terraform
Auto-generated from hashicorp/terraform by Mutable.ai Auto WikiRevise
terraform | |
---|---|
GitHub Repository | |
Developer | hashicorp |
Written in | Go |
Stars | 41k |
Watchers | 1.2k |
Created | 03/13/2014 |
Last updated | 04/03/2024 |
License | Other |
Homepage | www.terraform.io |
Repository | hashicorp/terraform |
Auto Wiki | |
Revision | |
Software Version | 0.0.8Basic |
Generated from | Commit 041db6 |
Generated at | 04/04/2024 |
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.
Configuration ManagementRevise
References: internal/configs
The core functionality of the …/configs
directory is to handle and manage Terraform configurations, including parsing, loading, and validating configurations.
Configuration Loading and InstallationRevise
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.
Configuration Parsing and RepresentationRevise
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.
Configuration Validation and ChecksRevise
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.
Configuration Conversion and CompatibilityRevise
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.
Configuration Testing UtilitiesRevise
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.
State ManagementRevise
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.
Remote State ManagementRevise
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.
Local State ManagementRevise
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.
State File HandlingRevise
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.
Remote Backend IntegrationRevise
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:
Remote Backend Configuration and SetupRevise
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.
Remote Backend OperationsRevise
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:
Remote Backend State ManagementRevise
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.
Terraform Cloud IntegrationRevise
References: internal/cloud
The …/cloud
directory contains the core functionality for the Terraform Cloud backend implementation. The main components are:
Terraform Enterprise IntegrationRevise
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.
Terraform OperationsRevise
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.
Planning and Applying Terraform ConfigurationsRevise
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.
Terraform Context and ExecutionRevise
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.
Terraform Import and InputRevise
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.
Terraform Hooks and CallbacksRevise
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.
Terraform Testing UtilitiesRevise
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.
Command-Line InterfaceRevise
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.
Argument ParsingRevise
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.
Output FormattingRevise
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.
State ManagementRevise
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.
Provider IntegrationRevise
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.
Cloud IntegrationRevise
References: terraform
The …/cloud
package provides the core functionality for integrating with Terraform Cloud and Terraform Enterprise. The key components in this package are:
End-to-End TestingRevise
References: internal/command/e2etest
The key implementation details in the …/e2etest
directory are:
Legacy ComponentsRevise
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:
Legacy Resource ManagementRevise
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:
Legacy Helper PackageRevise
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.
Legacy Schema PackageRevise
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.
Legacy Hashcode PackageRevise
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.
Plugin ManagementRevise
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:
Plugin Discovery and ManagementRevise
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:
Plugin CommunicationRevise
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.
Plugin ConversionRevise
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.
Plugin TestingRevise
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.