From b071c709d8798b1653d31288a977cc62b7f38e67 Mon Sep 17 00:00:00 2001
From: Tim Starling <tstarling@wikimedia.org>
Date: Mon, 21 Oct 2013 15:18:04 +1100
Subject: [PATCH] Fixes for duplicateStderr (I833aeb3a)

* Separate code from data. $2 in limit.sh is an option list.
* Don't duplicate stderr on linux when limit.sh is not used, unless
  duplicateStderr is specified

Change-Id: I8e6e74810864830c12af627bfbe75e74ba34e3e3
---
 includes/GlobalFunctions.php | 8 ++------
 includes/limit.sh            | 5 +++++
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/includes/GlobalFunctions.php b/includes/GlobalFunctions.php
index 8241d81ae9..d8e6b367b9 100644
--- a/includes/GlobalFunctions.php
+++ b/includes/GlobalFunctions.php
@@ -2773,10 +2773,6 @@ function wfShellExec( $cmd, &$retval = null, $environ = array(), $limits = array
 	$cmd = $envcmd . $cmd;
 
 	if ( php_uname( 's' ) == 'Linux' ) {
-		$stderrDuplication = '';
-		if ( $includeStderr ) {
-			$stderrDuplication = 'exec 2>&1; ';
-		}
 		$time = intval ( isset( $limits['time'] ) ? $limits['time'] : $wgMaxShellTime );
 		if ( isset( $limits['walltime'] ) ) {
 			$wallTime = intval( $limits['walltime'] );
@@ -2792,14 +2788,14 @@ function wfShellExec( $cmd, &$retval = null, $environ = array(), $limits = array
 			$cmd = '/bin/bash ' . escapeshellarg( "$IP/includes/limit.sh" ) . ' ' .
 				escapeshellarg( $cmd ) . ' ' .
 				escapeshellarg(
-					$stderrDuplication .
+					"MW_INCLUDE_STDERR=" . ( $includeStderr ? '1' : '' ) . ';' .
 					"MW_CPU_LIMIT=$time; " .
 					'MW_CGROUP=' . escapeshellarg( $wgShellCgroup ) . '; ' .
 					"MW_MEM_LIMIT=$mem; " .
 					"MW_FILE_SIZE_LIMIT=$filesize; " .
 					"MW_WALL_CLOCK_LIMIT=$wallTime"
 				);
-		} else {
+		} elseif ( $includeStderr ) {
 			$cmd .= ' 2>&1';
 		}
 	} elseif ( $includeStderr ) {
diff --git a/includes/limit.sh b/includes/limit.sh
index 6c4690ecd7..2a1545b64e 100644
--- a/includes/limit.sh
+++ b/includes/limit.sh
@@ -6,6 +6,7 @@
 # and is available on most Linux systems. If Perl was distributed with
 # BSD::Resource included, we would happily use that instead, but it isn't.
 
+MW_INCLUDE_STDERR=
 MW_CPU_LIMIT=0
 MW_CGROUP=
 MW_MEM_LIMIT=0
@@ -15,6 +16,10 @@ MW_WALL_CLOCK_LIMIT=0
 # Override settings
 eval "$2"
 
+if [ -n "$MW_INCLUDE_STDERR" ]; then
+	exec 2>&1
+fi
+
 if [ "$MW_CPU_LIMIT" -gt 0 ]; then
 	ulimit -t "$MW_CPU_LIMIT"
 fi
-- 
2.20.1