Always get commit from build info, always get date from ldflag, use l…

…dflag for version only on release

Makefile

@@ -75,8 +75,7 @@ $(MYGOBIN)/pluginator:
 # Build from local source.
 $(MYGOBIN)/kustomize: build-kustomize-api
 	cd kustomize; \
-	go install -ldflags "-X sigs.k8s.io/kustomize/api/provenance.buildDate=$(shell date -u +"%Y-%m-%dT%H:%M:%SZ") \
-	-X sigs.k8s.io/kustomize/api/provenance.version=(devel)" \
+	go install -ldflags "-X sigs.k8s.io/kustomize/api/provenance.buildDate=$(shell date -u +'%Y-%m-%dT%H:%M:%SZ')" \
 	.
 
 kustomize: $(MYGOBIN)/kustomize

api/Makefile

@@ -7,7 +7,7 @@ test:
 	go test -v -timeout 45m -cover ./... -ldflags "-X sigs.k8s.io/kustomize/api/provenance.version=(test)"
 
 build:
-	go build ./...
+	go build -ldflags "-X sigs.k8s.io/kustomize/api/provenance.buildDate=$(shell date -u +"%Y-%m-%dT%H:%M:%SZ")" ./...
 
 generate: $(MYGOBIN)/k8scopy $(MYGOBIN)/stringer
 	go generate ./...

api/provenance/provenance.go

@@ -10,15 +10,20 @@ import (
 	"strings"
 )
 
+// These variables are set at build time using ldflags.
+//
 //nolint:gochecknoglobals
 var (
-	version = "unknown"
-	// sha1 from git, output of $(git rev-parse HEAD)
-	gitCommit = "unknown"
+	// During a release, this will be set to the release tag, e.g. "kustomize/v4.5.7"
+	version = developmentVersion
 	// build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
 	buildDate = "unknown"
 )
 
+// This default value, (devel), matches
+// the value debug.BuildInfo uses for an unset main module version.
+const developmentVersion = "(devel)"
+
 // Provenance holds information about the build of an executable.
 type Provenance struct {
 	// Version of the kustomize binary.
@@ -40,7 +45,7 @@ func GetProvenance() Provenance {
 	p := Provenance{
 		BuildDate: buildDate,
 		Version:   version,
-		GitCommit: gitCommit,
+		GitCommit: "unknown",
 		GoOs:      runtime.GOOS,
 		GoArch:    runtime.GOARCH,
 		GoVersion: runtime.Version(),
@@ -50,15 +55,12 @@ func GetProvenance() Provenance {
 		return p
 	}
 
-	// override with values from BuildInfo
 	for _, setting := range info.Settings {
+		// For now, the git commit is the only information of interest.
+		// We could consider adding other info such as the commit date in the future.
 		switch setting.Key {
 		case "vcs.revision":
-			if p.Version == "(devel)" {
-				p.GitCommit = setting.Value
-			}
-		case "GOOS":
-			p.GoOs = setting.Value
+			p.GitCommit = setting.Value
 		}
 	}
 	return p

kustomize.Dockerfile

@@ -12,7 +12,6 @@ ADD . /build/
 WORKDIR /build/kustomize
 RUN CGO_ENABLED=0 GO111MODULE=on go build \
     -ldflags="-s -X sigs.k8s.io/kustomize/api/provenance.version=${VERSION} \
-    -X sigs.k8s.io/kustomize/api/provenance.gitCommit=${COMMIT} \
     -X sigs.k8s.io/kustomize/api/provenance.buildDate=${DATE}"
 
 # only copy binary

kustomize/commands/version/version.go

@@ -67,6 +67,7 @@ func (o *Options) Run() error {
 		if o.Short {
 			fmt.Fprintln(o.Writer, provenance.GetProvenance().Short())
 		} else {
+			fmt.Fprintln(os.Stderr, "WARNING: This version information is deprecated and will be replaced with the output from kustomize version --short.  Use --output=yaml|json to get the full version.")
 			fmt.Fprintln(o.Writer, provenance.GetProvenance().Full())
 		}
 	case "yaml":

releasing/run-goreleaser.sh

@@ -101,7 +101,6 @@ builds:
   ldflags: >
     -s
     -X sigs.k8s.io/kustomize/api/provenance.version={{.Version}}
-    -X sigs.k8s.io/kustomize/api/provenance.gitCommit={{.Commit}}
     -X sigs.k8s.io/kustomize/api/provenance.buildDate={{.Date}}
 
   goos: