[Matthias Schiffer: minor script improvements]

Fixes: 071cf7b2 ("Switch to Lua for target definitions")

This displays the branch, repo and commitID that was attempted to update to but
failed. Users then can compare this output to the configuration they meant to
activate in modules and hopefully better find their typos.

This is now much nicer to luacheck.

This new build flag is mandatory for now (it may default to 0 in a future
Gluon version). It may be set to the following values:

* 0 - Do not build any images for deprecated devices.
* upgrade - Only build sysupgrade images for deprecated devices.
* full - Build both sysupgrade and factory images for deprecated devices.

"Other" images are handled like factory images, as they are also used for
the initial installation of Gluon on a device.

The old bash-based parsing code was way too complex. Replace it with Lua.

Fixes need_one_of() with boolean elements.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

This package allows to automatically switch to another domain, either
at a given point in time or after the node was offline long enough.

This commit allows for binary content in patches created via 'make
update-patches'.

Binary patches are needed for BDFs required for al boards on the new
ipq40xx target. Before this commit, binaries were omitted from the
generated patch which resulted in the patch not able to apply.

Patches without binary content do not differ in case they are created
with the '--binary' flag.

The new extra_image command allows to copy additional images that don't
fall into the sysupgrade or factory categories to the output directory.
These images will be placed in the "other" subdirectory.

The extra_image command takes 3 arguments: in_suffix (suffix in OpenWrt
bin directory), out_suffix (suffix in Gluon output directory) and ext (file
extension). Example:

  extra_image '-tftp' '-tftp' '.bin'

The ext argument can be omitted to control the whole filename suffix
including the extension from in_suffix and out_suffix. Multiple extra_image
commands can be used for a single device; aliases work as usual.

Based-on-patch-by: David Bauer <mail@david-bauer.net>

modules.sh can't depend on openwrt/feeds.conf.default, otherwise the
initial update will fail.

Using slashs instead of dots is a bit unexpected, and as long as we're not
going for full-blown JSONPath, neither is more correct than the other.

Based-on-patch-by: lemoer <git@irrelefant.net>

Each domain is validated separately, preferring domain values to site
values.

Based-on-patch-by: lemoer <git@irrelefant.net>

This does not do anything yet, as this_domain() is not implemented yet.

Based-on-patch-by: lemoer <git@irrelefant.net>

scripts/filesize.sh doesn't follow symlinks.

Fixes #1316

In addition to significant internal differences in check_site_lib.lua (in
particular unifying error handling to a single place for the upcoming
multi-domain support), this changes the way fields are addressed in site
check scripts: rather than providing a string like 'next_node.ip6', the
path is passed as an array {'next_node', 'ip6'}.

Other changes in site check scripts:
* need_array and need_table now pass the full path to the sub fields to the
subcheck instead of the key and value
* Any check referring to a field inside a table implies that all higher
levels must be tables if they exist: a check for {'next_node', 'ip6'} adds
an implicit (optional) check for {'next_node'}, which allows to remove many
explicit checks for such tables

The domain configs are not checked yet, and not used for anything.

Based-on-patch-by: lemoer <git@irrelefant.net>

These helpers are no-ops for now, until the actual multi-domain support is
added.

We would like to check the file size instead of downloading indefinitely.
The file size is added in another copy of the manifest lines, which is
ignored by older autoupdater implementations.

Fixes #1262

LEDE doesn't always notice that the metadata needs to be refreshed.