[PATCH] solvergit: don't drop update-index stdin with qspawn

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

It's possible for Qspawn callers to be deferred, in which case
we must ensure we don't cause the temporary file used for
stdin to become unref-ed and closed.

This can be a problem when we exceed the default Qspawn
limiter of 32 concurrent processes for "git update-index".
---
 lib/PublicInbox/SolverGit.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/PublicInbox/SolverGit.pm b/lib/PublicInbox/SolverGit.pm
index 58869ffb..49f94895 100644
--- a/lib/PublicInbox/SolverGit.pm
+++ b/lib/PublicInbox/SolverGit.pm
@@ -241,7 +241,7 @@ sub prepare_index ($) {
 	sysseek($in, 0, 0) or die "seek: $!";
 
 	dbg($self, 'preparing index');
-	my $rdr = { 0 => fileno($in) };
+	my $rdr = { 0 => fileno($in), -hold => $in };
 	my $cmd = [ qw(git update-index -z --index-info) ];
 	my $qsp = PublicInbox::Qspawn->new($cmd, $self->{git_env}, $rdr);
 	$qsp->psgi_qx($self->{psgi_env}, undef, sub {
-- 
2.22.0.rc1.1.g3e0570f6ac