storagemigration

type Options struct {
	// To is the target storage scheme: config.SchemeS3 or config.SchemeSwift.
	To string
	// DryRun reports source content without blocking the instance, copying,
	// verifying the target, or switching backends, including with FlagOnly.
	DryRun bool
	// FlagOnly switches to an already-populated target without copying.
	FlagOnly bool
	// Force acknowledges that FlagOnly may discard writes made since cutover.
	Force bool
	// PurgeSource deletes the source backend's objects after a successful
	// flip. It is a best-effort cleanup performed once the instance is
	// already fully served from the target: a failure here does not revert
	// the flip.
	//
	// If To already equals the instance's current storage scheme,
	// PurgeSource switches Migrate into purge-only mode: nothing is copied,
	// verified, or flipped, and only the OTHER backend's leftover data for
	// this instance is deleted. This is what makes a deferred reclaim
	// (running --purge-source well after the flip, or retrying an inline
	// purge that failed) possible.
	PurgeSource bool
}

type Report struct {
	Files        int
	Versions     int
	Bytes        int64
	AvatarCopied bool
}