[darcs-users] revision identifiers

[Declan Naughton]

On Fri, Mar 28, 2008 at 6:48 PM, Declan Naughton
<piratepenguin at gmail.com> wrote:
> On Fri, Mar 28, 2008 at 5:58 PM, David Roundy <droundy at darcs.net> wrote:
>  > On Fri, Mar 28, 2008 at 05:26:27PM +0100, Declan Naughton wrote:
>  >  > Why can't checksumming the context produce a suitable identifier, I
>  >  > must ask? What are the uses in it being "universally unique" that we
>  >  > would miss out on, anyhow? We can still seek through the repository
>  >  > history and get specific revisions?
>  >
>  >  The checksum of a context wouldn't allow us to determine what context it
>  >  describes, since the number of possible contexts we'd need to try goes as
>  >  N!, where N is the number of patches in the repository.  I think that'd be
>  >  a bit too expensive.  Best to just include the entire context.
>  >
>
>  We don't need to generate a sum for every possible context, just one
>  sum for the actual context at every point in time (every time a record
>  takes place).
>
>  --
>  Declan Naughton
>

Wait. What I mean is to associate the sum with the context, in the
repo, and it will know the context that the sum identifies.

(and it would not be a good plan to save a context per record, but to
simply mark the points in the history with the identifier, and the
context can be generated from that. And if the history is
restructured, then we can cater for that too without too much bother,
I think)

-- 
Declan Naughton