Adding a hint when the APP CR installation fails due to ca cert error

pkg/app/app_fetch.go

@@ -8,11 +8,17 @@ import (
 	"fmt"
 	"path"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/vmware-tanzu/carvel-kapp-controller/pkg/exec"
 )
 
+const (
+	addCACertMissingHintMsg = "(hint: The CA Certificate from URL is unknown/invalid. Add valid CA certificate to the kapp-controller configuration to reconcile successfully)"
+	caCertMissingError      = "x509: certificate signed by unknown authority"
+)
+
 func (a *App) fetch(dstPath string) (string, exec.CmdRunResult) {
 	if len(a.app.Spec.Fetch) == 0 {
 		return "", exec.NewCmdRunResultWithErr(fmt.Errorf("Expected at least one fetch option"))
@@ -67,6 +73,9 @@ func (a *App) fetch(dstPath string) (string, exec.CmdRunResult) {
 			}
 		}
 		if result.Error != nil {
+			if strings.Contains(result.Stderr, caCertMissingError) {
+				result.Stderr = fmt.Sprintf("%s%s", result.Stderr, addCACertMissingHintMsg)
+			}
 			return "", result
 		}
 	}
@@ -76,6 +85,12 @@ func (a *App) fetch(dstPath string) (string, exec.CmdRunResult) {
 		dstPath = path.Join(dstPath, "0")
 	}
 
+	if result.Error != nil {
+		if strings.Contains(result.Stderr, caCertMissingError) {
+			result.Stderr = fmt.Sprintf("%s%s", result.Stderr, addCACertMissingHintMsg)
+		}
+	}
+
 	return dstPath, result
 }
 

test/e2e/kappcontroller/config_test.go

@@ -422,3 +422,88 @@ stringData:
 		assert.Equal(t, actualSyncPeriod, expectedSyncPeriod)
 	})
 }
+
+func TestConfig_NoCACerts(t *testing.T) {
+	env := e2e.BuildEnv(t)
+	logger := e2e.Logger{}
+	kapp := e2e.Kapp{t, env.Namespace, logger}
+	sas := e2e.ServiceAccounts{env.Namespace}
+
+	name := "test-https"
+	pkgrName := "test-https-pkgr"
+	httpsServerName := "test-https-server"
+	configName := "test-config-missing-ca-config"
+
+	yaml1 := fmt.Sprintf(`---
+apiVersion: kappctrl.k14s.io/v1alpha1
+kind: App
+metadata:
+  name: test-https
+  annotations:
+    kapp.k14s.io/change-group: kappctrl-e2e.k14s.io/apps
+spec:
+  serviceAccountName: kappctrl-e2e-ns-sa
+  fetch:
+  - http:
+      # use https to exercise CA certificate validation
+      # When updating address, certs and keys must be regenerated
+      # for server and added to e2e/assets/https-server
+      url: https://https-svc.https-server.svc.cluster.local:443/deployment.yml
+  template:
+  - ytt: {}
+  deploy:
+  - kapp:
+      inspect: {}
+      intoNs: %s
+`, env.Namespace) + sas.ForNamespaceYAML()
+
+	cleanUp := func() {
+		kapp.Run([]string{"delete", "-a", name})
+		kapp.Run([]string{"delete", "-a", pkgrName})
+		kapp.Run([]string{"delete", "-a", configName})
+		kapp.Run([]string{"delete", "-a", httpsServerName})
+	}
+	cleanUp()
+	defer cleanUp()
+
+	logger.Section("deploy controller config with no CA cert", func() {
+		config := `
+apiVersion: v1
+kind: Secret
+metadata:
+  name: kapp-controller-config
+  namespace: kapp-controller
+stringData:
+  # CA Cert is not present
+  caCerts:
+`
+		kapp.RunWithOpts([]string{"deploy", "-f", "-", "-a", configName},
+			e2e.RunOpts{StdinReader: strings.NewReader(config)})
+
+		// Since config propagation is async, just wait a little bit
+		time.Sleep(2 * time.Second)
+	})
+
+	logger.Section("deploy https server with self signed certs", func() {
+		kapp.Run([]string{"deploy", "-f", "../assets/https-server/", "-a", httpsServerName})
+	})
+
+	logger.Section("deploy app that tries to fetch content from https server (whose certs are not uploaded to kapp-controller)", func() {
+		_, err := kapp.RunWithOpts([]string{"deploy", "-f", "-", "-a", name}, e2e.RunOpts{
+			StdinReader:  strings.NewReader(yaml1),
+			AllowError:   true,
+			OnErrKubectl: []string{"get", "app/test-https", "-oyaml"},
+		})
+		assert.Error(t, err, "Expected fetching error")
+
+		var cr v1alpha1.App
+
+		out := kapp.Run([]string{"inspect", "-a", name, "--raw", "--tty=false", "--filter-kind=App"})
+		assert.NoError(t, yaml.Unmarshal([]byte(out), &cr))
+
+		assert.NotNil(t, cr.Status.Fetch)
+		assert.Equal(t, cr.Status.Fetch.ExitCode, 1)
+		assert.Contains(t, cr.Status.Fetch.Stderr, "x509: certificate signed by unknown authority")
+		assert.Contains(t, cr.Status.Fetch.Stderr, "(hint: The CA Certificate from URL is unknown/invalid. Add valid CA certificate to the kapp-controller configuration to reconcile successfully)")
+	})
+}