localrepo: use the vfs join method to implement the localrepo join method This will make it possible to customize the behavior of the join method by changing the vfs class (e.g. by using the altvfs" class introduced recently). Note that we could have modified the VFS join methods to acept a set of optional paths in the same way thta the localrepo join method does. However it seemed simpler to simply call os.path.join before calling self.vfs.join.

localrepo: introduce shared method to check if a repository is shared Up until now we compared the "path" and "sharedpath" repository properties to check if a repository is shared. This was relying an implementation detail of shared repositories. In order to make it possible to change the way shared repositories are implemented, we encapsulate this check into its own localrepo method, called shared. This new method returns None if the repository is shared, and something else (for now a string describing the short of share) otherwise. The reason why I did not call this method "isshared" and made it return a boolean is that I plan to introduce a new type of shared repository soon. # NOTES: This is the first patch in a series whose purpose is to add support for creating "full repository shares", which are repositories that share everything with the repository source except their current revision, branch and bookmark. This series is RFC because I am not very sure of some of the solutions I took. Comments are welcome!

trydiff: use 'ctx1.flags()' for symmetry with 'ctx2.flags()'

trydiff: use 'not in addedset' for symmetry with 'not in removedset' With the previous change in place, we can safely use 'addedset'.