f4609b896f
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because there is some breakage in the git build related to the netrc credentials helper which someone has taken care of in nixpkgs. The stable channel is not used for anything other than git, so this should be fine. Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
622 lines
18 KiB
Perl
622 lines
18 KiB
Perl
package Git::SVN::Fetcher;
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use vars qw/@ISA $_ignore_regex $_include_regex $_preserve_empty_dirs
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$_placeholder_filename @deleted_gpath %added_placeholder
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$repo_id/;
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use strict;
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use warnings;
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use SVN::Delta;
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use Carp qw/croak/;
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use File::Basename qw/dirname/;
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use Git qw/command command_oneline command_noisy command_output_pipe
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command_input_pipe command_close_pipe
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command_bidi_pipe command_close_bidi_pipe
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get_record/;
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BEGIN {
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@ISA = qw(SVN::Delta::Editor);
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}
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# file baton members: path, mode_a, mode_b, pool, fh, blob, base
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sub new {
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my ($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.$repo_id.include-paths";
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$v = eval { command_oneline('config', '--get', $k) };
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$self->{include_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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my $pfx = defined($switch_path) ? $switch_path : $git_svn->path;
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$pfx .= '/' if length($pfx);
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while (defined($_ = get_record($ls, "\0"))) {
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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(?:/|$)};
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}
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# return value: 0 -- don't ignore, 1 -- ignore
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# This will also check whether the path is explicitly included
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sub is_path_ignored {
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my ($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!$self->{ignore_regex}!;
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return 0 if defined($self->{include_regex}) &&
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$path =~ m!$self->{include_regex}!;
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return 0 if defined($_include_regex) &&
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$path =~ m!$_include_regex!;
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return 1 if defined($self->{include_regex});
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return 1 if defined($_include_regex);
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return 0 unless defined($_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 ($::oid)\t\Q$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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while (defined($_ = get_record($ls, "\0"))) {
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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 ($::oid)\t\Q$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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while (defined($_ = get_record($ls, "\0"))) {
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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 $suffix = 0;
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++$suffix while $::_repository->temp_is_locked("svn_delta_${$}_$suffix");
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my $fh = $::_repository->temp_acquire("svn_delta_${$}_$suffix");
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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 = $::_repository->temp_acquire("git_blob_${$}_$suffix");
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# close_file may call temp_acquire on 'svn_hash', but because of the
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# call chain, if the temp_acquire call from close_file ends up being the
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# call that first creates the 'svn_hash' temp file, then the FileHandle
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# that's created as a result will end up in an SVN::Pool that we clear
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# in SVN::Ra::gs_fetch_loop_common. Avoid that by making sure the
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# 'svn_hash' FileHandle is already created before close_file is called.
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my $tmp_fh = $::_repository->temp_acquire('svn_hash');
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$::_repository->temp_release($tmp_fh, 1);
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if ($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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$hash =~ /^$::oid$/ or die "not an object ID: $hash\n";
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Git::temp_release($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();
|
|
}
|
|
|
|
$self->{git_commit_ok} = 1;
|
|
$self->{nr} = $self->{gii}->{nr};
|
|
delete $self->{gii};
|
|
$self->SUPER::close_edit(@_);
|
|
}
|
|
|
|
sub find_empty_directories {
|
|
my ($self) = @_;
|
|
my @empty_dirs;
|
|
my %dirs = map { dirname($_) => 1 } @deleted_gpath;
|
|
|
|
foreach my $dir (sort keys %dirs) {
|
|
next if $dir eq ".";
|
|
|
|
# If there have been any additions to this directory, there is
|
|
# no reason to check if it is empty.
|
|
my $skip_added = 0;
|
|
foreach my $t (qw/dir_prop file_prop/) {
|
|
foreach my $path (keys %{ $self->{$t} }) {
|
|
if (exists $self->{$t}->{dirname($path)}) {
|
|
$skip_added = 1;
|
|
last;
|
|
}
|
|
}
|
|
last if $skip_added;
|
|
}
|
|
next if $skip_added;
|
|
|
|
# Use `git ls-tree` to get the filenames of this directory
|
|
# that existed prior to this particular commit.
|
|
my $ls = command('ls-tree', '-z', '--name-only',
|
|
$self->{c}, "$dir/");
|
|
my %files = map { $_ => 1 } split(/\0/, $ls);
|
|
|
|
# Remove the filenames that were deleted during this commit.
|
|
delete $files{$_} foreach (@deleted_gpath);
|
|
|
|
# Report the directory if there are no filenames left.
|
|
push @empty_dirs, $dir unless (scalar %files);
|
|
}
|
|
@empty_dirs;
|
|
}
|
|
|
|
sub add_placeholder_file {
|
|
my ($self, $dir) = @_;
|
|
my $path = "$dir/$_placeholder_filename";
|
|
my $gpath = $self->git_path($path);
|
|
|
|
my $fh = $::_repository->temp_acquire($gpath);
|
|
my $hash = $::_repository->hash_and_insert_object(Git::temp_path($fh));
|
|
Git::temp_release($fh, 1);
|
|
$self->{gii}->update('100644', $hash, $gpath) or croak $!;
|
|
|
|
# The directory should no longer be considered empty.
|
|
delete $self->{empty}->{$dir} if exists $self->{empty}->{$dir};
|
|
|
|
# Keep track of any placeholder files we create.
|
|
$added_placeholder{$dir} = $path;
|
|
}
|
|
|
|
sub stash_placeholder_list {
|
|
my ($self) = @_;
|
|
my $k = "svn-remote.$repo_id.added-placeholder";
|
|
my $v = eval { command_oneline('config', '--get-all', $k) };
|
|
command_noisy('config', '--unset-all', $k) if $v;
|
|
foreach (values %added_placeholder) {
|
|
command_noisy('config', '--add', $k, $_);
|
|
}
|
|
}
|
|
|
|
1;
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
Git::SVN::Fetcher - tree delta consumer for "git svn fetch"
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use SVN::Core;
|
|
use SVN::Ra;
|
|
use Git::SVN;
|
|
use Git::SVN::Fetcher;
|
|
use Git;
|
|
|
|
my $gs = Git::SVN->find_by_url($url);
|
|
my $ra = SVN::Ra->new(url => $url);
|
|
my $editor = Git::SVN::Fetcher->new($gs);
|
|
my $reporter = $ra->do_update($SVN::Core::INVALID_REVNUM, '',
|
|
1, $editor);
|
|
$reporter->set_path('', $old_rev, 0);
|
|
$reporter->finish_report;
|
|
my $tree = $gs->tmp_index_do(sub { command_oneline('write-tree') });
|
|
|
|
foreach my $path (keys %{$editor->{dir_prop}) {
|
|
my $props = $editor->{dir_prop}{$path};
|
|
foreach my $prop (keys %$props) {
|
|
print "property $prop at $path changed to $props->{$prop}\n";
|
|
}
|
|
}
|
|
foreach my $path (keys %{$editor->{empty}) {
|
|
my $action = $editor->{empty}{$path} ? 'added' : 'removed';
|
|
print "empty directory $path $action\n";
|
|
}
|
|
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> and L<File::Basename> 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.
|