Merge pull request #12223 from yuwata/network-wireguard-preshared-key-file

network: add PresharedKeyFile= setting and make reading key file failure fatal

diff --combined NEWS
index a0c722839a3e026f6928b1c20768061d04615cf7,a1dbd97434eb5329d1cf4dd1fab1b3dc28baa227..8c8d7c08bacfa8dd2b6aafb3a6c21bd20c1c697f
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -75,12 -75,6 +75,12 @@@ CHANGES WITH 242
            has been updated to include the new rseq() system call introduced in
            kernel 4.15.
  
 +        * A new time-set.target has been added that indicates that the system
 +          time has been set from a local source (possibly imprecise). The
 +          existing time-sync.target is stronger and indicates that the time has
 +          been synchronized with a precise external source. Services where
 +          approximate time is sufficient should use the new target.
 +
          * "systemctl start" (and related commands) learnt a new
            --show-transaction option. If specified brief information about all
            jobs queued because of the requested operation is shown.
@@@ -116,8 -110,8 +116,8 @@@
          * The new TripleSampling= option in .network files may be used to
            configure CAN triple sampling.
  
-         * A new .netdev setting PrivateKeyFile= may be used to point to private
-           key for a WireGuard interface.
+         * A new .netdev settings PrivateKeyFile= and PresharedKeyFile= may be
+           used to point to private or preshared key for a WireGuard interface.
  
          * /etc/crypttab now supports the same-cpu-crypt and
            submit-from-crypt-cpus options to tweak encryption work scheduling
@@@ -249,18 -243,17 +249,18 @@@
          Davide Cavalca, David Michael, David Rheinsberg, emersion, Evgeny
          Vereshchagin, Filipe Brandenburger, Franck Bui, Frantisek Sumsal,
          Giacinto Cifelli, Hans de Goede, Hugo Kindel, Ignat Korchagin, Insun
 -        Pyo, Jan Engelhardt, Jonathan Lebon, Jonathon Kowalski, Jörg Sommer,
 -        Jörg Thalheim, Kai-Heng Feng, Lennart Poettering, Lubomir Rintel,
 -        Martin Pitt, Matthias Klumpp, Michael Biebl, Michael Niewöhner, Michael
 -        Olbrich, Michal Sekletar, Mike Lothian, Piotr Drąg, Riccardo Schirone,
 +        Pyo, Jan Engelhardt, Jonas Dorel, Jonathan Lebon, Jonathon Kowalski,
 +        Jörg Sommer, Jörg Thalheim, Jussi Pakkanen, Kai-Heng Feng, Lennart
 +        Poettering, Lubomir Rintel, Luís Ferreira, Martin Pitt, Matthias
 +        Klumpp, Michael Biebl, Michael Niewöhner, Michael Olbrich, Michal
 +        Sekletar, Mike Lothian, Paul Menzel, Piotr Drąg, Riccardo Schirone,
          Robin Elvedi, Roman Kulikov, Ronald Tschalär, Ross Burton, Ryan
          Gonzalez, Stephane Chazelas, StKob, Susant Sahani, Sylvain Plantefève,
          Szabolcs Fruhwald, Taro Yamada, Theo Ouzhinski, Thomas Haller, Tobias
          Jungel, Tom Yan, Tony Asleson, Topi Miettinen, unixsysadmin, Van Laser,
          Vesa Jääskeläinen, Yu, Li-Yu, Yu Watanabe, Zbigniew Jędrzejewski-Szmek
  
 -        — Warsaw, 2019-04-03
 +        — Warsaw, 2019-04-08
  
  CHANGES WITH 241: