Backport #15780 - Fix data race dbaccessor #15845
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The following fixes the issue when rebinding the address and a worker is starting the dbApp can be nil. To fix the problem we check if the underlying catacomb is dying. If that's the case then return that error. If it's not dying, force the worker to try again with the new sentinel error. As all errors where currently fatal, we add a check to ensure that if the error is ErrTryAgain, that a worker can come around and attempt to try the worker again. Upon the next time around if the catacomb is dying, then it will correctly die. If the dbApp is still nil, it will continue trying, otherwise it will create a worker. We're leaning into the way the runner works here to ensure that we can handle the case of a dbApp worker being nil. Also you can not put the worker creation outside of the start worker function, as this opens up possibilities of a worker being created twice and only one of them being used.
The following just updates the error message to be more helpful when a error happens.
As a driveby make const error a real const.
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jujubot
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#15881 Merges: - #15845 - #15852 - #15854 - #15849 - #15855 - #15857 - #15861 - #15862 - #15825 - #15866 - #15863 - #15870 - #15871 - #15872 - #15873 - #15874 - #15875 One substantial conflict in `cmd/juju/application/deployer/bundlehandler.go` & `cmd/juju/application/deployer/bundlehandler_test.go`, resulting in failing unit tests. The conflict relates to this PR: - #15825 These were fixed by the two tops commits ### QA Steps Ensure all unit tests pass ``` go test github.com/juju/juju/cmd/juju/application/deployer go test github.com/juju/juju/core/charm go test github.com/juju/juju/apiserver/facades/client/application ``` Ensure we can deploy a complex bundle ``` juju deploy kubeflow ```
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#15896 Forward ports: - #15845 - #15725 - #15852 - #15854 - #15849 - #15855 - #15857 - #15861 - #15862 - #15860 - #15864 - #15825 - #15866 - #15863 - #15870 - #15871 - #15872 - #15873 - #15874 - #15876 - #15875 - #15881 - #15727 - #15883 - #15884 - #15880 - #15879 - #15886 - #15887 - #15877 - #15888 - #15893 - #15894 Conflicts: - cmd/juju/ssh/debugcode_test.go - cmd/juju/ssh/debughooks_test.go - cmd/juju/ssh/scp_unix_test.go - cmd/juju/ssh/ssh_machine.go - cmd/juju/ssh/ssh_machine_test.go - cmd/juju/ssh/ssh_unix_test.go - worker/dbaccessor/worker.go - caas/kubernetes/provider/k8s_test.go - caas/kubernetes/provider/operator_test.go - caas/kubernetes/provider/package_test.go - caas/kubernetes/provider/rbac.go - cmd/juju/application/deployer/bundlehandler.go - cmd/juju/application/deployer/bundlehandler_test.go - cmd/jujud/agent/model/manifolds.go - core/bundle/changes/changes.go - worker/caasapplicationprovisioner/application.go - worker/caasapplicationprovisioner/application_test.go - worker/caasapplicationprovisioner/mock_test.go
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Backports #15780 to fix data race in dbaccessor.