From 7b6180eee2d9428de12ce1453c32a00d79449026 Mon Sep 17 00:00:00 2001
From: Eric Hameleers <alien@slackware.com>
Date: Thu, 5 May 2016 16:01:17 +0200
Subject: liveinit: when network-booting, add MAC address as suffix to the
 hostname.

This default behaviour can be prohibited by applying an extended 'hostname'
boot parameter as follows:

hostname=your_custom_hostname,fixed

The qualifier 'fixed' after the comma will prevent the hostname from being
changed to something else than 'your_custom_hostname'.
---
 liveinit | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'liveinit')

diff --git a/liveinit b/liveinit
index 5211629..0ee0b85 100755
--- a/liveinit
+++ b/liveinit
@@ -72,6 +72,8 @@ BLACKLIST=""
 GLAMORACCEL=1
 
 # NFS root support:
+HNMAC=""
+HNMAC_ALLOWED="YES"
 INTERFACE=""
 NFSHOST=""
 
@@ -116,7 +118,12 @@ for ARG in $(cat /proc/cmdline); do
       DHCPWAIT=$(echo $ARG | cut -f2 -d=)
     ;;
     hostname=*)
-      LIVE_HOSTNAME=$(echo $ARG | cut -f2 -d=)
+      # generic syntax: hostname=newname[,qualifier]
+      LIVE_HOSTNAME=$(echo $ARG | cut -f2 -d= | cut -f1 -d,)
+      if [ "$(echo $ARG | cut -f2 -d= | cut -f2 -d,)" = "fixed" ]; then
+        Keep hostname fixed i.e. never add a MAC address suffix:
+        HNMAC_ALLOWED="NO"
+      fi
     ;;
     init=*)
       INIT=$(echo $ARG | cut -f2 -d=)
@@ -411,6 +418,9 @@ if [ "$RESCUE" = "" ]; then
       fi
     fi
 
+    # Store the interface MAC address so we may modify the hostname with it:
+    HNMAC=$(ip link show ${INTERFACE} |grep link/ether |tr -s ' ' |cut -d ' ' -f3 |tr -d ':')
+
   } # End setnet()
 
   find_loop() {
@@ -842,6 +852,15 @@ root:${ROOTPW}
 EOPW
   fi
 
+  if [ ! -z "$HNMAC" -a "$HNMAC_ALLOWED" = "YES" ]; then
+    # We are booting from the network, give it a unique hostname:
+    if [ -z "$LIVE_HOSTNAME" ]; then
+      LIVE_HOSTNAME="@DARKSTAR@-${HNMAC}"
+    else
+      LIVE_HOSTNAME="${LIVE_HOSTNAME}-${HNMAC}"
+    fi
+  fi
+
   if [ ! -z "$LIVE_HOSTNAME" ]; then
     # User entered a custom hostname on the boot commandline:
     echo "${MARKER}:  Changing hostname to '$LIVE_HOSTNAME'."
-- 
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