devtool: standard: fix update-recipe/finish --initial-rev override

Since 900129cbdf ("devtool: add support for git submodules") the
--initial-rev option of update-recipe and finish has been broken: the
parse loop in _get_patchset_revs() deliberately skips the recorded
"# initial_rev ." entry from the workspace bbappend when an override
is passed, but the override value itself is never inserted into the
initial_revs dict. For a recipe without submodules the dict therefore
ends up empty and update-recipe/finish fails in patch mode with:

  ERROR: Unable to find initial revision - please specify it with
  --initial-rev

i.e. passing --initial-rev produces the very error message that
instructs the user to pass --initial-rev. Before 900129cbdf the passed
value simply took precedence over the one recorded in the bbappend.

Seed initial_revs with the override before parsing so the option
behaves as documented again; recorded values are still used for
submodules and for the main repo when no override is given.

AI-Generated: Uses Claude (claude-fable-5)
(From OE-Core rev: ea008fd0d08e13a408e88f54347aee0f8c23fd9c)

Signed-off-by: Babanpreet Singh <bbnpreetsingh@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 62abb60b899e63ea6db5c745f4b1b6af0d4b40f1)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

scripts/lib/devtool/standard.py

@@ -1254,6 +1254,10 @@ def _get_patchset_revs(srctree, recipe_path, initial_rev=None, force_patch_refre
     commits = {}
     patches = []
     initial_revs = {}
+    if initial_rev:
+        # A user-specified override applies to the main repo ("."); the
+        # parse loop below leaves it in place of the recorded value
+        initial_revs["."] = initial_rev
     with open(recipe_path, 'r') as f:
         for line in f:
             pattern = r'^#\s.*\s(.*):\s([0-9a-fA-F]+)$'