From patchwork Mon Dec 14 18:49:02 2020
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Subject: D9598: share: propery copy cache files when cloning from a share
From: phabricator <phabricator@mercurial-scm.org>
X-Patchwork-Id: 47896
Message-Id: <differential-rev-PHID-DREV-4xqfexxtij2m2qfkfkrl-req@mercurial-scm.org>
To: Phabricator <phabricator@mercurial-scm.org>
Cc: mercurial-devel@mercurial-scm.org
Date: Mon, 14 Dec 2020 18:49:02 +0000

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

REVISION SUMMARY
  If a is shared to b and b cloned to c, the old code would look directly
  under b/.hg for the cache directory and not use the cachevfs layer to
  pick the members from a/.hg/cache. Adjust variable names and comments to
  reflect that the function is used for more than just the branchmap
  cache.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D9598

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

CHANGE DETAILS




To: joerg.sonnenberger, #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
@@ -56,6 +56,17 @@
   rbc-revs-v1
   tags2-visible
 
+Cloning a shared repo should pick up the full cache dir on the other hand.
+
+  $ hg clone . ../repo2-clone
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ ls -1 ../repo2-clone/.hg/cache
+  branch2-served
+  rbc-names-v1
+  rbc-revs-v1
+  tags2-visible
+
 Some sed versions appends newline, some don't, and some just fails
 
   $ cat .hg/sharedpath; echo
diff --git a/mercurial/hg.py b/mercurial/hg.py
--- a/mercurial/hg.py
+++ b/mercurial/hg.py
@@ -590,16 +590,15 @@
     return srcpeer, peer(ui, peeropts, dest)
 
 
-# Recomputing branch cache might be slow on big repos,
-# so just copy it
+# Recomputing caches is often slow on big repos, so copy them.
 def _copycache(srcrepo, dstcachedir, fname):
     """copy a cache from srcrepo to destcachedir (if it exists)"""
-    srcbranchcache = srcrepo.vfs.join(b'cache/%s' % fname)
-    dstbranchcache = os.path.join(dstcachedir, fname)
-    if os.path.exists(srcbranchcache):
+    srcfname = srcrepo.cachevfs.join(fname)
+    dstfname = os.path.join(dstcachedir, fname)
+    if os.path.exists(srcfname):
         if not os.path.exists(dstcachedir):
             os.mkdir(dstcachedir)
-        util.copyfile(srcbranchcache, dstbranchcache)
+        util.copyfile(srcfname, dstfname)
 
 
 def clone(