terraform: remove state from validate graph walk
#26063
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A recent change to the backend had a side effect of causing all input vars to be requested twice (due to two calls to `contextDirect`) and provider input values to be omitted entirely (those were populated during Validate, but Validate was called on the "extra" context and not the returned context). This PR adds a Context.StatelessCopy function which returns a nearly-identical copy of a terraform.Context with the state "zeroed out", which can then be Validate()d. A better, future refactor should remove the need for this function and instead modify Validate() itself to ignore state. Fixes #26027 I've added tests that confirm both behaviors; I am not sure what test covers the behavior that lead to this change in the first place but I did verify locally using the reproduction in the original PR.
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alisdair
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Aug 31, 2020
Comment on lines
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| // This will (helpfully) panic if more than one variable is requested during plan: | ||
| // https://github.com/hashicorp/terraform/issues/26027 | ||
| close := testInteractiveInput(t, []string{"bar"}) |
jbardin
approved these changes
Aug 31, 2020
jbardin
reviewed
Aug 31, 2020
terraform/context_apply_test.go
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| // from the targeted resource | ||
| if len(mod.OutputValues) != 0 { | ||
| t.Fatalf("expected 0 outputs, got: %#v", mod.OutputValues) | ||
| // the root output should not get removed |
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Maybe change this comment to indicate that we're verifying the current status-quo, but it's not necessarily incorrect to remove the output if we can manage it in the future.
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This pull reverts a recent change to
backend/localwhich created two context, one with and one without state. Instead I have removed the state entirely from the validate graph (by explicitly passing astates.NewState()).This changed caused a test failure, which (ty so much for the help) @jbardin discovered was inaccurate all along: the test's call to
Validate()was actually what was removing the output from state, which should not have been happening duringValidateanyway. The new expected test output matches terraform's actual behavior on the command line: if you use -target to destroy a resource, an output that references only that resource is not removed from state.This includes two tests to cover the expected behavior:
TestPlan_varsUnsethas been updated so it will panic if it gets more than one request to input a variableTestPlan_providerArgumentUnsetcovers terraform not properly storing provider args from command line when there is no provider block #26035Fixes #26035, #26027