bitbake: [parse] Unify opening a file...

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/parse/__init__.py

@@ -80,5 +80,24 @@ def init(fn, data):
         if h['supports'](fn):
             return h['init'](data)
 
+def resolve_file(fn, d):
+    if not os.path.isabs(fn):
+        f = None
+        bbpath = (bb.data.getVar('BBPATH', d, 1) or '').split(':')
+        for p in bbpath:
+            j = os.path.join(p, fn)
+            if os.access(j, os.R_OK):
+                abs_fn = j
+                f = open(j, 'r')
+                break
+        if f is None:
+            raise IOError("file %s not found" % fn)
+    else:
+        f = open(fn,'r')
+        abs_fn = fn
+
+    bb.msg.debug(2, bb.msg.domain.Parsing, "LOAD %s" % abs_fn)
+    return (f, abs_fn)
+
 
 from parse_py import __version__, ConfHandler, BBHandler