From 5f6b68ac91103cd66ff79dc65b35ac0f613e4957 Mon Sep 17 00:00:00 2001
From: Harald Hoyer <harald@redhat.com>
Date: Fri, 24 Oct 2014 15:47:24 +0200
Subject: [PATCH] ifcfg/write-ifcfg: only write DEVICE for non-kernel names

Rename an interface to the kernel namespace is not allowed, so don't add
DEVICE="<iface>", if HWADDR is given.

(cherry picked from commit 3947f07d93cde5e1cf0d788537e93b135d6c27b0)
---
 modules.d/40network/net-lib.sh   | 46 ++++++++++++++++++++++++++++++-
 modules.d/45ifcfg/write-ifcfg.sh | 59 ++++++++++++++++++++++++++--------------
 2 files changed, 84 insertions(+), 21 deletions(-)

diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
index d178353..c39889a 100755
--- a/modules.d/40network/net-lib.sh
+++ b/modules.d/40network/net-lib.sh
@@ -560,7 +560,19 @@ find_iface_with_link() {
 }
 
 is_persistent_ethernet_name() {
-    case "$1" in
+    local _netif="$1"
+    local _name_assign_type="0"
+
+    [ -f "/sys/class/net/$_netif/name_assign_type" ] \
+        && _name_assign_type=$(cat "/sys/class/net/$_netif/name_assign_type")
+
+    # NET_NAME_ENUM 1
+    [ "$_name_assign_type" = "1" ] && return 1
+
+    # NET_NAME_PREDICTABLE 2
+    [ "$_name_assign_type" = "2" ] && return 0
+
+    case "$_netif" in
         # udev persistent interface names
         eno[0-9]|eno[0-9][0-9]|eno[0-9][0-9][0-9]*)
             ;;
@@ -580,3 +592,35 @@ is_persistent_ethernet_name() {
     esac
     return 0
 }
+
+is_kernel_ethernet_name() {
+    local _netif="$1"
+    local _name_assign_type="1"
+
+    if [ -e "/sys/class/net/$_netif/name_assign_type" ]; then
+        _name_assign_type=$(cat "/sys/class/net/$_netif/name_assign_type")
+
+        case "$_name_assign_type" in
+            2|3|4)
+                # NET_NAME_PREDICTABLE 2
+                # NET_NAME_USER 3
+                # NET_NAME_RENAMED 4
+                return 1
+                ;;
+            1|*)
+                # NET_NAME_ENUM 1
+                return 0
+                ;;
+        esac
+    fi
+
+    # fallback to error prone manual name check
+    case "$_netif" in
+        eth[0-9]|eth[0-9][0-9]|eth[0-9][0-9][0-9]*)
+            return 0
+            ;;
+        *)
+            return 1
+    esac
+
+}
diff --git a/modules.d/45ifcfg/write-ifcfg.sh b/modules.d/45ifcfg/write-ifcfg.sh
index 0395e05..ef35a76 100755
--- a/modules.d/45ifcfg/write-ifcfg.sh
+++ b/modules.d/45ifcfg/write-ifcfg.sh
@@ -82,18 +82,41 @@ print_s390() {
     return 0
 }
 
