Let brother's scan-folder take an absolute path: mesh-config matches a pattern against the whole value (issue 1472)

modules/brother/cmd/brother/manifest_test.go

@@ -357,3 +357,41 @@ func TestTheBucketIsRequiredAndItsKeyIsOnlyTheDeviceAccounts(t *testing.T) {
 		}
 	}
 }
+
+// Issue 1472: mesh-config matches a config value against its pattern whole, as mesh-sdk's catalogue compiles it
+// (`^(?:<pattern>)$`, go/catalogue/config.go). Each value the operator gives on a real node passes, and a value
+// of the wrong form does not.
+func TestEachConfigPatternAdmitsARealValueWhole(t *testing.T) {
+	raw, err := os.ReadFile(filepath.Join("..", "..", "module.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var m struct {
+		Config map[string]struct {
+			Pattern string `json:"pattern"`
+		} `json:"config"`
+	}
+	if err := json.Unmarshal(raw, &m); err != nil {
+		t.Fatal(err)
+	}
+	cases := map[string]struct{ good, bad string }{
+		"scanner":             {"http://192.0.2.10/eSCL", "192.0.2.10"},
+		"scan-folder":         {"/home/operator/Documents/Scans", "Documents/Scans"},
+		"printer":             {"192.0.2.10", "http://192.0.2.10"},
+		"printer-certificate": {"EA:B4:B7:0F:96:CD:A6:2B:61:53:2E:F0:A8:D6:9F:42:EA:9F:66:0A:82:5B:C2:43:0B:97:C5:9A:7A:B4:18:5B", "EAB4"},
+	}
+	for key, c := range cases {
+		p := m.Config[key].Pattern
+		if p == "" {
+			t.Errorf("%s declares no pattern", key)
+			continue
+		}
+		re := regexp.MustCompile(`^(?:` + p + `)$`)
+		if !re.MatchString(c.good) {
+			t.Errorf("%s's pattern %q refuses the real value %q", key, p, c.good)
+		}
+		if re.MatchString(c.bad) {
+			t.Errorf("%s's pattern %q admits %q", key, p, c.bad)
+		}
+	}
+}

modules/brother/module.json

@@ -21,7 +21,7 @@
     "scan-folder": {
       "type": "string",
       "description": "The absolute path of the folder the scans are filed in as PDF files; the module makes it when it files the first scan, and never touches a file in it that it did not write. The operator's, with no default.",
-      "pattern": "^/",
+      "pattern": "^/.+$",
       "trusted": true,
       "required": true
     },