share: move the implementation of 'unshare' to the 'hg' module

share: move the implementation of 'unshare' to the 'hg' module

This will be used to setup unsharing subrepos.  Usually cmdutil is used for
this purpose.  But the implementation needs hg.copystore(), and the hg module
already imports cmdutil.

--- a/hgext/share.py	Tue Oct 17 20:25:43 2017 +0200
+++ b/hgext/share.py	Tue Oct 17 21:48:56 2017 -0400
@@ -114,28 +114,7 @@
     if not repo.shared():
         raise error.Abort(_("this is not a shared repo"))
 
-    destlock = lock = None
-    lock = repo.lock()
-    try:
-        # we use locks here because if we race with commit, we
-        # can end up with extra data in the cloned revlogs that's
-        # not pointed to by changesets, thus causing verify to
-        # fail
-
-        destlock = hg.copystore(ui, repo, repo.path)
-
-        sharefile = repo.vfs.join('sharedpath')
-        util.rename(sharefile, sharefile + '.old')
-
-        repo.requirements.discard('shared')
-        repo.requirements.discard('relshared')
-        repo._writerequirements()
-    finally:
-        destlock and destlock.release()
-        lock and lock.release()
-
-    # update store, spath, svfs and sjoin of repo
-    repo.unfiltered().__init__(repo.baseui, repo.root)
+    hg.unshare(ui, repo)
 
 # Wrap clone command to pass auto share options.
 def clone(orig, ui, source, *args, **opts):

--- a/mercurial/hg.py	Tue Oct 17 20:25:43 2017 +0200
+++ b/mercurial/hg.py	Tue Oct 17 21:48:56 2017 -0400
@@ -257,6 +257,35 @@
     _postshareupdate(r, update, checkout=checkout)
     return r
 
+def unshare(ui, repo):
+    """convert a shared repository to a normal one
+
+    Copy the store data to the repo and remove the sharedpath data.
+    """
+
+    destlock = lock = None
+    lock = repo.lock()
+    try:
+        # we use locks here because if we race with commit, we
+        # can end up with extra data in the cloned revlogs that's
+        # not pointed to by changesets, thus causing verify to
+        # fail
+
+        destlock = copystore(ui, repo, repo.path)
+
+        sharefile = repo.vfs.join('sharedpath')
+        util.rename(sharefile, sharefile + '.old')
+
+        repo.requirements.discard('shared')
+        repo.requirements.discard('relshared')
+        repo._writerequirements()
+    finally:
+        destlock and destlock.release()
+        lock and lock.release()
+
+    # update store, spath, svfs and sjoin of repo
+    repo.unfiltered().__init__(repo.baseui, repo.root)
+
 def postshare(sourcerepo, destrepo, bookmarks=True, defaultpath=None):
     """Called after a new shared repo is created.