Fix panic in 'calicoctl get nodes'

Fix panic when bgpConfig.Spec.ASNumber was nil in calicoctl/calicoctl/commands/common/printer.go (used by calicoctl/calicoctl/resourcemgr/node.go when running 'calicoctl get nodes', #7755 for more info).

Add printer config() test to calicoctl/calicoctl/commands/common/printer_test.go.

Run ginkgo bootstrap in calicoctl/calicoctl/commands/common/ (tests were not being run previously).

Consider $(GINKGO_ARGS) when running the 'ut' target in calicoctl/Makefile.

calicoctl/Makefile

@@ -126,7 +126,7 @@ $(CALICO_VERSION_HELPER_BIN): $(CALICO_VERSION_HELPER_SRC)
 .PHONY: ut
 ## Run the tests in a container. Useful for CI, Mac dev.
 ut: bin/calicoctl-linux-amd64
-	$(DOCKER_RUN) $(CALICO_BUILD) sh -c 'cd /go/src/$(PACKAGE_NAME) && ginkgo -cover -r calicoctl/*'
+	$(DOCKER_RUN) $(CALICO_BUILD) sh -c 'cd /go/src/$(PACKAGE_NAME) && ginkgo -cover -r $(GINKGO_ARGS) calicoctl/*'
 
 ###############################################################################
 # FVs

calicoctl/calicoctl/commands/common/common_suite_test.go

@@ -0,0 +1,13 @@
+package common_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestCommon(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Common Suite")
+}

calicoctl/calicoctl/commands/common/printer.go

@@ -256,7 +256,13 @@ func config(client client.Interface) func(string) string {
 						asValue = "64512"
 					}
 				} else {
-					asValue = bgpConfig.Spec.ASNumber.String()
+					if bgpConfig.Spec.ASNumber != nil {
+						asValue = bgpConfig.Spec.ASNumber.String()
+					} else {
+						// Use the default ASNumber of 64512 when there is none configured (first ASN reserved for private use).
+						// https://en.m.wikipedia.org/wiki/Autonomous_system_(Internet)#ASN_Table
+						asValue = "64512"
+					}
 				}
 			}
 			return asValue

calicoctl/calicoctl/commands/common/printer_test.go

@@ -1,8 +1,20 @@
 package common
 
 import (
+	"context"
+	"errors"
+
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/ginkgo/extensions/table"
 	. "github.com/onsi/gomega"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	apiv3 "github.com/projectcalico/api/pkg/apis/projectcalico/v3"
+	"github.com/projectcalico/api/pkg/lib/numorstring"
+	"github.com/projectcalico/calico/libcalico-go/lib/clientv3"
+	cerrors "github.com/projectcalico/calico/libcalico-go/lib/errors"
+	"github.com/projectcalico/calico/libcalico-go/lib/options"
 )
 
 var nilSlice []int
@@ -37,3 +49,83 @@ var _ = DescribeTable("Testing joinAndTruncate",
 	Entry("slice no truncate", []int{123456}, ",", 6, "123456"),
 	Entry("string", "HelloWorld", ",", 0, "HelloWorld"),
 )
+
+var _ = Describe("Testing printer config()", func() {
+	var client *mockClient
+	BeforeEach(func() {
+		client = newMockClient()
+	})
+
+	It("prints the default asnumber 64512 when BGPConfig.Spec.ASNumber is nil", func() {
+		Expect(config(client)("asnumber")).To(Equal("64512"))
+	})
+
+	It("prints the default asnumber 64512 when the default BGPConfig cannot be found", func() {
+		client.bgpConfig = nil
+		Expect(config(client)("asnumber")).To(Equal("64512"))
+	})
+
+	It("prints the asnumber from BGPConfig.Spec.ASNumber when it is present", func() {
+		asNumber := numorstring.ASNumber(12345)
+		bgpConfig := apiv3.BGPConfiguration{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "default", ResourceVersion: "1234",
+				CreationTimestamp: metav1.Now(),
+				UID:               "test-printer-bgpconfig",
+			},
+			Spec: apiv3.BGPConfigurationSpec{
+				ASNumber: &asNumber,
+			},
+		}
+		client.BGPConfigurations().Update(context.Background(), &bgpConfig, options.SetOptions{})
+		Expect(config(client)("asnumber")).To(Equal(asNumber.String()))
+	})
+
+	It("prints 'unknown' when there is an error getting the default BGPConfig", func() {
+		client.throwError = true
+		Expect(config(client)("asnumber")).To(Equal("unknown"))
+	})
+})
+
+type mockClient struct {
+	clientv3.Interface
+	clientv3.BGPConfigurationInterface
+	bgpConfig  *apiv3.BGPConfiguration
+	throwError bool
+}
+
+func newMockClient() *mockClient {
+	return &mockClient{
+		bgpConfig: &apiv3.BGPConfiguration{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "default", ResourceVersion: "1234",
+				CreationTimestamp: metav1.Now(),
+				UID:               "test-printer-bgpconfig",
+			},
+			Spec: apiv3.BGPConfigurationSpec{},
+		},
+		throwError: false,
+	}
+}
+
+func (c *mockClient) BGPConfigurations() clientv3.BGPConfigurationInterface {
+	return c
+}
+
+func (c *mockClient) Get(_ context.Context, name string, _ options.GetOptions) (*apiv3.BGPConfiguration, error) {
+	if c.throwError {
+		return nil, errors.New("mock error for testing")
+	}
+
+	if c.bgpConfig == nil {
+		return nil, cerrors.ErrorResourceDoesNotExist{}
+
+	}
+
+	return c.bgpConfig, nil
+}
+
+func (c *mockClient) Update(_ context.Context, res *apiv3.BGPConfiguration, _ options.SetOptions) (*apiv3.BGPConfiguration, error) {
+	c.bgpConfig = res
+	return c.bgpConfig, nil
+}