343279110a
Previously our graph walker expected to recieve a data structure containing schemas for all of the provider and provisioner plugins used in the configuration and state. That made sense back when terraform.NewContext was responsible for loading all of the schemas before taking any other action, but it no longer has that responsiblity. Instead, we'll now make sure that the "contextPlugins" object reaches all of the locations where we need schema -- many of which already had access to that object anyway -- and then load the needed schemas just in time. The contextPlugins object memoizes schema lookups, so we can safely call it many times with the same provider address or provisioner type name and know that it'll still only load each distinct plugin once per Context object. As of this commit, the Context.Schemas method is now a public interface only and not used by logic in the "terraform" package at all. However, that does leave us in a rather tenuous situation of relying on the fact that all practical users of terraform.Context end up calling "Schemas" at some point in order to verify that we have all of the expected versions of plugins. That's a non-obvious implicit dependency, and so in subsequent commits we'll gradually move all responsibility for verifying plugin versions into the caller of terraform.NewContext, which'll heal a long-standing architectural wart whereby the caller is responsible for installing and locating the plugin executables but not for verifying that what's installed is conforming to the current configuration and dependency lock file. |
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| 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 | ||
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.