return files
+def canonicalize(paths, sep=','):
+ """Given a string with paths (separated by commas by default), expand
+ each path using os.path.realpath() and return the resulting paths as a
+ string (separated using the same separator a the original string).
+ """
+ # Ignore paths containing "$" as they are assumed to be unexpanded bitbake
+ # variables. Normally they would be ignored, e.g., when passing the paths
+ # through the shell they would expand to empty strings. However, when they
+ # are passed through os.path.realpath(), it will cause them to be prefixed
+ # with the absolute path to the current directory and thus not be empty
+ # anymore.
+ #
+ # Also maintain trailing slashes, as the paths may actually be used as
+ # prefixes in sting compares later on, where the slashes then are important.
+ canonical_paths = []
+ for path in (paths or '').split(sep):
+ if '$' not in path:
+ trailing_slash = path.endswith('/') and '/' or ''
+ canonical_paths.append(os.path.realpath(path) + trailing_slash)
+
+ return sep.join(canonical_paths)
