ae3c0c6a4a
Prior to Terraform 0.12 these two functions were the only way to construct literal lists and maps (respectively) in HIL expressions. Terraform 0.12, by switching to HCL 2, introduced first-class syntax for constructing tuple and object values, which can then be converted into list and map values using the tolist and tomap type conversion functions. We marked both of these functions as deprecated in the Terraform v0.12 release and have since then mentioned in the docs that they will be removed in a future Terraform version. The "terraform 0.12upgrade" tool from Terraform v0.12 also included a rule to automatically rewrite uses of these functions into equivalent new syntax. The main motivation for removing these now is just to get this change made prior to Terraform 1.0. as we'll be doing with various other deprecations. However, a specific reason for these two functions in particular is that their existence is what caused us to invent the idea of a "type expression" as a distinct kind of expression in Terraform v0.12, and so removing them now would allow potentially unifying type expressions with value expressions in a future release. We do not have any current specific plans to make that change, but one potential motivation for doing so would be to take another attempt at a generalized "convert" function which takes a type as one of its arguments. Our previous attempt to implement such a function was foiled by the fact that Terraform's expression validator doesn't have any way to know to treat one argument of a particular function as special, and so it was generating incorrect error messages. We won't necessarily do that, but having these "list" and "map" functions out of the way leaves the option open. |
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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.
-
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.
-
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.
To learn more about how we handle bug reports, please read the bug triage guide.