[PATCH 4/9] lei: write daemon errors to the sock directory

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

Most everything should be captured by the __WARN__ handlers and
routed to syslog, but it appears Perl may write to stderr in
some emergency cases, as can libc or other libraries.  Just
point it to a small file that's cleared on reboot.
---
 lib/PublicInbox/LEI.pm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/LEI.pm b/lib/PublicInbox/LEI.pm
index 802d2cd9..e4f8bedb 100644
--- a/lib/PublicInbox/LEI.pm
+++ b/lib/PublicInbox/LEI.pm
@@ -830,7 +830,9 @@ sub lazy_start {
 	require PublicInbox::Listener;
 	require PublicInbox::EOFpipe;
 	(-p STDOUT) or die "E: stdout must be a pipe\n";
-	open(STDIN, '+<', '/dev/null') or die "redirect stdin failed: $!";
+	my ($err) = ($path =~ m!\A(.+?/)[^/]+\z!);
+	$err .= 'errors.log';
+	open(STDIN, '+>>', $err) or die "open($err): $!";
 	POSIX::setsid() > 0 or die "setsid: $!";
 	my $pid = fork // die "fork: $!";
 	return if $pid;