[Request] [+- ] D9674: engine: refactor code to replace stores in separate function

[pulkit (Pulkit Goyal)]

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

REVISION SUMMARY
  In not all upgrades, we need to change the whole store. For example, when
  upgrading repository to share-safe mode, we don't touch revlogs at all hence
  store cloning and copying is not required.
  
  The store replacing code needs to be made aware about what all has changed and
  hence only copy/rename those things. To kickstart that, this patch moves
  existing logic into a separate function.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D9674

AFFECTED FILES
  mercurial/upgrade_utils/engine.py

CHANGE DETAILS

diff --git a/mercurial/upgrade_utils/engine.py b/mercurial/upgrade_utils/engine.py
--- a/mercurial/upgrade_utils/engine.py
+++ b/mercurial/upgrade_utils/engine.py
@@ -399,6 +399,25 @@
         yield path
 
 
+def _replacestores(currentrepo, upgradedrepo, backupvfs, upgrade_op):
+    """Replace the stores after current repository is upgraded
+
+    Creates a backup of current repository store at backup path
+    Replaces upgraded store files in current repo from upgraded one
+
+    Arguments:
+      currentrepo: repo object of current repository
+      upgradedrepo: repo object of the upgraded data
+      backupvfs: vfs object for the backup path
+      upgrade_op: upgrade operation object
+                  to be used to decide what all is upgraded
+    """
+    # TODO: don't blindly rename everything in store
+    # There can be upgrades where store is not touched at all
+    util.rename(currentrepo.spath, backupvfs.join(b'store'))
+    util.rename(upgradedrepo.spath, currentrepo.spath)
+
+
 def finishdatamigration(ui, srcrepo, dstrepo, requirements):
     """Hook point for extensions to perform additional actions during upgrade.
 
@@ -475,8 +494,7 @@
     # environments).
     ui.status(_(b'replacing store...\n'))
     tstart = util.timer()
-    util.rename(srcrepo.spath, backupvfs.join(b'store'))
-    util.rename(dstrepo.spath, srcrepo.spath)
+    _replacestores(srcrepo, dstrepo, backupvfs, upgrade_op)
     elapsed = util.timer() - tstart
     ui.status(
         _(



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