terraform

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The Terraform repository contains the core functionality of the Terraform infrastructure as code tool, providing a comprehensive solution for managing and executing Terraform configurations. The repository is organized into several key directories, each responsible for a specific aspect of Terraform's functionality.

The …/configs directory is responsible for handling Terraform configurations, including parsing and loading configuration files, managing modules and their dependencies, and validating configuration elements such as resources, variables, outputs, and providers. This is a crucial component, as it enables Terraform to understand and work with the user-defined infrastructure as code.

The …/states directory is responsible for managing the state of Terraform configurations, including reading, writing, and persisting state, as well as locking state files to ensure safe concurrent access. This state management functionality is essential for Terraform to track and apply changes to the infrastructure over time.

The …/remote and …/cloud directories provide the implementation of the "Remote" backend, which allows Terraform to perform operations in a remote backend environment, such as Terraform Cloud or Terraform Enterprise. This integration enables users to manage their infrastructure in a centralized, collaborative, and enterprise-grade environment.

The …/terraform directory contains the core functionality of the Terraform codebase, including the implementation of the Context struct, which represents the execution context for Terraform operations. This directory includes functionality for handling input, managing provider and provisioner plugins, controlling the execution of the Terraform graph, and performing various Terraform operations such as planning, applying, importing, and validating configurations.

The …/stackeval directory contains the core logic for evaluating Terraform stacks, including the planning, applying, and inspecting of stack configurations. This functionality is crucial for Terraform's ability to manage complex, multi-resource infrastructure deployments.

The …/lang directory contains the runtime aspects of Terraform's configuration language, including expression evaluation, built-in function management, and global reference analysis. This is a fundamental component that enables Terraform to interpret and execute the user-defined infrastructure configurations.

The …/jsonformat directory provides the functionality for formatting and displaying the JSON-structured output produced by various Terraform commands when the -json flag is used. This allows Terraform to present its output in a machine-readable format, facilitating integration with other tools and workflows.

The …/plugin directory contains the functionality related to the management and communication of Terraform plugins, including the discovery, caching, and RPC-based interaction with provider and provisioner plugins. This enables Terraform to extend its capabilities by integrating with a wide range of infrastructure providers and provisioners.

Overall, the Terraform repository provides a robust and extensible infrastructure as code solution, with a focus on modularity, flexibility, and enterprise-grade features. The codebase is organized into logical directories, each responsible for a specific aspect of Terraform's functionality, allowing for maintainable and scalable development.

References: internal/configs

The core functionality of the …/configs directory is to handle and manage Terraform configurations, including parsing, loading, and validating configurations.

References: internal/configs/configload

The …/configload directory provides the core functionality for loading and installing Terraform configurations, including module management, directory copying, and file inode handling.

References: internal/configs, internal/configs/configschema

The …/configs directory contains the core functionality for handling Terraform configurations. This includes parsing and loading configuration files, managing modules and their dependencies, validating configuration elements, and providing representations of various configuration constructs such as resources, variables, outputs, and providers.

References: internal/configs/checks.go, internal/configs/configschema

The configs/checks.go file in the Terraform codebase provides functionality related to validating Terraform configurations, including the parsing and handling of configuration-defined checks, preconditions, and postconditions.

References: internal/configs/hcl2shim

The hcl2shim package in the Terraform codebase provides functionality for converting between Terraform's internal configuration representation and the HCL2 (HashiCorp Configuration Language) representation used in configuration files. This is a crucial part of Terraform's codebase, as it allows for seamless integration between the new HCL2-based configuration language and the legacy HCL1/HIL-based configuration handling.

References: internal/configs/configtesting

The …/configtesting directory contains utility functions and tests for working with synthetic HCL (HashiCorp Configuration Language) bodies. The main functionality is provided by the SynthBody() function, which generates a synthetic hcl.Body object that can be used to simulate the behavior of an HCL configuration without the need for the actual configuration. This is useful for testing and other scenarios where the real configuration is not available.

References: internal/states

The …/states directory in the Terraform codebase is responsible for managing the state of Terraform configurations. It provides the core functionality for reading, writing, and persisting Terraform state, as well as locking state files to ensure safe concurrent access.

References: internal/states/remote

The …/remote directory in the Terraform codebase provides the core functionality for managing remote state storage for Terraform configurations. This subsection covers the key components and their responsibilities in this area.

References: internal/states/statemgr

The …/statemgr directory contains the core functionality for managing the state of Terraform configurations, including the file-based state manager and state locking.

References: internal/states/statefile

The statefile package in the Terraform codebase provides the core functionality for handling the serialization and deserialization of Terraform state files. This includes reading, writing, and upgrading state files across different versions.

References: internal/backend/remote, internal/cloud

The …/remote directory contains the implementation of the "Remote" backend in Terraform, which allows Terraform to perform operations in a remote backend environment, such as Terraform Cloud or Terraform Enterprise. The key functionality in this directory includes:

References: internal/backend/remote

The backend.go file in the …/remote directory provides the core implementation of the "Remote" backend in Terraform. This backend allows Terraform to perform operations in a remote backend environment, such as Terraform Cloud or Terraform Enterprise.

