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# Flipper Application Manifests (.fam)
# Flipper Application Manifests (.fam) {#app_manifests}
All components of Flipper Zero firmware — services, user applications, and system settings — are developed independently. Each component has a build system manifest file named `application.fam`, which defines the basic properties of that component and its relations to other parts of the system.
When building firmware, **`fbt`** collects all application manifests and processes their dependencies. Then it builds only those components referenced in the current build configuration. See [FBT docs](./fbt.md#firmware-application-set) for details on build configurations.
When building firmware, `fbt` collects all application manifests and processes their dependencies. Then it builds only those components referenced in the current build configuration. See [FBT docs](fbt.md) for details on build configurations.
## Application definition
A firmware component's properties are declared in a Python code snippet, forming a call to the `App()` function with various parameters.
Only two parameters are mandatory: **_appid_** and **_apptype_**. Others are optional and may only be meaningful for certain application types.
Only two parameters are mandatory: **appid** and **apptype**. Others are optional and may only be meaningful for certain application types.
### Parameters
@@ -34,7 +34,7 @@ Only two parameters are mandatory: **_appid_** and **_apptype_**. Others are opt
- **flags**: internal flags for system apps. Do not use.
- **cdefines**: C preprocessor definitions to declare globally for other apps when the current application is included in the active build configuration. **For external applications**: specified definitions are used when building the application itself.
- **requires**: list of application IDs to include in the build configuration when the current application is referenced in the list of applications to build.
- **conflicts**: list of application IDs with which the current application conflicts. If any of them is found in the constructed application list, **`fbt`** will abort the firmware build process.
- **conflicts**: list of application IDs with which the current application conflicts. If any of them is found in the constructed application list, `fbt` will abort the firmware build process.
- **provides**: functionally identical to **_requires_** field.
- **stack_size**: stack size in bytes to allocate for an application on its startup. Note that allocating a stack too small for an app to run will cause a system crash due to stack overflow, and allocating too much stack space will reduce usable heap memory size for apps to process data. _Note: you can use `ps` and `free` CLI commands to profile your app's memory usage._
- **icon**: animated icon name from built-in assets to be used when building the app as a part of the firmware.
@@ -55,11 +55,11 @@ The following parameters are used only for [FAPs](./AppsOnSDCard.md):
- **fap_description**: string, may be empty. Short application description.
- **fap_author**: string, may be empty. Application's author.
- **fap_weburl**: string, may be empty. Application's homepage.
- **fap_icon_assets**: string. If present, it defines a folder name to be used for gathering image assets for this application. These images will be preprocessed and built alongside the application. See [FAP assets](./AppsOnSDCard.md#fap-assets) for details.
- **fap_extbuild**: provides support for parts of application sources to be built by external tools. Contains a list of `ExtFile(path="file name", command="shell command")` definitions. **`fbt`** will run the specified command for each file in the list.
- **fap_icon_assets**: string. If present, it defines a folder name to be used for gathering image assets for this application. These images will be preprocessed and built alongside the application. See [FAP assets](AppsOnSDCard.md) for details.
- **fap_extbuild**: provides support for parts of application sources to be built by external tools. Contains a list of `ExtFile(path="file name", command="shell command")` definitions. `fbt` will run the specified command for each file in the list.
- **fal_embedded**: boolean, default `False`. Applies only to PLUGIN type. If `True`, the plugin will be embedded into host application's .fap file as a resource and extracted to `apps_assets/APPID` folder on its start. This allows plugins to be distributed as a part of the host application.
Note that commands are executed at the firmware root folder, and all intermediate files must be placed in an application's temporary build folder. For that, you can use pattern expansion by **`fbt`**: `${FAP_WORK_DIR}` will be replaced with the path to the application's temporary build folder, and `${FAP_SRC_DIR}` will be replaced with the path to the application's source folder. You can also use other variables defined internally by **`fbt`**.
Note that commands are executed at the firmware root folder, and all intermediate files must be placed in an application's temporary build folder. For that, you can use pattern expansion by `fbt`: `${FAP_WORK_DIR}` will be replaced with the path to the application's temporary build folder, and `${FAP_SRC_DIR}` will be replaced with the path to the application's source folder. You can also use other variables defined internally by `fbt`.
Example for building an app from Rust sources:
@@ -77,12 +77,12 @@ Example for building an app from Rust sources:
Library sources must be placed in a subfolder of the `lib` folder within the application's source folder.
Each library is defined as a call to the `Lib()` function, accepting the following parameters:
- **name**: name of the library's folder. Required.
- **fap_include_paths**: list of the library's relative paths to add to the parent fap's include path list. The default value is `["."]`, meaning the library's source root.
- **sources**: list of filename masks to be used for gathering include files for this library. Paths are relative to the library's source root. The default value is `["*.c*"]`.
- **cflags**: list of additional compiler flags to be used for building this library. The default value is `[]`.
- **cdefines**: list of additional preprocessor definitions to be used for building this library. The default value is `[]`.
- **cincludes**: list of additional include paths to be used for building this library. Paths are relative to the application's root. This can be used for providing external search paths for this library's code — for configuration headers. The default value is `[]`.
- **name**: name of the library's folder. Required.
- **fap_include_paths**: list of the library's relative paths to add to the parent fap's include path list. The default value is `["."]`, meaning the library's source root.
- **sources**: list of filename masks to be used for gathering include files for this library. Paths are relative to the library's source root. The default value is `["*.c*"]`.
- **cflags**: list of additional compiler flags to be used for building this library. The default value is `[]`.
- **cdefines**: list of additional preprocessor definitions to be used for building this library. The default value is `[]`.
- **cincludes**: list of additional include paths to be used for building this library. Paths are relative to the application's root. This can be used for providing external search paths for this library's code — for configuration headers. The default value is `[]`.
Example for building an app with a private library:
@@ -105,12 +105,12 @@ Example for building an app with a private library:
],
```
For that snippet, **`fbt`** will build 2 libraries: one from sources in `lib/mbedtls` folder and another from sources in the `lib/loclass` folder. For the `mbedtls` library, **`fbt`** will add `lib/mbedtls/include` to the list of include paths for the application and compile only the files specified in the `sources` list. Additionally, **`fbt`** will enable `MBEDTLS_ERROR_C` preprocessor definition for `mbedtls` sources.
For the `loclass` library, **`fbt`** will add `lib/loclass` to the list of the include paths for the application and build all sources in that folder. Also, **`fbt`** will disable treating compiler warnings as errors for the `loclass` library, which can be useful when compiling large 3rd-party codebases.
For that snippet, `fbt` will build 2 libraries: one from sources in `lib/mbedtls` folder and another from sources in the `lib/loclass` folder. For the `mbedtls` library, `fbt` will add `lib/mbedtls/include` to the list of include paths for the application and compile only the files specified in the `sources` list. Additionally, `fbt` will enable `MBEDTLS_ERROR_C` preprocessor definition for `mbedtls` sources.
For the `loclass` library, `fbt` will add `lib/loclass` to the list of the include paths for the application and build all sources in that folder. Also, `fbt` will disable treating compiler warnings as errors for the `loclass` library, which can be useful when compiling large 3rd-party codebases.
Both libraries will be linked with the application.
## `.fam` file contents
## .fam file contents
The `.fam` file contains one or more application definitions. For example, here's a part of `applications/service/bt/application.fam`: