1From 1fa4d0eb9631771bd751f04ce898433580996e5e Mon Sep 17 00:00:00 2001
2From: Chen Qi <Qi.Chen@windriver.com>
3Date: Thu, 27 Mar 2014 02:34:41 +0000
4Subject: [PATCH] init.d: add support for read-only rootfs
5
6Upstream-Status: Inappropriate [oe specific]
7
8Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
9---
10 init.d | 40 ++++++++++++++++++++++++++++++++++++++++
11 1 file changed, 40 insertions(+)
12
13diff --git a/init.d b/init.d
14index 2ef2277..95e8909 100644
15--- a/init.d
16+++ b/init.d
17@@ -6,8 +6,48 @@ PATH=/sbin:/bin:/usr/sbin:/usr/bin
18 # Don't modify this line, change or create /etc/default/bind9.
19 OPTIONS=""
20
21+test -f /etc/default/rcS && . /etc/default/rcS
22 test -f /etc/default/bind9 && . /etc/default/bind9
23
24+# This function is here because it's possible that /var and / are on different partitions.
25+is_on_read_only_partition () {
26+    DIRECTORY=$1
27+    dir=`readlink -f $DIRECTORY`
28+    while true; do
29+	if [ ! -d "$dir" ]; then
30+	    echo "ERROR: $dir is not a directory"
31+	    exit 1
32+	else
33+	    for flag in `awk -v dir=$dir '{ if ($2 == dir) { print "FOUND"; split($4,FLAGS,",") } }; \
34+		END { for (f in FLAGS) print FLAGS[f] }' < /proc/mounts`; do
35+		[ "$flag" = "FOUND" ] && partition="read-write"
36+		[ "$flag" = "ro" ] && { partition="read-only"; break; }
37+	    done
38+	    if [ "$dir" = "/" -o -n "$partition" ]; then
39+		break
40+	    else
41+		dir=`dirname $dir`
42+	    fi
43+	fi
44+    done
45+    [ "$partition" = "read-only" ] && echo "yes" || echo "no"
46+}
47+
48+bind_mount () {
49+    olddir=$1
50+    newdir=$2
51+    mkdir -p $olddir
52+    cp -a $newdir/* $olddir
53+    mount --bind $olddir $newdir
54+}
55+
56+# Deal with read-only rootfs
57+if [ "$ROOTFS_READ_ONLY" = "yes" ]; then
58+    [ "$VERBOSE" != "no" ] && echo "WARN: start bind service in read-only rootfs"
59+    [ `is_on_read_only_partition /etc/bind` = "yes" ] && bind_mount /var/volatile/bind/etc /etc/bind
60+    [ `is_on_read_only_partition /var/named` = "yes" ] && bind_mount /var/volatile/bind/named /var/named
61+fi
62+
63 test -x /usr/sbin/rndc || exit 0
64
65 case "$1" in
66