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+#!/bin/sh
+#The files in this directory (except pbuilderrc) were written by
+#(C) 2006 Kapil Hari Paranjape <kapil@imsc.res.in>. 
+#They are placed in the public domain. You can do with them exactly as you wish.
+
+# This assumes:
+# A.
+#	You have added the following lines to you ~/.pbuilderrc
+#		BASEDEV=<path to your base device>
+#		COWDEV=<path to your cow device>
+#
+# B.
+#        That the BASE and COW device have been properly set up.
+#        Specifically, you must run:
+#		e2fsck -f $BASEDEV
+#	 It is too painful to run this everytime!
+#
+#	 You can also run
+#		blockdev --setro $BASEDEV
+#	 This tries to ensure that the $BASDEV remains pristine.
+#
+# C.
+#	 It also assumes that /dev/mapper/{total,work}
+#	 do not exist already.
+
+
+if [ $# -lt 1 ]
+then
+	echo You need to supply the name of the dsc file
+	exit 1
+fi
+
+PKGDSC=$1
+
+# Source the pbuilderrc file
+. /usr/lib/pbuilder/pbuilder-loadconfig
+
+
+if [ -z "$BASEDEV" -o -z "$COWDEV" ]
+then
+	echo Please define BASEDEV and COWDEV in your ~/.pbuilderrc file
+	exit 1
+fi
+
+# Size computations
+
+BASESIZE=$(blockdev --getsize $BASEDEV)
+COWSIZE=$(blockdev --getsize $COWDEV)
+TOTAL=$[ $COWSIZE + $BASESIZE ]
+
+## Create the total base device
+# It consists of the base device extended by zeroes.
+# The length of the zeroes is the size of the cow.
+dd if=/dev/zero of=$COWDEV bs=4K count=16
+
+( echo 0 $BASESIZE linear $BASEDEV 0 ; \
+  echo $BASESIZE $COWSIZE zero ) | \
+  dmsetup create total 
+
+## Create the work device
+# It is the snapshot device with the all writes
+# going to the cow device. The file-system is resized
+# to the maximum extent possible.
+echo 0 $TOTAL snapshot /dev/mapper/total $COWDEV p 16 | \
+  dmsetup create work
+
+resize2fs /dev/mapper/work 
+
+mount /dev/mapper/work $BUILDPLACE
+
+# run build
+pbuilder build --no-targz $PKGDSC 
+
+## Check the status
+# If pbuilder returned with
+# an error then we must stop
+# and be able to examine the work space.
+[ $? != 0 ] && \
+( echo Error during build. $BUILDPLACE contains the build place. ; \
+  exit 1 )
+
+## Clean Up
+umount $BUILDPLACE
+dmsetup remove work
+dmsetup remove total
+
+echo Done.
+