[Bug 1541532] Re: migrate UTC setting from /etc/default/rcS to adjtime

[Martin Pitt]

> do no actual drift correction at boot, as the kernel does that by
itself

I found that the only place which potentially would do that is
/etc/init.d/hwclock.sh, but this would only be run under SysV init which
we never supported and don't even have binary packages for. Under
upstart, /etc/init/hwclock.conf uses --noadjfile and parses the UTC
setting from /etc/default/rcS (that needs to be fixed), under systemd
the file is masked and systemd itself parses the third line to determine
UTC vs. LOCAL.

I'm currently running an archive grep for "default/rcS|adjtime" to find
and review all users of either.

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https://bugs.launchpad.net/bugs/1541532

Title:
  migrate UTC setting from  /etc/default/rcS to adjtime

Status in systemd package in Ubuntu:
  Triaged

Bug description:
  This has been an Ubuntu delta in systemd and perhaps other Ubuntu
  packages for a long time. But /etc/default/rcS is a SysV-ism, and no
  other setting in there is relevant. Steps:

   * Bump the version guard in systemd.conf for migrating the actual setting (keep until 16.04 LTS)
   * Ensure that we only look at the LOCAL setting during boot, and do no actual drift correction at boot, as the kernel does that by itself.
   * grep the archive for software which might directly look at or even write that file (Ubuntu specific config tools and the like).

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