Function fetchCommitSHA

pkg/cmd/extension/http.go:175–207

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) {
	url, err := safeurl.JoinPathWithHostPrefix(ghinstance.RESTPrefix(baseRepo.RepoHost()), "repos", baseRepo.RepoOwner(), baseRepo.RepoName(), "commits", targetRef)
	if err != nil {
		return "", err
	}
	req, err := http.NewRequest("GET", url.String(), nil)
	if err != nil {
		return "", err
	}

	req.Header.Set("Accept", "application/vnd.github.v3.sha")
	// TODO(api-client-rollout)
	// This has been deferred from moving to api.Client due to its custom Accept header and bare SHA response body.
	resp, err := httpClient.Do(req)
	if err != nil {
		return "", err
	}

	defer resp.Body.Close()
	if resp.StatusCode == 422 {
		return "", commitNotFoundErr
	}
	if resp.StatusCode > 299 {
		return "", api.HandleHTTPError(resp)
	}

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

	return string(body), nil
}