From 19205a61eb4633fa393680fd327f3314bfbe5bc1 Mon Sep 17 00:00:00 2001
From: Rohan Kumar <rohaan@redhat.com>
Date: Wed, 20 Nov 2024 22:32:24 +0530
Subject: [PATCH] feat (dns) : Add `host.crc.testing` to /etc/hosts (#4410)

+ Add another method `GetFQDN()` to CrcBundleInfo struct in order to
  provide host domain
+ Use abovementioned method in `dns.addOpenShiftHosts` in order to add
  another dns entry for `host.crc.testing`

Signed-off-by: Rohan Kumar <rohaan@redhat.com>
---
 pkg/crc/machine/bundle/metadata.go      |  6 +++-
 pkg/crc/machine/bundle/metadata_test.go | 22 ++++++++++++++
 pkg/crc/services/dns/dns.go             | 12 ++++++--
 pkg/crc/services/dns/dns_test.go        | 38 +++++++++++++++++++++++++
 4 files changed, 75 insertions(+), 3 deletions(-)
 create mode 100644 pkg/crc/services/dns/dns_test.go

diff --git a/pkg/crc/machine/bundle/metadata.go b/pkg/crc/machine/bundle/metadata.go
index a10c68a8a8..e9e541def8 100644
--- a/pkg/crc/machine/bundle/metadata.go
+++ b/pkg/crc/machine/bundle/metadata.go
@@ -108,8 +108,12 @@ func (bundle *CrcBundleInfo) GetBundleName() string {
 	return bundle.Name
 }
 
+func (bundle *CrcBundleInfo) GetFQDN(shortName string) string {
+	return fmt.Sprintf("%s.%s.%s", shortName, bundle.ClusterInfo.ClusterName, bundle.ClusterInfo.BaseDomain)
+}
+
 func (bundle *CrcBundleInfo) GetAPIHostname() string {
-	return fmt.Sprintf("api.%s.%s", bundle.ClusterInfo.ClusterName, bundle.ClusterInfo.BaseDomain)
+	return bundle.GetFQDN("api")
 }
 
 func (bundle *CrcBundleInfo) GetAppHostname(appName string) string {
diff --git a/pkg/crc/machine/bundle/metadata_test.go b/pkg/crc/machine/bundle/metadata_test.go
index f2218103c6..eff5d772eb 100644
--- a/pkg/crc/machine/bundle/metadata_test.go
+++ b/pkg/crc/machine/bundle/metadata_test.go
@@ -289,3 +289,25 @@ func TestGetBundleInfoFromNameInvalid(t *testing.T) {
 	_, err = GetBundleInfoFromName("crc_nanoshift_libvirt_4.16.7_amd64_232.crcbundle")
 	assert.Error(t, err)
 }
+
+func TestGetFQDN(t *testing.T) {
+	tests := []struct {
+		name               string
+		shortName          string
+		expectedDomainName string
+	}{
+		{"api host name", "api", "api.crc.testing"},
+		{"vm host name", "host", "host.crc.testing"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Given
+			// When
+			hostName := parsedReference.GetFQDN(tt.shortName)
+
+			// Then
+			assert.Equal(t, tt.expectedDomainName, hostName)
+		})
+	}
+}
diff --git a/pkg/crc/services/dns/dns.go b/pkg/crc/services/dns/dns.go
index eb2dec8254..87fff40a83 100644
--- a/pkg/crc/services/dns/dns.go
+++ b/pkg/crc/services/dns/dns.go
@@ -205,10 +205,18 @@ func matchIP(ips []net.IP, expectedIP string) bool {
 }
 
 func addOpenShiftHosts(serviceConfig services.ServicePostStartConfig) error {
-	return adminhelper.UpdateHostsFile(serviceConfig.IP, serviceConfig.BundleMetadata.GetAPIHostname(),
+	hostnames := getApplicableHostnames(serviceConfig)
+	return adminhelper.UpdateHostsFile(serviceConfig.IP, hostnames...)
+}
+
+func getApplicableHostnames(serviceConfig services.ServicePostStartConfig) []string {
+	return []string{
+		serviceConfig.BundleMetadata.GetAPIHostname(),
+		serviceConfig.BundleMetadata.GetFQDN("host"),
 		serviceConfig.BundleMetadata.GetAppHostname("oauth-openshift"),
 		serviceConfig.BundleMetadata.GetAppHostname("console-openshift-console"),
 		serviceConfig.BundleMetadata.GetAppHostname("downloads-openshift-console"),
 		serviceConfig.BundleMetadata.GetAppHostname("canary-openshift-ingress-canary"),
-		serviceConfig.BundleMetadata.GetAppHostname("default-route-openshift-image-registry"))
+		serviceConfig.BundleMetadata.GetAppHostname("default-route-openshift-image-registry"),
+	}
 }
diff --git a/pkg/crc/services/dns/dns_test.go b/pkg/crc/services/dns/dns_test.go
new file mode 100644
index 0000000000..80d994772b
--- /dev/null
+++ b/pkg/crc/services/dns/dns_test.go
@@ -0,0 +1,38 @@
+package dns
+
+import (
+	"testing"
+
+	"github.com/Masterminds/semver/v3"
+	"github.com/crc-org/crc/v2/pkg/crc/machine/bundle"
+	"github.com/crc-org/crc/v2/pkg/crc/services"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetApplicableHostnames(t *testing.T) {
+	// Given
+	bundleMetadata := services.ServicePostStartConfig{
+		BundleMetadata: bundle.CrcBundleInfo{
+			ClusterInfo: bundle.ClusterInfo{
+				OpenShiftVersion:  semver.MustParse("4.6.1"),
+				ClusterName:       "crc",
+				BaseDomain:        "testing",
+				AppsDomain:        "apps.crc.testing",
+				SSHPrivateKeyFile: "id_ecdsa_crc",
+				KubeConfig:        "kubeconfig",
+			},
+		},
+	}
+	// When
+	hostnames := getApplicableHostnames(bundleMetadata)
+	// Then
+	assert.Equal(t, []string{
+		"api.crc.testing",
+		"host.crc.testing",
+		"oauth-openshift.apps.crc.testing",
+		"console-openshift-console.apps.crc.testing",
+		"downloads-openshift-console.apps.crc.testing",
+		"canary-openshift-ingress-canary.apps.crc.testing",
+		"default-route-openshift-image-registry.apps.crc.testing",
+	}, hostnames)
+}