chore: Externalize version & build information (#104)

* chore: Externalize version information

* Use full Git commit information

* Introduce short and long version information

* Typos

* More typos

5 files changed, 65 insertions, 20 deletions

diff --git a/.github/actions/spelling/allow.txt b/.github/actions/spelling/allow.txt
index ebcbc27..dca2d8c 100644
--- a/.github/actions/spelling/allow.txt
+++ b/.github/actions/spelling/allow.txt
@@ -63,6 +63,7 @@ gh
 ghcr
 githash
 github
+GOARCH
 goimports
 golang
 golangci
@@ -98,6 +99,7 @@ kubefake
 kubernetes
 Kustomization
 kustomize
+ldflags
 LDFLAGS
 len
 linted
@@ -171,6 +173,7 @@ structcheck
 svg
 svi
 svl
+SZ
 taglist
 tagsortmode
 TEMPFILE
diff --git a/Makefile b/Makefile
index 9de3316..b7d12c3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,3 @@
-LDFLAGS=-extldflags "-static"
-
 IMAGE_NAMESPACE?=argoprojlabs
 IMAGE_NAME=argocd-image-updater
 IMAGE_TAG?=latest
@@ -9,6 +7,21 @@ else
 IMAGE_PREFIX=
 endif
 
+CURRENT_DIR=$(shell pwd)
+VERSION=$(shell cat ${CURRENT_DIR}/VERSION)
+GIT_COMMIT=$(shell git rev-parse HEAD)
+BUILD_DATE=$(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
+
+LDFLAGS=
+
+VERSION_PACKAGE=github.com/argoproj-labs/argocd-image-updater/pkg/version
+
+override LDFLAGS += -extldflags "-static"
+override LDFLAGS += \
+	-X ${VERSION_PACKAGE}.version=${VERSION} \
+	-X ${VERSION_PACKAGE}.gitCommit=${GIT_COMMIT} \
+	-X ${VERSION_PACKAGE}.buildDate=${BUILD_DATE}
+
 .PHONY: all
 all: prereq controller
 
@@ -43,7 +56,7 @@ prereq:
 
 .PHONY: controller
 controller: 
-	CGO_ENABLED=0 go build -o dist/argocd-image-updater cmd/main.go
+	CGO_ENABLED=0 go build -ldflags '${LDFLAGS}' -o dist/argocd-image-updater cmd/main.go
 
 .PHONY: image
 image: clean-image mod-vendor
diff --git a/cmd/main.go b/cmd/main.go
index f5958d9..e4bb9f7 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -170,15 +170,25 @@ func newRootCommand() error {
 
 // newVersionCommand implements "version" command
 func newVersionCommand() *cobra.Command {
+	var short bool
 	var versionCmd = &cobra.Command{
 		Use:   "version",
 		Short: "Display version information",
 		RunE: func(cmd *cobra.Command, args []string) error {
-			fmt.Printf("%s\n", version.Useragent())
+			if !short {
+				fmt.Printf("%s\n", version.Useragent())
+				fmt.Printf("  BuildDate: %s\n", version.BuildDate())
+				fmt.Printf("  GitCommit: %s\n", version.GitCommit())
+				fmt.Printf("  GoVersion: %s\n", version.GoVersion())
+				fmt.Printf("  GoCompiler: %s\n", version.GoCompiler())
+				fmt.Printf("  Platform: %s\n", version.GoPlatform())
+			} else {
+				fmt.Printf("%s\n", version.Version())
+			}
 			return nil
 		},
 	}
-
+	versionCmd.Flags().BoolVar(&short, "short", false, "show only the version number")
 	return versionCmd
 }
 
diff --git a/pkg/version/version.go b/pkg/version/version.go
index 140b016..d9c405a 100644
--- a/pkg/version/version.go
+++ b/pkg/version/version.go
@@ -1,21 +1,20 @@
 package version
 
-import "fmt"
-
-const (
-	majorVersion     = "0"
-	minorVersion     = "7"
-	patchVersion     = "0"
-	preReleaseString = "master"
+import (
+	"fmt"
+	"runtime"
+	"time"
 )
 
-const binaryName = "argocd-image-updater"
+var (
+	version    = "9.9.99"
+	buildDate  = time.Now().UTC().Format(time.RFC3339)
+	gitCommit  = "unknown"
+	binaryName = "argocd-image-updater"
+)
 
 func Version() string {
-	version := fmt.Sprintf("v%s.%s.%s", majorVersion, minorVersion, patchVersion)
-	if preReleaseString != "" {
-		version += fmt.Sprintf("-%s", preReleaseString)
-	}
+	version := fmt.Sprintf("v%s+%s", version, gitCommit[0:7])
 	return version
 }
 
@@ -24,5 +23,25 @@ func BinaryName() string {
 }
 
 func Useragent() string {
-	return fmt.Sprintf("%s %s", BinaryName(), Version())
+	return fmt.Sprintf("%s: %s", BinaryName(), Version())
+}
+
+func GitCommit() string {
+	return gitCommit
+}
+
+func BuildDate() string {
+	return buildDate
+}
+
+func GoVersion() string {
+	return runtime.Version()
+}
+
+func GoPlatform() string {
+	return runtime.GOOS + "/" + runtime.GOARCH
+}
+
+func GoCompiler() string {
+	return runtime.Compiler
 }
diff --git a/pkg/version/version_test.go b/pkg/version/version_test.go
index a68c88f..638daa4 100644
--- a/pkg/version/version_test.go
+++ b/pkg/version/version_test.go
@@ -12,9 +12,9 @@ func Test_BinaryName(t *testing.T) {
 }
 
 func Test_Version(t *testing.T) {
-	assert.Regexp(t, `^v[0-9]\.[0-9]\.[0-9](-[a-z]+)*$`, Version())
+	assert.Regexp(t, `^v[0-9]+\.[0-9]+\.[0-9]+(\-[a-z]+)*(\+[a-z0-9]+)*$`, Version())
 }
 
 func Test_Useragent(t *testing.T) {
-	assert.Regexp(t, `^[a-z\-]+\sv[0-9]\.[0-9]\.[0-9](-[a-z]+)*$`, Useragent())
+	assert.Regexp(t, `^[a-z\-]+:\sv[0-9]+\.[0-9]+\.[0-9]+(-[a-z]+)*(\+[a-z0-9]+)*$`, Useragent())
 }