) {
+		# if we have mixedCase and a long option-only, then
+		# it's a config-only variable that we don't need for
+		# the command-line.
+		push @config_only, $o if ($o =~ /[A-Z]/ && $o =~ /^[a-z]+$/i);
+		my $v = $opts->{$o};
+		my ($key) = ($o =~ /^([a-zA-Z\-]+)/);
+		$key =~ s/-//g;
+		my $arg = 'git config';
+		$arg .= ' --int' if ($o =~ /[:=]i$/);
+		$arg .= ' --bool' if ($o !~ /[:=][sfi]$/);
+		if (ref $v eq 'ARRAY') {
+			chomp(my @tmp = `$arg --get-all svn.$key`);
+			@$v = @tmp if @tmp;
+		} else {
+			chomp(my $tmp = `$arg --get svn.$key`);
+			if ($tmp && !($arg =~ / --bool/ && $tmp eq 'false')) {
+				$$v = $tmp;
+			}
+		}
+	}
+	delete @$opts{@config_only} if @config_only;
+}
+
+sub extract_metadata {
+	my $id = shift or return (undef, undef, undef);
+	my ($url, $rev, $uuid) = ($id =~ /^\s*git-svn-id:\s+(.*)\@(\d+)
+							\s([a-f\d\-]+)$/ix);
+	if (!defined $rev || !$uuid || !$url) {
+		# some of the original repositories I made had
+		# identifiers like this:
+		($rev, $uuid) = ($id =~/^\s*git-svn-id:\s(\d+)\@([a-f\d\-]+)/i);
+	}
+	return ($url, $rev, $uuid);
+}
+
+sub cmt_metadata {
+	return extract_metadata((grep(/^git-svn-id: /,
+		command(qw/cat-file commit/, shift)))[-1]);
+}
+
+sub cmt_sha2rev_batch {
+	my %s2r;
+	my ($pid, $in, $out, $ctx) = command_bidi_pipe(qw/cat-file --batch/);
+	my $list = shift;
+
+	foreach my $sha (@{$list}) {
+		my $first = 1;
+		my $size = 0;
+		print $out $sha, "\n";
+
+		while (my $line = <$in>) {
+			if ($first && $line =~ /^[[:xdigit:]]{40}\smissing$/) {
+				last;
+			} elsif ($first &&
+			       $line =~ /^[[:xdigit:]]{40}\scommit\s(\d+)$/) {
+				$first = 0;
+				$size = $1;
+				next;
+			} elsif ($line =~ /^(git-svn-id: )/) {
+				my (undef, $rev, undef) =
+				                      extract_metadata($line);
+				$s2r{$sha} = $rev;
+			}
+
+			$size -= length($line);
+			last if ($size == 0);
+		}
+	}
+
+	command_close_bidi_pipe($pid, $in, $out, $ctx);
+
+	return \%s2r;
+}
+
+sub working_head_info {
+	my ($head, $refs) = @_;
+	my @args = qw/rev-list --first-parent --pretty=medium/;
+	my ($fh, $ctx) = command_output_pipe(@args, $head, "--");
+	my $hash;
+	my %max;
+	while (<$fh>) {
+		if ( m{^commit ($::sha1)$} ) {
+			unshift @$refs, $hash if $hash and $refs;
+			$hash = $1;
+			next;
+		}
+		next unless s{^\s*(git-svn-id:)}{$1};
+		my ($url, $rev, $uuid) = extract_metadata($_);
+		if (defined $url && defined $rev) {
+			next if $max{$url} and $max{$url} < $rev;
+			if (my $gs = Git::SVN->find_by_url($url)) {
+				my $c = $gs->rev_map_get($rev, $uuid);
+				if ($c && $c eq $hash) {
+					close $fh; # break the pipe
+					return ($url, $rev, $uuid, $gs);
+				} else {
+					$max{$url} ||= $gs->rev_map_max;
+				}
+			}
+		}
+	}
+	command_close_pipe($fh, $ctx);
+	(undef, undef, undef, undef);
+}
+
+sub read_commit_parents {
+	my ($parents, $c) = @_;
+	chomp(my $p = command_oneline(qw/rev-list --parents -1/, $c));
+	$p =~ s/^($c)\s*// or die "rev-list --parents -1 $c failed!\n";
+	@{$parents->{$c}} = split(/ /, $p);
+}
+
+sub linearize_history {
+	my ($gs, $refs) = @_;
+	my %parents;
+	foreach my $c (@$refs) {
+		read_commit_parents(\%parents, $c);
+	}
+
+	my @linear_refs;
+	my %skip = ();
+	my $last_svn_commit = $gs->last_commit;
+	foreach my $c (reverse @$refs) {
+		next if $c eq $last_svn_commit;
+		last if $skip{$c};
+
+		unshift @linear_refs, $c;
+		$skip{$c} = 1;
+
+		# we only want the first parent to diff against for linear
+		# history, we save the rest to inject when we finalize the
+		# svn commit
+		my $fp_a = verify_ref("$c~1");
+		my $fp_b = shift @{$parents{$c}} if $parents{$c};
+		if (!$fp_a || !$fp_b) {
+			die "Commit $c\n",
+			    "has no parent commit, and therefore ",
+			    "nothing to diff against.\n",
+			    "You should be working from a repository ",
