containers/image/storage has a dependency on libdevmapper.so; having this in its own package allows downstream users to import it if they want to use it, but means they can also avoid importing it if they don't want to add this dependency.

Chmod changes file permissions.

Chown changes file ownership.

CopyThing copies either a dir or file to the target.

DirCopy copies a whole directory recursively.

FindFiles searches for paths matching a particular regex under a given folder.

NewDAG creates a new DAG.

Vertex in the graph has the entry of <key, value> for a component.

Graph is collection of vertices and edges between them.

Key for a component.

Value is the actual component object.