[PATCH 4/3] searchidx: avoid holding Xapian lock in cat-file

[Eric Wong <e@80x24.org>]

We must ensure cat-file process is launched before Xapian
grabs lock, too.  Our use of "git cat-file --batch" has
the same problem as "git log" did, (which was fixed in
commit 3713c727cda431a0dc2865a7878c13ecf9f21851)
"searchidx: release Xapian FDs before spawning git log"
---
 lib/PublicInbox/Git.pm       | 4 +++-
 lib/PublicInbox/SearchIdx.pm | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index f47bc43..59c2747 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -39,7 +39,7 @@ sub _bidi_pipe {
 sub cat_file {
 	my ($self, $obj, $ref) = @_;
 
-	$self->_bidi_pipe(qw(--batch in out pid));
+	batch_prepare($self);
 	$self->{out}->print($obj, "\n") or fail($self, "write error: $!");
 
 	my $in = $self->{in};
@@ -89,6 +89,8 @@ sub cat_file {
 	$rv;
 }
 
+sub batch_prepare ($) { _bidi_pipe($_[0], qw(--batch in out pid)) }
+
 sub check {
 	my ($self, $obj) = @_;
 	$self->_bidi_pipe(qw(--batch-check in_c out_c pid_c));
diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 6efc1f3..0582526 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -390,6 +390,7 @@ sub _index_sync {
 	my $tip = $opts->{ref} || 'HEAD';
 	my $reindex = $opts->{reindex};
 	my ($mkey, $last_commit, $lx, $xlog);
+	$self->{git}->batch_prepare;
 	my $xdb = _xdb_acquire($self);
 	$xdb->begin_transaction;
 	do {
-- 
EW