Fix the version stamp set during build (#124)

The ldflags passed to the build expect to be the root package for the
repository, and should contain the pkg directory with the version
variables so that the build can set them.

The package passed was to the plugin entry point (./cmd/kubernetes)
which caused the version stamp to be empty.

Signed-off-by: Carolyn Van Slyck <[email protected]>

magefile.go

@@ -4,12 +4,13 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
-
 	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"time"
 
@@ -61,13 +62,15 @@ const (
 	// Docker registry for porter client container
 	porterRegistry   = "ghcr.io/getporter"
 	porterConfigFile = "./tests/integration/operator/testdata/operator_porter_config.yaml"
+
+	// The root package name of the plugin repository
+	pluginPkg = "get.porter.sh/plugin/kubernetes"
 )
 
 // Dirs to watch recursively for build target
 var (
 	srcDirs             = []string{"cmd/", "pkg/", "go.mod", "magefile.go"}
 	binDir              = "bin/plugins/kubernetes/"
-	pluginPkg           = fmt.Sprintf("./cmd/%s", pluginName)
 	supportedClientGOOS = []string{"linux", "darwin", "windows"}
 	// number of nodes for ginkgo parallel test execution (1=sequential)
 	ginkgoNodes = "1"
@@ -165,6 +168,25 @@ func XBuildAll() {
 	}
 
 	releases.PreparePluginForPublish(pluginName)
+	verifyVersionStamp()
+}
+
+// verifyVersionStamp checks that the version was set on the cross-compiled binaries
+func verifyVersionStamp() {
+	// When this test fails, pluginPkg is set incorrectly or not passed to the releases functions properly
+	pluginBinaryPath := filepath.Join(binDir, fmt.Sprintf("dev/kubernetes-%s-amd64", runtime.GOOS))
+	versionOutput, _ := must.OutputV(pluginBinaryPath, "version", "-o=json")
+
+	var raw map[string]interface{}
+	if err := json.Unmarshal([]byte(versionOutput), &raw); err != nil {
+		mgx.Must(fmt.Errorf("error parsing the version command output as json: %w", err))
+	}
+
+	meta := releases.LoadMetadata()
+	gotVersion := raw["version"].(string)
+	if gotVersion != meta.Version {
+		mgx.Must(fmt.Errorf("the version was not set correctly on the kubernetes plugin binary %s: expected %q got %q", pluginBinaryPath, meta.Version, gotVersion))
+	}
 }
 
 // Run local integration tests against the test cluster.