зеркало из https://github.com/microsoft/git.git
605 строки
17 KiB
Perl
605 строки
17 KiB
Perl
package Git::SVN::Fetcher;
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use vars qw/@ISA $_ignore_regex $_preserve_empty_dirs $_placeholder_filename
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@deleted_gpath %added_placeholder $repo_id/;
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use strict;
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use warnings;
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use SVN::Delta;
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use Carp qw/croak/;
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use File::Basename qw/dirname/;
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use IO::File qw//;
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use Git qw/command command_oneline command_noisy command_output_pipe
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command_input_pipe command_close_pipe
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command_bidi_pipe command_close_bidi_pipe/;
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BEGIN {
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@ISA = qw(SVN::Delta::Editor);
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}
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# file baton members: path, mode_a, mode_b, pool, fh, blob, base
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sub new {
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my ($class, $git_svn, $switch_path) = @_;
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my $self = SVN::Delta::Editor->new;
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bless $self, $class;
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if (exists $git_svn->{last_commit}) {
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$self->{c} = $git_svn->{last_commit};
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$self->{empty_symlinks} =
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_mark_empty_symlinks($git_svn, $switch_path);
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}
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# some options are read globally, but can be overridden locally
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# per [svn-remote "..."] section. Command-line options will *NOT*
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# override options set in an [svn-remote "..."] section
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$repo_id = $git_svn->{repo_id};
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my $k = "svn-remote.$repo_id.ignore-paths";
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my $v = eval { command_oneline('config', '--get', $k) };
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$self->{ignore_regex} = $v;
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$k = "svn-remote.$repo_id.preserve-empty-dirs";
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$v = eval { command_oneline('config', '--get', '--bool', $k) };
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if ($v && $v eq 'true') {
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$_preserve_empty_dirs = 1;
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$k = "svn-remote.$repo_id.placeholder-filename";
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$v = eval { command_oneline('config', '--get', $k) };
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$_placeholder_filename = $v;
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}
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# Load the list of placeholder files added during previous invocations.
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$k = "svn-remote.$repo_id.added-placeholder";
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$v = eval { command_oneline('config', '--get-all', $k) };
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if ($_preserve_empty_dirs && $v) {
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# command() prints errors to stderr, so we only call it if
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# command_oneline() succeeded.
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my @v = command('config', '--get-all', $k);
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$added_placeholder{ dirname($_) } = $_ foreach @v;
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}
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$self->{empty} = {};
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$self->{dir_prop} = {};
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$self->{file_prop} = {};
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$self->{absent_dir} = {};
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$self->{absent_file} = {};
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require Git::IndexInfo;
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$self->{gii} = $git_svn->tmp_index_do(sub { Git::IndexInfo->new });
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$self->{pathnameencoding} = Git::config('svn.pathnameencoding');
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$self;
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}
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# this uses the Ra object, so it must be called before do_{switch,update},
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# not inside them (when the Git::SVN::Fetcher object is passed) to
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# do_{switch,update}
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sub _mark_empty_symlinks {
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my ($git_svn, $switch_path) = @_;
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my $bool = Git::config_bool('svn.brokenSymlinkWorkaround');
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return {} if (!defined($bool)) || (defined($bool) && ! $bool);
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my %ret;
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my ($rev, $cmt) = $git_svn->last_rev_commit;
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return {} unless ($rev && $cmt);
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# allow the warning to be printed for each revision we fetch to
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# ensure the user sees it. The user can also disable the workaround
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# on the repository even while git svn is running and the next
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# revision fetched will skip this expensive function.
