> The problem seems to be that any package install during systemd boot of
> a package that only provides sysvinit scripts will fail. Reading invoke-rc.d,
> i'm not really sure why a proper systemd service woudlnt fail also.
The RUNLEVELHELPER check is buggy, yes. However, the behavior of
invoke-rc.d is by design; if the runlevel can't be determined (which
according to systemd it still would not be, even if the bug in invoke-
rc.d was fixed), invoke-rc.d should default to doing nothing because
there's no system policy to say whether the service should be started.
I think there's a case to be made that this is a bug in systemd, for
returning 'unknown' for the runlevel in these cases. The historical
behavior of sysvinit is that everything triggered from /etc/init.d/rc
inherits the value of the current runlevel in the RUNLEVEL environment
variable; and running e.g. 'RUNLEVEL=2 runlevel' - including on systemd
- will report this env value as the target runlevel.
$ runlevel
N 5
$ PREVLEVEL=5 RUNLEVEL=2 runlevel
5 2
$
Unless cloud-init is being called so early in boot that the runlevel
target is not known - which seems very unlikely - then I think the
correct thing for systemd to do is to honor this historical behavior by
making the 'runlevel' command return the target runlevel when called
from a systemd unit that's run at boot, even if that target has not yet
been reached. Opening a task on systemd for this.
Note, BTW, that the above also suggests a workaround for cloud-init to
employ. If for whatever reason systemd will not set itself up to return
the proper runlevel value, cloud-init can simply set RUNLEVEL=2 in the
environment prior to calling dpkg, and invoke-rc.d will pick this up and
DTRT with it.
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu)
Importance: Undecided => High
** Changed in: systemd (Ubuntu)
Status: New => Triaged
** Changed in: systemd (Ubuntu)
Assignee: (unassigned) => Martin Pitt (pitti)
** Changed in: init-system-helpers (Ubuntu)
Importance: High => Low
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https://bugs.launchpad.net/bugs/1575572
Title:
apache2 fails to start if installed via cloud config (on Xenial)
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