36c4d4c241
Previously we had three different layers all thinking they were responsible for substituting a default value for an unset root module variable: - the local backend, via logic in backend.ParseVariableValues - the context.Plan function (and other similar functions) trying to preprocess the input variables using terraform.mergeDefaultInputVariableValues . - the newer prepareFinalInputVariableValue, which aims to centralize all of the variable preparation logic so it can be common to both root and child module variables. The second of these was also trying to handle type constraint checking, which is also the responsibility of the central function and not something we need to handle so early. Only the last of these consistently handles both root and child module variables, and so is the one we ought to keep. The others are now redundant and are causing prepareFinalInputVariableValue to get a slightly corrupted view of the caller's chosen variable values. To rectify that, here we remove the two redundant layers altogether and have unset root variables pass through as cty.NilVal all the way to the central prepareFinalInputVariableValue function, which will then handle them in a suitable way which properly respects the "nullable" setting. This commit includes some test changes in the terraform package to make those tests no longer rely on the mergeDefaultInputVariableValues logic we've removed, and to instead explicitly set cty.NilVal for all unset variables to comply with our intended contract for PlanOpts.SetVariables, and similar. (This is so that we can more easily catch bugs in callers where they _don't_ correctly handle input variables; it allows us to distinguish between the caller explicitly marking a variable as unset vs. not describing it at all, where the latter is a bug in the caller.) |
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| .circleci | ||
| .github | ||
| docs | ||
| internal | ||
| scripts | ||
| tools | ||
| version | ||
| website | ||
| .gitignore | ||
| .go-version | ||
| .tfdev | ||
| BUGPROCESS.md | ||
| CHANGELOG.md | ||
| CODEOWNERS | ||
| Dockerfile | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
| checkpoint.go | ||
| codecov.yml | ||
| commands.go | ||
| go.mod | ||
| go.sum | ||
| help.go | ||
| main.go | ||
| main_test.go | ||
| plugins.go | ||
| provider_source.go | ||
| signal_unix.go | ||
| signal_windows.go | ||
| version.go | ||
| working_dir.go | ||
README.md
Terraform
- Website: https://www.terraform.io
- Forums: HashiCorp Discuss
- Documentation: https://www.terraform.io/docs/
- Tutorials: HashiCorp's Learn Platform
- Certification Exam: HashiCorp Certified: Terraform Associate
Terraform is a tool for building, changing, and versioning infrastructure safely and efficiently. Terraform can manage existing and popular service providers as well as custom in-house solutions.
The key features of Terraform are:
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Infrastructure as Code: Infrastructure is described using a high-level configuration syntax. This allows a blueprint of your datacenter to be versioned and treated as you would any other code. Additionally, infrastructure can be shared and re-used.
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Execution Plans: Terraform has a "planning" step where it generates an execution plan. The execution plan shows what Terraform will do when you call apply. This lets you avoid any surprises when Terraform manipulates infrastructure.
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Resource Graph: Terraform builds a graph of all your resources, and parallelizes the creation and modification of any non-dependent resources. Because of this, Terraform builds infrastructure as efficiently as possible, and operators get insight into dependencies in their infrastructure.
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Change Automation: Complex changesets can be applied to your infrastructure with minimal human interaction. With the previously mentioned execution plan and resource graph, you know exactly what Terraform will change and in what order, avoiding many possible human errors.
For more information, see the introduction section of the Terraform website.
Getting Started & Documentation
Documentation is available on the Terraform website:
If you're new to Terraform and want to get started creating infrastructure, please check out our Getting Started guides on HashiCorp's learning platform. There are also additional guides to continue your learning.
Show off your Terraform knowledge by passing a certification exam. Visit the certification page for information about exams and find study materials on HashiCorp's learning platform.
Developing Terraform
This repository contains only Terraform core, which includes the command line interface and the main graph engine. Providers are implemented as plugins, and Terraform can automatically download providers that are published on the Terraform Registry. HashiCorp develops some providers, and others are developed by other organizations. For more information, see Extending Terraform.
To learn more about compiling Terraform and contributing suggested changes, please refer to the contributing guide.
To learn more about how we handle bug reports, please read the bug triage guide.