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my $printed_warning;
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chomp(my $empty_blob = `git hash-object -t blob --stdin < /dev/null`);
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my ($ls, $ctx) = command_output_pipe(qw/ls-tree -r -z/, $cmt);
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local $/ = "\0";
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my $pfx = defined($switch_path) ? $switch_path : $git_svn->path;
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$pfx .= '/' if length($pfx);
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while (<$ls>) {
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chomp;
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s/\A100644 blob $empty_blob\t//o or next;
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unless ($printed_warning) {
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print STDERR "Scanning for empty symlinks, ",
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"this may take a while if you have ",
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"many empty files\n",
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"You may disable this with `",
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"git config svn.brokenSymlinkWorkaround ",
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"false'.\n",
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"This may be done in a different ",
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"terminal without restarting ",
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"git svn\n";
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$printed_warning = 1;
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}
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my $path = $_;
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my (undef, $props) =
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$git_svn->ra->get_file($pfx.$path, $rev, undef);
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if ($props->{'svn:special'}) {
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$ret{$path} = 1;
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}
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}
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command_close_pipe($ls, $ctx);
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\%ret;
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}
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# returns true if a given path is inside a ".git" directory
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sub in_dot_git {
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$_[0] =~ m{(?:^|/)\.git(?:/|$)};
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}
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# return value: 0 -- don't ignore, 1 -- ignore
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sub is_path_ignored {
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my ($self, $path) = @_;
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return 1 if in_dot_git($path);
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return 1 if defined($self->{ignore_regex}) &&
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$path =~ m!$self->{ignore_regex}!;
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return 0 unless defined($_ignore_regex);
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return 1 if $path =~ m!$_ignore_regex!o;
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return 0;
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}
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sub set_path_strip {
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my ($self, $path) = @_;
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$self->{path_strip} = qr/^\Q$path\E(\/|$)/ if length $path;
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}
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sub open_root {
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{ path => '' };
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}
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sub open_directory {
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my ($self, $path, $pb, $rev) = @_;
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{ path => $path };
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}
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sub git_path {
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my ($self, $path) = @_;
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if (my $enc = $self->{pathnameencoding}) {
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require Encode;
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Encode::from_to($path, 'UTF-8', $enc);
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}
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if ($self->{path_strip}) {
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$path =~ s!$self->{path_strip}!! or
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die "Failed to strip path '$path' ($self->{path_strip})\n";
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}
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$path;
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}
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sub delete_entry {
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my ($self, $path, $rev, $pb) = @_;
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return undef if $self->is_path_ignored($path);
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my $gpath = $self->git_path($path);
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return undef if ($gpath eq '');
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# remove entire directories.
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my ($tree) = (command('ls-tree', '-z', $self->{c}, "./$gpath")
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=~ /\A040000 tree ([a-f\d]{40})\t\Q$gpath\E\0/);
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if ($tree) {
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my ($ls, $ctx) = command_output_pipe(qw/ls-tree
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-r --name-only -z/,
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$tree);
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local $/ = "\0";
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while (<$ls>) {
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chomp;
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my $rmpath = "$gpath/$_";
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$self->{gii}->remove($rmpath);
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print "\tD\t$rmpath\n" unless $::_q;
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}
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print "\tD\t$gpath/\n" unless $::_q;
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command_close_pipe($ls, $ctx);
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} else {
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$self->{gii}->remove($gpath);
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print "\tD\t$gpath\n" unless $::_q;
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}
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# Don't add to @deleted_gpath if we're deleting a placeholder file.
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push @deleted_gpath, $gpath unless $added_placeholder{dirname($path)};
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$self->{empty}->{$path} = 0;
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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);
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goto out if $self->is_path_ignored($path);
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my $gpath = $self->git_path($path);
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($mode, $blob) = (command('ls-tree', '-z', $self->{c}, "./$gpath")
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=~ /\A(\d{6}) blob ([a-f\d]{40})\t\Q$gpath\E\0/);
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unless (defined $mode && defined $blob) {
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die "$path was not found in commit $self->{c} (r$rev)\n";
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}
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if ($mode eq '100644' && $self->{empty_symlinks}->{$path}) {
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$mode = '120000';
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}
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out:
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{ path => $path, mode_a => $mode, mode_b => $mode, blob => $blob,
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pool => SVN::Pool->new, action => 'M' };
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}
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sub add_file {
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my ($self, $path, $pb, $cp_path, $cp_rev) = @_;
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my $mode;
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if (!$self->is_path_ignored($path)) {
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my ($dir, $file) = ($path =~ m#^(.*?)/?([^/]+)$#);
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delete $self->{empty}->{$dir};
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$mode = '100644';
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if ($added_placeholder{$dir}) {
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# Remove our placeholder file, if we created one.
