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package git
import (
"errors"
"fmt"
"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"
)
var NoErrAlreadyUpToDate = errors.New("already up-to-date")
// Remote represents a connection to a remote repository
type Remote struct {
c *config.RemoteConfig
s Storage
// cache fields, there during the connection is open
upSrv common.GitUploadPackService
upInfo *common.GitUploadPackInfo
}
func newRemote(s Storage, c *config.RemoteConfig) *Remote {
return &Remote{s: s, c: c}
}
// Config return the config
func (r *Remote) Config() *config.RemoteConfig {
return r.c
}
// Connect with the endpoint
func (r *Remote) Connect() error {
if err := r.connectUploadPackService(); err != nil {
return err
}
return r.retrieveUpInfo()
}
func (r *Remote) connectUploadPackService() error {
endpoint, err := common.NewEndpoint(r.c.URL)
if err != nil {
return err
}
r.upSrv, err = clients.NewGitUploadPackService(endpoint)
if err != nil {
return err
}
return r.upSrv.Connect()
}
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(o *FetchOptions) (err error) {
if err := o.Validate(); err != nil {
return err
}
if len(o.RefSpecs) == 0 {
o.RefSpecs = r.c.Fetch
}
refs, err := r.getWantedReferences(o.RefSpecs)
if err != nil {
return err
}
if len(refs) == 0 {
return NoErrAlreadyUpToDate
}
req, err := r.buildRequest(r.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(reader); err != nil {
return err
}
return r.updateLocalReferenceStorage(o.RefSpecs, refs)
}
func (r *Remote) getWantedReferences(spec []config.RefSpec) ([]*core.Reference, error) {
var refs []*core.Reference
return refs, r.Refs().ForEach(func(ref *core.Reference) error {
if ref.Type() != core.HashReference {
return nil
}
if !config.MatchAny(spec, ref.Name()) {
return nil
}
_, err := r.s.ObjectStorage().Get(core.CommitObject, ref.Hash())
if err == core.ErrObjectNotFound {
refs = append(refs, ref)
return nil
}
return err
})
}
func (r *Remote) buildRequest(
s core.ReferenceStorage, o *FetchOptions, 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(reader io.Reader) error {
stream := packfile.NewStream(reader)
d := packfile.NewDecoder(stream)
return d.Decode(r.s.ObjectStorage())
}
func (r *Remote) updateLocalReferenceStorage(specs []config.RefSpec, refs []*core.Reference) error {
for _, ref := range refs {
for _, spec := range specs {
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 := r.s.ReferenceStorage().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
}
// Disconnect from the remote and save the config
func (r *Remote) Disconnect() error {
r.upInfo = nil
return r.upSrv.Disconnect()
}
func (r *Remote) String() string {
fetch := r.c.URL
push := r.c.URL
return fmt.Sprintf("%s\t%s (fetch)\n%[1]s\t%s (push)", r.c.Name, fetch, push)
}
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