[Bug 1778256] Re: [Pull request] Move apt-btrfs-snapshot to daily systemd timers, drop python2 and other changes

[Mikhail N]

https://gitlab.com/nixtux-packaging/apt-btrfs-
snapshot/commit/29e2864ac59e9a73f4f7359da404bb83127d5139 fixed it on
Ubuntu 16.04. python3-dist-utils on 18.04 and python3-dist-utils-extra
are required. Without them it may just not work or report that the
system is lacking snapshot features. This fixed 'system is lacking
snapshot features' error on my Ubuntu 16.04 servers and desktops

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Title:
  [Pull request] Move apt-btrfs-snapshot to daily systemd timers, drop
  python2 and other changes

Status in apt-btrfs-snapshot package in Ubuntu:
  New

Bug description:
  Hello,
  I have created a fork of apt-btrfs-snapshot for my own usage and want to propose these changes for upstream.

  The code is here: https://gitlab.com/mikhailnov/apt-btrfs-snapshot
  Please have a look at it. Unfortunately, I have not understood how to
  send a pull request at Launchpad.

  Changes compared to the upstream version 3.5.1:

  * Systemd daily timer instead of weekly cron to clean old snapshots
  * Do not run the timer when on battery (with no AC power)
  * Force btrfs sync after snapshot deletions
  * Introduce etc/apt-btrfs-snapshot.conf.d/ directory for config files which are loaded in alpha-numerical order
  * /etc/apt-btrfs-snapshot.conf.d/10-default.conf is the default config, but other packages may put other configs into the config directory (for example, I want to override MaxAge on a group of machines and package my own config file /etc/apt-btrfs-snapshot.conf.d/20-my.conf); I will probably add such config to [system-autoupdate](https://gitlab.com/mikhailnov/system-autoupdate)
  * Default MaxAge to 15 days (2 weeks + 1 day) instead of 90 days to reduce problems with no empty space left on disk
  * Drop support for building with python2

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