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delete_entry($self, $added_placeholder{$dir})
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unless $path eq $added_placeholder{$dir};
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delete $added_placeholder{$dir}
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}
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}
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{ path => $path, mode_a => $mode, mode_b => $mode,
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pool => SVN::Pool->new, action => 'A' };
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}
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sub add_directory {
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my ($self, $path, $cp_path, $cp_rev) = @_;
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goto out if $self->is_path_ignored($path);
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my $gpath = $self->git_path($path);
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if ($gpath eq '') {
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my ($ls, $ctx) = command_output_pipe(qw/ls-tree
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-r --name-only -z/,
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$self->{c});
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local $/ = "\0";
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while (<$ls>) {
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chomp;
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$self->{gii}->remove($_);
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print "\tD\t$_\n" unless $::_q;
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push @deleted_gpath, $gpath;
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}
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command_close_pipe($ls, $ctx);
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$self->{empty}->{$path} = 0;
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}
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my ($dir, $file) = ($path =~ m#^(.*?)/?([^/]+)$#);
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delete $self->{empty}->{$dir};
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$self->{empty}->{$path} = 1;
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if ($added_placeholder{$dir}) {
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# Remove our placeholder file, if we created one.
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delete_entry($self, $added_placeholder{$dir});
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delete $added_placeholder{$dir}
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}
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out:
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{ path => $path };
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}
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sub change_dir_prop {
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my ($self, $db, $prop, $value) = @_;
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return undef if $self->is_path_ignored($db->{path});
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$self->{dir_prop}->{$db->{path}} ||= {};
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$self->{dir_prop}->{$db->{path}}->{$prop} = $value;
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undef;
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}
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sub absent_directory {
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my ($self, $path, $pb) = @_;
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return undef if $self->is_path_ignored($path);
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$self->{absent_dir}->{$pb->{path}} ||= [];
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push @{$self->{absent_dir}->{$pb->{path}}}, $path;
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undef;
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}
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sub absent_file {
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my ($self, $path, $pb) = @_;
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return undef if $self->is_path_ignored($path);
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$self->{absent_file}->{$pb->{path}} ||= [];
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push @{$self->{absent_file}->{$pb->{path}}}, $path;
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undef;
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}
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sub change_file_prop {
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my ($self, $fb, $prop, $value) = @_;
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return undef if $self->is_path_ignored($fb->{path});
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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 $value ? 120000 : 100644;
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} else {
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$self->{file_prop}->{$fb->{path}} ||= {};
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$self->{file_prop}->{$fb->{path}}->{$prop} = $value;
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}
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undef;
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}
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sub apply_textdelta {
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my ($self, $fb, $exp) = @_;
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return undef if $self->is_path_ignored($fb->{path});
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my $fh = $::_repository->temp_acquire('svn_delta');
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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 = $::_repository->temp_acquire('git_blob');
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if ($fb->{blob}) {
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my ($base_is_link, $size);
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if ($fb->{mode_a} eq '120000' &&
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! $self->{empty_symlinks}->{$fb->{path}}) {
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print $base 'link ' or die "print $!\n";
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$base_is_link = 1;
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}
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retry:
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$size = $::_repository->cat_blob($fb->{blob}, $base);
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die "Failed to read object $fb->{blob}" if ($size < 0);
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if (defined $exp) {
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seek $base, 0, 0 or croak $!;
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my $got = ::md5sum($base);
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if ($got ne $exp) {
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my $err = "Checksum mismatch: ".
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"$fb->{path} $fb->{blob}\n" .
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"expected: $exp\n" .