+hw_bind() {
+    local _netif="$1"
+    local _macaddr="$2"
+
+    [ -n "$_macaddr" ] \
+        && echo "MACADDR=\"$_macaddr\""
+
+    print_s390 "$_netif" \
+        && return 0
+
+    [ -n "$_macaddr" ] && return 0
+
+    is_persistent_ethernet_name "$_netif" && return 0
+
+    [ -f "/sys/class/net/$_netif/addr_assign_type" ] \
+        && [ "$(cat "/sys/class/net/$_netif/addr_assign_type")" != "0" ] \
+        && return 1
+
+    [ -f "/sys/class/net/$_netif/address" ] \
+        || return 1
+
+    echo "HWADDR=\"$(cat /sys/class/net/$_netif/address)\""
+}
+
 interface_bind() {
-    local netif="$1"
-    local macaddr="$2"
-    if ! print_s390 $netif; then
-        if [ -z "$macaddr" ] && \
-            ! is_persistent_ethernet_name "$netif" && \
-            [ -f /sys/class/net/$netif/addr_assign_type ] && \
-            [ "$(cat /sys/class/net/$netif/addr_assign_type)" = "0" ] && \
-            [ -f /sys/class/net/$netif/address ]; then
-            echo "HWADDR=\"$(cat /sys/class/net/$netif/address)\""
-        fi
+    local _netif="$1"
+    local _macaddr="$2"
+
+    # see, if we can bind it to some hw parms
+    if hw_bind "$_netif" "$_macaddr"; then
+        # only print out DEVICE, if it's user assigned
+        is_kernel_ethernet_name "$_netif" && return 0
     fi
+
+    echo "DEVICE=\"$_netif\""
 }
 
 for netup in /tmp/net.*.did-setup ; do
@@ -131,7 +154,8 @@ for netup in /tmp/net.*.did-setup ; do
 
     {
         echo "# Generated by dracut initrd"
-        echo "DEVICE=\"$netif\""
+        echo "NAME=\"$netif\""
+        interface_bind "$netif" "$macaddr"
         echo "ONBOOT=yes"
         echo "NETBOOT=yes"
         echo "UUID=\"$uuid\""
@@ -177,10 +201,7 @@ for netup in /tmp/net.*.did-setup ; do
     if [ -z "$bridge" ] && [ -z "$bond" ] && [ -z "$vlan" ]; then
         # standard interface
         {
-            [ -n "$macaddr" ] && echo "MACADDR=\"$macaddr\""
-            interface_bind "$netif" "$macaddr"
             echo "TYPE=Ethernet"
-            echo "NAME=\"$netif\""
             [ -n "$mtu" ] && echo "MTU=\"$mtu\""
         } >> /tmp/ifcfg/ifcfg-$netif
     fi
@@ -207,16 +228,15 @@ for netup in /tmp/net.*.did-setup ; do
             # write separate ifcfg file for the raw eth interface
             (
                 echo "# Generated by dracut initrd"
-                echo "DEVICE=\"$slave\""
+                echo "NAME=\"$slave\""
                 echo "TYPE=Ethernet"
                 echo "ONBOOT=yes"
                 echo "NETBOOT=yes"
                 echo "SLAVE=yes"
                 echo "MASTER=\"$netif\""
-                echo "NAME=\"$slave\""
                 echo "UUID=\"$(cat /proc/sys/kernel/random/uuid)\""
+                unset macaddr
                 [ -e /tmp/net.$slave.override ] && . /tmp/net.$slave.override
-                [ -n "$macaddr" ] && echo "MACADDR=\"$macaddr\""
                 interface_bind "$slave" "$macaddr"
             ) >> /tmp/ifcfg/ifcfg-$slave
         done
@@ -232,15 +252,14 @@ for netup in /tmp/net.*.did-setup ; do
             # write separate ifcfg file for the raw eth interface
             (
                 echo "# Generated by dracut initrd"
-                echo "DEVICE=\"$slave\""
+                echo "NAME=\"$slave\""
                 echo "TYPE=Ethernet"
                 echo "ONBOOT=yes"
                 echo "NETBOOT=yes"
                 echo "BRIDGE=\"$bridgename\""
-                echo "NAME=\"$slave\""
                 echo "UUID=\"$(cat /proc/sys/kernel/random/uuid)\""
+                unset macaddr
                 [ -e /tmp/net.$slave.override ] && . /tmp/net.$slave.override
-                [ -n "$macaddr" ] && echo "MACADDR=\"$macaddr\""
                 interface_bind "$slave" "$macaddr"
             ) >> /tmp/ifcfg/ifcfg-$slave
         done