user/dev discussion of public-inbox itself
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From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH] index: "git log" failures are fatal
Date: Mon,  4 Nov 2019 00:43:14 +0000
Message-ID: <20191104004314.3220-1-e@80x24.org> (raw)

While I've never seen "git log" fail on its own, it could happen
one day and we should be prepared to abort indexing when it
happens.

Beef up tests for t/spawn.t to ensure close() behaves
on popen_rd the way we expect it to.
---
 lib/PublicInbox/SearchIdx.pm  | 8 ++++++--
 lib/PublicInbox/V2Writable.pm | 5 +++--
 t/spawn.t                     | 4 ++--
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index b2d71a1f..f265fa7f 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -590,6 +590,7 @@ sub read_log {
 			$newest ||= $latest;
 		}
 	}
+	close($log) or die "git log failed: \$?=$?";
 	# get the leftovers
 	foreach my $blob (keys %D) {
 		my $mime = do_cat_mail($git, $blob, \$bytes) or next;
@@ -632,7 +633,7 @@ sub _git_log {
 			     --no-notes --no-color --no-renames
 			     --diff-filter=AM), $range);
 	++$fcount while <$fh>;
-	close $fh;
+	close $fh or die "git log failed: \$?=$?";
 	my $high = $self->{mm}->num_highwater;
 	$pr->("$fcount\n") if $pr; # continue previous line
 	$self->{ntodo} = $fcount;
@@ -713,7 +714,10 @@ sub _index_sync {
 	my $xdb = $self->begin_txn_lazy;
 	my $mm = _msgmap_init($self);
 	do {
-		$xlog = undef;
+		if ($xlog) {
+			close($xlog) or die "git log failed: \$?=$?";
+			$xlog = undef;
+		}
 		$last_commit = _last_x_commit($self, $mm);
 		$lx = reindex_from($opts->{reindex}, $last_commit);
 
diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index 1825da2c..02f313b0 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -1128,6 +1128,7 @@ sub sync_prepare ($$$) {
 				--no-notes --no-color --no-renames
 				--diff-filter=AM), $range, '--', 'm');
 		++$n while <$fh>;
+		close $fh or die "git log failed: \$?=$?";
 		$pr->("$n\n") if $pr;
 		$regen_max += $n;
 	}
@@ -1195,7 +1196,7 @@ sub unindex ($$$$) {
 		unindex_oid($self, $git, $1, $unindexed);
 	}
 	delete $self->{reindex_pipe};
-	$fh = undef;
+	close $fh or die "git log failed: \$?=$?";
 
 	return unless $sync->{-opt}->{prune};
 	my $after = scalar keys %$unindexed;
@@ -1251,7 +1252,7 @@ sub index_epoch ($$$) {
 			mark_deleted($self, $sync, $git, $1);
 		}
 	}
-	$fh = undef;
+	close $fh or die "git log failed: \$?=$?";
 	delete $self->{reindex_pipe};
 	update_last_commit($self, $git, $i, $cmt) if defined $cmt;
 }
diff --git a/t/spawn.t b/t/spawn.t
index aba1a26c..ebebfb57 100644
--- a/t/spawn.t
+++ b/t/spawn.t
@@ -71,13 +71,13 @@ use PublicInbox::Spawn qw(which spawn popen_rd);
 	is($buf, "hello\n", 'tied gets works');
 	is(sysread($fh, $buf, 6), 0, 'sysread got EOF');
 	$? = 1;
-	close $fh;
+	ok(close($fh), 'close succeeds');
 	is($?, 0, '$? set properly');
 }
 
 {
 	my $fh = popen_rd([qw(false)]);
-	close $fh;
+	ok(!close($fh), 'close fails on false');
 	isnt($?, 0, '$? set properly: '.$?);
 }
 

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