network: add rd.bootif=0 to ignore BOOTIF

https://bugzilla.redhat.com/show_bug.cgi?id=1044623

dracut.cmdline.7.asc

@@ -484,6 +484,12 @@ interface name. Better name it "bootnet" or "bluesocket".
     specify network interface to use routing and netroot information from.
     Required if multiple ip= lines are used.
 
+**BOOTIF=**__<MAC>__::
+    specify network interface to use routing and netroot information from.
+
+**rd.bootif=0**::
+    Disable BOOTIF parsing, which is provided by PXE
+
 **nameserver=**__<IP>__ [**nameserver=**__<IP>__ ...]::
     specify nameserver(s) to use
 

modules.d/40network/parse-ip-opts.sh

@@ -108,7 +108,7 @@ for p in $(getargs ip=); do
 done
 
 # put BOOTIF in IFACES to make sure it comes up
-if BOOTIF="$(getarg BOOTIF=)"; then
+if getargbool 1 "rd.bootif" && BOOTIF="$(getarg BOOTIF=)"; then
     BOOTDEV=$(fix_bootif $BOOTIF)
     IFACES="$BOOTDEV $IFACES"
 fi