[Bug 1771802] Re: enable rc-local.service unit by default

[Dimitri John Ledkov]

rc.local is enabled, and part of the initial boot target... if it
exists, and is executable.

Can you please provide steps, or details of your system, on which you
observe that it was not executed on boot? when present, and executable?

Note by default on ubuntu, there is no rc.local shipped. But would be
used, if there is one on boot.

# cat /etc/rc.local 
#!/bin/sh
echo Hello rc.local
exit 0

# sudo chmod +x /etc/rc.local
# sudo reboot
# journalctl -b -u rc-local.service
-- Logs begin at Thu 2018-05-17 13:22:46 UTC, end at Thu 2018-05-17 13:24:28 UTC. --
May 17 13:23:39 test-rclocal systemd[1]: Starting /etc/rc.local Compatibility...
May 17 13:23:39 test-rclocal rc.local[205]: Hello rc.local
May 17 13:23:39 test-rclocal systemd[1]: Started /etc/rc.local Compatibility.


** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1771802

Title:
  enable rc-local.service unit by default

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  Every other systemd-infected distribution leaves the rc-local.service
  unit enabled; this is probably because provisioning systems need to
  use it to launch first-boot tasks.

  Ubuntu has been blindly following suit in every other respect and
  should do the same here also.  It's a null op unless the file exists
  and is executable, so enabling it gives all the benefits for extremely
  negligible cost.

  Example reproducable bug:
  * preseed a new host and an rc.local expected to run on boot
  * boot and realise rc.local didn't run
  * realise you can't enable it in the preseed as systemctl is not affecting the target system
  * curse Lennart (again) and run Devuan instead where things just work as they should

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