Get revisions affecting a file?

[John Arbash Meinel]

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Michael Gliwinski wrote:
> On Tuesday 01 December 2009 15:56:45 John Arbash Meinel wrote:
>>> wt = WorkingTree.open_containing('.')[0]
>> wt.lock_read()
>> basis = wt.basis_tree()
>> basis.lock_read()
>> file_id = wt.path2id(filename)
>> basis_ie = basis.inventory[file_id]
>> file_key = (file_id, basis_ie.revision)
>> texts = wt.branch.repository.texts
>>
>> # loop over this
>> texts.get_parent_map([file_key])
>>
>> This will give you the revisions that actually modified the file, but
>> not revisions that merged those changes (which log includes).
> 
> Thanks for the tip John, that seems easier indeed.  I'll have to ask some 
> followup questions as I'm only starting to dig into bzrlib and some things 
> aren't clear to me yet.
> 
> So basically texts.get_parent_map returns a map of specified file_keys to a 
> tuple of tuples, each of which represents what exactly? And how are they 
> ordered?
> 
> Specifically I'll want to use that to obtain the most recent revision where 
> that file was modified and it's date.  Would that be the first tuple?  Or are 
> they unordered?

basis_ie.revision is the last modification of a file (provided it isn't
modified on disk).

You can use:

rev = wt.repository.get_revision(basis_ie.revision)

To turn that revision-id into a Revision object which has
"self.timestamp" as the seconds-since-epoch when the file was committed.


> 
> Also, maybe I'm getting confused here, but how are revisions represented in 
> the code, are they tuples?  Some places also refer to Revision objects, how 
> can these be obtained?
> 
> Feel free to give me a pointer to somewhere in the code where this is used, 
> I'll read through it and figure out as much as I can :)  Also, I may be 
> missing something fundamental, I admit I didn't have time to read through all 
> developer docs just yet, so I apologise, I'm getting there though.
> 
> 

A revision_id is a simple string that implies a revision. You can use
"repo.get_revision(revision_id)" to get the Revision object described.
You can also use the revision id to get the inventory (tree-shape
information), and other such objects.

John
=:->
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