DeriveComponentSideInfo tries to construct a ComponentSideInfo for the given component using its digest to fetch the relevant assertions.

DeriveSideInfo tries to construct a SideInfo for the given snap using its digest to fetch the relevant snap assertions.

MakeSeedAssertionFetcher makes a SeedAssertionFetcher using newFetcher which can build a base Fetcher with an additional save function, to capture assertion references.

MockManifest is stricly for unit tests, do not use for non-test code.

New returns a Writer to write a seed for the given model and using the given Options.

ReadManifest reads a seed.manifest previously generated by Manifest.Write and returns a new Manifest structure reflecting the contents.

Represents the validation-sets and snaps that are used to build an image seed.

ManifestSnapRevision represents a snap revision as noted in the seed manifest.

ManifestValidationSet represents a validation set as noted in the seed manifest.

Options holds the options for a Writer.

OptionsComponent represents an options-referred snap with its option values.

OptionsSnap represents an options-referred snap with its option values.

SeedComponent holds details of a component being added to a seed.

SeedSnap holds details of a snap being added to a seed.

SystemAlreadyExistsError is an error returned when given seed system already exists.

Downloaded must be passed an AssertsFetchFunc responsible for fetching or retrieving snap assertions when applicable.

SeedAssertionFetcher is a Fetcher which is designed to help with the fetching of assertions during seeding.

An AssertsFetchFunc should fetch appropriate assertions for the snap sn, it can take into account format constraints caused by the given systemSnap and kernelSnap if set.

A NewFetcherFunc can build a Fetcher saving to an (implicit) database and also calling the given additional save function.