320e9b6057
ci-via-github-actions
203 lines
5.2 KiB
Go
203 lines
5.2 KiB
Go
package packp
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import (
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"fmt"
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"sort"
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"strings"
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"gopkg.in/src-d/go-git.v4/plumbing"
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"gopkg.in/src-d/go-git.v4/plumbing/protocol/packp/capability"
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"gopkg.in/src-d/go-git.v4/plumbing/storer"
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"gopkg.in/src-d/go-git.v4/storage/memory"
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)
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// AdvRefs values represent the information transmitted on an
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// advertised-refs message. Values from this type are not zero-value
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// safe, use the New function instead.
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type AdvRefs struct {
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// Prefix stores prefix payloads.
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//
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// When using this message over (smart) HTTP, you have to add a pktline
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// before the whole thing with the following payload:
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//
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// '# service=$servicename" LF
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//
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// Moreover, some (all) git HTTP smart servers will send a flush-pkt
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// just after the first pkt-line.
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//
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// To accommodate both situations, the Prefix field allow you to store
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// any data you want to send before the actual pktlines. It will also
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// be filled up with whatever is found on the line.
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Prefix [][]byte
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// Head stores the resolved HEAD reference if present.
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// This can be present with git-upload-pack, not with git-receive-pack.
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Head *plumbing.Hash
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// Capabilities are the capabilities.
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Capabilities *capability.List
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// References are the hash references.
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References map[string]plumbing.Hash
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// Peeled are the peeled hash references.
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Peeled map[string]plumbing.Hash
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// Shallows are the shallow object ids.
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Shallows []plumbing.Hash
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}
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// NewAdvRefs returns a pointer to a new AdvRefs value, ready to be used.
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func NewAdvRefs() *AdvRefs {
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return &AdvRefs{
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Prefix: [][]byte{},
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Capabilities: capability.NewList(),
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References: make(map[string]plumbing.Hash),
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Peeled: make(map[string]plumbing.Hash),
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Shallows: []plumbing.Hash{},
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}
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}
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func (a *AdvRefs) AddReference(r *plumbing.Reference) error {
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switch r.Type() {
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case plumbing.SymbolicReference:
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v := fmt.Sprintf("%s:%s", r.Name().String(), r.Target().String())
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a.Capabilities.Add(capability.SymRef, v)
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case plumbing.HashReference:
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a.References[r.Name().String()] = r.Hash()
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default:
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return plumbing.ErrInvalidType
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}
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return nil
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}
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func (a *AdvRefs) AllReferences() (memory.ReferenceStorage, error) {
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s := memory.ReferenceStorage{}
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if err := a.addRefs(s); err != nil {
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return s, plumbing.NewUnexpectedError(err)
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}
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return s, nil
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}
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func (a *AdvRefs) addRefs(s storer.ReferenceStorer) error {
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for name, hash := range a.References {
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ref := plumbing.NewReferenceFromStrings(name, hash.String())
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if err := s.SetReference(ref); err != nil {
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return err
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}
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}
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if a.supportSymrefs() {
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return a.addSymbolicRefs(s)
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}
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return a.resolveHead(s)
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}
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// If the server does not support symrefs capability,
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// we need to guess the reference where HEAD is pointing to.
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//
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// Git versions prior to 1.8.4.3 has an special procedure to get
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// the reference where is pointing to HEAD:
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// - Check if a reference called master exists. If exists and it
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// has the same hash as HEAD hash, we can say that HEAD is pointing to master
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// - If master does not exists or does not have the same hash as HEAD,
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// order references and check in that order if that reference has the same
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// hash than HEAD. If yes, set HEAD pointing to that branch hash
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// - If no reference is found, throw an error
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func (a *AdvRefs) resolveHead(s storer.ReferenceStorer) error {
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if a.Head == nil {
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return nil
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}
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ref, err := s.Reference(plumbing.ReferenceName(plumbing.Master))
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// check first if HEAD is pointing to master
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if err == nil {
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ok, err := a.createHeadIfCorrectReference(ref, s)
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if err != nil {
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return err
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}
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if ok {
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return nil
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}
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}
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if err != nil && err != plumbing.ErrReferenceNotFound {
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return err
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}
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// From here we are trying to guess the branch that HEAD is pointing
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refIter, err := s.IterReferences()
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if err != nil {
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return err
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}
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var refNames []string
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err = refIter.ForEach(func(r *plumbing.Reference) error {
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refNames = append(refNames, string(r.Name()))
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return nil
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})
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if err != nil {
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return err
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}
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sort.Strings(refNames)
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var headSet bool
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for _, refName := range refNames {
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ref, err := s.Reference(plumbing.ReferenceName(refName))
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if err != nil {
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return err
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}
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ok, err := a.createHeadIfCorrectReference(ref, s)
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if err != nil {
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return err
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}
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if ok {
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headSet = true
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break
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}
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}
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if !headSet {
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return plumbing.ErrReferenceNotFound
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}
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return nil
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}
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func (a *AdvRefs) createHeadIfCorrectReference(
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reference *plumbing.Reference,
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s storer.ReferenceStorer) (bool, error) {
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if reference.Hash() == *a.Head {
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headRef := plumbing.NewSymbolicReference(plumbing.HEAD, reference.Name())
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if err := s.SetReference(headRef); err != nil {
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return false, err
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}
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return true, nil
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}
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return false, nil
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}
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func (a *AdvRefs) addSymbolicRefs(s storer.ReferenceStorer) error {
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for _, symref := range a.Capabilities.Get(capability.SymRef) {
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chunks := strings.Split(symref, ":")
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if len(chunks) != 2 {
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err := fmt.Errorf("bad number of `:` in symref value (%q)", symref)
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return plumbing.NewUnexpectedError(err)
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}
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name := plumbing.ReferenceName(chunks[0])
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target := plumbing.ReferenceName(chunks[1])
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ref := plumbing.NewSymbolicReference(name, target)
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if err := s.SetReference(ref); err != nil {
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return nil
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}
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}
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return nil
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}
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func (a *AdvRefs) supportSymrefs() bool {
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return a.Capabilities.Supports(capability.SymRef)
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}
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