Add Verification of OneAgent Version

pkg/api/v1beta2/dynakube/validation/oneagent.go

@@ -3,9 +3,11 @@ package validation
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	"github.com/Dynatrace/dynatrace-operator/pkg/api/v1beta2/dynakube"
 	"github.com/Dynatrace/dynatrace-operator/pkg/util/kubeobjects/env"
+	"golang.org/x/mod/semver"
 	"k8s.io/apimachinery/pkg/labels"
 )
 
@@ -139,3 +141,17 @@ func conflictingHostGroupSettings(_ context.Context, _ *Validator, dk *dynakube.
 
 	return ""
 }
+
+func validateOneAgentVersionIsSemVerCompliant(_ context.Context, _ *Validator, dk *dynakube.DynaKube) string {
+	agentVersion := dk.CustomOneAgentVersion()
+	if agentVersion == "" {
+		return ""
+	}
+
+	version := "v" + agentVersion
+	if !(semver.IsValid(version) && semver.Prerelease(version) == "" && semver.Build(version) == "" && len(strings.Split(version, ".")) == 3) {
+		return "Only semantic versions in the form of major.minor.patch (e.g. 1.0.0) are allowed!"
+	}
+
+	return ""
+}

pkg/api/v1beta2/dynakube/validation/oneagent_test.go

@@ -424,3 +424,41 @@ func createDynakubeWithHostGroup(args []string, hostGroup string) *dynakube.Dyna
 		},
 	}
 }
+
+func TestValidateOneAgentVersionIsSemVer(t *testing.T) {
+	testCasesAcceptedVersions := []string{"", "1.0.0", "1.200.1"}
+
+	testCasesNotAcceptedVersions := []string{"latest", "raw", "1.200.1-raw", "v1.200.1-raw", "1.200.1+build", "v1.200.1+build", "1.200.1-raw+build", "v1.200.1-raw+build", "1.200", "v1.200", "1", "v1", "1.0", "v1.0", "v1.200.0"}
+
+	for _, tc := range testCasesAcceptedVersions {
+		t.Run("should accept version "+tc, func(t *testing.T) {
+			assertAllowed(t, &dynakube.DynaKube{
+				ObjectMeta: defaultDynakubeObjectMeta,
+				Spec: dynakube.DynaKubeSpec{
+					APIURL: testApiUrl,
+					OneAgent: dynakube.OneAgentSpec{
+						ClassicFullStack: &dynakube.HostInjectSpec{
+							Version: tc,
+						},
+					},
+				},
+			})
+		})
+	}
+
+	for _, tc := range testCasesNotAcceptedVersions {
+		t.Run("should accept version "+tc, func(t *testing.T) {
+			assertDenied(t, []string{"Only semantic versions in the form of major.minor.patch (e.g. 1.0.0) are allowed!"}, &dynakube.DynaKube{
+				ObjectMeta: defaultDynakubeObjectMeta,
+				Spec: dynakube.DynaKubeSpec{
+					APIURL: testApiUrl,
+					OneAgent: dynakube.OneAgentSpec{
+						ClassicFullStack: &dynakube.HostInjectSpec{
+							Version: tc,
+						},
+					},
+				},
+			})
+		})
+	}
+}

pkg/api/v1beta2/dynakube/validation/validation.go

@@ -37,6 +37,7 @@ var (
 		nameTooLong,
 		namespaceSelectorViolateLabelSpec,
 		imageFieldHasTenantImage,
+		validateOneAgentVersionIsSemVerCompliant,
 	}
 	validatorWarningFuncs = []validatorFunc{
 		missingActiveGateMemoryLimit,