implemented pledge and unveil on openbsd

pkg/provider/parse/parse.go

@@ -38,6 +38,31 @@ func TryParse(url string) error {
 	return nil
 }
 
+func Paths(url string) (paths []string) {
+	u, err := neturl.Parse(url)
+	if err != nil {
+		return
+	}
+	switch u.Scheme {
+	case "file":
+		paths = append(paths, u.Path)
+	case "sftp":
+		q, err := neturl.ParseQuery(u.RawQuery)
+		if err != nil {
+			return
+		}
+		known, err := sftp.KnownHosts(q)
+		if err != nil {
+			return
+		}
+		paths = append(paths, known)
+		if key := q.Get(sftp.KeyParam); key != "" {
+			paths = append(paths, key)
+		}
+	}
+	return
+}
+
 func FS(url string, key []byte, re *regexp.Regexp, block bool) (provider.FS, error) {
 	u, err := neturl.Parse(url)
 	if err != nil {