context: use "vfs.lstat()" instead of "os.lstat()"

This patch also changes paths added to "rejected" list from full path
(referred by "p") to relative one (referred by "f"), when type of
target path is neither file nor symlink.

This change should be reasonable, because the path added to "rejected"
list is relative one, when "OSError" is raised at "lstat()".

mercurial/context.py

@@ -1111,11 +1111,11 b' class workingctx(committablectx):'
         ui, ds = self._repo.ui, self._repo.dirstate
         try:
             rejected = []
+            lstat = self._repo.wvfs.lstat
             for f in list:
                 scmutil.checkportable(ui, join(f))
-                p = self._repo.wjoin(f)
                 try:
-                    st = os.lstat(p)
+                    st = lstat(f)
                 except OSError:
                     ui.warn(_("%s does not exist!\n") % join(f))
                     rejected.append(f)
@@ -1129,7 +1129,7 b' class workingctx(committablectx):'
                 if not (stat.S_ISREG(st.st_mode) or stat.S_ISLNK(st.st_mode)):
                     ui.warn(_("%s not added: only files and symlinks "
                               "supported currently\n") % join(f))
-                    rejected.append(p)
+                    rejected.append(f)
                 elif ds[f] in 'amn':
                     ui.warn(_("%s already tracked!\n") % join(f))
                 elif ds[f] == 'r':

mercurial/scmutil.py

@@ -254,6 +254,9 b' class abstractvfs(object):'
     def islink(self, path=None):
         return os.path.islink(self.join(path))
 
+    def lstat(self, path=None):
+        return os.lstat(self.join(path))
+
     def makedir(self, path=None, notindexed=True):
         return util.makedir(self.join(path), notindexed)