[PATCH 15/21] gcf2: use PublicInbox::Lock

[Eric Wong]

It auto-retries on EINTR and saves us the trouble of doing so.
---
 lib/PublicInbox/Gcf2.pm | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/PublicInbox/Gcf2.pm b/lib/PublicInbox/Gcf2.pm
index 0f4d2bf0..37262e28 100644
--- a/lib/PublicInbox/Gcf2.pm
+++ b/lib/PublicInbox/Gcf2.pm
@@ -6,10 +6,11 @@
 package PublicInbox::Gcf2;
 use v5.12;
 use PublicInbox::Spawn qw(which popen_rd); # may set PERL_INLINE_DIRECTORY
-use Fcntl qw(LOCK_EX SEEK_SET);
+use Fcntl qw(SEEK_SET);
 use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
 use IO::Handle; # autoflush
 use PublicInbox::Git;
+use PublicInbox::Lock;
 
 BEGIN {
        use autodie;
@@ -18,10 +19,10 @@ BEGIN {
        # to ~/.cache/public-inbox/inline-c if it exists and Inline::C works
        my $inline_dir = $ENV{PERL_INLINE_DIRECTORY} //
                die 'PERL_INLINE_DIRECTORY not defined';
-       open my $fh, '+>', "$inline_dir/.public-inbox.lock";
 
        # CentOS 7.x ships Inline 0.53, 0.64+ has built-in locking
-       flock($fh, LOCK_EX);
+       my $lk = PublicInbox::Lock->new("$inline_dir/.public-inbox.lock");
+       my $fh = $lk->lock_acquire;
 
        my $pc = which($ENV{PKG_CONFIG} // 'pkg-config') //
                die "pkg-config missing for libgit2";
@@ -74,6 +75,7 @@ EOM
        if ($err) {
                seek($fh, 0, SEEK_SET);
                my @msg = <$fh>;
+               truncate($fh, 0);
                die "Inline::C Gcf2 build failed:\n", $err, "\n", @msg;
        }
 }