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In reality we need to download files from repo.turris.cz so it makes
sense to try perform real download rather than just ping.

This also changes when we check for network. We check every time that is
enabled. It makes sense as that way we can cover some temporally service
dropouts even when not running from cron.

There are other tiny tweaks such as that we no longer use name of
package in package itself and rather import relatively.

Fixed
* `packages` module failure when there is uninstalled package in index

Updater preserves removed packages in index if they at time of removal
had some modified configuration files. Such packages are removed and
should be reported as such. There is also no control file on filesystem.

This fixes missing control file error by just not reading control file
if it is not present. This has no impact as info is not available about
that package and should not be required anyway.

This also fixes installed method by properly checking status fields.

Fixed
* Missing defaults for `--rand-sleep` and `--wait-for-network` arguments
* Deprecated usage of `collections

This is simple issue. We use it as int but if argument is not used the
default is None. We are missing defaults in parser.

* Merged changes from 1.3.3 fixup release

Updater Supervisor version 1.3.3

Fixed
* exception raised when "approvals needed" was configured there was
  pending approval

Fixed
* exception raised when "approvals needed" was configured there was
  pending approval

The autorun.auto_approve_time() returns None in case of approvals are
required. Instead of checking if it is not None we checked old condition
and that if it is larger than 0.

This was casing update blockage in case approvals were configured as
required.

Added
* msgtrace module with ability to provide info such as date of last
  check for updates or updater execution messages
* packages module that allows read access of installed packages info
* Option --no-network-fail to skip updater run when network connection
  is unavailable
* Possibility to disable network test by setting zero
* System shutdown is now retained till there is process holding opkg
  lock
* argument --autorun to mark execution as automatic run to adhere
  autorun configuration

Changed
* Disabled autorun now won't prevent from update, you have to use
  --autorun to get previous behavior

This removes some left over Python 2 compatibility code. It also makes
sure that public modules do not "unpack" any modules. That is 'from foo
import fee` is pretty much not used in public modules.

This now has to use --autorun as it is running it automatically and also
it is good to use --no-network-fail.

The original idea was to use autorun configuration to disable automatic
updates. As it was implemented until now it was preventing execution of
updates not just automatic but manual as well. The only option was to
use pkgupdate directly. This should allow usage of supervisor not just
when automatic updates are enabled.

This module parses status file and control files of packages installed
in system. In allows access to various fields.
Primary usage is to check if given package is installed (that covers not
just exactly name of package but also all packages providing it).

This module is intended as "hack" to allow some state reporting of
updater to other components. It is really hack as it relies on debug
messages send to syslog.
This implementation does not match every single message produced by
updater. It only covers standard execution messages and only those with
some sort of "benefit" to user.

This adds type hints on all public functions and methods.

This option should be used for example from cron to not spam pkgupdate
when we know it is going to fail. It also prevents from spamming users
because of failed update executions.

This protects against reboots breaking system if they happen in
inappropriate time during update. It is not ultimate solution as user
can simply unplug router but it helps in some cases.

Although mode should be always set it can be removed by user. We should
not just fail with exception when we know that branch is the default
mode. That means instead just fallback to branch.

Changed
* pkgupdate is now not run with `--task-log`

This removes task log. I was used as kind of history of changes but was
primarilly to observe long term execution. There are issues with it as
that we do not manage that log correctly (it is not logrotated). It is
also questionable how usable it is. One execution can be and is parsed
from state-log. This makes this file almost without use and not needed
for functionality at all. In the end making it adept for removal.

Added
- Support for package lists filter based on board
- New dependency is now distro

This is filter for both package lists as well its options to skip them
if they are not compatible with current board. This is primarily
intended to support hardware specific extension in package lists.

No change is required outside of updater-supervisor as package lists are
just skipped and considered as not defined (not existing).

Labels are new generic approach to existing official boolean option.
This removes that option and instead introduces flags that can symbol
anything.

This implementation is just extension of existing one so everything is
till returned all at once. Labels can be matched by name between various
pkglists but that has to be done by user. Here info for labels is
duplicated to every occurrence of that label.

Don't rely on type autodetection

Hidden flag is rarely used so False should be safe default.

Generate correct title and description of pkglist options.

Also polish exceptions

This uses environment variable ROOT_DIR provided by pkgupdater.