Description of problem: When creating a checkpoint and then immediately rolling it back, all devices are reconnected although no actual changes need to be rolled back. Cockpit rolls back a checkpoint when a configuration change has failed, and to make matters worse, Cockpit always takes checkpoints over _all_ devices, because why not. This mostly doesn't matter, but because of the asynchronicity of everything, weird things are happening sometimes. Version-Release number of selected component (if applicable): NetworkManager-1.4.4-3.fc25.x86_64 How reproducible: Always. Steps to Reproduce: 1. gdbus call -y -d org.freedesktop.NetworkManager -o /org/freedesktop/NetworkManager -m org.freedesktop.NetworkManager.CheckpointCreate '[]' 0 0 (objectpath '/org/freedesktop/NetworkManager/Checkpoint/1',) 2. gdbus call -y -d org.freedesktop.NetworkManager -o /org/freedesktop/NetworkManager -m org.freedesktop.NetworkManager.CheckpointRollback /org/freedesktop/NetworkManager/Checkpoint/1 Actual results: All interfaces are reconnected. Expected results: Nothing happens except the destruction of the checkpoint. Additional info: Cockpit should really make checkpoints just for the interfaces that are being changed.
Created attachment 1260052 [details] [PATCH] checkpoint: reactivate/update connections only if necessary on rollback The attached patch avoids unnecessary operations (update and activate) on connections during a rollback.
/* ... or if the applied connection differs */ + if (!nm_connection_compare (dev_checkpoint->applied_connection, + nm_active_connection_get_applied_connection (active), + NM_SETTING_COMPARE_FLAG_EXACT)) { you could instead compare the version-id of the active-connection. The difference is, your check tests whether the applied-connection differs, the version-id tests whether the active-connection was deactivated/reapplied in the meantime. That latter test might make more sense in this context(??). _LOGT ("rollback: connection is active"); these log statements could mention the connection they are talking about... otherwise, the logfile may contain several "connection is active" lines, but it's a bit confusing. indention in + _LOGD ("rollback: updating connection %s", + nm_setting otherwise, lgtm
Fyi, Cockpit is now much better behaved: https://github.com/cockpit-project/cockpit/pull/5986
Created attachment 1260321 [details] [PATCH v2] checkpoint: reactivate/update connections only if necessary on rollback (In reply to Thomas Haller from comment #2) > /* ... or if the applied connection differs */ > + if (!nm_connection_compare (dev_checkpoint->applied_connection, > + nm_active_connection_get_applied_connection > (active), > + NM_SETTING_COMPARE_FLAG_EXACT)) { > > you could instead compare the version-id of the active-connection. > The difference is, your check tests whether the applied-connection differs, > the version-id tests whether the active-connection was deactivated/reapplied > in the meantime. That latter test might make more sense in this context(??). Both checks are fine, but comparing the version id is simpler and faster. > _LOGT ("rollback: connection is active"); > > these log statements could mention the connection they are talking about... > otherwise, the logfile may contain several "connection is active" lines, but > it's a bit confusing. > > indention in > + _LOGD ("rollback: updating connection %s", > + nm_setting > Fixed.
lgtm now
Applied to master: https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=b9d11ffaa217c83d16e476523815478ce0b4f9a8
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