wireprotov2: let clients drive delta behavior

Previously, the "manifestdata" and "filedata" commands assumed the
receiver had all parent revisions for requested nodes. Unless the
revision had no parents, they emitted a delta instead of a fulltext.

This strategy isn't appropriate for shallow clones and for clients
that only want to access fulltext revision data for a single node
without fetching their parent revisions.

This commit adds an "haveparents" argument to the "manifestdata"
and "filedata" commands that controls delta generation behavior.

Unless "haveparents" is set, the server assumes that the client
doesn't have parent revisions unless they were previously sent
as part of the current group of revisions.

This change allows the fulltext revision data of any individual
revision to be obtained. This will facilitate shallow clones
and other data retrieval strategies that don't require all previous
revisions of an entity to be fetched.

Differential Revision: https://phab.mercurial-scm.org/D4492

mercurial/exchangev2.py

@@ -283,6 +283,7 def _fetchmanifests(repo, tr, remote, ma
                 b'tree': b'',
                 b'nodes': batch,
                 b'fields': {b'parents', b'revision'},
+                b'haveparents': True,
             }).result()
 
             # Chomp off header object.
@@ -374,7 +375,8 def _fetchfiles(repo, tr, remote, fnodes
                 fs.append((path, e.callcommand(b'filedata', {
                     b'path': path,
                     b'nodes': sorted(nodes),
-                    b'fields': {b'parents', b'revision'}
+                    b'fields': {b'parents', b'revision'},
+                    b'haveparents': True,
                 })))
 
                 locallinkrevs[path] = {

mercurial/help/internals/wireprotocolv2.txt

@@ -213,6 +213,14 fields
    revision
       The raw revision data for a file.
 
+haveparents
+   (bool) Whether the client has the parent revisions of all requested
+   nodes. If set, the server may emit revision data as deltas against
+   any parent revision. If not set, the server MUST only emit deltas for
+   revisions previously emitted by this command.
+
+   False is assumed in the absence of any value.
+
 nodes
    (array of bytestrings) File nodes whose data to retrieve.
 
@@ -349,6 +357,14 fields
    revision
       The raw revision data for the manifest.
 
+haveparents
+   (bool) Whether the client has the parent revisions of all requested
+   nodes. If set, the server may emit revision data as deltas against
+   any parent revision. If not set, the server MUST only emit deltas for
+   revisions previously emitted by this command.
+
+   False is assumed in the absence of any value.
+
 nodes
    (array of bytestring) Manifest nodes whose data to retrieve.
 
@@ -361,7 +377,6 TODO allow specifying revisions via alte
 revisions or ranges)
 TODO consider recursive expansion of manifests (with path filtering for
 narrow use cases)
-TODO more control over whether to emit fulltexts or deltas
 
 The response bytestream starts with a CBOR map describing the data that
 follows. It has the following bytestring keys:

mercurial/wireprotov2server.py

@@ -415,7 +415,7 def _capabilitiesv2(repo, proto):
 
     return proto.addcapabilities(repo, caps)
 
-def builddeltarequests(store, nodes):
+def builddeltarequests(store, nodes, haveparents):
     """Build a series of revision delta requests against a backend store.
 
     Returns a list of revision numbers in the order they should be sent
@@ -430,50 +430,69 def builddeltarequests(store, nodes):
     revs = dagop.linearize({store.rev(n) for n in nodes}, store.parentrevs)
 
     requests = []
+    seenrevs = set()
 
     for rev in revs:
         node = store.node(rev)
-        parents = store.parents(node)
-        deltaparent = store.node(store.deltaparent(rev))
+        parentnodes = store.parents(node)
+        parentrevs = [store.rev(n) for n in parentnodes]
+        deltabaserev = store.deltaparent(rev)
+        deltabasenode = store.node(deltabaserev)
 
-        # There is a delta in storage. That means we can send the delta
-        # efficiently.
+        # The choice of whether to send a fulltext revision or a delta and
+        # what delta to send is governed by a few factors.
         #
-        # But, the delta may be against a revision the receiver doesn't
-        # have (e.g. shallow clone or when the delta isn't against a parent
-        # revision). For now, we ignore the problem of shallow clone. As
-        # long as a delta exists against a parent, we send it.
-        # TODO allow arguments to control this behavior, as the receiver
-        # may not have the base revision in some scenarios.
-        if deltaparent != nullid and deltaparent in parents:
-            basenode = deltaparent
+        # To send a delta, we need to ensure the receiver is capable of
+        # decoding it. And that requires the receiver to have the base
+        # revision the delta is against.
+        #
+        # We can only guarantee the receiver has the base revision if
+        # a) we've already sent the revision as part of this group
+        # b) the receiver has indicated they already have the revision.
+        # And the mechanism for "b" is the client indicating they have
+        # parent revisions. So this means we can only send the delta if
+        # it is sent before or it is against a delta and the receiver says
+        # they have a parent.
 
