tinfoil: Simplify remote datastore connections

The current approach to remote datastores used in tinfoil is breaking. For
example, adding a devupstream extension to a recipe with a git upstream,
making it the preferred version and then running "devtool modify" on it
causes get_srcrev() circular dependency issues. The problem is the override
handling in the datastore is broken.

This gets broken since remotedata:recieve_datastore() sets d.dict but doesn't
update d.overridedata (or d.inchistory or d.varhistory). We could play
whack-a-mole but the current implementation seems to be flawed to me. It
also doesn't cover, or only partially covers some datastore operations and
each needs new dedicated command API.

Instead, step back and reimplement the way the datastore connector works.

With this change, the datastore is either remote or local but the data is not
spread on two sides of the connection. All the API is proxied over the connection
by a single function for the datastore (and two to support variable history
and include history).

This code does not support using the datastore as a parameter to any data store
functions. We did have one case of that but its just bad code and can be
replaced.

The result is something which is much simpler and less invasive to the datastore
code itself, meaning its behaviour should be much more consistent. The existing
tests for the remote data no longer make any sense and are removed.

The one bug this code would have is if key/value pairs are returned over the IPC
and those values contained a DataSmart object since we don't recurse into return
values to find such things. Nothing appears to do that currently so lets worry
about it if its ever an issue. This change should simplfy a ton of other issues
and avoid a ton of other bugs so is a huge net gain.

Tested with bitbake's and OE's selftests.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 45 deletions

diff --git a/lib/bb/remotedata.py b/lib/bb/remotedata.py
index 7391e1b45..6c9864dd6 100644
--- a/lib/bb/remotedata.py
+++ b/lib/bb/remotedata.py
@@ -17,16 +17,16 @@ class RemoteDatastores:
         self.cooker = cooker
         self.datastores = {}
         self.locked = []
+        self.datastores[0] = self.cooker.data
         self.nextindex = 1
 
     def __len__(self):
         return len(self.datastores)
 
     def __getitem__(self, key):
-        if key is None:
-            return self.cooker.data
-        else:
-            return self.datastores[key]
+        # Cooker could have changed its datastore from under us
+        self.datastores[0] = self.cooker.data
+        return self.datastores[key]
 
     def items(self):
         return self.datastores.items()
@@ -63,44 +63,3 @@ class RemoteDatastores:
             raise Exception('Tried to release locked datastore %d' % idx)
         del self.datastores[idx]
 
-    def receive_datastore(self, remote_data):
-        """Receive a datastore object sent from the client (as prepared by transmit_datastore())"""
-        dct = dict(remote_data)
-        d = bb.data_smart.DataSmart()
-        d.dict = dct
-        while True:
-            if '_remote_data' in dct:
-                dsindex = dct['_remote_data']['_content']
-                del dct['_remote_data']
-                if dsindex is None:
-                    dct['_data'] = self.cooker.data.dict
-                else:
-                    dct['_data'] = self.datastores[dsindex].dict
-                break
-            elif '_data' in dct:
-                idct = dict(dct['_data'])
-                dct['_data'] = idct
-                dct = idct
-            else:
-                break
-        return d
-
-    @staticmethod
-    def transmit_datastore(d):
-        """Prepare a datastore object for sending over IPC from the client end"""
-        # FIXME content might be a dict, need to turn that into a list as well
-        def copy_dicts(dct):
-            if '_remote_data' in dct:
-                dsindex = dct['_remote_data']['_content'].dsindex
-                newdct = dct.copy()
-                newdct['_remote_data'] = {'_content': dsindex}
-                return list(newdct.items())
-            elif '_data' in dct:
-                newdct = dct.copy()
-                newdata = copy_dicts(dct['_data'])
-                if newdata:
-                    newdct['_data'] = newdata
-                return list(newdct.items())
-            return None
-        main_dict = copy_dicts(d.dict)
-        return main_dict