[Bug 1718444] [NEW] systemd-sysctl in Xenial is not obeying the order of the sysctls

[Philipp Kern]

Public bug reported:

systemd-sysctl in Xenial forces itself over procps by shipping a link
for procps.service to systemd-sysctl.service. However, it does not obey
the order both of the files and also of the sysctls within the files.
Instead it uses a simple hashmap. As it turns out that's fixed upstream
and systemd master uses an ordered hashmap because of this, which at
least preserves order within single files. Traditionally files in
sysctl.d have been prefixed with numbers to ensure an order and that's
now completely non-deterministic on Xenial.

Relevant upstream commit:
https://github.com/systemd/systemd/commit/886cf982d3018f7451f0548dadbc05bd2d583bb6

Note that conf_files_list_nulstr in master sorts the configuration files
using strcmp, so even order of configuration files should be obeyed.

** Affects: systemd (Ubuntu)
     Importance: Medium
         Status: New

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Title:
  systemd-sysctl in Xenial is not obeying the order of the sysctls

Status in systemd package in Ubuntu:
  New

Bug description:
  systemd-sysctl in Xenial forces itself over procps by shipping a link
  for procps.service to systemd-sysctl.service. However, it does not
  obey the order both of the files and also of the sysctls within the
  files. Instead it uses a simple hashmap. As it turns out that's fixed
  upstream and systemd master uses an ordered hashmap because of this,
  which at least preserves order within single files. Traditionally
  files in sysctl.d have been prefixed with numbers to ensure an order
  and that's now completely non-deterministic on Xenial.

  Relevant upstream commit:
  https://github.com/systemd/systemd/commit/886cf982d3018f7451f0548dadbc05bd2d583bb6

  Note that conf_files_list_nulstr in master sorts the configuration
  files using strcmp, so even order of configuration files should be
  obeyed.

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