`idf_component.yml` Manifest File

Use the idf_component.yml manifest file to describe the component and its dependencies. The manifest file is located in the root directory of the component.

The manifest file supports the following objects:

This field is optional, if you don't have any examples outside of the examples directory. The ESP Component Registry will automatically discover examples in the examples directory and its subdirectories.

Example:

examples:
  - path: custom_example_path_1
  - path: custom_example_path_2
  # - path: examples/foo  # no need to be listed if the example is under "examples" folder

`url`

The component website.

This field is optional, but highly recommended.

If not specified, a warning message will appear when the component is uploaded to the registry.

Example:

url: "https://example.com"

`repository`

The URL of the component repository. The repository URL has to be a valid Git remote URL.

This field is optional, but highly recommended.

Example:

repository: "https://example.com/component.git"

`repository_info`

The additional information of the repository.

This field is optional. But when it's set, repository field must be set as well.

If your component is not in the root of the repository, specify the path to the component in the path field.

repository: "https://example.com/component.git"
repository_info:
  path: "path/to/component"

You may also put a Git Commit SHA of the component you intend to use in the commit_sha field.

repository_info:
  commit_sha: "1234567890abcdef1234567890abcdef12345678"

Can be passed as an argument to the compote component upload --commit-sha [commit_sha] command.

Both path and commit_sha sub-fields are optional.

`documentation`

The URL of the component documentation.

This field is optional.

Example:

documentation: "https://docs.example.com"

`issues`

The URL of the component issue tracker.

This field is optional.

Example:

issues: "https://issues.example.com"

`discussion`

The URL of the component discussion forum or chat.

This field is optional.

Example:

discussion: "https://chat.example.com"

Component Dependencies 

Use the dependencies field to specify dependencies. The field is a dictionary of dependencies, where the key is the name of the dependency.

Get familiar with the following sections before defining dependencies:

Common Attributes for All Dependency Types
Environment variables
Conditional Dependencies.

Component manager supports several sources of dependencies:

Local Directory Dependencies
Git Dependencies
ESP Component Registry Dependencies
ESP-IDF Dependency

Warning

Local Directory Dependencies and Git Dependencies are not supported when uploading the component to the ESP Component Registry.

Common Attributes for All Dependency Types

The following attributes are supported for all types of dependencies.

These attributes are optional.

`require`

Specifies component visibility. Possible values:

private: This is the default value. The required component is added as a private dependency. This is equivalent to adding the component to the PRIV_REQUIRES argument of idf_component_register in the component's CMakeLists.txt file.
public: Sets the transient dependency. This is equivalent to adding the component to the REQUIRES argument of idf_component_register in the component's CMakeLists.txt file.
no: Can be used to only download the component but not add it as a requirement.

Example:

require: public
# require: private # by default

`matches`

A list of conditional dependencies that should be applied to the dependency. The dependency is only included when any of the if-clauses is true.

`rules`

A list of conditional dependencies that should be applied to the dependency. The dependency is only included when all of the if-clauses are true.

Conditional Dependencies

matches and rules attributes are specified to control the dependency inclusion. The dependency is only included when:

any of the if clauses in matches is true
all of the if clauses in rules are true

matches and rules are optional attributes. If they are omitted, the dependency is always included.

matches and rules support the same syntax. The field is a list of conditional dependencies. Each conditional dependency has an if field, and an optional version field.

`if`

The if field is a boolean expression that is evaluated to determine if the dependency should be included. An expression consists of three parts: left value, operator, and right value.

The left value could be

keyword idf_version: the version of ESP-IDF that is used to build the component
keyword target: the current target selected for the project
a string
environment variables

The right value could be

a string
a list of strings

The operator to compare with a string could be

<=
<
>=
>
~=
~
=
^
!=
==

The operator to compare with a list of strings could be

not in
in

To make a complex boolean expression, you can use nested parentheses with boolean operators && and ||.

dependencies:
  optional_component:
   version: "~1.0.0"
   rules:
     - if: "idf_version >=3.3,<5.0"
     - if: "target in [esp32, esp32c3]"
     # the above two conditions equals to
     - if: idf_version >=3.3,<5.0 && target in [esp32, esp32c3]

The left value of the if clause could be environment variables. If the environment variable is not set, an error will be raised.

One possible use-case is to test it in the CI/CD pipeline. For example:

dependencies:
  optional_component:
    matches:
      - if: "$TESTING_COMPONENT in [foo, bar]"

The dependency will only be included when the environment variable TESTING_COMPONENT is set to foo or bar.

`version` (if clause)

The version field is optional, and it could be either a specific version or a version range. The version specified here will override the version field of the dependency when the corresponding if clause is true.

For example,

dependencies:
  optional_component:
    matches:
      - if: "idf_version >=3.3"
        version: "~2.0.0"
      - if: "idf_version <3.3"
        version: "~1.0.0"

The optional_component will be included with version ~2.0.0 when the idf_version >=3.3, and it will be included with version ~1.0.0 when the idf_version <3.3.

Environment Variables

Warning

Environment variables are not allowed in manifests when uploading components to the ESP Component Registry.

