93246bd978
In order to determine if we need to re-read a data source during plan, we need to compare the newly evaluated configuration with the stored state. To do that we create a ProposedNewVal, which if there are no changes, should match the existing state exactly. A problem arises if the remote data source contains any blocks, and they are not set in the configuration. Terraform always decodes configuration blocks as empty containers, however the legacy SDK cannot correctly handle empty blocks and may return a null block which is saved to the state. In order to correctly make the comparison for planning, we need to reify those null blocks as empty containers in the cty value. The createEmptyBlocks helper converts any null NestingList or NestingSet blocks to empty list or set cty values. We only need to be concerned with List and Set, because those are the only types that can be defined with the legacy SDK. In hindsight these could have been normalized in the legacy SDK shims had this problem been uncovered earlier, but for the sake of compatibility we will now normalize these in core. |
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| builtin | ||
| command | ||
| communicator | ||
| config | ||
| configs | ||
| contrib | ||
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| digraph | ||
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| flatmap | ||
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| httpclient | ||
| instances | ||
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| lang | ||
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| plans | ||
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| providers | ||
| provisioners | ||
| registry | ||
| repl | ||
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| terraform | ||
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| version | ||
| website | ||
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| .hashibot.hcl | ||
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| CHANGELOG.md | ||
| CODEOWNERS | ||
| Dockerfile | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
| checkpoint.go | ||
| codecov.yml | ||
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| help.go | ||
| main.go | ||
| main_test.go | ||
| panic.go | ||
| plugins.go | ||
| provider_source.go | ||
| signal_unix.go | ||
| signal_windows.go | ||
| synchronized_writers.go | ||
| version.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:
-
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 that each have their own repository in the terraform-providers organization on GitHub. Instructions for developing each provider are in the associated README file. For more information, see the provider development overview.
To learn more about compiling Terraform and contributing suggested changes, please refer to the contributing guide.