D6945: sidedatacopies: add a new requirement for storing copies into sidedata

[marmoute (Pierre-Yves David)]

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

REVISION SUMMARY
  The end goal is to have changesets centric sidedata information stored into
  changelog sidedata. This make it possible to use the changeset based copy
  tracing algorithm on any repository without affecting hashes.
  
  The actual implementation is coming. The feature is marked as experimental
  (do not use in production) until we stabilise details about the format.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D6945

AFFECTED FILES
  mercurial/configitems.py
  mercurial/localrepo.py

CHANGE DETAILS

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -398,6 +398,10 @@
 # information for revision without altering their original hashes.
 SIDEDATA_REQUIREMENT = 'exp-sidedata-flag'
 
+# A repository with the the copies-sidedata-changeset requirement will store
+# copies related information in changeset's sidedata.
+COPIESSDC_REQUIREMENT = 'exp-copies-sidedata-changeset'
+
 # Functions receiving (ui, features) that extensions can register to impact
 # the ability to load repositories with custom requirements. Only
 # functions defined in loaded extensions are called.
@@ -923,6 +927,7 @@
         'revlogv1',
         'generaldelta',
         'treemanifest',
+        COPIESSDC_REQUIREMENT,
         REVLOGV2_REQUIREMENT,
         SIDEDATA_REQUIREMENT,
         SPARSEREVLOG_REQUIREMENT,
@@ -3165,6 +3170,10 @@
     # experimental config: format.use-side-data
     if ui.configbool('format', 'use-side-data'):
         requirements.add(SIDEDATA_REQUIREMENT)
+    # experimental config: format.exp-use-copies-side-data-changeset
+    if ui.configbool('format', 'exp-use-copies-side-data-changeset'):
+        requirements.add(SIDEDATA_REQUIREMENT)
+        requirements.add(COPIESSDC_REQUIREMENT)
     if ui.configbool('experimental', 'treemanifest'):
         requirements.add('treemanifest')
 
diff --git a/mercurial/configitems.py b/mercurial/configitems.py
--- a/mercurial/configitems.py
+++ b/mercurial/configitems.py
@@ -733,6 +733,10 @@
 coreconfigitem('format', 'usestore',
     default=True,
 )
+coreconfigitem('format', 'exp-use-copies-side-data-changeset',
+    default=False,
+    experimental=True,
+)
 coreconfigitem('format', 'use-side-data',
     default=False,
     experimental=True,



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