+			    "originally created by git-svn\n";
+		}
+		if ($fp_a ne $fp_b) {
+			die "$c~1 = $fp_a, however parsing commit $c ",
+			    "revealed that:\n$c~1 = $fp_b\nBUG!\n";
+		}
+
+		foreach my $p (@{$parents{$c}}) {
+			$skip{$p} = 1;
+		}
+	}
+	(\@linear_refs, \%parents);
+}
+
+sub find_file_type_and_diff_status {
+	my ($path) = @_;
+	return ('dir', '') if $path eq '';
+
+	my $diff_output =
+	    command_oneline(qw(diff --cached --name-status --), $path) || "";
+	my $diff_status = (split(' ', $diff_output))[0] || "";
+
+	my $ls_tree = command_oneline(qw(ls-tree HEAD), $path) || "";
+
+	return (undef, undef) if !$diff_status && !$ls_tree;
+
+	if ($diff_status eq "A") {
+		return ("link", $diff_status) if -l $path;
+		return ("dir", $diff_status) if -d $path;
+		return ("file", $diff_status);
+	}
+
+	my $mode = (split(' ', $ls_tree))[0] || "";
+
+	return ("link", $diff_status) if $mode eq "120000";
+	return ("dir", $diff_status) if $mode eq "040000";
+	return ("file", $diff_status);
+}
+
+sub md5sum {
+	my $arg = shift;
+	my $ref = ref $arg;
+	require Digest::MD5;
+	my $md5 = Digest::MD5->new();
+        if ($ref eq 'GLOB' || $ref eq 'IO::File' || $ref eq 'File::Temp') {
+		$md5->addfile($arg) or croak $!;
+	} elsif ($ref eq 'SCALAR') {
+		$md5->add($$arg) or croak $!;
+	} elsif (!$ref) {
+		$md5->add($arg) or croak $!;
+	} else {
+		fatal "Can't provide MD5 hash for unknown ref type: '", $ref, "'";
+	}
+	return $md5->hexdigest();
+}
+
+sub gc_directory {
+	if (can_compress() && -f $_ && basename($_) eq "unhandled.log") {
+		my $out_filename = $_ . ".gz";
+		open my $in_fh, "<", $_ or die "Unable to open $_: $!\n";
+		binmode $in_fh;
+		my $gz = Compress::Zlib::gzopen($out_filename, "ab") or
+				die "Unable to open $out_filename: $!\n";
+
+		my $res;
+		while ($res = sysread($in_fh, my $str, 1024)) {
+			$gz->gzwrite($str) or
+				die "Unable to write: ".$gz->gzerror()."!\n";
+		}
+		no warnings 'once'; # $File::Find::name would warn
+		unlink $_ or die "unlink $File::Find::name: $!\n";
+	} elsif (-f $_ && basename($_) eq "index") {
+		unlink $_ or die "unlink $_: $!\n";
+	}
+}
+
+__END__
+
+Data structures:
+
+
+$remotes = { # returned by read_all_remotes()
+	'svn' => {
+		# svn-remote.svn.url=https://svn.musicpd.org
+		url => 'https://svn.musicpd.org',
+		# svn-remote.svn.fetch=mpd/trunk:trunk
+		fetch => {
+			'mpd/trunk' => 'trunk',
+		},
+		# svn-remote.svn.tags=mpd/tags/*:tags/*
+		tags => {
+			path => {
+				left => 'mpd/tags',
+				right => '',
+				regex => qr!mpd/tags/([^/]+)$!,
+				glob => 'tags/*',
+			},
+			ref => {
+				left => 'tags',
+				right => '',
+				regex => qr!tags/([^/]+)$!,
+				glob => 'tags/*',
+			},
+		}
+	}
+};
+
+$log_entry hashref as returned by libsvn_log_entry()
+{
+	log => 'whitespace-formatted log entry
+',						# trailing newline is preserved
+	revision => '8',			# integer
+	date => '2004-02-24T17:01:44.108345Z',	# commit date
+	author => 'committer name'
+};
+
+
+# this is generated by generate_diff();
+@mods = array of diff-index line hashes, each element represents one line
+	of diff-index output
+
+diff-index line ($m hash)
+{
+	mode_a => first column of diff-index output, no leading ':',
+	mode_b => second column of diff-index output,
+	sha1_b => sha1sum of the final blob,
+	chg => change type [MCRADT],
+	file_a => original file name of a file (iff chg is 'C' or 'R')
+	file_b => new/current file name of a file (any chg)
+}
+;
+
+# retval of read_url_paths{,_all}();
+$l_map = {
+	# repository root url
+	'https://svn.musicpd.org' => {
+		# repository path 		# GIT_SVN_ID
+		'mpd/trunk'		=>	'trunk',
+		'mpd/tags/0.11.5'	=>	'tags/0.11.5',
+	},
+}
+
+Notes:
+	I don't trust the each() function on unless I created %hash myself
+	because the internal iterator may not have started at base.