-        # Else there is no delta parent in storage or the delta that is
-        # # there isn't suitable. Let's use a delta against a parent
-        # revision, if possible.
-        #
-        # There is room to check if the delta parent is in the ancestry of
-        # this node. But there isn't an API on the manifest storage object
-        # for that. So ignore this case for now.
+        # We can send storage delta if it is against a revision we've sent
+        # in this group.
+        if deltabaserev != nullrev and deltabaserev in seenrevs:
+            basenode = deltabasenode
+
+        # We can send storage delta if it is against a parent revision and
+        # the receiver indicates they have the parents.
+        elif (deltabaserev != nullrev and deltabaserev in parentrevs
+              and haveparents):
+            basenode = deltabasenode
 
-        elif parents[0] != nullid:
-            basenode = parents[0]
-        elif parents[1] != nullid:
-            basenode = parents[1]
+        # Otherwise the storage delta isn't appropriate. Fall back to
+        # using another delta, if possible.
 
-        # No potential bases to delta against. Send a full revision.
+        # Use p1 if we've emitted it or receiver says they have it.
+        elif parentrevs[0] != nullrev and (
+            parentrevs[0] in seenrevs or haveparents):
+            basenode = parentnodes[0]
+
+        # Use p2 if we've emitted it or receiver says they have it.
+        elif parentrevs[1] != nullrev and (
+            parentrevs[1] in seenrevs or haveparents):
+            basenode = parentnodes[1]
+
+        # Nothing appropriate to delta against. Send the full revision.
         else:
             basenode = nullid
 
         requests.append(changegroup.revisiondeltarequest(
             node=node,
-            p1node=parents[0],
-            p2node=parents[1],
+            p1node=parentnodes[0],
+            p2node=parentnodes[1],
             # Receiver deals with linknode resolution.
             linknode=nullid,
             basenode=basenode,
         ))
 
+        seenrevs.add(rev)
+
     return revs, requests
 
 def wireprotocommand(name, args=None, permission='push'):
@@ -674,12 +693,14 def getfilestore(repo, proto, path):
 
 @wireprotocommand('filedata',
                   args={
+                      'haveparents': True,
                       'nodes': [b'0123456...'],
                       'fields': [b'parents', b'revision'],
                       'path': b'foo.txt',
                   },
                   permission='pull')
-def filedata(repo, proto, nodes=None, fields=None, path=None):
+def filedata(repo, proto, haveparents=False, nodes=None, fields=None,
+             path=None):
     fields = fields or set()
 
     if nodes is None:
@@ -702,7 +723,7 def filedata(repo, proto, nodes=None, fi
             raise error.WireprotoCommandError('unknown file node: %s',
                                               (hex(node),))
 
-    revs, requests = builddeltarequests(store, nodes)
+    revs, requests = builddeltarequests(store, nodes, haveparents)
 
     yield {
         b'totalitems': len(revs),
@@ -804,11 +825,13 def lookupv2(repo, proto, key):
 @wireprotocommand('manifestdata',
                   args={
                       'nodes': [b'0123456...'],
+                      'haveparents': True,
                       'fields': [b'parents', b'revision'],
                       'tree': b'',
                   },
                   permission='pull')
-def manifestdata(repo, proto, nodes=None, fields=None, tree=None):
+def manifestdata(repo, proto, haveparents=False, nodes=None, fields=None,
+                 tree=None):
     fields = fields or set()
 
     if nodes is None:
@@ -829,7 +852,7 def manifestdata(repo, proto, nodes=None
             raise error.WireprotoCommandError(
                 'unknown node: %s', (node,))
 
