zip packages dependencies

[amitu]

A package can mount zip package created from the itself or another package on any url. The URL would be passed as base-url so all links would work.

-- import: ftd
-- fpm.package: some-package

-- fpm.dependency: some-package#foo
mount-point: /internal-foo/

Let's assume that some-package is the package which contains the foo.ftd and bar.ftd mentioned in export zip discussion.

Here we are using some-package#foo, meaning we want to use the fpm package to come from the generated zip. By default it would be mounted on /-/foo since all dependencies go to /-/<dependency-name>. If there is a conflict, more than one dependency have the same hash, then its a configuration error. And hello.py will be served on /-/foo/hello.py.

Since we have further specified the mount point, hello.py would be served on /internal-foo/hello.py.

Note: in the example here, the package is invalid, since it does not have FPM.ftd. We will either relax this, and FPM.ftd would become optional or we will check and this feature can only be used if the zip file is a valid fpm package and contains FPM.ftd.