Function resolveTagRef

internal/skills/discovery/discovery.go:276–307

resolveTagRef looks up a tag by short name and returns a fully qualified ref. For annotated tags, the tag object is dereferenced to obtain the commit SHA.

(client *api.Client, host, owner, repo, tag string)

// resolveTagRef looks up a tag by short name and returns a fully qualified ref.
// For annotated tags, the tag object is dereferenced to obtain the commit SHA.
func resolveTagRef(client *api.Client, host, owner, repo, tag string) (*ResolvedRef, error) {
	tagPath, err := safeurl.JoinPath("repos", owner, repo, "git", "ref", fmt.Sprintf("tags/%s", tag))
	if err != nil {
		return nil, err
	}
	var refResp struct {
		Object struct {
			SHA  string `json:"sha"`
			Type string `json:"type"`
		} `json:"object"`
	}
	if err := client.REST(host, "GET", tagPath.String(), nil, &refResp); err != nil {
		return nil, fmt.Errorf("tag %q not found in %s/%s: %w", tag, owner, repo, err)
	}
	sha := refResp.Object.SHA
	if refResp.Object.Type == "tag" {
		derefPath, err := safeurl.JoinPath("repos", owner, repo, "git", "tags", sha)
		if err != nil {
			return nil, err
		}
		var tagResp struct {
			Object struct {
				SHA string `json:"sha"`
			} `json:"object"`
		}
		if err := client.REST(host, "GET", derefPath.String(), nil, &tagResp); err != nil {
			return nil, fmt.Errorf("could not dereference annotated tag %q: %w", tag, err)
		}
		sha = tagResp.Object.SHA
	}
	return &ResolvedRef{Ref: "refs/tags/" + tag, SHA: sha}, nil
}

// resolveBranchRef looks up a branch by short name and returns a fully qualified ref.
func resolveBranchRef(client *api.Client, host, owner, repo, branch string) (*ResolvedRef, error) {