[kexec-tools] network dns config fix

[Dave Young]

commit 57f8e18d1700f63b1f0e068d0fe75fa120609be4
Author: Dave Young <dyoung at redhat.com>
Date:   Thu Jul 12 11:15:35 2012 +0800

    network dns config fix
    
    In case explict DNS setup in ifcfg file, we should add proper cmdline
    for dracut network use.
    
    Add a kdump_setup_dns function to handle this.
    v1->v2: vivek: use echo instead of 'echo -n'
    
    Signed-off-by: Dave Young <dyoung at redhat.com>
    Acked-by: Vivek Goyal <vgoyal at redhat.com>

 dracut-module-setup.sh |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index c1c6929..8dfe207 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -43,6 +43,14 @@ kdump_is_vlan() {
      [ -f /proc/net/vlan/"$1" ]
 }
 
+# $1: netdev name
+kdump_setup_dns() {
+    _dnsfile=${initdir}/etc/cmdline.d/42dns.conf
+    . /etc/sysconfig/network-scripts/ifcfg-$1
+    [ -n "$DNS1" ] && echo "nameserver=$DNS1" > "$_dnsfile"
+    [ -n "$DNS2" ] && echo "nameserver=$DNS2" >> "$_dnsfile"
+}
+
 #$1: netdev name
 #checking /etc/sysconfig/network-scripts/ifcfg-$1,
 #if it use static ip echo it, or echo null
@@ -142,6 +150,8 @@ kdump_setup_netdev() {
         echo -n " ip=${_static}$_netdev:${_proto}" > ${initdir}/etc/cmdline.d/40ip.conf
         echo " ifname=$_netdev:$(kdump_get_mac_addr $_netdev)" >> ${initdir}/etc/cmdline.d/40ip.conf
     fi
+
+    kdump_setup_dns "$_netdev"
 }
 
 #Function:kdump_install_net