largefiles: reuse "findcommonoutgoing()" result at "hg push"

Before this patch, "hg push" invokes "findcommonoutgoing()" not only
in "exchange.push()" but also in "lfilesrepo.push()", when largefiles
is enabled. The latter is redundant.

This patch registers own "prepushoutgoinghook" function into
"prepushoutgoinghooks" of "localrepository" to reuse
"findcommonoutgoing()" result.

"prepushoutgoinghook" omits "changelog.nodesbetween()" invocation,
because "findcommonoutgoing()" invocation in "exchange.push()" takes
"onlyheads" argument and it considers "nodesbetween()".

hgext/largefiles/reposetup.py

@@ -10,7 +10,7 b''
 import copy
 import os
 
-from mercurial import error, manifest, match as match_, util, discovery
+from mercurial import error, manifest, match as match_, util
 from mercurial.i18n import _
 from mercurial import localrepo
 
@@ -412,15 +412,6 b' def reposetup(ui, repo):'
                             " supported in the destination:"
                             " %s") % (', '.join(sorted(missing)))
                     raise util.Abort(msg)
-
-            outgoing = discovery.findcommonoutgoing(repo, remote.peer(),
-                                                    force=force)
-            if outgoing.missing:
-                toupload = set()
-                o = self.changelog.nodesbetween(outgoing.missing, revs)[0]
-                addfunc = lambda fn, lfhash: toupload.add(lfhash)
-                lfutil.getlfilestoupload(self, o, addfunc)
-                lfcommands.uploadlfiles(ui, self, remote, toupload)
             return super(lfilesrepo, self).push(remote, force=force, revs=revs,
                 newbranch=newbranch)
 
@@ -480,6 +471,14 b' def reposetup(ui, repo):'
 
     repo.__class__ = lfilesrepo
 
+    def prepushoutgoinghook(local, remote, outgoing):
+        if outgoing.missing:
+            toupload = set()
+            addfunc = lambda fn, lfhash: toupload.add(lfhash)
+            lfutil.getlfilestoupload(local, outgoing.missing, addfunc)
+            lfcommands.uploadlfiles(ui, local, remote, toupload)
+    repo.prepushoutgoinghooks.add("largefiles", prepushoutgoinghook)
+
     def checkrequireslfiles(ui, repo, **kwargs):
         if 'largefiles' not in repo.requirements and util.any(
                 lfutil.shortname+'/' in f[0] for f in repo.store.datafiles()):

tests/test-largefiles.t

@@ -1593,7 +1593,6 b' largefiles can be pushed locally (issue3'
   $ hg push ../dest
   pushing to ../dest
   searching for changes
-  searching for changes
   adding changesets
   adding manifests
   adding file changes
@@ -1687,7 +1686,6 b' Push of file that exists on server but i'
   $ hg push -R r7 http://localhost:$HGPORT1
   pushing to http://localhost:$HGPORT1/
   searching for changes
-  searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
@@ -1711,7 +1709,6 b' Push a largefiles repository to a served'
   $ hg push -R r8 http://localhost:$HGPORT2/#default
   pushing to http://localhost:$HGPORT2/
   searching for changes
-  searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes