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git-svn: exclude already merged tips using one rev-list call

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The old function would have to check all mentioned merge tips, every time
that the mergeinfo ticket changed.  This involved 1-2 rev-list operation
for each listed mergeinfo line.  If there are a lot of feature branches
being merged into a trunk, this makes for a very expensive operation for
detecting the new parents on every merge.

This new version first uses a single 'rev-list' to figure out which commit
ranges are already reachable from the parents.  This is used to eliminate
the already merged branches from the list.

Signed-off-by: Sam Vilain <sam@vilain.net>
Acked-by: Eric Wong <normalperson@yhbt.net>
This commit is contained in:
Sam Vilain 2009-12-20 05:25:31 +13:00 committed by Eric Wong
parent 33973a5b17
commit ea020cbd6a
1 changed files with 48 additions and 4 deletions
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52
git-svn.perl
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@ -3038,6 +3038,41 @@ BEGIN {
memoize 'lookup_svn_merge';
}
sub parents_exclude {
my $parents = shift;
my @commits = @_;
return unless @commits;
my @excluded;
my $excluded;
do {
my @cmd = ('rev-list', "-1", @commits, "--not", @$parents );
$excluded = command_oneline(@cmd);
if ( $excluded ) {
my @new;
my $found;
for my $commit ( @commits ) {
if ( $commit eq $excluded ) {
push @excluded, $commit;
$found++;
last;
}
else {
push @new, $commit;
}
}
die "saw commit '$excluded' in rev-list output, "
."but we didn't ask for that commit (wanted: @commits --not @$parents)"
unless $found;
@commits = @new;
}
}
while ($excluded and @commits);
return @excluded;
}
# note: this function should only be called if the various dirprops
# have actually changed
sub find_extra_svn_parents {
@ -3050,23 +3085,32 @@ sub find_extra_svn_parents {
# are now marked as merge, we can add the tip as a parent.
my @merges = split "\n", $mergeinfo;
my @merge_tips;
my @merged_commit_ranges;
my $url = $self->rewrite_root || $self->{url};
my $uuid = $self->ra_uuid;
my %ranges;
for my $merge ( @merges ) {
my ($tip_commit, @ranges) =
lookup_svn_merge( $uuid, $url, $merge );
push @merged_commit_ranges, @ranges;
unless (!$tip_commit or
grep { $_ eq $tip_commit } @$parents ) {
push @merge_tips, $tip_commit;
$ranges{$tip_commit} = \@ranges;
} else {
push @merge_tips, undef;
}
}
my %excluded = map { $_ => 1 }
parents_exclude($parents, grep { defined } @merge_tips);
# check merge tips for new parents
my @new_parents;
for my $merge_tip ( @merge_tips ) {
my $spec = shift @merges;
next unless $merge_tip;
next unless $merge_tip and $excluded{$merge_tip};
my $ranges = $ranges{$merge_tip};
my @cmd = ('rev-list', "-1", $merge_tip,
"--not", @$parents );
my ($msg_fh, $ctx) = command_output_pipe(@cmd);
@ -3076,7 +3120,7 @@ sub find_extra_svn_parents {
}
command_close_pipe($msg_fh, $ctx);
if ( $new ) {
push @cmd, @merged_commit_ranges;
push @cmd, @$ranges;
my ($msg_fh, $ctx) = command_output_pipe(@cmd);
my $unmerged;
while ( <$msg_fh> ) {