References: internal/backend/remote

The opApply() function in the …/backend_apply.go file is responsible for handling the "Apply" operation in the remote backend. This function performs the following key tasks:

References: internal/backend/remote, internal/backend/remote/backend_state.go

The backend_state.go file in the …/remote directory provides an implementation of the remote.Client interface for managing the Terraform state when using the remote backend. The remoteClient struct encapsulates the functionality for interacting with the remote backend, including retrieving, uploading, and locking the state.

References: internal/cloud

The …/cloud directory contains the core functionality for the Terraform Cloud backend implementation. The main components are:

References: internal/cloud

The …/cloud directory contains the core functionality for integrating with Terraform Enterprise (TFE), which is the on-premises version of the Terraform Cloud platform. This integration allows Terraform to manage infrastructure in a TFE environment, handling tasks such as state management, plan generation, and apply execution in the remote cloud environment.

References: internal/terraform, internal/stacks/stackruntime, internal/stacks/stackruntime/internal/stackeval

The core functionality of the Terraform operations is handled in the …/terraform directory. This directory contains the implementation of the Context struct, which is the central entry point for executing Terraform operations.

References: internal/terraform, internal/stacks/stackruntime/internal/stackeval

The core functionality for planning and applying changes to Terraform configurations is handled by the Context struct and its associated methods in the …/terraform directory.

References: internal/terraform

The Context struct is the central entry point for Terraform operations. It is responsible for managing the execution of Terraform operations, including handling input, managing provider and provisioner plugins, and controlling the execution of the Terraform graph.

References: internal/terraform

The context_import.go file in the Terraform codebase contains the implementation of the Import functionality in Terraform, which allows users to import existing resources into the Terraform state, without having to define them in the configuration.

References: internal/stacks/stackruntime/hooks

The …/hooks directory contains functionality related to the management and reporting of various events and statuses during the execution of a Terraform stack, including the tracking of component and resource instance status and changes.

References: internal/stacks/stackruntime/testing

The …/testing directory contains the implementation of a mock provider for testing purposes in the Terraform project. The mock provider is designed to simulate the behavior of a real provider, allowing for the testing and development of Terraform functionality without the need for a live provider.

References: internal/command, internal/command/jsonformat

The Terraform command-line interface (CLI) is a crucial component of the Terraform ecosystem, providing the primary means for users to interact with Terraform's core functionality. The …/command directory contains the implementation of the Terraform CLI, including the handling of various Terraform commands, state management, working directory management, and integration with external services like Terraform Cloud.

References: internal/command/arguments

The main functionality related to parsing the command-line arguments for various Terraform commands is located in the …/arguments directory. This subsection covers the key components and design decisions in this area.

References: internal/command/format, internal/command/views, internal/command/jsonformat

The format.go file in the …/format directory provides functionality for formatting and displaying diagnostic messages, as well as other utility functions for formatting Terraform output in a user-friendly way.

References: internal/command/clistate

The LocalState struct, defined in …/local_state.go, is responsible for managing the reading, writing, and locking of Terraform state files on the local file system.

References: internal/command/jsonprovider

The jsonprovider package in the Terraform codebase provides functionality for integrating with Terraform providers, including the management of provider plugins and the serialization of provider schemas.

References: terraform

The …/cloud package provides the core functionality for integrating with Terraform Cloud and Terraform Enterprise. The key components in this package are:

References: internal/command/e2etest

The key implementation details in the …/e2etest directory are:

References: internal/legacy

The …/legacy directory contains the legacy implementation of various components related to Terraform's resource management and state handling. The key components in this directory are:

References: internal/legacy/terraform

The …/terraform directory contains the legacy implementation of Terraform's resource management and state handling functionality. The key components in this directory are:

References: internal/legacy/helper

The …/helper directory contains the legacy helper package in the Terraform codebase. This package provides various utility functions and data structures that were previously used throughout the Terraform codebase, but are now considered legacy and are intended to be removed in the future.

References: internal/legacy/helper/schema

The schema package in the Terraform codebase was previously used to represent the SDK, which is now a separate library external to Terraform Core. Some of the functionality from this package is still used by Terraform's remote state backends, but the entire package is intended to be removed in the future.

References: internal/legacy/helper/hashcode

The hashcode package provides functions for generating unique hashcodes for strings and slices of strings. This functionality is used throughout the Terraform codebase for various purposes, such as indexing or identifying data structures.

References: internal/plugin

The …/plugin directory in the Terraform codebase contains functionality related to the management and communication of Terraform plugins. The key components in this directory are:

References: internal/plugin/discovery

The terraform/internal/plugin/discovery directory in the Terraform codebase contains functionality related to the discovery and management of Terraform plugins. The main components in this directory are:

References: internal/plugin/grpc_provider.go, internal/plugin/grpc_provisioner.go

The grpc_provider.go and grpc_provisioner.go files in the …/plugin directory implement the client-side and server-side components of the gRPC communication between Terraform Core and the provider and provisioner plugins, respectively.

References: internal/plugin/convert

The …/convert directory provides functionality for converting between Terraform's internal representations and the protobuf-based representations used in the Terraform plugin protocol. This allows Terraform to communicate with plugins using a standardized protocol, while still maintaining its own internal representations that are optimized for its use case.

References: internal/plugin/mock_proto

The …/mock_proto directory contains the implementation of mock plugin implementations for testing purposes, allowing developers to simulate the behavior of the actual plugin implementations.