[PATCH v2] binman: Skip node generation for images read from files

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

We can and should run the node generator only when creating a new image.
When we read it back, there is no need to generate nodes - they already
exits, and binman does not dive that deep into the image - and there is
no way to provide the required fdt-list. So forward the mode from the
image to every Entry object it contains so that Entry_fit can simply
skip generator nodes when reading them from an fdtmap.

This unbreaks all read-backs of images that contain generator nodes in
their fdtmap.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

Changes in v2:
  - more verbose commit log

  tools/binman/entry.py         | 5 ++++-
  tools/binman/etype/fit.py     | 2 +-
  tools/binman/etype/section.py | 4 ++--
  tools/binman/image.py         | 7 ++++---
  4 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/tools/binman/entry.py b/tools/binman/entry.py
index bac90bbbcd..fdb9746fda 100644
--- a/tools/binman/entry.py
+++ b/tools/binman/entry.py
@@ -75,7 +75,7 @@ class Entry(object):
              available. This is mainly used for testing.
          external: True if this entry contains an external binary blob
      """
-    def __init__(self, section, etype, node, name_prefix=''):
+    def __init__(self, section, etype, node, name_prefix='', generate=None):
          # Put this here to allow entry-docs and help to work without libfdt
          global state
          from binman import state
@@ -105,6 +105,9 @@ class Entry(object):
          self.external = False
          self.allow_missing = False
          self.allow_fake = False
+        if generate == None:
+            generate = section.generate if section else True
+        self.generate = generate
  
      @staticmethod
      def FindEntryClass(etype, expanded):
diff --git a/tools/binman/etype/fit.py b/tools/binman/etype/fit.py
index b41187df80..4e4d2f9c22 100644
--- a/tools/binman/etype/fit.py
+++ b/tools/binman/etype/fit.py
@@ -193,7 +193,7 @@ class Entry_fit(Entry):
                      # the FIT (e.g. "/images/kernel/u-boot"), so don't call
                      # fsw.add_node() or _AddNode() for it.
                      pass
-                elif subnode.name.startswith('@'):
+                elif self.generate and subnode.name.startswith('@'):
                      if self._fdts:
                          # Generate notes for each FDT
                          for seq, fdt_fname in enumerate(self._fdts):
diff --git a/tools/binman/etype/section.py b/tools/binman/etype/section.py
index 7a55d03231..319156a09a 100644
--- a/tools/binman/etype/section.py
+++ b/tools/binman/etype/section.py
@@ -154,9 +154,9 @@ class Entry_section(Entry):
      available. This is set by the `SetAllowMissing()` method, if
      `--allow-missing` is passed to binman.
      """
-    def __init__(self, section, etype, node, test=False):
+    def __init__(self, section, etype, node, test=False, generate=None):
          if not test:
-            super().__init__(section, etype, node)
+            super().__init__(section, etype, node, generate=generate)
          self._entries = OrderedDict()
          self._pad_byte = 0
          self._sort = False
diff --git a/tools/binman/image.py b/tools/binman/image.py
index f0a7d65299..1ff97e687c 100644
--- a/tools/binman/image.py
+++ b/tools/binman/image.py
@@ -69,8 +69,9 @@ class Image(section.Entry_section):
              version which does not support all the entry types.
      """
      def __init__(self, name, node, copy_to_orig=True, test=False,
-                 ignore_missing=False, use_expanded=False, missing_etype=False):
-        super().__init__(None, 'section', node, test=test)
+                 ignore_missing=False, use_expanded=False, missing_etype=False,
+                 generate=True):
+        super().__init__(None, 'section', node, test=test, generate=generate)
          self.copy_to_orig = copy_to_orig
          self.name = 'main-section'
          self.image_name = name
@@ -130,7 +131,7 @@ class Image(section.Entry_section):
          # Return an Image with the associated nodes
          root = dtb.GetRoot()
          image = Image('image', root, copy_to_orig=False, ignore_missing=True,
-                      missing_etype=True)
+                      missing_etype=True, generate=False)
  
          image.image_node = fdt_util.GetString(root, 'image-node', 'image')
          image.fdtmap_dtb = dtb
-- 
2.31.1