feat(server,client): remote install mode, install survives missing systemd

backend/internal/server/server.go

@@ -59,7 +59,8 @@ type machineKey struct{}
 func New(store *Store, config Config) http.Handler {
 	s := &Server{config: config, store: store, subscribers: map[chan protocol.Event]struct{}{}, streams: map[int64]int{}, seen: map[int64]int64{}}
 	mux := http.NewServeMux()
-	mux.HandleFunc("GET /i/{code}", s.install)
+	mux.HandleFunc("GET /i/{code}", s.install("login"))
+	mux.HandleFunc("GET /i/{code}/remote", s.install("remote"))
 	mux.Handle("GET /dl/", http.StripPrefix("/dl/", http.FileServer(http.Dir(config.ClientsDir))))
 	mux.HandleFunc("POST /api/claim", s.claim)
 	mux.HandleFunc("POST /api/session", s.login)
@@ -159,14 +160,16 @@ func (s *Server) publicURL(r *http.Request) string {
 	return scheme + "://" + r.Host
 }
 
-func (s *Server) install(w http.ResponseWriter, r *http.Request) {
-	code := r.PathValue("code")
-	if !codePattern.MatchString(code) || !s.store.CodeValid(r.Context(), code) {
-		http.Error(w, "echo 'lodge: this install link has expired, create a new one' >&2; exit 1", http.StatusNotFound)
-		return
+func (s *Server) install(mode string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		code := r.PathValue("code")
+		if !codePattern.MatchString(code) || !s.store.CodeValid(r.Context(), code) {
+			http.Error(w, "echo 'lodge: this install link has expired, create a new one' >&2; exit 1", http.StatusNotFound)
+			return
+		}
+		w.Header().Set("Content-Type", "text/x-shellscript")
+		_, _ = strings.NewReplacer("{{URL}}", s.publicURL(r), "{{CODE}}", code, "{{MODE}}", mode).WriteString(w, installScript)
 	}
-	w.Header().Set("Content-Type", "text/x-shellscript")
-	_, _ = strings.NewReplacer("{{URL}}", s.publicURL(r), "{{CODE}}", code).WriteString(w, installScript)
 }
 
 func (s *Server) setSession(w http.ResponseWriter, r *http.Request, token string, expires time.Time) {
@@ -264,9 +267,10 @@ func (s *Server) createCode(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	writeJSON(w, http.StatusCreated, protocol.CodeResponse{
-		Code:      code,
-		Command:   fmt.Sprintf("curl -fsSL %s/i/%s | sh", s.publicURL(r), code),
-		ExpiresAt: expires.UnixMilli(),
+		Code:          code,
+		Command:       fmt.Sprintf("curl -fsSL %s/i/%s | sh", s.publicURL(r), code),
+		RemoteCommand: fmt.Sprintf("curl -fsSL %s/i/%s/remote | sh", s.publicURL(r), code),
+		ExpiresAt:     expires.UnixMilli(),
 	})
 }