[PATCH] parse/cache/cooker: Preserve order in the file inclusion list

[Richard Purdie <richard.purdie@linuxfoundation.org>]

The data returned by get_file_depends() may me used in contexts like
checksums where order is important. The current usage of sets means
that some of the checksums can change in circumstances they should not.

This patch changes to use lists, thereby removing the problem.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/cache.py b/bitbake/lib/bb/cache.py
index 619b9ee..a3c073a 100644
--- a/bitbake/lib/bb/cache.py
+++ b/bitbake/lib/bb/cache.py
@@ -405,12 +405,12 @@ class Cache(object):
         """Parse the specified filename, returning the recipe information"""
         infos = []
         datastores = cls.load_bbfile(filename, appends, configdata)
-        depends = set()
+        depends = []
         for variant, data in sorted(datastores.iteritems(),
                                     key=lambda i: i[0],
                                     reverse=True):
             virtualfn = cls.realfn2virtual(filename, variant)
-            depends |= (data.getVar("__depends", False) or set())
+            depends = depends + (data.getVar("__depends", False) or [])
             if depends and not variant:
                 data.setVar("__depends", depends)
 
diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
index e299059..98d6957 100644
--- a/bitbake/lib/bb/cooker.py
+++ b/bitbake/lib/bb/cooker.py
@@ -692,8 +692,8 @@ class BBCooker:
         # Generate a list of parsed configuration files by searching the files
         # listed in the __depends and __base_depends variables with a .conf suffix.
         conffiles = []
-        dep_files = self.configuration.data.getVar('__depends') or set()
-        dep_files.union(self.configuration.data.getVar('__base_depends') or set())
+        dep_files = self.configuration.data.getVar('__base_depends') or []
+        dep_files = dep_files + (self.configuration.data.getVar('__depends') or [])
 
         for f in dep_files:
             if f[0].endswith(".conf"):
diff --git a/bitbake/lib/bb/parse/__init__.py b/bitbake/lib/bb/parse/__init__.py
index 7b9c47e..4293d09c 100644
--- a/bitbake/lib/bb/parse/__init__.py
+++ b/bitbake/lib/bb/parse/__init__.py
@@ -73,8 +73,7 @@ def update_mtime(f):
 def mark_dependency(d, f):
     if f.startswith('./'):
         f = "%s/%s" % (os.getcwd(), f[2:])
-    deps = d.getVar('__depends') or set()
-    deps.update([(f, cached_mtime(f))])
+    deps = (d.getVar('__depends') or []) + [(f, cached_mtime(f))]
     d.setVar('__depends', deps)
 
 def supports(fn, data):
@@ -134,8 +133,8 @@ def vars_from_file(mypkg, d):
 def get_file_depends(d):
     '''Return the dependent files'''
     dep_files = []
-    depends = d.getVar('__depends', True) or set()
-    depends = depends.union(d.getVar('__base_depends', True) or set())
+    depends = d.getVar('__base_depends', True) or []
+    depends = depends + (d.getVar('__depends', True) or [])
     for (fn, _) in depends:
         dep_files.append(os.path.abspath(fn))
     return " ".join(dep_files)