plumbing: commitgraph, fix types and handle commit-graph-chains

Unfortunately the original variant makes some incorrect typing
assumptions about commit-graphs which make handling graph chains
difficult to do correctly. This creates a new subpackage and deprecates
the old one. It then adds support commit graph chains.

Signed-off-by: Andrew Thornton <art27@cantab.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/plumbing/format/commitgraph/commitgraph.go b/plumbing/format/commitgraph/commitgraph.go
index 3d59323..e772d26 100644
--- a/plumbing/format/commitgraph/commitgraph.go
+++ b/plumbing/format/commitgraph/commitgraph.go
@@ -8,6 +8,9 @@ import (
 

 // CommitData is a reduced representation of Commit as presented in the commit graph

 // file. It is merely useful as an optimization for walking the commit graphs.

+//

+// Deprecated: This package uses the wrong types for Generation and Index in CommitData.

+// Use the v2 package instead.

 type CommitData struct {

 	// TreeHash is the hash of the root tree of the commit.

 	TreeHash plumbing.Hash

@@ -24,6 +27,9 @@ type CommitData struct {
 

 // Index represents a representation of commit graph that allows indexed

 // access to the nodes using commit object hash

+//

+// Deprecated: This package uses the wrong types for Generation and Index in CommitData.

+// Use the v2 package instead.

 type Index interface {

 	// GetIndexByHash gets the index in the commit graph from commit hash, if available

 	GetIndexByHash(h plumbing.Hash) (int, error)