Start api directory, which will become a module.

api/provenance/provenance.go

@@ -0,0 +1,54 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package provenance
+
+import (
+	"fmt"
+	"io"
+	"runtime"
+)
+
+var (
+	version = "unknown"
+	// sha1 from git, output of $(git rev-parse HEAD)
+	gitCommit = "$Format:%H$"
+	// build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
+	buildDate = "1970-01-01T00:00:00Z"
+	goos      = runtime.GOOS
+	goarch    = runtime.GOARCH
+)
+
+// Provenance holds information about the build of an executable.
+type Provenance struct {
+	// Version of the kustomize binary.
+	Version string `json:"version"`
+	// GitCommit is a git commit
+	GitCommit string `json:"gitCommit"`
+	// BuildDate is date of the build.
+	BuildDate string `json:"buildDate"`
+	// GoOs holds OS name.
+	GoOs string `json:"goOs"`
+	// GoArch holds architecture name.
+	GoArch string `json:"goArch"`
+}
+
+// GetProvenance returns an instance of Provenance.
+func GetProvenance() Provenance {
+	return Provenance{
+		version,
+		gitCommit,
+		buildDate,
+		goos,
+		goarch,
+	}
+}
+
+// Print prints provenance info.
+func (v Provenance) Print(w io.Writer, short bool) {
+	if short {
+		fmt.Fprintf(w, "%s\n", v.Version)
+	} else {
+		fmt.Fprintf(w, "Version: %+v\n", v)
+	}
+}