Re: Remove diff machinery dependency from read-cache

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Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:

> On Thu, 21 Jan 2010, Linus Torvalds wrote:
>> 
>> We could fix it a few ways
>> 
>>  - ignore it. Most git programs will get the pack handling functions 
>>    anyway, since they want to get object reading.
>
> In fact, we should probably remove git-show-index. It may have some 
> historical significance as a pack-file index debugger, but it has no 
> actual redeeming features now, considering that the binary is a megabyte 
> of useless crud with debugging info.
>
> However, we do actually use it in t/t5302-pack-index.sh. So in the 
> meantime, how about this hacky patch to simply just avoid xmalloc, and 
> separating out the trivial hex functions into "hex.o".
>
> This results in
>
>   [torvalds@nehalem git]$ size git-show-index 
>        text    data     bss     dec     hex filename
>      222818    2276  112688  337782   52776 git-show-index (before)
>        5696     624    1264    7584    1da0 git-show-index (after)
>
> which is a whole lot better, no?
>
> (Or make it a built-in, if we actually think we want to carry it along in 
> the long run)

We tend to not remove things unless we are absolutely certain nobody uses
it, so probably making it built-in would be preferrable.  I don't think
show-index is used very often if ever, but scripts that use hash-object
would use it really often and would do so via its --stdin interface if it
knows that it is creating more than a dozen objects, so start-up time
required to map the whole git is probably not an issue.

By the way, do you think anybody still uses "git merge-trees"?

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