Shawn O. Pearce wrote:
quoted text
> Brandon Casey <casey@nrlssc.navy.mil> wrote:

quoted text
>> The docs (git-repack.txt) seem to suggest that git-repack (without -d) 
>> does not delete any objects. And if -d is used, then at most objects 
>> already referenced in other packs will be deleted. This makes me think 
>> that repack is safe on the source repository.
> 
> You are correct that leaving off the '-d' won't delete objects.
> But a pack is created by listing the objects we need, and if we don't
> need the object in source, we don't include it into the new pack.
> 
> -a -d implies delete all packs that existed when we started the
> repack.  So if an object was in the old packfile, and we didn't
> copy it to the new packfile, it gets deleted.  ;-)

Ok. There is the connection I did not make. repack -d is NOT harmless, 
since a pack that contains only objects referenced in other packs and 
dangling unreferenced objects, will be deleted. Which will be all of the 
preexisting packs in the case of git-gc since as you mentioned it 
repacks using -a -d -l.

Thanks for taking the time.

-brandon

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