-    revs, requests = builddeltarequests(store, nodes)
+    revs, requests = builddeltarequests(store, nodes, haveparents)
 
     yield {
         b'totalitems': len(revs),

tests/test-http-protocol.t

@@ -313,7 +313,7 Client with HTTPv2 enabled automatically
   s>     Content-Type: application/mercurial-cbor\r\n
   s>     Content-Length: *\r\n (glob)
   s>     \r\n
-  s>     \xa3GapibaseDapi/Dapis\xa1Pexp-http-v2-0001\xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1Nv1capabilitiesY\x01\xc5batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
+  s>     \xa3GapibaseDapi/Dapis\xa1Pexp-http-v2-0001\xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1Nv1capabilitiesY\x01\xc5batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
   sending heads command
   s>     POST /api/exp-http-v2-0001/ro/heads HTTP/1.1\r\n
   s>     Accept-Encoding: identity\r\n

tests/test-wireproto-command-capabilities.t

@@ -212,7 +212,7 Request for HTTPv2 service returns infor
   s>     Content-Type: application/mercurial-cbor\r\n
   s>     Content-Length: *\r\n (glob)
   s>     \r\n
-  s>     \xa3GapibaseDapi/Dapis\xa1Pexp-http-v2-0001\xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1Nv1capabilitiesY\x01\xc5batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
+  s>     \xa3GapibaseDapi/Dapis\xa1Pexp-http-v2-0001\xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1Nv1capabilitiesY\x01\xc5batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
   cbor> {
     b'apibase': b'api/',
     b'apis': {
@@ -258,6 +258,7 Request for HTTPv2 service returns infor
                 b'parents',
                 b'revision'
               ],
+              b'haveparents': True,
               b'nodes': [
                 b'0123456...'
               ],
@@ -307,6 +308,7 Request for HTTPv2 service returns infor
                 b'parents',
                 b'revision'
               ],
+              b'haveparents': True,
               b'nodes': [
                 b'0123456...'
               ],
@@ -367,7 +369,7 capabilities command returns expected in
   s>     Content-Type: application/mercurial-cbor\r\n
   s>     Content-Length: *\r\n (glob)
   s>     \r\n
-  s>     \xa3GapibaseDapi/Dapis\xa1Pexp-http-v2-0001\xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1Nv1capabilitiesY\x01\xc5batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
+  s>     \xa3GapibaseDapi/Dapis\xa1Pexp-http-v2-0001\xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1Nv1capabilitiesY\x01\xc5batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
   sending capabilities command
   s>     POST /api/exp-http-v2-0001/ro/capabilities HTTP/1.1\r\n
   s>     Accept-Encoding: identity\r\n
@@ -390,11 +392,11 capabilities command returns expected in
   s>     \xa1FstatusBok
   s>     \r\n
   received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
-  s>     2f4\r\n
-  s>     \xec\x02\x00\x01\x00\x02\x001
-  s>     \xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa3Ffields\x82GparentsHrevisionEnodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1
+  s>     30e\r\n
+  s>     \x06\x03\x00\x01\x00\x02\x001
+  s>     \xa4Hcommands\xaaIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullMchangesetdata\xa2Dargs\xa3Ffields\xd9\x01\x02\x82GparentsHrevisionInoderange\x82\x81J0123456...\x81Iabcdef...Enodes\x81J0123456...Kpermissions\x81DpullHfiledata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...DpathGfoo.txtKpermissions\x81DpullEheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullLmanifestdata\xa2Dargs\xa4Ffields\x82GparentsHrevisionKhaveparents\xf5Enodes\x81J0123456...Dtree@Kpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyInamespaceBnsCnewCnewColdColdKpermissions\x81DpushKcompression\x81\xa1DnameDzlibQframingmediatypes\x81X&application/mercurial-exp-framing-0005Nrawrepoformats\x82LgeneraldeltaHrevlogv1
   s>     \r\n
-  received frame(size=748; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
+  received frame(size=774; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
   s>     8\r\n
   s>     \x00\x00\x00\x01\x00\x02\x002
   s>     \r\n
@@ -444,6 +446,7 capabilities command returns expected in
               b'parents',
               b'revision'
             ],
+            b'haveparents': True,
             b'nodes': [
               b'0123456...'
             ],
@@ -493,6 +496,7 capabilities command returns expected in
               b'parents',
               b'revision'
             ],
+            b'haveparents': True,
             b'nodes': [
               b'0123456...'
             ],

tests/test-wireproto-command-filedata.t

@@ -253,6 +253,7 Requesting parents works
   ]
 
