file_handling.md

Fetch

Fetching an Atomic App means to download the metadata files: artifacts and sample answerfile for an Atomic App. By default, it downloads the metadata files for the atomicapp to a directory of the form /var/lib/atomicapp/<atomic app name>-<uuid>. If needed, you can also specify a target directory to download the metadata for the Atomic App using the --destination option.

Developing and Debugging

Image developers may run the root container and point to a Nulecule directory on the local system.

Directories

• /var/lib/atomicapp/<atomic app name>-<uuid>: This is where an Atomic App and it's dependencies are fetched when fetching or running the Atomic App, unless, a specific destination is specified.
• /var/lib/atomicapp/<atomic app name>-<uuid>/external: External Atomic Apps, if any, for the given Atomic App are fetched into external directory inside the directory of the Atomic App, during, fetching the Atomic App with dependencies or running the Atomic App.

Artifact path

Local path to an artifact file or a directory containing artifact files as its immediate children.

Runtime answers file

When running an Atomic App, it asks the users for missing values for parameters defined in the Atomic App and it's child Atomic Apps. This aggregated answers data is used to run the Atomic App, and is dumped to a file: answers.conf.gen in the Atomic App's directory, to be used later when stopping the Atomic App.

Rendered artifact files

Artifact files are rendered with runtime answers data along side the original artifact files, but with the filenames prefixed with a . (dot), to make them hidden.