UBUNTU: [Debian] generate a SRCPKGNAME-udebs-FLAVOUR-di depending on all built udebs

Build a nice little meta package for use in the seeds.
Signed-off-by: Andy Whitcroft <apw@canonical.com>

debian/rules.d/5-udebs.mk

@@ -42,3 +42,26 @@ do-binary-udebs: debian/control
 	  $(lockme) dh_gencontrol -p$$i; \
 	  dh_builddeb -p$$i; \
 	done
+	
+	# Generate the meta-udeb dependancy lists.
+	awk '								\
+		/Package: /		{ package=$$2 }			\
+		(/Package-Type: udeb/ && package !~ /^'$(src_pkg_name)'-udebs-/) { 	\
+			n = split(package, bits, "-");			\
+			flavour = bits[n - 1];				\
+			udebs[flavour] = udebs[flavour] package ", ";	\
+		}							\
+		END {							\
+			for (flavour in udebs) {				\
+				package="'$(src_pkg_name)'-udebs-" flavour;	\
+				file="debian/" package ".substvars";		\
+				print("udeb:Depends=" udebs[flavour]) > file;	\
+				metas="'$(builddir)'/udeb-meta-packages";	\
+				print(package) >metas			\
+			}						\
+		}							\
+	' <$(CURDIR)/debian/control
+	while read i; do \
+		$(lockme) dh_gencontrol -p$$i; \
+		dh_builddeb -p$$i; \
+	done <$(builddir)/udeb-meta-packages