Allow hsm to use relative paths

pkg/hsm/hsm.go

@@ -69,21 +69,18 @@ func NewAccess(infoLog *log.Logger, options ...ConfigOption) (*Access, error) {
 	return access, nil
 }
 
-func (c *caFile) buildCertificatePath(caDirectory string) (string, error) {
+func (c *caFile) buildCertificatePath(caDirectory string) string {
 	fileName := c.sc.CertificateFileName(c.label)
 
 	if caDirectory == "" {
-		return "", errors.New("CA directory is not set")
+		return fileName
 	}
 
-	return path.Join(caDirectory, fileName), nil
+	return path.Join(caDirectory, fileName)
 }
 
 func (c *caFile) loadCertificate(caDirectory string) (*x509.Certificate, error) {
-	certFile, err := c.buildCertificatePath(caDirectory)
-	if err != nil {
-		return nil, err
-	}
+	certFile := c.buildCertificatePath(caDirectory)
 
 	certFileInfo, err := os.Stat(certFile)
 	if err != nil {
@@ -121,12 +118,9 @@ func (c *caFile) loadCertificate(caDirectory string) (*x509.Certificate, error)
 }
 
 func (c *caFile) storeCertificate(caDirectory string, certificate []byte) error {
-	certFile, err := c.buildCertificatePath(caDirectory)
-	if err != nil {
-		return err
-	}
+	certFile := c.buildCertificatePath(caDirectory)
 
-	err = os.WriteFile(certFile, certificate, 0o600)
+	err := os.WriteFile(certFile, certificate, 0o600)
 	if err != nil {
 		return fmt.Errorf("could not write certificate file %s: %w", certFile, err)
 	}