D12032: stream-clone: add a explicit set list requirements relevant to stream clone

[marmoute (Pierre-Yves David)]

marmoute created this revision.
Herald added a reviewer: hg-reviewers.
Herald added a subscriber: mercurial-patches.

REVISION SUMMARY
  This set explicitly lists all the requirements that "stream clone" will
  preserve. Any other one will not be preserved.
  
  The role of listing the relevant one was previously filled by
  `repo.supportedformat`, but it seems clearer to use that such global and
  explicit set. The `repo.supportedformat` attribute will be cleaned up in a later
  changeset
  
  The true meaning of `repo.supportedformat` vs `repo._basesupported` was lost
  over time so, the content is currently bad. For example, `dirstate-v2` is
  currently considered relevant to the stream clone, or internal phase is
  missing. We kept the same content in this changeset and we will fix them later.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D12032

AFFECTED FILES
  mercurial/bundlecaches.py
  mercurial/requirements.py
  mercurial/streamclone.py

CHANGE DETAILS

diff --git a/mercurial/streamclone.py b/mercurial/streamclone.py
--- a/mercurial/streamclone.py
+++ b/mercurial/streamclone.py
@@ -32,9 +32,7 @@
 )
 
 
-def new_stream_clone_requirements(
-    supported_formats, default_requirements, streamed_requirements
-):
+def new_stream_clone_requirements(default_requirements, streamed_requirements):
     """determine the final set of requirement for a new stream clone
 
     this method combine the "default" requirements that a new repository would
@@ -42,7 +40,7 @@
     configuration choice when possible.
     """
     requirements = set(default_requirements)
-    requirements -= supported_formats
+    requirements -= requirementsmod.STREAM_FIXED_REQUIREMENTS
     requirements.update(streamed_requirements)
     return requirements
 
@@ -52,7 +50,9 @@
 
     This is used for advertising the stream options and to generate the actual
     stream content."""
-    requiredformats = repo.requirements & repo.supportedformats
+    requiredformats = (
+        repo.requirements & requirementsmod.STREAM_FIXED_REQUIREMENTS
+    )
     return requiredformats
 
 
@@ -209,7 +209,6 @@
     with repo.lock():
         consumev1(repo, fp, filecount, bytecount)
         repo.requirements = new_stream_clone_requirements(
-            repo.supportedformats,
             repo.requirements,
             requirements,
         )
@@ -820,7 +819,6 @@
     consumev2(repo, fp, filecount, filesize)
 
     repo.requirements = new_stream_clone_requirements(
-        repo.supportedformats,
         repo.requirements,
         requirements,
     )
diff --git a/mercurial/requirements.py b/mercurial/requirements.py
--- a/mercurial/requirements.py
+++ b/mercurial/requirements.py
@@ -89,3 +89,23 @@
     SHARESAFE_REQUIREMENT,
     DIRSTATE_V2_REQUIREMENT,
 }
+
+# List of requirement that impact "stream-clone" (and hardlink clone) and
+# cannot be changed in such cache.
+#
+# requirements not in this list are safe to be altered during stream-clone.
+#
+# note: the list is currently inherited from previous code and miss some relevant requirement while containing some irrelevant ones.
+STREAM_FIXED_REQUIREMENTS = {
+    BOOKMARKS_IN_STORE_REQUIREMENT,
+    CHANGELOGV2_REQUIREMENT,
+    COPIESSDC_REQUIREMENT,
+    DIRSTATE_V2_REQUIREMENT,
+    GENERALDELTA_REQUIREMENT,
+    NODEMAP_REQUIREMENT,
+    REVLOGV1_REQUIREMENT,
+    REVLOGV2_REQUIREMENT,
+    SHARESAFE_REQUIREMENT,
+    SPARSEREVLOG_REQUIREMENT,
+    TREEMANIFEST_REQUIREMENT,
+}
diff --git a/mercurial/bundlecaches.py b/mercurial/bundlecaches.py
--- a/mercurial/bundlecaches.py
+++ b/mercurial/bundlecaches.py
@@ -195,7 +195,7 @@
     # repo supports and error if the bundle isn't compatible.
     if version == b'packed1' and b'requirements' in params:
         requirements = set(params[b'requirements'].split(b','))
-        missingreqs = requirements - repo.supportedformats
+        missingreqs = requirements - requirementsmod.STREAM_FIXED_REQUIREMENTS
         if missingreqs:
             raise error.UnsupportedBundleSpecification(
                 _(b'missing support for repository features: %s')



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