From 0126e7505eade8497c8fff9efc302b875450b081 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 10 Jul 2014 19:16:27 +0000
Subject: sysupgrade: Enable killing of all processes under upgraded
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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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41563 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 package/base-files/files/lib/upgrade/common.sh | 39 ++++++++++++++++++--------
 1 file changed, 27 insertions(+), 12 deletions(-)

(limited to 'package')

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*) : ;;
-
-			# Killable process
-			*)
-				if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
-					echo -n "$name "
-					kill -$sig $pid 2>/dev/null
-				fi
-			;;
-		esac
+		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
+		fi
 	done
 	echo ""
 }
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