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" got: $got\n";
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if ($base_is_link) {
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warn $err,
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"Retrying... (possibly ",
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"a bad symlink from SVN)\n";
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$::_repository->temp_reset($base);
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$base_is_link = 0;
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goto retry;
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}
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die $err;
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}
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}
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}
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seek $base, 0, 0 or croak $!;
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$fb->{fh} = $fh;
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$fb->{base} = $base;
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[ SVN::TxDelta::apply($base, $dup, 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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return undef if $self->is_path_ignored($fb->{path});
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my $hash;
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my $path = $self->git_path($fb->{path});
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if (my $fh = $fb->{fh}) {
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if (defined $exp) {
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seek($fh, 0, 0) or croak $!;
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my $got = ::md5sum($fh);
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if ($got ne $exp) {
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die "Checksum mismatch: $path\n",
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"expected: $exp\n got: $got\n";
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}
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}
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if ($fb->{mode_b} == 120000) {
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sysseek($fh, 0, 0) or croak $!;
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my $rd = sysread($fh, my $buf, 5);
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if (!defined $rd) {
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croak "sysread: $!\n";
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} elsif ($rd == 0) {
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warn "$path has mode 120000",
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" but it points to nothing\n",
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"converting to an empty file with mode",
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" 100644\n";
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$fb->{mode_b} = '100644';
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} elsif ($buf ne 'link ') {
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warn "$path has mode 120000",
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" but is not a link\n";
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} else {
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my $tmp_fh = $::_repository->temp_acquire(
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'svn_hash');
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my $res;
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while ($res = sysread($fh, my $str, 1024)) {
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my $out = syswrite($tmp_fh, $str, $res);
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defined($out) && $out == $res
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or croak("write ",
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Git::temp_path($tmp_fh),
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": $!\n");
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}
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defined $res or croak $!;
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($fh, $tmp_fh) = ($tmp_fh, $fh);
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Git::temp_release($tmp_fh, 1);
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}
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}
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$hash = $::_repository->hash_and_insert_object(
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Git::temp_path($fh));
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$hash =~ /^[a-f\d]{40}$/ or die "not a sha1: $hash\n";
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Git::temp_release($fb->{base}, 1);
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Git::temp_release($fh, 1);
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} else {
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$hash = $fb->{blob} or die "no blob information\n";
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}
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$fb->{pool}->clear;
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$self->{gii}->update($fb->{mode_b}, $hash, $path) or croak $!;
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print "\t$fb->{action}\t$path\n" if $fb->{action} && ! $::_q;
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undef;
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}
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sub abort_edit {
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my $self = shift;
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$self->{nr} = $self->{gii}->{nr};
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delete $self->{gii};
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$self->SUPER::abort_edit(@_);
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}
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sub close_edit {
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my $self = shift;
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if ($_preserve_empty_dirs) {
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my @empty_dirs;
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# Any entry flagged as empty that also has an associated
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# dir_prop represents a newly created empty directory.
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foreach my $i (keys %{$self->{empty}}) {
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push @empty_dirs, $i if exists $self->{dir_prop}->{$i};
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}
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# Search for directories that have become empty due subsequent
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# file deletes.
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push @empty_dirs, $self->find_empty_directories();
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# Finally, add a placeholder file to each empty directory.
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$self->add_placeholder_file($_) foreach (@empty_dirs);
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$self->stash_placeholder_list();
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}
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$self->{git_commit_ok} = 1;
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$self->{nr} = $self->{gii}->{nr};
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delete $self->{gii};
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$self->SUPER::close_edit(@_);
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}
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sub find_empty_directories {
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my ($self) = @_;
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my @empty_dirs;
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my %dirs = map { dirname($_) => 1 } @deleted_gpath;
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foreach my $dir (sort keys %dirs) {
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next if $dir eq ".";
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# If there have been any additions to this directory, there is
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# no reason to check if it is empty.
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my $skip_added = 0;
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foreach my $t (qw/dir_prop file_prop/) {
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foreach my $path (keys %{ $self->{$t} }) {
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if (exists $self->{$t}->{dirname($path)}) {
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$skip_added = 1;
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last;
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}
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}
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last if $skip_added;
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}
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next if $skip_added;
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# Use `git ls-tree` to get the filenames of this directory
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# that existed prior to this particular commit.
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my $ls = command('ls-tree', '-z', '--name-only',
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$self->{c}, "$dir/");
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my %files = map { $_ => 1 } split(/\0/, $ls);
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# Remove the filenames that were deleted during this commit.
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delete $files{$_} foreach (@deleted_gpath);
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# Report the directory if there are no filenames left.
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push @empty_dirs, $dir unless (scalar %files);
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}
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@empty_dirs;
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}
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sub add_placeholder_file {
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my ($self, $dir) = @_;
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my $path = "$dir/$_placeholder_filename";
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my $gpath = $self->git_path($path);
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my $fh = $::_repository->temp_acquire($gpath);
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my $hash = $::_repository->hash_and_insert_object(Git::temp_path($fh));
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Git::temp_release($fh, 1);
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$self->{gii}->update('100644', $hash, $gpath) or croak $!;
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# The directory should no longer be considered empty.
