From be26421f455e392178c98328d142d1d2494e0ede Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Thu, 10 Jul 2014 19:16:27 +0000
Subject: [PATCH] sysupgrade: Enable killing of all processes under upgraded
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

If the sysupgrade scripts is called under upgraded, it will not kill all
other processes as it should to avoid interference by locked filesystem.
This patch checks the parent and if it is upgraded, it kills all.

Signed-off-by: André Valentin <avalentin@marcant.net>

SVN-Revision: 41563
---
 .../base-files/files/lib/upgrade/common.sh    | 37 +++++++++++++------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/package/base-files/files/lib/upgrade/common.sh b/package/base-files/files/lib/upgrade/common.sh
index 6f1880fba6..ba9de99dc9 100644
--- a/package/base-files/files/lib/upgrade/common.sh
+++ b/package/base-files/files/lib/upgrade/common.sh
@@ -99,6 +99,13 @@ kill_remaining() { # [ <signal> ]
 	local sig="${1:-TERM}"
 	echo -n "Sending $sig to remaining processes ... "
 
+	local my_pid=$$
+	local my_ppid=$(cut -d' ' -f4  /proc/$my_pid/stat)
+	local my_ppisupgraded=
+	grep -q upgraded /proc/$my_ppid/cmdline >/dev/null && {
+		local my_ppisupgraded=1
+	}
+	
 	local stat
 	for stat in /proc/[0-9]*/stat; do
 		[ -f "$stat" ] || continue
@@ -113,18 +120,26 @@ kill_remaining() { # [ <signal> ]
 		# Skip kernel threads
 		[ -n "$cmdline" ] || continue
 
-		case "$name" in
-			# Skip essential services
-			*procd*|*upgraded*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*) : ;;
+		if [ $$ -eq 1 ] || [ $my_ppid -eq 1 ] && [ -n "$my_ppisupgraded" ]; then
+			# Running as init process, kill everything except me
+			if [ $pid -ne $$ ] && [ $pid -ne $my_ppid ]; then
+				echo -n "$name "
+				kill -$sig $pid 2>/dev/null
+			fi
+		else 
+			case "$name" in
+				# Skip essential services
+				*procd*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*) : ;;
 
-			# Killable process
-			*)
-				if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
-					echo -n "$name "
-					kill -$sig $pid 2>/dev/null
-				fi
-			;;
-		esac
+				# Killable process
+				*)
+					if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
+						echo -n "$name "
+						kill -$sig $pid 2>/dev/null
+					fi
+				;;
+			esac
+		fi
 	done
 	echo ""
 }