dpkg: restore dpkg support

Reverse changes in commit 7d1591a that broke support for
dpkg (specifically dpkg-buildpackage couldn't run as debian/control was
not automatically generated).

Makefile.am

@@ -5,6 +5,14 @@ ACLOCAL_AMFLAGS = -I m4
 #SUBDIRS = datapath
 SUBDIRS =
 
+if HAVE_DPKG_BUILDPACKAGE
+distcheck-hook:
+	cd $(srcdir) && dpkg-buildpackage -rfakeroot -us -uc
+	cd $(srcdir) && fakeroot ./debian/rules clean
+else
+distcheck-hook:
+endif
+
 AM_CPPFLAGS = $(SSL_CFLAGS)
 AM_CPPFLAGS += -I $(top_srcdir)/include
 AM_CPPFLAGS += -I $(top_srcdir)/lib
@@ -56,3 +64,4 @@ include udatapath/automake.mk
 include tests/automake.mk
 include include/automake.mk
 include third-party/automake.mk
+include debian/automake.mk

acinclude.m4

@@ -180,6 +180,13 @@ AC_DEFUN([OFP_CHECK_IF_PACKET],
                 [Define to 1 if net/if_packet.h is available.])
    fi])
 
+dnl Checks for dpkg-buildpackage.  If this is available then we check
+dnl that the Debian packaging is functional at "make distcheck" time.
+AC_DEFUN([OFP_CHECK_DPKG_BUILDPACKAGE],
+  [AC_CHECK_PROG([HAVE_DPKG_BUILDPACKAGE], [dpkg-buildpackage], [yes], [no])
+   AM_CONDITIONAL([HAVE_DPKG_BUILDPACKAGE],
+                  [test $HAVE_DPKG_BUILDPACKAGE = yes])])
+
 dnl ----------------------------------------------------------------------
 dnl These macros are from GNU PSPP, with the following original license:
 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.

boot.sh

@@ -1,3 +1,14 @@
 #! /bin/sh
 
+set -e
+
+# Generate list of files in debian/ to distribute.
+(echo '# Automatically generated by boot.sh (from Git tree).' &&
+ printf 'EXTRA_DIST += \\\n' &&
+ git ls-files debian | grep -v '^debian/\.gitignore$' |
+ sed -e 's/\(.*\)/	\1 \\/' -e '$s/ \\//') > debian/automake.mk
+
+cat debian/control.in > debian/control
+
+# Bootstrap configure system from .ac/.am files
 autoreconf --install --force

configure.ac

@@ -62,6 +62,8 @@ AC_ARG_VAR(KARCH, [Kernel Architecture String])
 AC_SUBST(KARCH)
 #OFP_CHECK_LINUX(l26, 2.6, KBLD26, KSRC26, L26_ENABLED)
 
+OFP_CHECK_DPKG_BUILDPACKAGE
+
 OFP_ENABLE_OPTION([-Wall])
 OFP_ENABLE_OPTION([-Wno-sign-compare])
 OFP_ENABLE_OPTION([-Wpointer-arith])