[PATCH 2/2] network/net-lib.sh: delete duplicated DNS items from "/etc/resolv.conf"

[Xunlei Pang <xlpang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

Users can pass the DNS information throught "nameserver=" cmdline,
there maybe duplicated inputs.

"/etc/resolv.conf" have some restrictions on the number of DNS items
effective, so make sure that this file contains no duplicated items.

We achieve this by simply making the file have no duplicated lines.

Signed-off-by: Xunlei Pang <xlpang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 modules.d/40network/module-setup.sh | 2 +-
 modules.d/40network/net-lib.sh      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules.d/40network/module-setup.sh b/modules.d/40network/module-setup.sh
index 4bf93cc..53b4b60 100755
--- a/modules.d/40network/module-setup.sh
+++ b/modules.d/40network/module-setup.sh
@@ -23,7 +23,7 @@ installkernel() {
 # called by dracut
 install() {
     local _arch _i _dir
-    inst_multiple ip arping dhclient sed
+    inst_multiple ip arping dhclient sed awk
     inst_multiple -o ping ping6
     inst_multiple -o brctl
     inst_multiple -o teamd teamdctl teamnl
diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
index 31f1a56..005ad1b 100755
--- a/modules.d/40network/net-lib.sh
+++ b/modules.d/40network/net-lib.sh
@@ -120,7 +120,7 @@ setup_net() {
     [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts
     # set up resolv.conf
     [ -e /tmp/net.$netif.resolv.conf ] && \
-        cp -f /tmp/net.$netif.resolv.conf /etc/resolv.conf
+        awk '!array[$0]++' /tmp/net.$netif.resolv.conf > /etc/resolv.conf
     [ -e /tmp/net.$netif.gw ]            && . /tmp/net.$netif.gw
 
     # add static route
-- 
1.8.3.1