This adds a step to the build process to bundle
the module sources, used for building the flatpak,
as a runtime extension.
The sources can then be installed like the
debug or translation runtime.
This also adds an option to flatpak-builder
for specifying sources directories. One can specify
source dirctories with the use-sources argument. This
will skip the download part of the processing
and will extract the sources from the given sources
directory directly for further processing.
Those source directories do need the same
structure as the ones that flatpak-builder
creates during processing in .flatpak-builder
and which is also used in the exported sources
runtime.
If the target is the rofiles-fuse and a file is hardlinked, then
copy will fall back to truncation, which will fail with READONLY.
We work around this sometimes by deleting the destination first
and sometimes by using g_file_set_contents instead.
This way you can e.g. do network i/o in them.
Thats not a recommended way to do it though, as you work around
a lot of the feature in flatpak-builder like the caching and
verification.
Simon Schampijer