git-svn: make (multi-)fetch safer but slower

get_log with explicit paths is the safest way to get revisions
that change a particular path we're interested in.
Unfortunately that means we still have to run get_log multiple
times for each path we're interested in, and even more if
a path gets deleted.

The first argument of get_log() is an array reference, but we
shouldn't use more than one element in that array ref because
the non-existence of _one_ of those paths for a particular range
would cause an error for all paths in that range, so yes, we
need multiple get_log calls to be on the safe side...

Signed-off-by: Eric Wong <normalperson@yhbt.net>

diff --git a/git-svn.perl b/git-svn.perl
index b2f86e84b4f219670d272ff829e766f2e1e7e67a..efc55156639316259a246e50d8ae7a51439b8155 100755 (executable)
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -1038,27 +1038,15 @@ sub revisions_eq {
        return 1;
 }
 
-sub match_paths {
-       my ($self, $paths) = @_;
-       return 1 if $paths->{'/'};
-       $self->{path_regex} ||= qr/^\/\Q$self->{path}\E\/?/;
-       grep /$self->{path_regex}/, keys %$paths and return 1;
-       my $c = '';
-       foreach (split m#/#, $self->rel_path) {
-               $c .= "/$_";
-               return 1 if $paths->{$c};
-       }
-       return 0;
-}
-
 sub find_parent_branch {
        my ($self, $paths, $rev) = @_;
        return undef unless $_follow_parent;
        unless (defined $paths) {
                my $err_handler = $SVN::Error::handler;
                $SVN::Error::handler = \&Git::SVN::Ra::skip_unknown_revs;
-               $self->ra->get_log([$self->{path}], $rev, $rev, 0, 1, 1,
-                                  sub { $paths = dup_changed_paths($_[0]) });
+               $self->ra->get_log([$self->{path}], $rev, $rev, 0, 1, 1, sub {
+                                  $paths =
+                                     Git::SVN::Ra::dup_changed_paths($_[0]) });
                $SVN::Error::handler = $err_handler;
        }
        return undef unless defined $paths;
@@ -1134,7 +1122,6 @@ sub find_parent_branch {
                          or die "SVN connection failed somewhere...\n";
                }
                print STDERR "Successfully followed parent\n";
-               $ed->{new_fetch} = 1;
                return $self->make_log_entry($rev, [$parent], $ed);
        }
 not_found:
@@ -1170,7 +1157,6 @@ sub do_fetch {
                        return $log_entry;
                }
                $ed = SVN::Git::Fetcher->new($self);
-               $ed->{new_fetch} = 1;
        }
        unless ($self->ra->gs_do_update($last_rev, $rev, $self, $ed)) {
                die "SVN connection failed somewhere...\n";
@@ -1243,8 +1229,6 @@ sub make_log_entry {
        my ($self, $rev, $parents, $ed) = @_;
        my $untracked = $self->get_untracked($ed);
 
-       return undef if (! $ed->{new_fetch} && ! $ed->{nr} && ! @$untracked);
-
        open my $un, '>>', "$self->{dir}/unhandled.log" or croak $!;
        print $un "r$rev\n" or croak $!;
        print $un $_, "\n" foreach @$untracked;
@@ -2314,38 +2298,53 @@ sub gs_fetch_loop_common {
        my ($self, $base, $head, @gs) = @_;
        my $inc = 1000;
        my ($min, $max) = ($base, $head < $base + $inc ? $head : $base + $inc);
-       my @paths = @gs == 1 ? ($gs[0]->{path}) : ('');
        foreach my $gs (@gs) {
                if (my $last_commit = $gs->last_commit) {
                        $gs->assert_index_clean($last_commit);
                }
        }
        while (1) {
-               my @revs;
+               my %revs;
                my $err;
                my $err_handler = $SVN::Error::handler;
                $SVN::Error::handler = sub {
                        ($err) = @_;
                        skip_unknown_revs($err);
                };
-               $self->get_log(\@paths, $min, $max, 0, 1, 1,
-                   sub { push @revs, [ dup_changed_paths($_[0]), $_[1] ]; });
-               $SVN::Error::handler = $err_handler;
-
-               if (! @revs && $err && $max >= $head) {
-                       print STDERR "Branch probably deleted:\n  ",
-                                    $err->expanded_message,
-                                    "\nWill attempt to follow revisions ",
-                                    "r$min .. r$max ",
-                                    "committed before the deletion\n";
-                       @revs = map { [ undef, $_ ] } ($min .. $max);
-               }
-               foreach (@revs) {
-                       my ($paths, $r) = @$_;
-                       foreach my $gs (@gs) {
-                               if ($paths) {
-                                       $gs->match_paths($paths) or next;
+               foreach my $gs (@gs) {
+                       $self->get_log([$gs->{path}], $min, $max, 0, 1, 1, sub
+                                      { my ($paths, $rev) = @_;
+                                        push @{$revs{$rev}},
+                                             [ $gs,
+                                               dup_changed_paths($paths) ] });
+
+                       next unless ($err && $max >= $head);
+
+                       print STDERR "Path '$gs->{path}' ",
+                                    "was probably deleted:\n",
+                                    $err->expanded_message,
+                                    "\nWill attempt to follow ",
+                                    "revisions r$min .. r$max ",
+                                    "committed before the deletion\n";
+                       my $hi = $max;
+                       while (--$hi >= $min) {
+                               my $ok;
+                               $self->get_log([$gs->{path}], $min, $hi,
+                                              0, 1, 1, sub {
+                                       my ($paths, $rev) = @_;
+                                       $ok = $rev;
+                                       push @{$revs{$rev}}, [ $gs,
+                                          dup_changed_paths($_[0])]});
+                               if ($ok) {
+                                       print STDERR "r$min .. r$ok OK\n";
+                                       last;
                                }
+                       }
+               }
+               $SVN::Error::handler = $err_handler;
+               foreach my $r (sort {$a <=> $b} keys %revs) {
+                       foreach (@{$revs{$r}}) {
+                               my ($gs, $paths) = @$_;
                                my $lr = $gs->last_rev;
                                next if defined $lr && $lr >= $r;
                                next if defined $gs->rev_db_get($r);