1 files changed, 56 insertions, 0 deletions
diff --git a/lib/PublicInbox/Gcf2.pm b/lib/PublicInbox/Gcf2.pm
new file mode 100644
index 00000000..6ac3aa18
--- /dev/null
+++ b/lib/PublicInbox/Gcf2.pm
@@ -0,0 +1,56 @@
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+#
+# git-cat-file based on libgit2
+package PublicInbox::Gcf2;
+use strict;
+use PublicInbox::Spawn qw(which popen_rd);
+use Fcntl qw(LOCK_EX);
+my (%CFG, $c_src, $lockfh);
+BEGIN {
+        # PublicInbox::Spawn will set PERL_INLINE_DIRECTORY
+        # to ~/.cache/public-inbox/inline-c if it exists
+        my $inline_dir = $ENV{PERL_INLINE_DIRECTORY} //
+                die 'PERL_INLINE_DIRECTORY not defined';
+        my $f = "$inline_dir/.public-inbox.lock";
+        open $lockfh, '>', $f or die "failed to open $f: $!\n";
+        my $pc = which($ENV{PKG_CONFIG} // 'pkg-config');
+        my ($dir) = (__FILE__ =~ m!\A(.+?)/[^/]+\z!);
+        my $rdr = {};
+        open $rdr->{2}, '>', '/dev/null' or die "open /dev/null: $!";
+        for my $x (qw(libgit2)) {
+                my $l = popen_rd([$pc, '--libs', $x], undef, $rdr);
+                $l = do { local $/; <$l> };
+                next if $?;
+                my $c = popen_rd([$pc, '--cflags', $x], undef, $rdr);
+                $c = do { local $/; <$c> };
+                next if $?;
+
+                # note: we name C source files .h to prevent
+                # ExtUtils::MakeMaker from automatically trying to
+                # build them.
+                my $f = "$dir/gcf2_$x.h";
+                if (open(my $fh, '<', $f)) {
+                        chomp($l, $c);
+                        local $/;
+                        $c_src = <$fh>;
+                        $CFG{LIBS} = $l;
+                        $CFG{CCFLAGSEX} = $c;
+                        last;
+                } else {
+                        die "E: $f: $!\n";
+                }
+        }
+        die "E: libgit2 not installed\n" unless $c_src;
+
+        # CentOS 7.x ships Inline 0.53, 0.64+ has built-in locking
+        flock($lockfh, LOCK_EX) or die "LOCK_EX failed on $f: $!\n";
+}
+
+# we use Capitalized and ALLCAPS for compatibility with old Inline::C
+use Inline C => Config => %CFG, BOOT => 'git_libgit2_init();';
+use Inline C => $c_src;
+undef $c_src;
+undef %CFG;
+undef $lockfh;
+1;