git-svn: enable delta transfers during fetches when using SVN:: libs
This should drastically reduce bandwidth used for network transfers. This is not enabled for file:// repositories by default because of the increased CPU usage and I/O needed. GIT_SVN_DELTA_FETCH may be set to a true value to enable or false (0) to disable delta transfers regardless of the repository type. Signed-off-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Eric Wong
Junio C Hamano
parent
f0df4ed562
commit
27a1a8014b
188
git-svn.perl
188
git-svn.perl
@ -68,7 +68,7 @@ my ($_revision,$_stdin,$_no_ignore_ext,$_no_stop_copy,$_help,$_rmdir,$_edit,
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$_limit, $_verbose, $_incremental, $_oneline, $_l_fmt, $_show_commit,
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$_version, $_upgrade, $_authors, $_branch_all_refs, @_opt_m,
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$_merge, $_strategy, $_dry_run, $_ignore_nodate, $_non_recursive,
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$_username, $_config_dir, $_no_auth_cache);
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$_username, $_config_dir, $_no_auth_cache, $_xfer_delta);
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my (@_branch_from, %tree_map, %users, %rusers, %equiv);
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my ($_svn_co_url_revs, $_svn_pg_peg_revs);
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my @repo_path_split_cache;
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@ -2675,6 +2675,9 @@ sub libsvn_load {
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require SVN::Ra;
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require SVN::Delta;
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push @SVN::Git::Editor::ISA, 'SVN::Delta::Editor';
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push @SVN::Git::Fetcher::ISA, 'SVN::Delta::Editor';
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*SVN::Git::Fetcher::process_rm = *process_rm;
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*SVN::Git::Fetcher::safe_qx = *safe_qx;
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my $kill_stupid_warnings = $SVN::Node::none.$SVN::Node::file.
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$SVN::Node::dir.$SVN::Node::unknown.
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$SVN::Node::none.$SVN::Node::file.
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@ -2827,6 +2830,13 @@ sub libsvn_connect {
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config => $config,
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pool => SVN::Pool->new,
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auth_provider_callbacks => $callbacks);
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my $df = $ENV{GIT_SVN_DELTA_FETCH};
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if (defined $df) {
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$_xfer_delta = $df;
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} else {
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$_xfer_delta = ($url =~ m#^file://#) ? undef : 1;
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}
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$ra->{svn_path} = $url;
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$ra->{repos_root} = $ra->get_repos_root;
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$ra->{svn_path} =~ s#^\Q$ra->{repos_root}\E/*##;
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@ -2915,6 +2925,24 @@ sub process_rm {
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}
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sub libsvn_fetch {
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$_xfer_delta ? libsvn_fetch_delta(@_) : libsvn_fetch_full(@_);
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}
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sub libsvn_fetch_delta {
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my ($last_commit, $paths, $rev, $author, $date, $msg) = @_;
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my $pool = SVN::Pool->new;
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my $ed = SVN::Git::Fetcher->new({ c => $last_commit, ra => $SVN,
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paths => $paths });
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my $reporter = $SVN->do_update($rev, '', 1, $ed, $pool);
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my @lock = $SVN::Core::VERSION ge '1.2.0' ? (undef) : ();
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my (undef, $last_rev, undef) = cmt_metadata($last_commit);
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$reporter->set_path('', $last_rev, 0, @lock, $pool);
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$reporter->finish_report($pool);
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$pool->clear;
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libsvn_log_entry($rev, $author, $date, $msg, [$last_commit]);
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}
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sub libsvn_fetch_full {
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my ($last_commit, $paths, $rev, $author, $date, $msg) = @_;
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open my $gui, '| git-update-index -z --index-info' or croak $!;
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my @amr;
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@ -3133,7 +3161,11 @@ sub libsvn_find_parent_branch {
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unlink $GIT_SVN_INDEX;
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print STDERR "Found branch parent: ($GIT_SVN) $parent\n";
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sys(qw/git-read-tree/, $parent);
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return libsvn_fetch($parent, $paths, $rev,
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# I can't seem to get do_switch() to work correctly with
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# the SWIG interface (TypeError when passing switch_url...),
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# so we'll unconditionally bypass the delta interface here
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# for now
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return libsvn_fetch_full($parent, $paths, $rev,
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$author, $date, $msg);
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}
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print STDERR "Nope, branch point not imported or unknown\n";
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@ -3153,9 +3185,19 @@ sub libsvn_new_tree {
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return $log_entry;
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}
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my ($paths, $rev, $author, $date, $msg) = @_;
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if ($_xfer_delta) {
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my $pool = SVN::Pool->new;
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my $ed = SVN::Git::Fetcher->new({paths => $paths, ra => $SVN});
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my $reporter = $SVN->do_update($rev, '', 1, $ed, $pool);
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my @lock = $SVN::Core::VERSION ge '1.2.0' ? (undef) : ();
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$reporter->set_path('', $rev, 1, @lock, $pool);
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$reporter->finish_report($pool);
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$pool->clear;
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} else {
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open my $gui, '| git-update-index -z --index-info' or croak $!;
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libsvn_traverse($gui, '', $SVN->{svn_path}, $rev);
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close $gui or croak $?;
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}
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return libsvn_log_entry($rev, $author, $date, $msg);
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}
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@ -3325,6 +3367,148 @@ sub copy_remote_ref {
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"refs/remotes/$GIT_SVN on $origin\n";
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}
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}
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package SVN::Git::Fetcher;
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use vars qw/@ISA/;
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use strict;
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use warnings;
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use Carp qw/croak/;
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use IO::File qw//;
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# file baton members: path, mode_a, mode_b, pool, fh, blob, base
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sub new {
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my ($class, $git_svn) = @_;
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my $self = SVN::Delta::Editor->new;
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bless $self, $class;
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open my $gui, '| git-update-index -z --index-info' or croak $!;
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$self->{gui} = $gui;
