Complex store queries

Casey Marshall casey.marshall at
Tue Oct 25 20:21:05 UTC 2016

On Mon, Oct 24, 2016 at 6:15 AM, Merlijn Sebrechts <
merlijn.sebrechts at> wrote:

> +1 for "which charms use this layer" queries. This has a number of uses:
> - for finding what the quality of a layer is (more use in recommended
> charms = better quality)
> - for the maintainer of a layer so he can see what the impact is of a
> change on his layer
> - to see which charms have to be rebuilt if a vulnerability has been found
> in a layer

Related to that last use case, it's also possible that a security update
needs to be applied based on the software that gets installed by the layer.

Today I noticed a security update for nginx:

This affects all deployed applications that were built with layer:nginx.
You'll definitely want to `juju run "apt-get update && apt-get upgrade -y
nginx"` on those.

> 2016-10-18 16:55 GMT+02:00 Ondřej Kuzník <ondrej.kuznik at>:
>> Hi,
>> developing new charms or just exploring the store, one might want to
>> raise random queries like "which charms use a layer x", "which charms
>> are subordinate" and some others. Are there any plans to add those,
>> concerns why this might not be a good idea?
>> While the store could extend the API to include these, I presume it
>> would just be an addition to a hardcoded list. Another option would be
>> for someone to scrape the store to PostgreSQL or a document DB of some
>> sort that could be searched with rather arbitrary queries (and a few
>> indexes for the more common ones).
>> My first reaction is that such a scraper would be frowned upon as it
>> might not have a way to update its database intelligently and keep
>> hitting all sorts of rate limits imposed by the store, but I might be
>> wrong here.
>> Any thoughts on this?
>> Thanks,
>> Ondrej
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