go-git-annex-external

go-git-annex-external is a library for creating git-annex external special remotes and external backends using Go. Clients of the library are insulated from the specifics of the communication protocols and only need to implement individual operations (fulfilling particular Go interfaces) to produce external remotes and backends.

Both protocols as they stand at the time of writing are fully supported, including (for external special remotes) the info extension, the async extension, and the simple export interface.

External special remotes

• API documentation
• protocol documentation

See the cmd/git-annex-remote-local subdirectory for a functioning example. Here's a minimal compilable skeleton:

package main

import "github.com/dzhu/go-git-annex-external/remote"

type minimalRemote struct{}

func (*minimalRemote) Init(a remote.Annex) error                        { return nil }
func (*minimalRemote) Prepare(a remote.Annex) error                     { return nil }
func (*minimalRemote) Store(a remote.Annex, key, file string) error     { return nil }
func (*minimalRemote) Retrieve(a remote.Annex, key, file string) error  { return nil }
func (*minimalRemote) Present(a remote.Annex, key string) (bool, error) { return false, nil }
func (*minimalRemote) Remove(a remote.Annex, key string) error          { return nil }

func main() {
    remote.Run(&minimalRemote{})
}

External backends

• API documentation
• protocol documentation

See the cmd/git-annex-backend-XSHORTHASH subdirectory for a functioning example. Here's a minimal compilable skeleton:

package main

import "github.com/dzhu/go-git-annex-external/backend"

type minimalBackend struct{}

func (*minimalBackend) GenKey(a backend.Annex, file string) (string, bool, error) {
    return "", false, nil
}
func (*minimalBackend) IsStable(a backend.Annex) bool { return false }

func main() {
    backend.Run(&minimalBackend{})
}