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package git
import (
"io"
"gopkg.in/src-d/go-git.v4/clients"
"gopkg.in/src-d/go-git.v4/clients/common"
"gopkg.in/src-d/go-git.v4/config"
"gopkg.in/src-d/go-git.v4/core"
"gopkg.in/src-d/go-git.v4/formats/packfile"
)
// Remote represents a connection to a remote repository
type Remote struct {
config *config.RemoteConfig
Name string
Endpoint common.Endpoint
Auth common.AuthMethod
upSrv common.GitUploadPackService
upInfo *common.GitUploadPackInfo
}
// NewRemote returns a new Remote, using as client http.DefaultClient
func NewRemote(name, url string) (*Remote, error) {
return NewAuthenticatedRemote(name, url, nil)
}
// NewAuthenticatedRemote returns a new Remote using the given AuthMethod, using as
// client http.DefaultClient
func NewAuthenticatedRemote(name, url string, auth common.AuthMethod) (*Remote, error) {
endpoint, err := common.NewEndpoint(url)
if err != nil {
return nil, err
}
upSrv, err := clients.NewGitUploadPackService(endpoint)
if err != nil {
return nil, err
}
return &Remote{
Endpoint: endpoint,
Name: name,
Auth: auth,
upSrv: upSrv,
}, nil
}
// Connect with the endpoint
func (r *Remote) Connect() error {
var err error
if r.Auth == nil {
err = r.upSrv.Connect()
} else {
err = r.upSrv.ConnectWithAuth(r.Auth)
}
if err != nil {
return err
}
return r.retrieveUpInfo()
}
func (r *Remote) retrieveUpInfo() error {
var err error
if r.upInfo, err = r.upSrv.Info(); err != nil {
return err
}
return nil
}
// Info returns the git-upload-pack info
func (r *Remote) Info() *common.GitUploadPackInfo {
return r.upInfo
}
// Capabilities returns the remote capabilities
func (r *Remote) Capabilities() *common.Capabilities {
return r.upInfo.Capabilities
}
// Fetch returns a reader using the request
func (r *Remote) Fetch(s core.Storage, o *RemoteFetchOptions) (err error) {
if err := o.Validate(); err != nil {
return err
}
refs, err := r.getWantedReferences(o.RefSpec)
if err != nil {
return err
}
req, err := r.buildRequest(s.ReferenceStorage(), o, refs)
if err != nil {
return err
}
reader, err := r.upSrv.Fetch(req)
if err != nil {
return err
}
defer checkClose(reader, &err)
if err := r.updateObjectStorage(s.ObjectStorage(), reader); err != nil {
return err
}
return r.updateLocalReferenceStorage(s.ReferenceStorage(), o.RefSpec, refs)
}
func (r *Remote) getWantedReferences(spec config.RefSpec) ([]*core.Reference, error) {
var refs []*core.Reference
return refs, r.Refs().ForEach(func(r *core.Reference) error {
if r.Type() != core.HashReference {
return nil
}
if spec.Match(r.Name()) {
refs = append(refs, r)
}
return nil
})
}
func (r *Remote) buildRequest(
s core.ReferenceStorage, o *RemoteFetchOptions, refs []*core.Reference,
) (*common.GitUploadPackRequest, error) {
req := &common.GitUploadPackRequest{}
req.Depth = o.Depth
for _, ref := range refs {
req.Want(ref.Hash())
}
i, err := s.Iter()
if err != nil {
return nil, err
}
err = i.ForEach(func(ref *core.Reference) error {
if ref.Type() != core.HashReference {
return nil
}
req.Have(ref.Hash())
return nil
})
return req, err
}
func (r *Remote) updateObjectStorage(s core.ObjectStorage, reader io.Reader) error {
stream := packfile.NewStream(reader)
d := packfile.NewDecoder(stream)
return d.Decode(s)
}
func (r *Remote) updateLocalReferenceStorage(
local core.ReferenceStorage, spec config.RefSpec, refs []*core.Reference,
) error {
for _, ref := range refs {
if !spec.Match(ref.Name()) {
continue
}
if ref.Type() != core.HashReference {
continue
}
name := spec.Dst(ref.Name())
n := core.NewHashReference(name, ref.Hash())
if err := local.Set(n); err != nil {
return err
}
}
return nil
}
// Head returns the Reference of the HEAD
func (r *Remote) Head() *core.Reference {
return r.upInfo.Head()
}
// Ref returns the Hash pointing the given refName
func (r *Remote) Ref(name core.ReferenceName, resolved bool) (*core.Reference, error) {
if resolved {
return core.ResolveReference(r.upInfo.Refs, name)
}
return r.upInfo.Refs.Get(name)
}
// Refs returns a map with all the References
func (r *Remote) Refs() core.ReferenceIter {
i, _ := r.upInfo.Refs.Iter()
return i
}
func (r *Remote) Disconnect() error {
r.upInfo = nil
return r.upSrv.Disconnect()
}
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