Re: [BuildStream] Plans for workspaces and incremental builds

[Darius Makovsky <darius makovsky codethink co uk>]

On 02/10/2019 13:43, William Salmon via buildstream-list wrote:
> [...]
>
> Could we remove some of the friction hear? I would like to be able to 
> create a workspace from a failed build if I have cached buildtrees 
> enabled.

I would expect that is possible but would require a bit of work. In theory I
don't see why we can't do that.

> Also can the final build with out a workspace realize that it 
> is the same as the already build workspace?

That would be more difficult than the above. Again, *in theory* that is
possible but essentially that would mean trying to save the workspace config
for recovery in a non-workspaced state and then remapping a build tree to a
new ref since the workspaced source ref is not going to be the same as the
non-workspaced source ref.

> [...]
> When calculating the diffs don't forget that there might not be any 
> change to the source it might only be the bst file that changed. And 
> don't forget to handle soft reset properly/better.

If you have changed the bst then is it still the same workspace?

Also, I'm not even sure of the purpose/necessity of soft reset in the current
implementation.

-- 
Best Regards,
Darius


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