[Xen-changelog] [xen-unstable] Make network-bridge fail on NFS or iscsi root.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1183324846 -3600
# Node ID ccf240f99263465115f5b02e2cbcf585e852d145
# Parent  a3a0202af8a43bed9203ca260020361435b90b63
Make network-bridge fail on NFS or iscsi root.
Since setting up bridging involves bringing down the network interface,
bridging clearly isn't compatible with the likes of NFS or iSCSI root.

Signed-off-by: Mark McLoughlin <markmc@xxxxxxxxxx>
---
 tools/examples/network-bridge |   12 ++++++++++++
 1 files changed, 12 insertions(+)

diff -r a3a0202af8a4 -r ccf240f99263 tools/examples/network-bridge
--- a/tools/examples/network-bridge     Sun Jul 01 22:18:04 2007 +0100
+++ b/tools/examples/network-bridge     Sun Jul 01 22:20:46 2007 +0100
@@ -172,9 +172,21 @@ show_status () {
     echo '============================================================'
 }
 
+is_network_root () {
+    local rootfs=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $3; }}' 
/etc/mtab)
+    local rootopts=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $4; }}' 
/etc/mtab)
+
+    [[ "$rootfs" =~ "^nfs" ]] || [[ "$rootopts" =~ "_netdev" ]] && return 0 || 
return 1
+}
+
 op_start () {
     if [ "${bridge}" = "null" ] ; then
        return
+    fi
+
+    if is_network_root ; then
+        [ -x /usr/bin/logger ] && /usr/bin/logger "network-bridge: bridging 
not supported on network root; not starting"
+        return
     fi
 
     if link_exists "$pdev"; then

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