Add config parameter to disable linux-headers-all packages

The linux-grsec source package needs a way to explicitly disable these
binary packages which are already built by the linux source package.
We already do that when there are no actual kernels for the target
architecture.  Rename the FOREIGN_KERNEL make variable and combine the
two conditions.

Based on work by Yves-Alexis Perez.

debian/bin/gencontrol.py

@@ -44,6 +44,7 @@ class Gencontrol(Base):
         },
         'packages': {
             'docs': config.SchemaItemBoolean(),
+            'headers-all': config.SchemaItemBoolean(),
             'installer': config.SchemaItemBoolean(),
             'libc-dev': config.SchemaItemBoolean(),
 
@@ -134,10 +135,6 @@ class Gencontrol(Base):
         self._setup_makeflags(self.arch_makeflags, makeflags, config_base)
 
     def do_arch_packages(self, packages, makefile, arch, vars, makeflags, extra):
-        # Some userland architectures require kernels from another
-        # (Debian) architecture, e.g. x32/amd64.
-        foreign_kernel = not self.config['base', arch].get('featuresets')
-
         if self.version.linux_modifier is None:
             try:
                 abiname_part = '-%s' % self.config['abi', arch]['abiname']
@@ -146,14 +143,19 @@ class Gencontrol(Base):
             makeflags['ABINAME'] = vars['abiname'] = \
                 self.abiname_version + abiname_part
 
-        if foreign_kernel:
-            packages_headers_arch = []
-            makeflags['FOREIGN_KERNEL'] = True
-        else:
+        # Some userland architectures require kernels from another
+        # (Debian) architecture, e.g. x32/amd64.
+        # And some derivatives don't need the headers-all packages
+        # for other reasons.
+        if (self.config['base', arch].get('featuresets') and
+            self.config.merge('packages').get('headers-all', True)):
             headers_arch = self.templates["control.headers.arch"]
             packages_headers_arch = self.process_packages(headers_arch, vars)
             packages_headers_arch[-1]['Depends'].extend(PackageRelation())
             extra['headers_arch_depends'] = packages_headers_arch[-1]['Depends']
+        else:
+            packages_headers_arch = []
+            makeflags['DO_HEADERS_ALL'] = False
 
         if self.config.merge('packages').get('libc-dev', True):
             libc_dev = self.templates["control.libc-dev"]
@@ -364,7 +366,8 @@ class Gencontrol(Base):
             package_headers = self.process_package(headers[0], vars)
             package_headers['Depends'].extend(relations_compiler_headers)
             packages_own.append(package_headers)
-            extra['headers_arch_depends'].append('%s (= ${binary:Version})' % packages_own[-1]['Package'])
+            if extra.get('headers_arch_depends'):
+                extra['headers_arch_depends'].append('%s (= ${binary:Version})' % packages_own[-1]['Package'])
 
         build_debug = config_entry_build.get('debug-info')
 

debian/rules.real

@@ -50,7 +50,8 @@ MAKEOVERRIDES =
 #
 # Targets
 #
-ifneq ($(FOREIGN_KERNEL),True)
+binary-arch-arch:
+ifneq ($(DO_HEADERS_ALL),False)
   binary-arch-arch: install-headers_$(ARCH)
 endif
 ifneq ($(DO_LIBC),False)