svn-cur

[Chris Rees]

On 27 December 2011 12:37, Julian H. Stacey <jhs at berklix.com> wrote:
> Hi Stephen
>> On 12/26/2011 07:55 PM, Julian H. Stacey wrote:
>> >> Suggestion:
>> >> Maybe you might want a 5 digit numeric, not 4 digit, like cvs-cur ?
>> >> (as eg there's often more cvs deltas than other deltas)
>> >
>> > Suggestion:
>> > Also use same convention as before in naming with xEmpty to indicate a base
>> > ctm (delta) rather than just a differential ctm (delta).
>> >     mv svn-cur.0001.xz svn-cur.00001xEmpty.xz
>> >     mv svn-cur.0002.xz svn-cur.00002.xz
>>
>> The convention that svn-cur.0001 does not have xEmpty in it is a
>> convention that has been followed before.  Look at src-9.  It is how the
>> mkCTM software works.
>
> OK, thanks, I had wondered if it was a mistake.
> I hadn't noticed the example of src-9 till now.
>
> The name 'Empty' was a useful marker to distinguish & seperate a
> full from a differential file....  We're now up to src-9.0077.gz
>
> Question:
> Might there may be trouble when we get to src-9.0100.gz ?
> A double bid for that file name:
> - Recipient hosts will want a normal small incremental update.
> - Sender & ftp mirror servers, that same name needs to hold
>  2 different sets of content,
>  - for a differential.
>  - for a complete archive
> How will ctm recipients later distinguish which CTM delta to pull via ftp
> if they both have the same name ? eg
>        src-9.0300.gz   a complete base CTM archive for later starters
>        src-9.0300.gz   a differential delta for those ftp'ing after
>                        maybe a mail outage on recipient loses an odd delta.
> Using same name in different new directories might also be problematic, as
> if we had eg
>        /pub/FreeBSD/development/CTM/src-cur/src-9.0101.gz
>        /pub/FreeBSD/development/CTM/src-cur/empty-new-dir/src-9.0101.gz
> all mirror site would need to create directories called /empty-new-dir/
> which might (I don't know) require permission/manual intervention on mirrors).
>
> The scenario I guess hasn't happened before, & doesn't matter when a new
> archive first starts, as per src-9.0001.gz,
> but I guess this potential problem approaches as src-9.0077.gz
> approaches src-9.0100.gz or src-9.0101.gz ?
>

Stephen is pointing out that src-9.0001 is not an incremental delta;
there's no src-9.0000.

Yes, when it gets to src-9.0100 there'll be an Empty file here, but
since there's no difference between 0001 and 0001Empty, there's no
point in having both files there.

Chris