Re: Update mechanism for standalone app/ Delta Updates

On 22 February 2017 at 08:35, Bastian Eicher <[email protected]> wrote:
[...]
> Zero Install also has the concept of “recipes” that allow implementations to
> combine multiple archives or other steps like renames or removals. For
> example:
>
> <implementation version="1" id="sha256=abc">
>   <archive href=".../myapp-v1.zip"/>
> </implementation>
>
> <implementation version="2" id="sha256=xyz">
>   <recipe>
>     <archive href=".../myapp-v1.zip"/>
>     <archive href=".../myapp-v2-delta.zip"/>
>   </recipe>
> </implementation>
>
> However, this would only save you from having to upload large updates. When
> downloading v2 Zero Install would still need to re-download v1 as well
> because it does not know that the existing sha256=abc implementation
> corresponds to the myapp-v1.zip archive recipe step.
>
> @Thomas: Perhaps we could introduce a new recipe step to handle this, for
> example:
>
> <recipe>
>   <implementation id="sha256=abc"/>
>   <archive href=".../myapp-v2-delta.zip"/>
> </recipe>
>
> What do you think?

I think that's exactly the right way to do it. I can't remember if we
agreed a syntax (gmane still isn't fully back up so the link on the
roadmap page is broken). Possibly we shouldn't create any more
elements called <implementation>, to avoid confusion. Maybe something
like this:

<recipe>
  <copy-from sha256='...'/>
  <archive href=".../myapp-v2-delta.zip"/>
</recipe>

I'm not finding I have a lot of free time these days, but if someone
wants to try it shouldn't be much work. Older versions of 0install
will automatically skip <recipe>s with unknown elements.


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