[Bug 796534] Wrapped subproject gl-headers breaks Continuous

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796534

--- Comment #6 from Emmanuele Bassi (:ebassi) <ebassi at gmail.com> ---
(In reply to Nirbheek Chauhan from comment #4)

> > By the time we invoke Meson, we're already inside a sandbox, because the
> > version of Meson we use is part of that sandbox.
> 
> What part of Continuous does the git submodule update?

The same that runs `git pull`; if `git submodule status` returns a list of
modules, it'll run `git submodule update` on any sub-module.

This is similar to how flatpak-builder works.

> Why can't that also
> run `meson wrap --download-all` or whatever?

Unlike Git, Meson is not installed on the host OS.

Again, building modules in a sandbox assumes you only have the tool necessary
to check out the source code installed on your host; anything else, from the
compiler toolchain to the build system itself, is part of the SDK inside the
sandbox.

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