// validateFullConfig validates a fully-constructed storage config,
// combining the user-specified config and any internally specified
// config.
func (p *rootfsProvider) validateFullConfig(cfg *storage.Config) error {
if err := p.ValidateConfig(cfg); err != nil {
return err
}
storageDir, ok := cfg.ValueString(storage.ConfigStorageDir)
if !ok || storageDir == "" {
return errors.New("storage directory not specified")
}
return nil
}
// FilesystemSource is defined on the Provider interface.
func (p *rootfsProvider) FilesystemSource(environConfig *config.Config, sourceConfig *storage.Config) (storage.FilesystemSource, error) {
if err := p.validateFullConfig(sourceConfig); err != nil {
return nil, err
}
// storageDir is validated by validateFullConfig.
storageDir, _ := sourceConfig.ValueString(storage.ConfigStorageDir)
return &rootfsFilesystemSource{
&osDirFuncs{p.run},
p.run,
storageDir,
}, nil
}
// VolumeSource is defined on the Provider interface.
func (lp *loopProvider) VolumeSource(sourceConfig *storage.Config) (storage.VolumeSource, error) {
if err := lp.validateFullConfig(sourceConfig); err != nil {
return nil, err
}
// storageDir is validated by validateFullConfig.
storageDir, _ := sourceConfig.ValueString(storage.ConfigStorageDir)
return &loopVolumeSource{
&osDirFuncs{lp.run},
lp.run,
storageDir,
}, nil
}