[PATCH 3/6] lei_blob: use ProcessPipe to eliminate a waitpid call

[Eric Wong]

waitpid with a positive PID isn't going to return anything
else unless we set ($SIG{CHLD} = 'IGNORE').
---
 lib/PublicInbox/LeiBlob.pm | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/PublicInbox/LeiBlob.pm b/lib/PublicInbox/LeiBlob.pm
index 5fc6d902..1d8267c8 100644
--- a/lib/PublicInbox/LeiBlob.pm
+++ b/lib/PublicInbox/LeiBlob.pm
@@ -21,10 +21,9 @@ sub get_git_dir ($$) {
        } else { # implicit --cwd, quiet errors
                open $opt->{2}, '>', '/dev/null' or die "open /dev/null: $!";
        }
-       my ($r, $pid) = popen_rd($cmd, {GIT_DIR => undef}, $opt);
+       my $r = popen_rd($cmd, {GIT_DIR => undef}, $opt);
        chomp(my $gd = do { local $/; <$r> });
-       waitpid($pid, 0) == $pid or die "BUG: waitpid @$cmd ($!)";
-       $? == 0 ? $gd : undef;
+       close($r) ? $gd : undef;
 }
 
 sub solver_user_cb { # called by solver when done