Hi all, In two days or so, we are going to merge [1]. Without it, if you have events (functions with a '@plugin.event' decoration) that due to before=/after= requirements, otopi could not comply with their priority=, it will continue, ignoring this and only writing a message to the console if you set OTOPI_DEBUG=1. With this change, it will fail. Under normal circumstances, you'll see nothing in the console or the log, just an exit code of 1. If you set an environment variable OTOPI_DEBUG=1, it will emit a "RuntimeError: Priorities were reversed during buildSequence" error, see examples below. You can restore the existing behavior by setting another env var OTOPI_ALLOW_PRIORITY_OVERRIDE=1 . Soon thereafter, we are going to merge [2]. This will replace the algorithm that is used to decide what to run when. In principle, after [1] is merged, they should be compatible. However, the new algorithm does not allow overriding priorities. To revert to the old algorithm, you can set env var OTOPI_ALLOW_LEGACY_BUILDSEQ=1 . The old algorithm (and this option) is intended to be removed eventually, probably after oVirt 4.0 is released. Patches to make engine-setup (engine+dwh+reports) and host-deploy compatible with the new behavior were already merged to master branches. Still we most likely forgot some other tools/flows/etc., so if you encounter such failures please open a bug against the relevant tool. On a more positive (?) side, we also recently added a new package to master, called otopi-debug-plugins. It currently includes two plugins, which are not enabled by default. One of them allows you to get a prompt 'Press Enter to continue' on [ERROR], so it's easier to have a look at the system before the tool might try to rollback or something, the other allows you to enforce a failure at a certain stage, which might be useful to debug/verify failures and especially rollbacks. More details about these are in a new README file [3]. [1] https://gerrit.ovirt.org/55329 [2] https://gerrit.ovirt.org/28775 [3] https://gerrit.ovirt.org/gitweb?p=otopi.git;a=blob;f=README.debug-plugins Examples: 1. # ovirt-host-deploy # echo $? 1 2. # OTOPI_DEBUG=1 ovirt-host-deploy 2>&1 | tail Priorities were reversed during buildSequence: method <bound method ?._init of <otopi.plugins.otopi.core.log.Plugin object at 0x7f9827c9fe10>> with priority 2000 appears after method <bound method ?._preinit of <otopi.plugins.ovirt_host_deploy.core.misc.Plugin object at 0x1032990>> with priority 5000 Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/otopi/__main__.py", line 88, in main installer.execute() File "/usr/lib/python2.7/site-packages/otopi/main.py", line 151, in execute self.context.buildSequence() File "/usr/lib/python2.7/site-packages/otopi/context.py", line 400, in buildSequence raise RuntimeError(msg) RuntimeError: Priorities were reversed during buildSequence: method <bound method ?._init of <otopi.plugins.otopi.core.log.Plugin object at 0x7f9827c9fe10>> with priority 2000 appears after method <bound method ?._preinit of <otopi.plugins.ovirt_host_deploy.core.misc.Plugin object at 0x1032990>> with priority 5000 ('FATAL Internal error (main): Priorities were reversed during buildSequence: method <bound method ?._init of <otopi.plugins.otopi.core.log.Plugin object at 0x7f9827c9fe10>> with priority 2000 appears after method <bound method ?._preinit of <otopi.plugins.ovirt_host_deploy.core.misc.Plugin object at 0x1032990>> with priority 5000',) 3. # OTOPI_DEBUG=1 OTOPI_ALLOW_PRIORITY_OVERRIDE=1 ovirt-host-deploy ... Priorities were reversed during buildSequence: method <bound method ?._init of <otopi.plugins.otopi.core.log.Plugin object at 0x7fbe17f51e10>> with priority 2000 appears after method <bound method ?._preinit of <otopi.plugins.ovirt_host_deploy.core.misc.Plugin object at 0x107f8d0>> with priority 5000 [ INFO ] Stage: Initializing Continuing will configure this host for serving as hypervisor. Are you sure you want to continue? (yes/no) And with [2]: 4. # OTOPI_DEBUG=1 ovirt-host-deploy ... _toposortBuildSequence failed: Cyclic dependencies found ('FATAL Internal error (main): Cyclic dependencies found',) Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/otopi/__main__.py", line 88, in main installer.execute() File "/usr/lib/python2.7/site-packages/otopi/main.py", line 151, in execute self.context.buildSequence() File "/usr/lib/python2.7/site-packages/otopi/context.py", line 665, in buildSequence self._sequence = self._toposortBuildSequence() File "/usr/lib/python2.7/site-packages/otopi/context.py", line 624, in _toposortBuildSequence raise RuntimeError(_('Cyclic dependencies found')) RuntimeError: Cyclic dependencies found 5. # OTOPI_DEBUG=1 OTOPI_ALLOW_PRIORITY_OVERRIDE=1 ovirt-host-deploy (fails the same way as (4.)) 6. # OTOPI_ALLOW_LEGACY_BUILDSEQ=1 OTOPI_DEBUG=1 ovirt-host-deploy (fails similarly to (2.) - you'll see more-or-less outputs of (4.) then (2.) combined) 7. # OTOPI_ALLOW_LEGACY_BUILDSEQ=1 OTOPI_DEBUG=1 OTOPI_ALLOW_PRIORITY_OVERRIDE=1 ovirt-host-deploy (succeeds like (3.), but with part of the output of (4.) before that) Best regards, -- Didi