 Requesting revision data works
+(haveparents defaults to False, so fulltext is emitted)
 
   $ sendhttpv2peer << EOF
   > command filedata
@@ -283,6 +284,114 Requesting revision data works
   s>     \xa1FstatusBok
   s>     \r\n
   received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
+  s>     42\r\n
+  s>     :\x00\x00\x01\x00\x02\x001
+  s>     \xa1Jtotalitems\x01\xa2DnodeT\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xccLrevisionsize\x03Ca1\n
+  s>     \r\n
+  received frame(size=58; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
+  s>     8\r\n
+  s>     \x00\x00\x00\x01\x00\x02\x002
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n
+  received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
+  response: gen[
+    {
+      b'totalitems': 1
+    },
+    {
+      b'node': b'\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xcc',
+      b'revisionsize': 3
+    },
+    b'a1\n'
+  ]
+
+haveparents=False should be same as above
+
+  $ sendhttpv2peer << EOF
+  > command filedata
+  >     nodes eval:[b'\x9a\x38\x12\x29\x97\xb3\xac\x97\xbe\x2a\x9a\xa2\xe5\x56\x83\x83\x41\xfd\xf2\xcc']
+  >     path eval:b'a'
+  >     fields eval:[b'revision']
+  >     haveparents eval:False
+  > EOF
+  creating http peer for wire protocol version 2
+  sending filedata command
+  s>     POST /api/exp-http-v2-0001/ro/filedata HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     accept: application/mercurial-exp-framing-0005\r\n
+  s>     content-type: application/mercurial-exp-framing-0005\r\n
+  s>     content-length: 94\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     user-agent: Mercurial debugwireproto\r\n
+  s>     \r\n
+  s>     V\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa4Ffields\x81HrevisionKhaveparents\xf4Enodes\x81T\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xccDpathAaDnameHfiledata
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 OK\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-exp-framing-0005\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     13\r\n
+  s>     \x0b\x00\x00\x01\x00\x02\x011
+  s>     \xa1FstatusBok
+  s>     \r\n
+  received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
+  s>     42\r\n
+  s>     :\x00\x00\x01\x00\x02\x001
+  s>     \xa1Jtotalitems\x01\xa2DnodeT\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xccLrevisionsize\x03Ca1\n
+  s>     \r\n
+  received frame(size=58; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
+  s>     8\r\n
+  s>     \x00\x00\x00\x01\x00\x02\x002
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n
+  received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
+  response: gen[
+    {
+      b'totalitems': 1
+    },
+    {
+      b'node': b'\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xcc',
+      b'revisionsize': 3
+    },
+    b'a1\n'
+  ]
+
+haveparents=True should emit a delta
+
+  $ sendhttpv2peer << EOF
+  > command filedata
+  >     nodes eval:[b'\x9a\x38\x12\x29\x97\xb3\xac\x97\xbe\x2a\x9a\xa2\xe5\x56\x83\x83\x41\xfd\xf2\xcc']
+  >     path eval:b'a'
+  >     fields eval:[b'revision']
+  >     haveparents eval:True
+  > EOF
+  creating http peer for wire protocol version 2
+  sending filedata command
+  s>     POST /api/exp-http-v2-0001/ro/filedata HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     accept: application/mercurial-exp-framing-0005\r\n
+  s>     content-type: application/mercurial-exp-framing-0005\r\n
+  s>     content-length: 94\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     user-agent: Mercurial debugwireproto\r\n
+  s>     \r\n
+  s>     V\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa4Ffields\x81HrevisionKhaveparents\xf5Enodes\x81T\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xccDpathAaDnameHfiledata
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 OK\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-exp-framing-0005\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     13\r\n
+  s>     \x0b\x00\x00\x01\x00\x02\x011
+  s>     \xa1FstatusBok
+  s>     \r\n
+  received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
   s>     6e\r\n
   s>     f\x00\x00\x01\x00\x02\x001
   s>     \xa1Jtotalitems\x01\xa3MdeltabasenodeT+N\xb0s\x19\xbf\xa0w\xa4\n
@@ -308,7 +417,7 Requesting revision data works
   ]
 
 Requesting multiple revisions works
-(first revision should be fulltext, subsequents are deltas)
+(first revision is a fulltext since haveparents=False by default)
 
