compare

Documentation

Index

• func AllChunkSums(lister drive.ChunkLister) ([][]byte, error)
• func Equal(a, b drive.Client) (bool, error)
• func GetDelta(a, b drive.Client) (Delta, Delta, error)
• type Delta

Functions

func AllChunkSums

func AllChunkSums(lister drive.ChunkLister) ([][]byte, error)

AllChunkSums iterates lister. It gathers and returns all of the sums.

Nb: It is intended only for use on relatively small Shade repositorites. Depending on the client, it may consume a lot of ram and take a very long time to run.

func Equal

func Equal(a, b drive.Client) (bool, error)

Equal returns true if client a and b return the same sums via ListFiles and their ChunkLister interface.

See the disclaimers for GetDelta, which this is a thin veneer on top of.

func GetDelta

func GetDelta(a, b drive.Client) (Delta, Delta, error)

GetDelta iterates the files and chunks in two drive clients, and returns two Delta structs, containing slices of files and chunks. The return values are:

• files and chunks that a has that b does not
• files and chunks that b has that a does not
• an error, if one was encountered

Nb: This is intended only for use on relatively small Shade repositorites, primarily for testing. Depending on the client, it may consume a lot of ram and take a very long time to run.

Nb: it does not validate the clients contain the same actual bytes, it trusts the sums reported by ListFiles and the ChunkLister interface.

Types

type Delta

type Delta struct {
	Files  [][]byte
	Chunks [][]byte
}

Delta describes the extra file and chunk sums known to one client, which are not known to the other.