From patchwork Fri Dec 10 10:36:21 2021
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Subject: D11892: share: make it possible to control the working copy format
 variant
From: phabricator <phabricator@mercurial-scm.org>
X-Patchwork-Id: 50218
Message-Id: <differential-rev-PHID-DREV-lqxrxelkx4lgrmdnrtvy-req@mercurial-scm.org>
To: Phabricator <phabricator@mercurial-scm.org>
Cc: mercurial-devel@mercurial-scm.org
Date: Fri, 10 Dec 2021 10:36:21 +0000

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

REVISION SUMMARY
  A share will use the same format as its source for the store, but there are no
  reason to not lets it control the working copy variant at creation time.
  
  So we make it so.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D11892

AFFECTED FILES
  mercurial/localrepo.py
  tests/test-share.t

CHANGE DETAILS




To: marmoute, #hg-reviewers
Cc: mercurial-patches, mercurial-devel

diff --git a/tests/test-share.t b/tests/test-share.t
--- a/tests/test-share.t
+++ b/tests/test-share.t
@@ -284,3 +284,25 @@
   $ hg share nostore sharednostore
   abort: cannot create shared repository as source was created with 'format.usestore' config disabled
   [255]
+
+Check that (safe) share can control wc-specific format variant at creation time
+-------------------------------------------------------------------------------
+
+#if no-rust
+
+  $ cat << EOF >> $HGRCPATH
+  > [storage]
+  > dirstate-v2.slow-path = allow
+  > EOF
+
+#endif
+
+  $ hg init repo-safe-d1 --config format.use-share-safe=yes --config format.exp-rc-dirstate-v2=no
+  $ hg debugformat -R repo-safe-d1 | grep dirstate-v2
+  dirstate-v2:         no
+
+  $ hg share repo-safe-d1 share-safe-d2 --config format.use-share-safe=yes --config format.exp-rc-dirstate-v2=yes
+  updating working directory
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg debugformat  -R share-safe-d2 | grep dirstate-v2
+  dirstate-v2:        yes
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1,4 +1,5 @@
 # localrepo.py - read/write repository class for mercurial
+# coding: utf-8
 #
 # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
 #
@@ -3661,17 +3662,36 @@
     if ui.configbool(b'format', b'use-share-safe'):
         requirements.add(requirementsmod.SHARESAFE_REQUIREMENT)
 
-    # If the repo is being created from a shared repository, we copy
-    # its requirements.
+    # if we are creating a share-repo¹  we have to handle requirement
+    # differently.
+    #
+    # [1] (i.e. reusing the store from another repository, just having a
+    # working copy)
     if b'sharedrepo' in createopts:
-        requirements = set(createopts[b'sharedrepo'].requirements)
+        source_requirements = set(createopts[b'sharedrepo'].requirements)
+
+        if requirementsmod.SHARESAFE_REQUIREMENT not in source_requirements:
+            # share to an old school repository, we have to copy the
+            # requirements and hope for the best.
+            requirements = source_requirements
+        else:
+            # We have control on the working copy only, so "copy" the non
+            # working copy part over, ignoring previous logic.
+            to_drop = set()
+            for req in requirements:
+                if req in requirementsmod.WORKING_DIR_REQUIREMENTS:
+                    continue
+                if req in source_requirements:
+                    continue
+                to_drop.add(req)
+            requirements -= to_drop
+            requirements |= source_requirements
+
         if createopts.get(b'sharedrelative'):
             requirements.add(requirementsmod.RELATIVE_SHARED_REQUIREMENT)
         else:
             requirements.add(requirementsmod.SHARED_REQUIREMENT)
 
-        return requirements
-
     return requirements