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delete $self->{empty}->{$dir} if exists $self->{empty}->{$dir};
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# Keep track of any placeholder files we create.
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$added_placeholder{$dir} = $path;
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}
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sub stash_placeholder_list {
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my ($self) = @_;
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my $k = "svn-remote.$repo_id.added-placeholder";
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my $v = eval { command_oneline('config', '--get-all', $k) };
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command_noisy('config', '--unset-all', $k) if $v;
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foreach (values %added_placeholder) {
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command_noisy('config', '--add', $k, $_);
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}
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|
}
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|
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1;
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|
__END__
|
|
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|
Git::SVN::Fetcher - tree delta consumer for "git svn fetch"
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|
|
|
=head1 SYNOPSIS
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|
|
|
use SVN::Core;
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use SVN::Ra;
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use Git::SVN;
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use Git::SVN::Fetcher;
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use Git;
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|
|
|
my $gs = Git::SVN->find_by_url($url);
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my $ra = SVN::Ra->new(url => $url);
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|
my $editor = Git::SVN::Fetcher->new($gs);
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|
my $reporter = $ra->do_update($SVN::Core::INVALID_REVNUM, '',
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|
1, $editor);
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|
$reporter->set_path('', $old_rev, 0);
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|
$reporter->finish_report;
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|
my $tree = $gs->tmp_index_do(sub { command_oneline('write-tree') });
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|
|
|
foreach my $path (keys %{$editor->{dir_prop}) {
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|
my $props = $editor->{dir_prop}{$path};
|
|
foreach my $prop (keys %$props) {
|
|
print "property $prop at $path changed to $props->{$prop}\n";
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|
}
|
|
}
|
|
foreach my $path (keys %{$editor->{empty}) {
|
|
my $action = $editor->{empty}{$path} ? 'added' : 'removed';
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|
print "empty directory $path $action\n";
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|
}
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|
foreach my $path (keys %{$editor->{file_prop}) { ... }
|
|
foreach my $parent (keys %{$editor->{absent_dir}}) {
|
|
my @children = @{$editor->{abstent_dir}{$parent}};
|
|
print "cannot fetch directory $parent/$_: not authorized?\n"
|
|
foreach @children;
|
|
}
|
|
foreach my $parent (keys %{$editor->{absent_file}) { ... }
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This is a subclass of C<SVN::Delta::Editor>, which means it implements
|
|
callbacks to act as a consumer of Subversion tree deltas. This
|
|
particular implementation of those callbacks is meant to store
|
|
information about the resulting content which B<git svn fetch> could
|
|
use to populate new commits and new entries for F<unhandled.log>.
|
|
More specifically:
|
|
|
|
=over
|
|
|
|
=item * Additions, removals, and modifications of files are propagated
|
|
to git-svn's index file F<$GIT_DIR/svn/$refname/index> using
|
|
B<git update-index>.
|
|
|
|
=item * Changes in Subversion path properties are recorded in the
|
|
C<dir_prop> and C<file_prop> fields (which are hashes).
|
|
|
|
=item * Addition and removal of empty directories are indicated by
|
|
entries with value 1 and 0 respectively in the C<empty> hash.
|
|
|
|
=item * Paths that are present but cannot be conveyed (presumably due
|
|
to permissions) are recorded in the C<absent_file> and
|
|
C<absent_dirs> hashes. For each key, the corresponding value is
|
|
a list of paths under that directory that were present but
|
|
could not be conveyed.
|
|
|
|
=back
|
|
|
|
The interface is unstable. Do not use this module unless you are
|
|
developing git-svn.
|
|
|
|
=head1 DEPENDENCIES
|
|
|
|
L<SVN::Delta> from the Subversion perl bindings,
|
|
the core L<Carp>, L<File::Basename>, and L<IO::File> modules,
|
|
and git's L<Git> helper module.
|
|
|
|
C<Git::SVN::Fetcher> has not been tested using callers other than
|
|
B<git-svn> itself.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<SVN::Delta>,
|
|
L<Git::SVN::Editor>.
|
|
|
|
=head1 INCOMPATIBILITIES
|
|
|
|
None reported.
|
|
|
|
=head1 BUGS
|
|
|
|
None.
|