   $ sendhttpv2peer << EOF
   > command filedata
@@ -465,13 +574,12 Requesting parents and revision data wor
   s>     \xa1FstatusBok
   s>     \r\n
   received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
-  s>     a1\r\n
-  s>     \x99\x00\x00\x01\x00\x02\x001
-  s>     \xa1Jtotalitems\x01\xa4MdeltabasenodeT+N\xb0s\x19\xbf\xa0w\xa4\n
-  s>     /\x04\x916Y\xae\xf0\xdaB\xdaIdeltasize\x0fDnodeT\x08y4^97r)cKB\x0cc\x94T\x15g&\xc6\xb6Gparents\x82T+N\xb0s\x19\xbf\xa0w\xa4\n
-  s>     /\x04\x916Y\xae\xf0\xdaB\xdaT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00O\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x03a2\n
+  s>     75\r\n
+  s>     m\x00\x00\x01\x00\x02\x001
+  s>     \xa1Jtotalitems\x01\xa3DnodeT\x08y4^97r)cKB\x0cc\x94T\x15g&\xc6\xb6Gparents\x82T+N\xb0s\x19\xbf\xa0w\xa4\n
+  s>     /\x04\x916Y\xae\xf0\xdaB\xdaT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00Lrevisionsize\x03Ca2\n
   s>     \r\n
-  received frame(size=153; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
+  received frame(size=109; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
   s>     8\r\n
   s>     \x00\x00\x00\x01\x00\x02\x002
   s>     \r\n
@@ -483,15 +591,14 Requesting parents and revision data wor
       b'totalitems': 1
     },
     {
-      b'deltabasenode': b'+N\xb0s\x19\xbf\xa0w\xa4\n/\x04\x916Y\xae\xf0\xdaB\xda',
-      b'deltasize': 15,
       b'node': b'\x08y4^97r)cKB\x0cc\x94T\x15g&\xc6\xb6',
       b'parents': [
         b'+N\xb0s\x19\xbf\xa0w\xa4\n/\x04\x916Y\xae\xf0\xdaB\xda',
         b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
-      ]
+      ],
+      b'revisionsize': 3
     },
-    b'\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x03a2\n'
+    b'a2\n'
   ]
 
   $ cat error.log

tests/test-wireproto-command-manifestdata.t

@@ -248,6 +248,7 Requesting parents works
   ]
 
 Requesting revision data works
+(haveparents defaults to false, so fulltext is emitted)
 
