[PATCH 2/5] import: check for git->qx errors, clearer return values

[Eric Wong <e@80x24.org>]

Those git commands can fail and git->qx will set $? when it
fails.  There's no need for the extra indirection of the @ret
array, either.

Improve git->qx coverage to check for $? while we're at it.
---
 lib/PublicInbox/Import.pm | 9 +++++----
 t/git.t                   | 4 ++++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/lib/PublicInbox/Import.pm b/lib/PublicInbox/Import.pm
index 2cb4896a..e0a84bfd 100644
--- a/lib/PublicInbox/Import.pm
+++ b/lib/PublicInbox/Import.pm
@@ -48,7 +48,7 @@ sub gfi_start {
 
 	return ($self->{in}, $self->{out}) if $self->{pid};
 
-	my (@ret, $out_r, $out_w);
+	my ($in_r, $pid, $out_r, $out_w);
 	pipe($out_r, $out_w) or die "pipe failed: $!";
 
 	$self->lock_acquire;
@@ -56,27 +56,28 @@ sub gfi_start {
 		my ($git, $ref) = @$self{qw(git ref)};
 		local $/ = "\n";
 		chomp($self->{tip} = $git->qx(qw(rev-parse --revs-only), $ref));
+		die "fatal: rev-parse --revs-only $ref: \$?=$?" if $?;
 		if ($self->{path_type} ne '2/38' && $self->{tip}) {
 			local $/ = "\0";
 			my @t = $git->qx(qw(ls-tree -r -z --name-only), $ref);
+			die "fatal: ls-tree -r -z --name-only $ref: \$?=$?" if $?;
 			chomp @t;
 			$self->{-tree} = { map { $_ => 1 } @t };
 		}
 		my @cmd = ('git', "--git-dir=$git->{git_dir}",
 			qw(fast-import --quiet --done --date-format=raw));
-		my ($in_r, $pid) = popen_rd(\@cmd, undef, { 0 => $out_r });
+		($in_r, $pid) = popen_rd(\@cmd, undef, { 0 => $out_r });
 		$out_w->autoflush(1);
 		$self->{in} = $in_r;
 		$self->{out} = $out_w;
 		$self->{pid} = $pid;
 		$self->{nchg} = 0;
-		@ret = ($in_r, $out_w);
 	};
 	if ($@) {
 		$self->lock_release;
 		die $@;
 	}
-	@ret;
+	($in_r, $out_w);
 }
 
 sub wfail () { die "write to fast-import failed: $!" }
diff --git a/t/git.t b/t/git.t
index dcd053c5..2cfff248 100644
--- a/t/git.t
+++ b/t/git.t
@@ -76,13 +76,17 @@ if (1) {
 	is(length($$x), $size, 'read correct number of bytes');
 
 	my $ref = $gcf->qx(qw(cat-file blob), $buf);
+	is($?, 0, 'no error on scalar success');
 	my @ref = $gcf->qx(qw(cat-file blob), $buf);
+	is($?, 0, 'no error on wantarray success');
 	my $nl = scalar @ref;
 	ok($nl > 1, "qx returned array length of $nl");
 	is(join('', @ref), $ref, 'qx array and scalar context both work');
 
 	$gcf->qx(qw(repack -adq));
 	ok($gcf->packed_bytes > 0, 'packed size is positive');
+	$gcf->qx(qw(rev-parse --verify bogus));
+	isnt($?, 0, '$? set on failure'.$?);
 }
 
 SKIP: {