[PATCH 1/2] meta/classes/base: extend sys.path with lib directory

[claudius.heine.ext@siemens.com]

From: Claudius Heine <ch@denx.de>

Currently scripts and modules that are placed in the 'lib' directory of
layers are not available in the recipes.

This change adds the required code to the base.bbclass in order to have
those imports available.

This change contains code from:
http://git.openembedded.org/openembedded-core/tree/meta/classes/base.bbclass?id=4a4eff9b9e3c614ff41b17cbec359b72dcbd41bd

Signed-off-by: Claudius Heine <ch@denx.de>
---
 meta/classes/base.bbclass | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index ae84677..3334789 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -37,6 +37,30 @@ bbfatal() {
 	exit 1
 }
 
+# Derived from openembedded-core/meta/classes/base.bbclass
+ISAR_IMPORTS += "os sys time"
+
+def isar_imports(d):
+	import sys
+
+	bbpath = d.getVar("BBPATH").split(":")
+	sys.path[0:0] = [os.path.join(dir, "lib") for dir in bbpath]
+
+	def inject(name, value):
+		"""Make a python object accessible from the metadata"""
+		if hasattr(bb.utils, "_context"):
+			bb.utils._context[name] = value
+		else:
+			__builtins__[name] = value
+
+	for toimport in d.getVar("ISAR_IMPORTS", True).split():
+		imported = __import__(toimport)
+		inject(toimport.split(".", 1)[0], imported)
+
+	return ""
+
+ISAR_IMPORTED := "${@isar_imports(d)}"
+
 # Derived from bitbake: bitbake/classes/base.bbclass
 addtask showdata
 do_showdata[nostamp] = "1"
-- 
2.15.1