Function fetchCommitSHA

pkg/cmd/extension/http.go:169–195

fetchCommitSHA finds full commit SHA from a target ref in a repo

(httpClient *http.Client, baseRepo ghrepo.Interface, targetRef string)

// fetchCommitSHA finds full commit SHA from a target ref in a repo
func fetchCommitSHA(httpClient *http.Client, baseRepo ghrepo.Interface, targetRef string) (string, error) {
	path, err := safeurl.JoinPath("repos", baseRepo.RepoOwner(), baseRepo.RepoName(), "commits", targetRef)
	if err != nil {
		return "", err
	}

	// The response body is a bare SHA rather than JSON, so Request is used instead of REST.
	// TODO(api-client-rollout)
	// This line of code is part of a mechanical roll out of the api client.
	// As a follow up, consider whether the api client can be injected to this call site, rather than constructed
	resp, err := api.NewClientFromHTTP(httpClient).Request(baseRepo.RepoHost(), http.MethodGet, path.String(), nil,
		api.WithHeader("Accept", "application/vnd.github.v3.sha"))
	if err != nil {
		if httpErr, ok := errors.AsType[api.HTTPError](err); ok && httpErr.StatusCode == http.StatusUnprocessableEntity {
			return "", commitNotFoundErr
		}
		return "", err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}

	return string(body), nil
}