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$self->{c} = $git_svn->{c} if exists $git_svn->{c};
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if (my $p = $git_svn->{paths} && $git_svn->{ra}) {
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my $s = $git_svn->{ra}->{svn_path};
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$s = length $s ? qr#^/\Q$s\E/# : qr#^/#;
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$self->{paths} = { map { my $x = $_;
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$x =~ s/$s//;
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$x => $p->{$_} } keys %$p };
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}
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require Digest::MD5;
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$self;
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}
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sub delete_entry {
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my ($self, $path, $rev, $pb) = @_;
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process_rm($self->{gui}, $self->{c}, $path);
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undef;
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}
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sub open_file {
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my ($self, $path, $pb, $rev) = @_;
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my ($mode, $blob) = (safe_qx('git-ls-tree',$self->{c},'--',$path)
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=~ /^(\d{6}) blob ([a-f\d]{40})\t/);
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{ path => $path, mode_a => $mode, mode_b => $mode, blob => $blob,
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pool => SVN::Pool->new };
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}
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sub add_file {
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my ($self, $path, $pb, $cp_path, $cp_rev) = @_;
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{ path => $path, mode_a => 100644, mode_b => 100644,
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pool => SVN::Pool->new };
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}
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sub change_file_prop {
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my ($self, $fb, $prop, $value) = @_;
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if ($prop eq 'svn:executable') {
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if ($fb->{mode_b} != 120000) {
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$fb->{mode_b} = defined $value ? 100755 : 100644;
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}
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} elsif ($prop eq 'svn:special') {
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$fb->{mode_b} = defined $value ? 120000 : 100644;
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}
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undef;
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}
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sub apply_textdelta {
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my ($self, $fb, $exp) = @_;
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my $fh = IO::File->new_tmpfile;
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$fh->autoflush(1);
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# $fh gets auto-closed() by SVN::TxDelta::apply(),
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# (but $base does not,) so dup() it for reading in close_file
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open my $dup, '<&', $fh or croak $!;
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my $base = IO::File->new_tmpfile;
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$base->autoflush(1);
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if ($fb->{blob}) {
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defined (my $pid = fork) or croak $!;
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if (!$pid) {
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open STDOUT, '>&', $base or croak $!;
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print STDOUT 'link ' if ($fb->{mode_a} == 120000);
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exec qw/git-cat-file blob/, $fb->{blob} or croak $!;
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}
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waitpid $pid, 0;
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croak $? if $?;
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if (defined $exp) {
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seek $base, 0, 0 or croak $!;
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my $md5 = Digest::MD5->new;
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$md5->addfile($base);
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my $got = $md5->hexdigest;
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die "Checksum mismatch: $fb->{path} $fb->{blob}\n",
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"expected: $exp\n",
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" got: $got\n" if ($got ne $exp);
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}
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}
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seek $base, 0, 0 or croak $!;
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$fb->{fh} = $dup;
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$fb->{base} = $base;
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[ SVN::TxDelta::apply($base, $fh, undef, $fb->{path}, $fb->{pool}) ];
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}
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sub close_file {
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my ($self, $fb, $exp) = @_;
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my $hash;
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my $path = $fb->{path};
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if (my $fh = $fb->{fh}) {
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seek($fh, 0, 0) or croak $!;
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my $md5 = Digest::MD5->new;
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$md5->addfile($fh);
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my $got = $md5->hexdigest;
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die "Checksum mismatch: $path\n",
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"expected: $exp\n got: $got\n" if ($got ne $exp);
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seek($fh, 0, 0) or croak $!;
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if ($fb->{mode_b} == 120000) {
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read($fh, my $buf, 5) == 5 or croak $!;
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$buf eq 'link ' or die "$path has mode 120000",
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"but is not a link\n";
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}
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defined(my $pid = open my $out,'-|') or die "Can't fork: $!\n";
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if (!$pid) {
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open STDIN, '<&', $fh or croak $!;
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exec qw/git-hash-object -w --stdin/ or croak $!;
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}
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chomp($hash = do { local $/; <$out> });
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close $out or croak $!;
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close $fh or croak $!;
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$hash =~ /^[a-f\d]{40}$/ or die "not a sha1: $hash\n";
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close $fb->{base} or croak $!;
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} else {
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$hash = $fb->{blob} or die "no blob information\n";
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}
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$fb->{pool}->clear;
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my $gui = $self->{gui};
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print $gui "$fb->{mode_b} $hash\t$path\0" or croak $!;
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print "\t", $self->{paths}->{$path}->action,
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"\t$path\n" if defined $self->{paths}->{$path};
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undef;
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}
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sub abort_edit {
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my $self = shift;
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close $self->{gui};
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$self->SUPER::abort_edit(@_);
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}
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sub close_edit {
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my $self = shift;
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close $self->{gui} or croak;
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$self->SUPER::close_edit(@_);
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}
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package SVN::Git::Editor;
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use vars qw/@ISA/;
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