[PATCH] dracut-module-setup: Make kdump shell honour and check for PEERDNS

[Minfei Huang]

Resolves: rhbz805307

It is useless to configurate the /etc/dhclient.conf to valid in the
second kernel, when get network config by dhcp. Using the following
dhclient configuration, the kernel will not override the
configuration getting from the dhcp server in the file /etc/resolv.conf.

supersede domain-name "machine.test.group";
supersede domain-name-servers 10.125.97.171, 10.126.98.43, 10.125.97.176;

According to the condition, we should determine to modify the
/etc/dhclient.conf or not. If set the PEERDNS="no" in the configuration of
/etc/sysconfig/network-scripts/ifcfg-$net_dev, the dhclient configuration
will override the search domain and dns servers received from dhcp server.

Signed-off-by: Minfei Huang <mhuang at redhat.com>
---
 dracut-module-setup.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 02a0557..008e560 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -66,6 +66,16 @@ kdump_setup_dns() {
     [ -n "$DNS2" ] && echo "nameserver=$DNS2" >> "$_dnsfile"
 }
 
+kdump_setup_dhclient() {
+    _dhclient_file="/etc/dhclient.conf"
+    [ ! -e $_dhclient_file ] && return
+
+    . /etc/sysconfig/network-scripts/ifcfg-$1
+    if [ "x""$PEERDNS" = "xno" ] || [ "x""$PEERDNS" = "xNO" ]; then
+        cat $_dhclient_file | grep ^supersede >> ${initdir}/$_dhclient_file
+    fi
+}
+
 #$1: netdev name
 #$2: srcaddr
 #if it use static ip echo it, or echo null
@@ -252,6 +262,8 @@ kdump_setup_netdev() {
     fi
 
     kdump_setup_dns "$_netdev"
+
+    kdump_setup_dhclient "$_netdev"
 }
 
 #Function:kdump_install_net
-- 
1.8.3.1