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type Config struct {
	Sources []Source `yaml:"sources" validate:"required,dive"`
}

type Source struct {
	Name   string        `yaml:"name"             validate:"required"`
	Type   string        `yaml:"type"             validate:"required,oneof=github"`
	GitHub *gitHubSource `yaml:"github,omitempty" validate:"required_if=Type github"`
}

type Update struct {
	Revision string
	Path     string
	BlobSHA  string
}