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

backend/internal/server/server_test.go

@@ -9,8 +9,10 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"errors"
+	"io"
 	"net/http"
 	"net/http/httptest"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -204,3 +206,36 @@ func TestMachinesShowWhoIsOnline(t *testing.T) {
 		time.Sleep(20 * time.Millisecond)
 	}
 }
+
+func TestInstallScriptModes(t *testing.T) {
+	url := newServer(t)
+	var code protocol.CodeResponse
+	call(t, http.MethodPost, url+"/api/codes", adminToken, nil, &code)
+	if code.RemoteCommand != "curl -fsSL "+url+"/i/"+code.Code+"/remote | sh" {
+		t.Fatalf("remote command = %q", code.RemoteCommand)
+	}
+	for path, mode := range map[string]string{"/i/" + code.Code: "login", "/i/" + code.Code + "/remote": "remote"} {
+		res, err := http.Get(url + path)
+		if err != nil {
+			t.Fatal(err)
+		}
+		script, _ := io.ReadAll(res.Body)
+		res.Body.Close()
+		if res.StatusCode != http.StatusOK || !strings.Contains(string(script), `mode="`+mode+`"`) || !strings.Contains(string(script), `code="`+code.Code+`"`) {
+			t.Fatalf("%s: %d\n%s", path, res.StatusCode, script)
+		}
+		check := exec.Command("sh", "-n")
+		check.Stdin = bytes.NewReader(script)
+		if out, err := check.CombinedOutput(); err != nil {
+			t.Fatalf("%s is not valid sh: %v %s", path, err, out)
+		}
+	}
+	res, err := http.Get(url + "/i/abcdef/remote")
+	if err != nil {
+		t.Fatal(err)
+	}
+	res.Body.Close()
+	if res.StatusCode != http.StatusNotFound {
+		t.Fatalf("unknown code: %d", res.StatusCode)
+	}
+}