   $ sendhttpv2peer << EOF
   > command manifestdata
@@ -278,6 +279,124 Requesting revision data works
   s>     \xa1FstatusBok
   s>     \r\n
   received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
+  s>     167\r\n
+  s>     _\x01\x00\x01\x00\x02\x001
+  s>     \xa1Jtotalitems\x01\xa2DnodeTF\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0Lrevisionsize\x19\x01$Y\x01$a\x000879345e39377229634b420c639454156726c6b6\n
+  s>     b\x00819e258d31a5e1606629f365bb902a1b21ee4216\n
+  s>     dir0/c\x00914445346a0ca0629bd47ceb5dfe07e4d4cf2501\n
+  s>     dir0/child0/e\x00bbba6c06b30f443d34ff841bc985c4d0827c6be4\n
+  s>     dir0/child1/f\x0012fc7dcd773b5a0a929ce195228083c6ddc9cec4\n
+  s>     dir0/d\x00538206dc971e521540d6843abfe6d16032f6d426\n
+  s>     \r\n
+  received frame(size=351; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
+  s>     8\r\n
+  s>     \x00\x00\x00\x01\x00\x02\x002
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n
+  received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
+  response: gen[
+    {
+      b'totalitems': 1
+    },
+    {
+      b'node': b'F\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0',
+      b'revisionsize': 292
+    },
+    b'a\x000879345e39377229634b420c639454156726c6b6\nb\x00819e258d31a5e1606629f365bb902a1b21ee4216\ndir0/c\x00914445346a0ca0629bd47ceb5dfe07e4d4cf2501\ndir0/child0/e\x00bbba6c06b30f443d34ff841bc985c4d0827c6be4\ndir0/child1/f\x0012fc7dcd773b5a0a929ce195228083c6ddc9cec4\ndir0/d\x00538206dc971e521540d6843abfe6d16032f6d426\n'
+  ]
+
+haveparents=False yields same output
+
+  $ sendhttpv2peer << EOF
+  > command manifestdata
+  >     nodes eval:[b'\x46\xa6\x72\x1b\x5e\xda\xf0\xea\x04\xb7\x9a\x5c\xb3\x21\x88\x54\xa4\xd2\xab\xa0']
+  >     tree eval:b''
+  >     fields eval:[b'revision']
+  >     haveparents eval:False
+  > EOF
+  creating http peer for wire protocol version 2
+  sending manifestdata command
+  s>     POST /api/exp-http-v2-0001/ro/manifestdata HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     accept: application/mercurial-exp-framing-0005\r\n
+  s>     content-type: application/mercurial-exp-framing-0005\r\n
+  s>     content-length: 97\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     user-agent: Mercurial debugwireproto\r\n
+  s>     \r\n
+  s>     Y\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa4Ffields\x81HrevisionKhaveparents\xf4Enodes\x81TF\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0Dtree@DnameLmanifestdata
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 OK\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-exp-framing-0005\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     13\r\n
+  s>     \x0b\x00\x00\x01\x00\x02\x011
+  s>     \xa1FstatusBok
+  s>     \r\n
+  received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
+  s>     167\r\n
+  s>     _\x01\x00\x01\x00\x02\x001
+  s>     \xa1Jtotalitems\x01\xa2DnodeTF\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0Lrevisionsize\x19\x01$Y\x01$a\x000879345e39377229634b420c639454156726c6b6\n
+  s>     b\x00819e258d31a5e1606629f365bb902a1b21ee4216\n
+  s>     dir0/c\x00914445346a0ca0629bd47ceb5dfe07e4d4cf2501\n
+  s>     dir0/child0/e\x00bbba6c06b30f443d34ff841bc985c4d0827c6be4\n
+  s>     dir0/child1/f\x0012fc7dcd773b5a0a929ce195228083c6ddc9cec4\n
+  s>     dir0/d\x00538206dc971e521540d6843abfe6d16032f6d426\n
+  s>     \r\n
+  received frame(size=351; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
+  s>     8\r\n
+  s>     \x00\x00\x00\x01\x00\x02\x002
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n
+  received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
+  response: gen[
+    {
+      b'totalitems': 1
+    },
+    {
+      b'node': b'F\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0',
+      b'revisionsize': 292
+    },
+    b'a\x000879345e39377229634b420c639454156726c6b6\nb\x00819e258d31a5e1606629f365bb902a1b21ee4216\ndir0/c\x00914445346a0ca0629bd47ceb5dfe07e4d4cf2501\ndir0/child0/e\x00bbba6c06b30f443d34ff841bc985c4d0827c6be4\ndir0/child1/f\x0012fc7dcd773b5a0a929ce195228083c6ddc9cec4\ndir0/d\x00538206dc971e521540d6843abfe6d16032f6d426\n'
+  ]
+
+haveparents=True will emit delta
+
+  $ sendhttpv2peer << EOF
+  > command manifestdata
+  >     nodes eval:[b'\x46\xa6\x72\x1b\x5e\xda\xf0\xea\x04\xb7\x9a\x5c\xb3\x21\x88\x54\xa4\xd2\xab\xa0']
+  >     tree eval:b''
+  >     fields eval:[b'revision']
+  >     haveparents eval:True
+  > EOF
+  creating http peer for wire protocol version 2
+  sending manifestdata command
+  s>     POST /api/exp-http-v2-0001/ro/manifestdata HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     accept: application/mercurial-exp-framing-0005\r\n
+  s>     content-type: application/mercurial-exp-framing-0005\r\n
+  s>     content-length: 97\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     user-agent: Mercurial debugwireproto\r\n
+  s>     \r\n
+  s>     Y\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa4Ffields\x81HrevisionKhaveparents\xf5Enodes\x81TF\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0Dtree@DnameLmanifestdata
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 OK\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-exp-framing-0005\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     13\r\n
+  s>     \x0b\x00\x00\x01\x00\x02\x011
+  s>     \xa1FstatusBok
+  s>     \r\n
+  received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
   s>     98\r\n
   s>     \x90\x00\x00\x01\x00\x02\x001
   s>     \xa1Jtotalitems\x01\xa3MdeltabasenodeT\x1b\x17[Y_\x02,\xfa\xb5\xb8\t\xcc\x0e\xd5Q\xbd\x0b?\xf5\xe4Ideltasize\x187DnodeTF\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0X7\x00\x00\x00\x00\x00\x00\x00+\x00\x00\x00+a\x000879345e39377229634b420c639454156726c6b6\n
@@ -302,6 +421,8 Requesting revision data works
   ]
 
