versioning: revert spec version to 0.2.0

invoke/get_version_integration_test.go

@@ -52,15 +52,33 @@ var _ = Describe("GetVersion, integration tests", func() {
 
 			Expect(versionInfo.SupportedVersions()).To(ConsistOf(expectedVersions.SupportedVersions()))
 		},
-		Entry("old plugin, before VERSION was introduced", git_ref_v010, plugin_source_v010, version.PluginSupports("0.1.0")),
-		Entry("when VERSION was introduced", git_ref_v020, plugin_source_v010, version.PluginSupports("0.1.0", "0.2.0")),
-		Entry("when plugins report their own version support", git_ref_v030, plugin_source_v030, version.PluginSupports("0.3.0", "0.999.0")),
-		Entry("HEAD", "HEAD", plugin_source_v030, version.PluginSupports("0.3.0", "0.999.0")),
+
+		Entry("historical: before VERSION was introduced",
+			git_ref_v010, plugin_source_no_custom_versions,
+			version.PluginSupports("0.1.0"),
+		),
+
+		Entry("historical: when VERSION was introduced but plugins couldn't customize it",
+			git_ref_v020_no_custom_versions, plugin_source_no_custom_versions,
+			version.PluginSupports("0.1.0", "0.2.0"),
+		),
+
+		Entry("historical: when plugins started reporting their own version list",
+			git_ref_v020_custom_versions, plugin_source_v020_custom_versions,
+			version.PluginSupports("0.2.0", "0.999.0"),
+		),
+
+		// this entry tracks the current behavior.  Before you change it, ensure
+		// that its previous behavior is captured in the most recent "historical" entry
+		Entry("current",
+			"HEAD", plugin_source_v020_custom_versions,
+			version.PluginSupports("0.2.0", "0.999.0"),
+		),
 	)
 })
 
-// a 0.3.0 plugin that can report its own versions
-const plugin_source_v030 = `package main
+// a 0.2.0 plugin that can report its own versions
+const plugin_source_v020_custom_versions = `package main
 
 import (
 	"github.com/containernetworking/cni/pkg/skel"
@@ -70,12 +88,12 @@ import (
 
 func c(_ *skel.CmdArgs) error { fmt.Println("{}"); return nil }
 
-func main() { skel.PluginMain(c, c, version.PluginSupports("0.3.0", "0.999.0")) }
+func main() { skel.PluginMain(c, c, version.PluginSupports("0.2.0", "0.999.0")) }
 `
-const git_ref_v030 = "bf31ed15"
+const git_ref_v020_custom_versions = "bf31ed15"
 
-// a minimal 0.1.0 / 0.2.0 plugin
-const plugin_source_v010 = `package main
+// a minimal 0.1.0 / 0.2.0 plugin that cannot report it's own version support
+const plugin_source_no_custom_versions = `package main
 
 import "github.com/containernetworking/cni/pkg/skel"
 import "fmt"
@@ -86,4 +104,4 @@ func main() { skel.PluginMain(c, c) }
 `
 
 const git_ref_v010 = "2c482f4"
-const git_ref_v020 = "349d66d"
+const git_ref_v020_no_custom_versions = "349d66d"

skel/skel_test.go

@@ -186,7 +186,7 @@ var _ = Describe("dispatching to the correct callback", func() {
 
 			Expect(err).NotTo(HaveOccurred())
 			Expect(stdout).To(MatchJSON(`{
-				"cniVersion": "0.3.0",
+				"cniVersion": "0.2.0",
 				"supportedVersions": ["9.8.7"]
 			}`))
 		})

version/plugin_test.go

@@ -21,17 +21,21 @@ import (
 )
 
 var _ = Describe("Decoding versions reported by a plugin", func() {
-	var decoder *version.PluginDecoder
+	var (
+		decoder       *version.PluginDecoder
+		versionStdout []byte
+	)
 
