Add a dhcphostname option to grml which will set the hostname of the
booted system according to the dns information.

This Patch implements support for the non-netboot cases by adding
an appropriate script to be called by pump.

diffstat dhcphostname-pump.patch 
 autoconfig.functions |    2 +-
 etc/grml/pump-script |   22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

signed-off-by: Andreas Thienemann <andreas@bawue.net>

diff --git a/autoconfig.functions b/autoconfig.functions
index c1bc848..6bc1d5a 100755
--- a/autoconfig.functions
+++ b/autoconfig.functions
@@ -1264,7 +1264,7 @@ else
     einfo "Network device ${WHITE}${DEVICE}${NORMAL} detected, DHCP broadcasting for IP. (Backgrounding)"
     trap 2 3 11
     ifconfig $DEVICE up >>$DEBUG 2>&1
-    ( pump -i $DEVICE >>$DEBUG 2>&1 && echo finished_running_pump > /etc/network/status/$DEVICE ) &
+    ( pump -i $DEVICE --script=/etc/grml/pump-script >>$DEBUG 2>&1 && echo finished_running_pump > /etc/network/status/$DEVICE ) &
     trap "" 2 3 11
     sleep 1
     eend 0
diff --git a/etc/grml/pump-script b/etc/grml/pump-script
new file mode 100644
index 0000000..2d0ef13
--- /dev/null
+++ b/etc/grml/pump-script
@@ -0,0 +1,22 @@
+#!/bin/sh
+# PUMP Script
+# $1 Calling circumstance (up, renewal, down)
+# $2 interface
+# $3 ip
+
+# Exit early, if we're not being called for the initial lease
+[ "$1" != "up" ] && exit 0
+
+# See if we're needed at all, only run when booted with dhcphostname
+for i in $(cat /proc/cmdline)
+do
+	if [ "$i" = "dhcphostname" ]
+	then
+		# dhcphostname is set, get the PTR for the ip
+		hostname=$(host $3 | awk '{ print substr($5, 0, length($5)-1) }')
+		if [ -n "$hostname" ]
+		then
+			echo $hostname > /etc/hostname
+		fi
+	fi
+done