 Requesting multiple revisions works
+(haveparents defaults to false, so fulltext is emitted unless a parent
+has been emitted)
 
   $ sendhttpv2peer << EOF
   > command manifestdata
@@ -366,6 +487,72 Requesting multiple revisions works
     b'\x00\x00\x00\x00\x00\x00\x00+\x00\x00\x00+a\x000879345e39377229634b420c639454156726c6b6\n'
   ]
 
+With haveparents=True, first revision is a delta instead of fulltext
+
+  $ sendhttpv2peer << EOF
+  > command manifestdata
+  >     nodes eval:[b'\x1b\x17\x5b\x59\x5f\x02\x2c\xfa\xb5\xb8\x09\xcc\x0e\xd5\x51\xbd\x0b\x3f\xf5\xe4', b'\x46\xa6\x72\x1b\x5e\xda\xf0\xea\x04\xb7\x9a\x5c\xb3\x21\x88\x54\xa4\xd2\xab\xa0']
+  >     tree eval:b''
+  >     fields eval:[b'revision']
+  >     haveparents eval:True
+  > EOF
+  creating http peer for wire protocol version 2
+  sending manifestdata command
+  s>     POST /api/exp-http-v2-0001/ro/manifestdata HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     accept: application/mercurial-exp-framing-0005\r\n
+  s>     content-type: application/mercurial-exp-framing-0005\r\n
+  s>     content-length: 118\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     user-agent: Mercurial debugwireproto\r\n
+  s>     \r\n
+  s>     n\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa4Ffields\x81HrevisionKhaveparents\xf5Enodes\x82T\x1b\x17[Y_\x02,\xfa\xb5\xb8\t\xcc\x0e\xd5Q\xbd\x0b?\xf5\xe4TF\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0Dtree@DnameLmanifestdata
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 OK\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-exp-framing-0005\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     13\r\n
+  s>     \x0b\x00\x00\x01\x00\x02\x011
+  s>     \xa1FstatusBok
+  s>     \r\n
+  received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
+  s>     1ea\r\n
+  s>     \xe2\x01\x00\x01\x00\x02\x001
+  s>     \xa1Jtotalitems\x02\xa2DnodeT\x1b\x17[Y_\x02,\xfa\xb5\xb8\t\xcc\x0e\xd5Q\xbd\x0b?\xf5\xe4Lrevisionsize\x19\x01$Y\x01$a\x002b4eb07319bfa077a40a2f04913659aef0da42da\n
+  s>     b\x00819e258d31a5e1606629f365bb902a1b21ee4216\n
+  s>     dir0/c\x00914445346a0ca0629bd47ceb5dfe07e4d4cf2501\n
+  s>     dir0/child0/e\x00bbba6c06b30f443d34ff841bc985c4d0827c6be4\n
+  s>     dir0/child1/f\x0012fc7dcd773b5a0a929ce195228083c6ddc9cec4\n
+  s>     dir0/d\x00538206dc971e521540d6843abfe6d16032f6d426\n
+  s>     \xa3MdeltabasenodeT\x1b\x17[Y_\x02,\xfa\xb5\xb8\t\xcc\x0e\xd5Q\xbd\x0b?\xf5\xe4Ideltasize\x187DnodeTF\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0X7\x00\x00\x00\x00\x00\x00\x00+\x00\x00\x00+a\x000879345e39377229634b420c639454156726c6b6\n
+  s>     \r\n
+  received frame(size=482; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
+  s>     8\r\n
+  s>     \x00\x00\x00\x01\x00\x02\x002
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n
+  received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
+  response: gen[
+    {
+      b'totalitems': 2
+    },
+    {
+      b'node': b'\x1b\x17[Y_\x02,\xfa\xb5\xb8\t\xcc\x0e\xd5Q\xbd\x0b?\xf5\xe4',
+      b'revisionsize': 292
+    },
+    b'a\x002b4eb07319bfa077a40a2f04913659aef0da42da\nb\x00819e258d31a5e1606629f365bb902a1b21ee4216\ndir0/c\x00914445346a0ca0629bd47ceb5dfe07e4d4cf2501\ndir0/child0/e\x00bbba6c06b30f443d34ff841bc985c4d0827c6be4\ndir0/child1/f\x0012fc7dcd773b5a0a929ce195228083c6ddc9cec4\ndir0/d\x00538206dc971e521540d6843abfe6d16032f6d426\n',
+    {
+      b'deltabasenode': b'\x1b\x17[Y_\x02,\xfa\xb5\xb8\t\xcc\x0e\xd5Q\xbd\x0b?\xf5\xe4',
+      b'deltasize': 55,
+      b'node': b'F\xa6r\x1b^\xda\xf0\xea\x04\xb7\x9a\\\xb3!\x88T\xa4\xd2\xab\xa0'
+    },
+    b'\x00\x00\x00\x00\x00\x00\x00+\x00\x00\x00+a\x000879345e39377229634b420c639454156726c6b6\n'
+  ]
+
 Revisions are sorted by DAG order, parents first
 
