devtool: sdk-update: improve SDK update process robustness
Make the following improvements to the SDK update process:
* Use a manifest file with sha256sums to track files other than sstate
and metadata that we need to update - e.g. conf files. This allows us
to handle where files such as auto.conf may or may not be present,
as well as the configuration changing without affecting task signatures
- we still want the config files copied in that case rather than it
saying nothing needs to be done.
* Write the SSTATE_MIRRORS_append to site.conf rather than local.conf
so that local.conf remains static (since we don't want to trigger an
update every time). Also, If there is an SSTATE_MIRRORS value already
set in the configuration we can skip this and assume it contains the
needed packages.
* Allow the update process to be run in any directory, don't assume
we're already at the base of the SDK
* Where practical, fetch remote files into a temporary location and
then move them to the desired location at the end, to avoid a
failed update leaving the SDK in a broken state.
* Update all installed do_populate_sysroot / do_packagedata tasks
instead of using the SDK targets. This ensures any item installed
through dependencies after installation (e.g. when running
"devtool build") won't go stale.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
