List supported k8s versions in eksctl version (#2126)

List Supported K8s Versions in `eksctl version`

This change was made to list the EKS Server Supported Versions. Added the functionality for eksctl version command to show the EKS server supported versions in a new line.

Issue #2040

cmd/eksctl/version.go

@@ -20,7 +20,7 @@ func versionCmd(_ *cmdutils.FlagGrouping) *cobra.Command {
 			case "":
 				fmt.Printf("%s\n", version.GetVersion())
 			case "json":
-				fmt.Printf("%#v\n", version.GetVersionInfo())
+				fmt.Printf("%s\n", version.String())
 			default:
 				return fmt.Errorf("unknown output: %s", output)
 			}

pkg/version/version.go

@@ -4,15 +4,18 @@ import (
 	"encoding/json"
 	"fmt"
 	"strings"
+
+	"github.com/weaveworks/eksctl/pkg/apis/eksctl.io/v1alpha5"
 )
 
 //go:generate go run ./release_generate.go
 
 // Info holds version information
 type Info struct {
-	Version      string
-	PreReleaseID string
-	Metadata     BuildMetadata
+	Version                    string
+	PreReleaseID               string
+	Metadata                   BuildMetadata
+	EKSServerSupportedVersions []string
 }
 
 // BuildMetadata contains the semver build metadata:
@@ -31,6 +34,7 @@ func GetVersionInfo() Info {
 			GitCommit: gitCommit,
 			BuildDate: buildDate,
 		},
+		EKSServerSupportedVersions: v1alpha5.SupportedVersions(),
 	}
 }
 

pkg/version/version_test.go

@@ -3,6 +3,7 @@ package version
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/weaveworks/eksctl/pkg/apis/eksctl.io/v1alpha5"
 )
 
 var _ = Describe("release tests", func() {
@@ -19,9 +20,10 @@ var _ = Describe("release tests", func() {
 
 		Expect(v).To(Equal("0.5.0"))
 		Expect(info).To(Equal(Info{
-			Version:      "0.5.0",
-			PreReleaseID: "",
-			Metadata:     BuildMetadata{},
+			Version:                    "0.5.0",
+			PreReleaseID:               "",
+			Metadata:                   BuildMetadata{},
+			EKSServerSupportedVersions: v1alpha5.SupportedVersions(),
 		}))
 	})
 
@@ -42,6 +44,7 @@ var _ = Describe("release tests", func() {
 				GitCommit: "abc123",
 				BuildDate: "today",
 			},
+			EKSServerSupportedVersions: v1alpha5.SupportedVersions(),
 		}))
 	})
 
@@ -61,6 +64,7 @@ var _ = Describe("release tests", func() {
 				GitCommit: "abc123",
 				BuildDate: "today",
 			},
+			EKSServerSupportedVersions: v1alpha5.SupportedVersions(),
 		}))
 	})
 
@@ -80,6 +84,7 @@ var _ = Describe("release tests", func() {
 				GitCommit: "abc1234",
 				BuildDate: "2020-01-15T14:03:46Z",
 			},
+			EKSServerSupportedVersions: v1alpha5.SupportedVersions(),
 		}))
 	})
 
@@ -91,9 +96,10 @@ var _ = Describe("release tests", func() {
 
 		Expect(v).To(Equal("0.5.0-dev"))
 		Expect(info).To(Equal(Info{
-			Version:      "0.5.0",
-			PreReleaseID: "dev",
-			Metadata:     BuildMetadata{},
+			Version:                    "0.5.0",
+			PreReleaseID:               "dev",
+			Metadata:                   BuildMetadata{},
+			EKSServerSupportedVersions: v1alpha5.SupportedVersions(),
 		}))
 	})