[Bug 1314598] [NEW] [Precise] drbd8: drbdadm does not run compat mode when DRBD_DONT_WARN_ON_VERSION_MISMATCH is set

[Stefan Bader]

Public bug reported:

SRU Justification:

Impact: This is for now only relevant for the 12.04 (Precise) backport
of drbd-utils 8.4.x as that uses the 8.3 compat mode when running with a
linux kernel module from kernel 3.2.x. Problem is the following code:

        if (!getenv("DRBD_DONT_WARN_ON_VERSION_MISMATCH"))
                warn_on_version_mismatch();

        maybe_exec_drbdadm_83(argv);

Because maybe_ecec_drbdadm_83 relies on a structure being filled in
warn_on_version_mismatch only.

Fix: Move the code to set up the version number from
warn_on_version_mismatch() outside, so it is always called.

Testcase: When running a 3.2 kernel and the 8.4.x version of drbd8-utils
"drbdadm --version" without DRBD_DONT_WARN_ON_VERSION_MISMATCH set in
the environment, It will return a 8.3 version number. Otherwise a
version 8.4. When the bug is fixed it has to be a 8.3 version in both
cases.

** Affects: drbd8 (Ubuntu)
     Importance: Medium
     Assignee: Stefan Bader (smb)
         Status: Triaged

** Changed in: drbd8 (Ubuntu)
   Importance: Undecided => Medium

** Changed in: drbd8 (Ubuntu)
     Assignee: (unassigned) => Stefan Bader (smb)

** Changed in: drbd8 (Ubuntu)
       Status: New => Triaged

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Title:
  [Precise] drbd8: drbdadm does not run compat mode when
  DRBD_DONT_WARN_ON_VERSION_MISMATCH is set

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