[Bug 1691474] [NEW] invoke-rc.d service start fails on services with upstart-only scripts

[Chris J Arges]

Public bug reported:

[Impact]
On 16.04+ if you using upstart as your primary init system "enabled" services that _only_ have upstart scripts fail to start with invoke-rc.d (with a default policy). This is problematic as #DEBHELPER# tokens in maintscripts rely on invoke-rc.d to start/stop services and fail to start services on installation.

[Test Case]
Boot into affected system with upstart as default init.
Try starting an 'upstart only' service with 'invoke-rc.d service start'.
It is expected this should work.

[Regression Potential]
14.04/upstart behavior is that invoke-rc.d works, and 16.04/systemd also has invoke-rc.d start working with enabled services and default policy. 16.04/upstart should be the same.

** Affects: init-system-helpers (Ubuntu)
     Importance: High
     Assignee: Chris J Arges (arges)
         Status: In Progress

** Affects: init-system-helpers (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: init-system-helpers (Ubuntu Yakkety)
     Importance: Undecided
         Status: New

** Affects: init-system-helpers (Ubuntu Zesty)
     Importance: Undecided
         Status: New

** Also affects: init-system-helpers (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: init-system-helpers (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: init-system-helpers (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1691474

Title:
  invoke-rc.d service start fails on services with upstart-only scripts

Status in init-system-helpers package in Ubuntu:
  In Progress
Status in init-system-helpers source package in Xenial:
  New
Status in init-system-helpers source package in Yakkety:
  New
Status in init-system-helpers source package in Zesty:
  New

Bug description:
  [Impact]
  On 16.04+ if you using upstart as your primary init system "enabled" services that _only_ have upstart scripts fail to start with invoke-rc.d (with a default policy). This is problematic as #DEBHELPER# tokens in maintscripts rely on invoke-rc.d to start/stop services and fail to start services on installation.

  [Test Case]
  Boot into affected system with upstart as default init.
  Try starting an 'upstart only' service with 'invoke-rc.d service start'.
  It is expected this should work.

  [Regression Potential]
  14.04/upstart behavior is that invoke-rc.d works, and 16.04/systemd also has invoke-rc.d start working with enabled services and default policy. 16.04/upstart should be the same.

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