generate-manifest-2.7.py: add logic to generate native manifest

python-native supposes to RPROVIDE all native packages as added in
generate-manifest-2.7.py, but it does not so far, this leads a problem
that sometimes bitbake cant find a runtime provider for a python-*-native
when a new runtime dependency on it being required, this usualy happens
after a new native python-* recipe is created or the old native python-*
recipes are upgraded.

To give a example, the following commit is trying to address such a issue:
commit 4583cd1bb15306e8f0ab7bcd80732e6f35aa4533:
[ python-native: Make python-native also RPROVIDE python-unittest-native ]

To avoid manually extending RPROVIDE every time when a new runtime
dependency is introduced, an argument '-n/--native' is added to the
manifest generator, allowing it create a native python manifest, with a
RPROVIDE line only, the RPROVIDE should contain all the sub-packages.

The generated python-native-2.7-manifest.inc is also added which is
included by python-native recipe.

(From OE-Core rev: 0cb15d9559e34faffea1ac0be825d0602f225ba9)

Signed-off-by: Ming Liu <peter.x.liu@external.atlascopco.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/contrib/python/generate-manifest-2.7.py

@@ -9,10 +9,14 @@
 #  * Updated to no longer generate special -dbg package, instead use the
 #    single system -dbg
 #  * Update version with ".1" to indicate this change
+#
+# February 26, 2017 -- Ming Liu <peter.x.liu@external.atlascopco.com>
+#  * Updated to support generating manifest for native python
 
 import os
 import sys
 import time
+import argparse
 
 VERSION = "2.7.2"
 
@@ -21,16 +25,17 @@ __version__ = "20110222.2"
 
 class MakefileMaker:
 
-    def __init__( self, outfile ):
+    def __init__( self, outfile, isNative ):
         """initialize"""
         self.packages = {}
         self.targetPrefix = "${libdir}/python%s/" % VERSION[:3]
+        self.isNative = isNative
         self.output = outfile
         self.out( """
 # WARNING: This file is AUTO GENERATED: Manual edits will be lost next time I regenerate the file.
-# Generator: '%s' Version %s (C) 2002-2010 Michael 'Mickey' Lauer <mlauer@vanille-media.de>
+# Generator: '%s%s' Version %s (C) 2002-2010 Michael 'Mickey' Lauer <mlauer@vanille-media.de>
 # Visit the Python for Embedded Systems Site => http://www.Vanille.de/projects/python.spy
-""" % ( sys.argv[0], __version__ ) )
+""" % ( sys.argv[0], ' --native' if isNative else '', __version__ ) )
 
     #
     # helper functions
@@ -65,6 +70,20 @@ class MakefileMaker:
 
         global VERSION
 
+        #
+        # generate rprovides line for native
+        #
+
+        if self.isNative:
+            rprovideLine = 'RPROVIDES+="'
+            for name in sorted(self.packages):
+                rprovideLine += "%s-native " % name.replace( '${PN}', 'python' )
+            rprovideLine += '"'
+
+            self.out( rprovideLine )
+            self.out( "" )
+            return
+
         #
         # generate provides line
         #
@@ -147,17 +166,21 @@ class MakefileMaker:
         self.doEpilog()
 
 if __name__ == "__main__":
+    parser = argparse.ArgumentParser( description='generate python manifest' )
+    parser.add_argument( '-n', '--native', help='generate manifest for native python', action='store_true' )
+    parser.add_argument( 'outfile', metavar='OUTPUT_FILE', nargs='?', default='', help='Output file (defaults to stdout)' )
+    args = parser.parse_args()
 
-    if len( sys.argv ) > 1:
+    if args.outfile:
         try:
-            os.unlink(sys.argv[1])
+            os.unlink( args.outfile )
         except Exception:
             sys.exc_clear()
-        outfile = open( sys.argv[1], "w" )
+        outfile = open( args.outfile, "w" )
     else:
         outfile = sys.stdout
 
-    m = MakefileMaker( outfile )
+    m = MakefileMaker( outfile, args.native )
 
     # Add packages here. Only specify dlopen-style library dependencies here, no ldd-style dependencies!
     # Parameters: revision, name, description, dependencies, filenames