This really simplifies debugging, if a package is not found or a feed is
not reachable, a proper stderr is printed. Currently it would only say
`_call_manifest` failed.

Signed-off-by: Paul Spooren <mail@aparcar.org>

Tested with 18.06.0-rc2/ar71xx/generic/tl-wdr4300-v1, image & list

This PR is based on the work of @fewckert[1] with slight improvements.

Add function `manifest` to show the manifest of the produced image,
before actually building it. The manifest contains an orderd list of
package name and version.

This is usefull to check package dependencies but also determine a
unique and reproducible image name before building the package. The
sysupgrade server[2] builds images on request with individual package
selection. To distignish between created images which contain differnt
packages, the EXTRA_IMAGE_NAME is set to a shortend hash of the
manifest's content. So far the image was renamed afterwards as the
manifests content was unknown, however this corrupts the signed
sha256sums. This patch allows a clean solution as to dtermine the
manifest in advance and set the EXTRA_IMAGE_NAME accordingly.

[1]: https://github.com/lede-project/source/pull/1591
[2]: https://github.com/aparcar/attendedsysupgrade-server

Signed-off-by: Paul Spooren <mail@aparcar.org>

In addition to removing redundant code, this fixes various issues in
IB-generated images that have been fixed in prepare_rootfs before,
including better handling of CONFIG_CLEAN_IPKG and enabling of initscripts
from FILES.

We also reuse the opkg macro and remove --force-... flags that have been
removed from rootfs.mk as well.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

No longer rewrite opkg list output in package_list function, remove
the awk call in the pipe (which was intended for a single specific
use-case).

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

commit 19ac879954 (imagebuilder: add package_list function) introduced
a new function 'package_list' to the imagebuilder Makefile.
Unfortunately the package list was poluted by stdout noise of the
Makefile itself as well as opkg. Redirect those outputs to stderr to
make sure that the package_list returned doesn't contain progress
info output but really only packages.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

The imagebuilder can now list all available packages by using make
package_list. This is usefull for scripts to retrieve a list of all
packages with versions (and size)

Signed-off-by: Paul Spooren <paul@spooren.de>
[daniel@makrotopia.org: fixed commit message]

Defined required host related variables in toplevel.mk instead

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Use silent make invocations for sub-makes like build_image or checksum to
avoid bloating the IB output with non-status info.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

The name "Plat'Home OpenBlocks AX3" causes the imagebuilders "make info"
command to fail with:

    bash: -c: line 0: syntax error near unexpected token `('
    bash: -c: line 0: `echo;  [...]'
    Makefile:99: recipe for target '_call_info' failed

Properly escape single quotes to avoid breaking the echo commands.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

Add a new "checksum" make target which generates an sha256sums file over the
image files produced in bin/targets/ and automatically call it during make
world after the package index generation.

The advantage of this new target is that it is guaranteed to run after the
images, the SDK and the ImageBuilder archives have been generated to ensure
that they all end up in the checksum file. Fixes FS#51.

Uses sed to postprocess the OpenSSL digest output into an sha256sum command
compatible format.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>