 	BeforeEach(func() {
 		decoder = &version.PluginDecoder{}
+		versionStdout = []byte(`{
+			"cniVersion": "some-library-version",
+			"supportedVersions": [ "some-version", "some-other-version" ]
+		}`)
 	})
 
 	It("returns a PluginInfo that represents the given json bytes", func() {
-		pluginInfo, err := decoder.Decode([]byte(`{
-			"cniVersion": "some-library-version",
-			"supportedVersions": [ "some-version", "some-other-version" ]
-		}`))
+		pluginInfo, err := decoder.Decode(versionStdout)
 		Expect(err).NotTo(HaveOccurred())
 		Expect(pluginInfo).NotTo(BeNil())
 		Expect(pluginInfo.SupportedVersions()).To(Equal([]string{
@@ -41,37 +45,40 @@ var _ = Describe("Decoding versions reported by a plugin", func() {
 	})
 
 	Context("when the bytes cannot be decoded as json", func() {
+		BeforeEach(func() {
+			versionStdout = []byte(`{{{`)
+		})
+
 		It("returns a meaningful error", func() {
-			_, err := decoder.Decode([]byte(`{{{`))
+			_, err := decoder.Decode(versionStdout)
 			Expect(err).To(MatchError("decoding version info: invalid character '{' looking for beginning of object key string"))
 		})
 	})
 
 	Context("when the json bytes are missing the required CNIVersion field", func() {
+		BeforeEach(func() {
+			versionStdout = []byte(`{ "supportedVersions": [ "foo" ] }`)
+		})
+
 		It("returns a meaningful error", func() {
-			_, err := decoder.Decode([]byte(`{ "supportedVersions": [ "foo" ] }`))
+			_, err := decoder.Decode(versionStdout)
 			Expect(err).To(MatchError("decoding version info: missing field cniVersion"))
 		})
 	})
 
 	Context("when there are no supported versions", func() {
-		Context("when the cniVersion is 0.2.0", func() {
-			It("infers the supported versions are 0.1.0 and 0.2.0", func() {
-				pluginInfo, err := decoder.Decode([]byte(`{ "cniVersion": "0.2.0" }`))
-				Expect(err).NotTo(HaveOccurred())
-				Expect(pluginInfo).NotTo(BeNil())
-				Expect(pluginInfo.SupportedVersions()).To(Equal([]string{
-					"0.1.0",
-					"0.2.0",
-				}))
-			})
+		BeforeEach(func() {
+			versionStdout = []byte(`{ "cniVersion": "0.2.0" }`)
 		})
 
-		Context("when the cniVersion is >= 0.3.0", func() {
-			It("returns a meaningful error", func() {
-				_, err := decoder.Decode([]byte(`{ "cniVersion": "0.3.0" }`))
-				Expect(err).To(MatchError("decoding version info: missing field supportedVersions"))
-			})
+		It("assumes that the supported versions are 0.1.0 and 0.2.0", func() {
+			pluginInfo, err := decoder.Decode(versionStdout)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(pluginInfo).NotTo(BeNil())
+			Expect(pluginInfo.SupportedVersions()).To(Equal([]string{
+				"0.1.0",
+				"0.2.0",
+			}))
 		})
 	})
 

version/version.go

@@ -16,7 +16,7 @@ package version
 
 // Current reports the version of the CNI spec implemented by this library
 func Current() string {
-	return "0.3.0"
+	return "0.2.0"
 }
 
 // Legacy PluginInfo describes a plugin that is backwards compatible with the
@@ -24,6 +24,6 @@ func Current() string {
 // library ought to work correctly with a plugin that reports support for
 // Legacy versions.
 //
-// Any future CNI spec versions which meet this definition will be added to
+// Any future CNI spec versions which meet this definition should be added to
 // this list.
-var Legacy = PluginSupports("0.1.0", "0.2.0", "0.3.0")
+var Legacy = PluginSupports("0.1.0", "0.2.0")