Add commit ID to version output

- use ldflags to injects the git commit ID at build time
- add the commit ID to the version output
- add the possibility to get the version and commit information in a
  JSON format

close redhat-certification#362

Signed-off-by: mgoerens <[email protected]>

Makefile

@@ -3,6 +3,7 @@
 IMAGE_BUILDER?=podman
 IMAGE_REPO?=quay.io/redhat-certification
 COMMIT_ID=$(shell git rev-parse --short HEAD)
+COMMIT_ID_LONG=$(shell git rev-parse HEAD)
 
 default: bin
 
@@ -33,15 +34,19 @@ fmt: install.gofumpt
 
 .PHONY: bin
 bin:
-	CGO_ENABLED=0 go build -o ./out/chart-verifier main.go
+	CGO_ENABLED=0 go build \
+		-ldflags "-X 'github.com/redhat-certification/chart-verifier/cmd.CommitIDLong=$(COMMIT_ID_LONG)'" \
+		-o ./out/chart-verifier main.go
 
 .PHONY: lint
 lint: install.golangci-lint
 	$(GOLANGCI_LINT) run
 
 .PHONY: bin_win
 bin_win:
-	env GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -o .\out\chart-verifier.exe main.go
+	env GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build \
+		-ldflags "-X 'github.com/redhat-certification/chart-verifier/cmd.CommitIDLong=$(COMMIT_ID_LONG)'" \
+		-o .\out\chart-verifier.exe main.go
 
 .PHONY: test
 test:

cmd/version.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	_ "embed"
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
@@ -11,10 +12,27 @@ import (
 	apiversion "github.com/redhat-certification/chart-verifier/pkg/chartverifier/version"
 )
 
+// Print version and commit ID as json blob
+var asData bool
+
 func init() {
 	rootCmd.AddCommand(NewVersionCmd())
 }
 
+// CommitIDLong contains the commit ID the binary was build on. It is populated at build time by ldflags.
+// If you're running from a local debugger it will show an empty commit ID.
+var CommitIDLong string = "unknown"
+
+type VersionContext struct {
+	Version string `json:"version"`
+	Commit  string `json:"commit"`
+}
+
+var Version = VersionContext{
+	Version: apiversion.GetVersion(),
+	Commit:  CommitIDLong,
+}
+
 func NewVersionCmd() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "version",
@@ -24,10 +42,20 @@ func NewVersionCmd() *cobra.Command {
 			return runVersion(os.Stdout)
 		},
 	}
+	cmd.Flags().BoolVar(&asData, "as-data", false, "output the version and commit ID information in JSON format")
 	return cmd
 }
 
 func runVersion(out io.Writer) error {
-	fmt.Fprintf(out, "v%s\n", apiversion.GetVersion())
+	if asData {
+		marshalledVersion, err := json.Marshal(Version)
+		if err != nil {
+			return err
+		}
+		fmt.Fprint(out, string(marshalledVersion))
+		return nil
+	}
+
+	fmt.Fprintf(out, "chart-verifier v%s <commit: %s>\n", apiversion.GetVersion(), CommitIDLong)
 	return nil
 }