   $ sendhttpv2peer << EOF

tests/test-wireproto-exchangev2.t

@@ -82,6 +82,7 Test basic clone
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
       '\xa9\x88\xfbCX>\x87\x1d\x1e\xd5u\x0e\xe0t\xc6\xd8@\xbb\xbf\xc8',
@@ -100,6 +101,7 Test basic clone
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '+N\xb0s\x19\xbf\xa0w\xa4\n/\x04\x916Y\xae\xf0\xdaB\xda',
       '\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xcc',
@@ -112,6 +114,7 Test basic clone
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\x81\x9e%\x8d1\xa5\xe1`f)\xf3e\xbb\x90*\x1b!\xeeB\x16',
       '\xb1zk\xd3g=\x9a\xb8\xce\xd5\x81\xa2\t\xf6/=\xa5\xccEx',
@@ -211,6 +214,7 Cloning only a specific revision works
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
       '\xa9\x88\xfbCX>\x87\x1d\x1e\xd5u\x0e\xe0t\xc6\xd8@\xbb\xbf\xc8'
@@ -226,6 +230,7 Cloning only a specific revision works
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '+N\xb0s\x19\xbf\xa0w\xa4\n/\x04\x916Y\xae\xf0\xdaB\xda',
       '\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xcc'
@@ -237,6 +242,7 Cloning only a specific revision works
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\x81\x9e%\x8d1\xa5\xe1`f)\xf3e\xbb\x90*\x1b!\xeeB\x16'
     ],
@@ -317,6 +323,7 Incremental pull works
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\xec\x80NH\x8c \x88\xc25\t\x9a\x10 u\x13\xbe\xcd\xc3\xdd\xa5',
       '\x04\\\x7f9\'\xda\x13\xe7Z\xf8\xf0\xe4\xf0HI\xe4a\xa9x\x0f',
@@ -333,6 +340,7 Incremental pull works
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '+N\xb0s\x19\xbf\xa0w\xa4\n/\x04\x916Y\xae\xf0\xdaB\xda',
       '\xc2\xa2\x05\xc8\xb2\xad\xe2J\xf2`b\xe5<\xd5\xbc8\x01\xd6`\xda'
@@ -344,6 +352,7 Incremental pull works
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\x81\x9e%\x8d1\xa5\xe1`f)\xf3e\xbb\x90*\x1b!\xeeB\x16',
       '\xb1zk\xd3g=\x9a\xb8\xce\xd5\x81\xa2\t\xf6/=\xa5\xccEx',
@@ -498,6 +507,7 Bookmarks are transferred on clone
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
       '\xa9\x88\xfbCX>\x87\x1d\x1e\xd5u\x0e\xe0t\xc6\xd8@\xbb\xbf\xc8',
@@ -516,6 +526,7 Bookmarks are transferred on clone
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '+N\xb0s\x19\xbf\xa0w\xa4\n/\x04\x916Y\xae\xf0\xdaB\xda',
       '\x9a8\x12)\x97\xb3\xac\x97\xbe*\x9a\xa2\xe5V\x83\x83A\xfd\xf2\xcc',
@@ -528,6 +539,7 Bookmarks are transferred on clone
       'parents',
       'revision'
     ]),
+    'haveparents': True,
     'nodes': [
       '\x81\x9e%\x8d1\xa5\xe1`f)\xf3e\xbb\x90*\x1b!\xeeB\x16',
       '\xb1zk\xd3g=\x9a\xb8\xce\xd5\x81\xa2\t\xf6/=\xa5\xccEx',