[PATCH 16/21] spawn: use autodie and PublicInbox::Lock

[Eric Wong]

It keeps Spawn.pm less noisy and ensures retries on EINTR.
---
 lib/PublicInbox/Spawn.pm | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/lib/PublicInbox/Spawn.pm b/lib/PublicInbox/Spawn.pm
index 75ef0137..0dffe064 100644
--- a/lib/PublicInbox/Spawn.pm
+++ b/lib/PublicInbox/Spawn.pm
@@ -17,7 +17,8 @@
 package PublicInbox::Spawn;
 use v5.12;
 use parent qw(Exporter);
-use Fcntl qw(LOCK_EX SEEK_SET);
+use PublicInbox::Lock;
+use Fcntl qw(SEEK_SET);
 use IO::Handle ();
 use Carp qw(croak);
 use PublicInbox::ProcessPipe;
@@ -285,26 +286,25 @@ ALL_LIBC
        $all_libc = undef unless -d _ && -w _;
        if (defined $all_libc) {
                local $ENV{PERL_INLINE_DIRECTORY} = $inline_dir;
-               my $f = "$inline_dir/.public-inbox.lock";
-               open my $oldout, '>&', \*STDOUT or die "dup(1): $!";
-               open my $olderr, '>&', \*STDERR or die "dup(2): $!";
-               open my $fh, '+>', $f or die "open($f): $!";
-               open STDOUT, '>&', $fh or die "1>$f: $!";
-               open STDERR, '>&', $fh or die "2>$f: $!";
+               use autodie;
+               # CentOS 7.x ships Inline 0.53, 0.64+ has built-in locking
+               my $lk = PublicInbox::Lock->new($inline_dir.
+                                               '/.public-inbox.lock');
+               my $fh = $lk->lock_acquire;
+               open my $oldout, '>&', \*STDOUT;
+               open my $olderr, '>&', \*STDERR;
+               open STDOUT, '>&', $fh;
+               open STDERR, '>&', $fh;
                STDERR->autoflush(1);
                STDOUT->autoflush(1);
-
-               # CentOS 7.x ships Inline 0.53, 0.64+ has built-in locking
-               flock($fh, LOCK_EX) or die "LOCK_EX($f): $!";
-               eval <<'EOM';
-use Inline C => $all_libc, BUILD_NOISY => 1;
-EOM
+               CORE::eval 'use Inline C => $all_libc, BUILD_NOISY => 1';
                my $err = $@;
-               open(STDERR, '>&', $olderr) or warn "restore stderr: $!";
-               open(STDOUT, '>&', $oldout) or warn "restore stdout: $!";
+               open(STDERR, '>&', $olderr);
+               open(STDOUT, '>&', $oldout);
                if ($err) {
                        seek($fh, 0, SEEK_SET);
                        my @msg = <$fh>;
+                       truncate($fh, 0);
                        warn "Inline::C build failed:\n", $err, "\n", @msg;
                        $all_libc = undef;
                }