[darwinbuild] proposed binary_sites change

[Shantonu Sen]

On Aug 31, 2005, at 4:43 PM, Kevin Van Vechten wrote:

> I'd like to modify DarwinBuild's behavior for downloading binaries  
> to better support custom plists, and alleviate a lot of the server- 
> side work that's needed to support roots downloads.
>
> In the current scheme, each release needs to have all roots  
> available in one HTTP directory (we use symlinks on the server  
> side).  A better approach would be to use a search path when  
> downloading roots.  This would allow people providing custom plists  
> to only host the roots which they've actually modified.

Cool, this sounds good.

> This scheme should work as long as all inherited builds are ABI  
> compatible.  This is certainly true of Apple's software update  
> releases, though it would probably be best to never inherit across  
> major releases (i.e. 8A48 inheriting from 7W98).  Luckily major  
> releases usually have enough differences that it wouldn't make  
> sense to inherit in those cases anyway.
>
> I believe this would eliminate the most common cases for using the  
> "-depsbuild" argument.

Yes, because you essentially end up putting all the inheritance tree  
on the command-line in the form of depsbuild arguments... In fact we  
should remove -depsbuild, since it's not clear where those builds  
would end up in priority after you've evaluated the inheritance chain  
based on the database.

> After this change is made, we can maintain compatibility with older  
> darwinbuilds by adding server-side symlinks like "8C46 -> ."

Oh, you mean older darwinbuilds using the new plists, so they would  
request http://darwinsource.opendarwin.org/Roots/8C46/8C46/ 
bash.root.tar.gz and get the right thing. Cool.

We may want to start putting darwinbuild compatibility versions in  
the plist, to indicate the minimum darwinbuild/darwinxref you need to  
import a plist. The sooner we do this, the easier a transition will  
be in the future (and the lesser support burden)

Shantonu
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