git-svn: Allow certain refs to be ignored

Implement a new --ignore-refs option which specifies a regex of refs
to ignore while importing svn history.

This is a useful supplement to the --ignore-paths option, as that
option only operates on the contents of branches and tags, not the
branches and tags themselves.

Signed-off-by: Michael Olson <mwolson@gnu.org>
Acked-by: Eric Wong <normalperson@yhbt.net>

diff --git a/git-svn.perl b/git-svn.perl
index c14d813f40189b9e9cda402af5c3edc14cf86de1..b608bbf95a9c9530af4151c3077f4fe32f3a3340 100755 (executable)
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -94,7 +94,8 @@ $_q ||= 0;
 my %remote_opts = ( 'username=s' => \$Git::SVN::Prompt::_username,
                     'config-dir=s' => \$Git::SVN::Ra::config_dir,
                     'no-auth-cache' => \$Git::SVN::Prompt::_no_auth_cache,
-                    'ignore-paths=s' => \$SVN::Git::Fetcher::_ignore_regex );
+                    'ignore-paths=s' => \$SVN::Git::Fetcher::_ignore_regex,
+                    'ignore-refs=s' => \$Git::SVN::Ra::_ignore_refs_regex );
 my %fc_opts = ( 'follow-parent|follow!' => \$Git::SVN::_follow_parent,
                'authors-file|A=s' => \$_authors,
                'authors-prog=s' => \$_authors_prog,
@@ -440,9 +441,12 @@ sub do_git_init_db {
                command_noisy('config', "$pfx.$i", $icv{$i});
                $set = $i;
        }
-       my $ignore_regex = \$SVN::Git::Fetcher::_ignore_regex;
-       command_noisy('config', "$pfx.ignore-paths", $$ignore_regex)
-               if defined $$ignore_regex;
+       my $ignore_paths_regex = \$SVN::Git::Fetcher::_ignore_regex;
+       command_noisy('config', "$pfx.ignore-paths", $$ignore_paths_regex)
+               if defined $$ignore_paths_regex;
+       my $ignore_refs_regex = \$Git::SVN::Ra::_ignore_refs_regex;
+       command_noisy('config', "$pfx.ignore-refs", $$ignore_refs_regex)
+               if defined $$ignore_refs_regex;
 
        if (defined $SVN::Git::Fetcher::_preserve_empty_dirs) {
                my $fname = \$SVN::Git::Fetcher::_placeholder_filename;
@@ -2192,6 +2196,8 @@ sub read_all_remotes {
                        $r->{$1}->{url} = $2;
                } elsif (m!^(.+)\.pushurl=\s*(.*)\s*$!) {
                        $r->{$1}->{pushurl} = $2;
+               } elsif (m!^(.+)\.ignore-refs=\s*(.*)\s*$!) {
+                       $r->{$1}->{ignore_refs_regex} = $2;
                } elsif (m!^(.+)\.(branches|tags)=$svn_refspec$!) {
                        my ($remote, $t, $local_ref, $remote_ref) =
                                                             ($1, $2, $3, $4);
@@ -2228,6 +2234,16 @@ sub read_all_remotes {
                }
        } keys %$r;
 
+       foreach my $remote (keys %$r) {
+               foreach ( grep { defined $_ }
+                         map { $r->{$remote}->{$_} } qw(branches tags) ) {
+                       foreach my $rs ( @$_ ) {
+                               $rs->{ignore_refs_regex} =
+                                   $r->{$remote}->{ignore_refs_regex};
+                       }
+               }
+       }
+
        $r;
 }
 
@@ -5383,7 +5399,7 @@ sub apply_diff {
 }
 
 package Git::SVN::Ra;
-use vars qw/@ISA $config_dir $_log_window_size/;
+use vars qw/@ISA $config_dir $_ignore_refs_regex $_log_window_size/;
 use strict;
 use warnings;
 my ($ra_invalid, $can_do_switch, %ignored_err, $RA);
@@ -5841,6 +5857,17 @@ sub get_dir_globbed {
        @finalents;
 }
 
+# return value: 0 -- don't ignore, 1 -- ignore
+sub is_ref_ignored {
+       my ($g, $p) = @_;
+       my $refname = $g->{ref}->full_path($p);
+       return 1 if defined($g->{ignore_refs_regex}) &&
+                   $refname =~ m!$g->{ignore_refs_regex}!;
+       return 0 unless defined($_ignore_refs_regex);
+       return 1 if $refname =~ m!$_ignore_refs_regex!o;
+       return 0;
+}
+
 sub match_globs {
        my ($self, $exists, $paths, $globs, $r) = @_;
 
@@ -5877,6 +5904,7 @@ sub match_globs {
                        next unless /$g->{path}->{regex}/;
                        my $p = $1;
                        my $pathname = $g->{path}->full_path($p);
+                       next if is_ref_ignored($g, $p);
                        next if $exists->{$pathname};
                        next if ($self->check_path($pathname, $r) !=
                                 $SVN::Node::dir);