You can use environment variables for the attributes that support them. The component manager will replace the environment variables with their values. Use the following syntax:

$VAR
${VAR}

If you need to use a literal dollar sign ($), escape it with another dollar sign: $$string.

Local Directory Dependencies

If you work on a component that is not yet published to the ESP Component Registry, you can add it as a dependency from a local directory. To specify a local dependency, at least one of the following attributes should be specified:

`path` (local)

The path to the local directory containing the dependency. Use can use paths relative to the to the idf_component.yml manifest file, or absolute paths.

This field supports environment variables.

Example:

dependencies:
  some_local_component:
     path: ../../projects/some_local_component

`override_path`

Use this field to use the local component instead of downloading it from the component registry, for example to define example projects inside components.

This field supports environment variables.

Example:

dependencies:
  some_local_component:
    override_path: ../../projects/some_local_component

Git Dependencies

You can add dependencies from a Git repository by specifying the following attributes:

`git`

The URL of the Git repository. The URL should be a valid Git remote URL or a path to the local Git repository.

This field is required when using Git dependencies

Example:

dependencies:
  some_git_component:
    git: /home/user/projects/some_git_component.git
    # git: https://gitlab.com/user/components.git # remote repository

This field supports environment variables. One possible use-case is providing authentication to Git repositories accessed through HTTPS:

dependencies:
 my_component:
   git: https://git:${ACCESS_TOKEN}@git.my_git.com/my_component.git

`path` (Git)

The path to the component in the Git repository. The path is relative to the root directory of the Git repository. If omitted, the root directory of the Git repository is used as the path to the component.

This field supports environment variables.

Example:

dependencies:
  # The component is located in /home/user/projects/some_git_component.git/some_git_component
  some_git_component:
    git: /home/user/projects/some_git_component.git
    path: some_git_component

`version` (Git)

The version of the dependency. The version of a Git dependency can be specified by any valid Git reference: a tag, a branch, or a commit hash.

If omitted, the default branch of the Git repository is used.

Example:

dependencies:
  some_git_component:
    git: /home/user/projects/some_git_component.git
    version: feature/test  # branch
    # version: v1.0.0  # tag
    # version: 1234567890abcdef1234567890abcdef12345678  # commit hash

ESP Component Registry Dependencies

If neither path, override_path, nor git attributes are specified, the component manager will try to resolve the dependency from the ESP Component Registry. Components in the ESP Component Registry are specified by their name in the namespace/component_name format.

Note

If you need to specify only the version field, you can use the following syntax:

dependencies:
   component_name: ">=1.0"

This is equivalent to:

dependencies:
   espressif/component_name:
      version: ">=1.0"

`version` (registry)

The version of the dependency.

This field is required and could be either a specific version or a version range.

Example:

dependencies:
  espressif/led_strip:
    version: ">=2.0"  # a version range
    # version: "2.0.0"  # a specific version

The default namespace for components in the ESP Component Registry is espressif. You can omit the namespace part for components in the default namespace:

dependencies:
   led_strip:
      version: ">=2.0"

`pre_release`

A boolean that indicates if the prerelease versions of the dependency should be used.

This field is optional.

Example:

dependencies:
  espressif/led_strip:
    version: ">=2.0"
    pre_release: true

By default, the prerelease versions are ignored. You can include the prerelease field in the version string to specify the prerelease version:

dependencies:
  espressif/led_strip:
    version: ">=2.0-beta.1"

`registry_url`

The URL of the ESP Component Registry. By default, this URL is https://components.espressif.com.

If you are uploading to the staging registry, you can set the URL to https://components-staging.espressif.com to indicate that dependencies should be resolved from the staging registry instead of the main registry.

When uploading your component to the main registry, this URL should remain set to the default value: https://components.espressif.com. This ensures that all dependencies are resolved from the main registry.

ESP-IDF Dependency

Use the idf:version to specify the ESP-IDF version that the component is compatible with.

Use a specific version or a version range.

dependencies:
  idf:
    version: ">=5.0"

Shorthand syntax:

dependencies:
  idf: ">=5.0"

`idf_component.yml` Manifest File

Metadata Attributes 

`version`

`maintainers`

`description`

`license`

`tags`

`files`

`examples`

`url`

`repository`

`repository_info`

`documentation`

`issues`

`discussion`

Component Dependencies 

Common Attributes for All Dependency Types

`require`

`matches`

`rules`

Conditional Dependencies

`if`

`version` (if clause)

Environment Variables

Local Directory Dependencies

`path` (local)

`override_path`

Git Dependencies

`git`

`path` (Git)

`version` (Git)

ESP Component Registry Dependencies

`version` (registry)

`pre_release`

`registry_url`

ESP-IDF Dependency

idf_component.yml Manifest File

Common Attributes for All Dependency Types

require

matches

rules

Conditional Dependencies

if

version (if clause)

Environment Variables

Local Directory Dependencies

path (local)

override_path

Git Dependencies

ESP Component Registry Dependencies

version (registry)

pre_release

registry_url

ESP-IDF Dependency

`idf_component.yml` Manifest File

`require`

`matches`

`rules`

`if`

`version` (if clause)

`path` (local)

`override_path`

`version` (registry)

`pre_release`

`registry_url`