network: support multiple bonding interfaces

Currently dracut only support 1 bond, namyly bond0 by default. However multiple
bonds configuration may be needed. For example in kdump, in 1st kernel, more
than one bonds may be configured, and bondX other than bond0 is used as output
interface to remote host which will store dump core. This patch can solve this
problem, to write real bond information to initramfs, 2nd kdump kernel will
use it to create the relevant bondX interface.

Tested-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Baoquan He <bhe@redhat.com>

modules.d/40network/ifup.sh

@@ -21,14 +21,18 @@ use_bridge='false'
 use_vlan='false'
 
 # enslave this interface to bond?
-if [ -e /tmp/bond.info ]; then
+for i in /tmp/bond.*.info; do
-    . /tmp/bond.info
+    [ -e "$i" ] || continue
+    unset bondslaves
+    unset bondname
+    . "$i"
     for slave in $bondslaves ; do
         if [ "$netif" = "$slave" ] ; then
             netif=$bondname
+            break 2
         fi
     done
-fi
+done
 
 if [ -e /tmp/team.info ]; then
     . /tmp/team.info
@@ -138,11 +142,12 @@ if [ "$netif" = "lo" ] ; then
 fi
 
 # start bond if needed
-if [ -e /tmp/bond.info ]; then
+if [ -e /tmp/bond.${netif}.info ]; then
-    . /tmp/bond.info
+    . /tmp/bond.${netif}.info
 
     if [ "$netif" = "$bondname" ] && [ ! -e /tmp/net.$bondname.up ] ; then # We are master bond device
         modprobe bonding
+        echo "+$netif" >  /sys/class/net/bonding_masters
         ip link set $netif down
 
         # Stolen from ifup-eth

modules.d/40network/net-genrules.sh

@@ -28,11 +28,14 @@ fi
     fi
 
     # bond: attempt only the defined interface (override bridge defines)
-    if [ -e /tmp/bond.info ]; then
+    for i in /tmp/bond.*.info; do
-        . /tmp/bond.info
+        [ -e "$i" ] || continue
+        unset bondslaves
+        unset bondname
+        . "$i"
         # It is enough to fire up only one
         IFACES="$IFACES ${bondslaves%% *}"
-    fi
+    done
 
     if [ -e /tmp/team.info ]; then
         . /tmp/team.info

modules.d/40network/parse-bond.sh

@@ -54,8 +54,8 @@ if getarg bond >/dev/null; then
     fi
     # Make it suitable for initscripts export
     bondoptions=$(str_replace "$bondoptions" ";" ",")
-    echo "bondname=$bondname" > /tmp/bond.info
+    echo "bondname=$bondname" > /tmp/bond.${bondname}.info
-    echo "bondslaves=\"$bondslaves\"" >> /tmp/bond.info
+    echo "bondslaves=\"$bondslaves\"" >> /tmp/bond.${bondname}.info
-    echo "bondoptions=\"$bondoptions\"" >> /tmp/bond.info
+    echo "bondoptions=\"$bondoptions\"" >> /tmp/bond.${bondname}.info
     return
 fi

modules.d/40network/parse-bridge.sh

@@ -37,12 +37,6 @@ parsebridge() {
 unset bridgename ethnames
 
 iface=eth0
-if [ -e /tmp/bond.info ]; then
-    . /tmp/bond.info
-    if [ -n "$bondname" ] ; then
-        iface=$bondname
-    fi
-fi
 
 # Parse bridge for bridgename and ethnames
 if bridge="$(getarg bridge)"; then

modules.d/45ifcfg/write-ifcfg.sh

@@ -9,10 +9,6 @@ udevadm settle --timeout=30
 
 read IFACES < /tmp/net.ifaces
 
-if [ -e /tmp/bond.info ]; then
-    . /tmp/bond.info
-fi
-
 if [ -e /tmp/bridge.info ]; then
     . /tmp/bridge.info
 fi
@@ -89,6 +85,11 @@ for netif in $IFACES ; do
     # bridge?
     unset bridge
     unset bond
+    unset bondslaves
+    unset bondname
+    unset bondoptions
+    [ -e /tmp/bond.${netif}.info ] && . /tmp/bond.${netif}.info
+
     uuid=$(cat /proc/sys/kernel/random/uuid)
     if [ "$netif" = "$bridgename" ]; then
         bridge=yes