Print version information when using --version flag

Signed-off-by: Caleb Xu <[email protected]>

Author: caxu-rh

Dockerfile

@@ -12,7 +12,7 @@ ARG OS
 # Build the preflight binary
 COPY . /go/src/preflight-trigger
 WORKDIR /go/src/preflight-trigger
-RUN make build
+RUN make build RELEASE_TAG=${release_tag}
 
 
 FROM registry.access.redhat.com/ubi9/ubi-micro:latest

Makefile

@@ -8,12 +8,13 @@ export CONTAINER_ENGINE ?= podman
 export BIN_NAME
 export REGISTRY ?= quay.io
 export REGISTRY_NAMESPACE ?= opdev
+VERSION=$(shell git rev-parse HEAD)
 export RELEASE_TAG ?= "0.0.0"
 
 
 .PHONY: binary-build
 binary-build:
-	$(CONTAINER_ENGINE) run --rm -v $(PWD):/usr/src/$(BIN_NAME) -w /usr/src/$(BIN_NAME) -e GOOS=linux -e GOARCH=amd64 docker.io/library/golang:alpine go build -o $(BIN_NAME)
+	$(CONTAINER_ENGINE) run --rm -v $(PWD):/usr/src/$(BIN_NAME) -w /usr/src/$(BIN_NAME) -e GOOS=linux -e GOARCH=amd64 docker.io/library/golang:alpine go build -ldflags "-X github.com/redhat-openshift-ecosystem/preflight-trigger/cmd.commit=$(VERSION) -X github.com/redhat-openshift-ecosystem/preflight-trigger/cmd.version=$(RELEASE_TAG)" -o $(BIN_NAME)
 
 .PHONY: image-build
 image-build:
@@ -25,7 +26,7 @@ image-push:
 
 .PHONY: build
 build:
-	CGO_ENABLED=0 go build -o $(BIN_NAME) main.go
+	CGO_ENABLED=0 go build -ldflags "-X github.com/redhat-openshift-ecosystem/preflight-trigger/cmd.commit=$(VERSION) -X github.com/redhat-openshift-ecosystem/preflight-trigger/cmd.version=$(RELEASE_TAG)" -o $(BIN_NAME) main.go
 	@ls | grep -e '^preflight-trigger$$' &> /dev/null
 
 .PHONY: vet

cmd/root.go

@@ -58,9 +58,10 @@ var CommandFlags FlagsData
 
 // rootCmd represents the base command when called without any subcommands
 var rootCmd = &cobra.Command{
-	Use:   "preflight-trigger",
-	Short: "Create on-demand preflight jobs in openshift-ci system",
-	Long:  ``,
+	Use:     "preflight-trigger",
+	Short:   "Create on-demand preflight jobs in openshift-ci system",
+	Long:    ``,
+	Version: Version.String(),
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.

cmd/version.go

@@ -0,0 +1,25 @@
+package cmd
+
+import "fmt"
+
+var (
+	projectName = "github.com/redhat-openshift-ecosystem/preflight-trigger"
+	version     = "unknown"
+	commit      = "unknown"
+)
+
+var Version = VersionContext{
+	Name:    projectName,
+	Version: version,
+	Commit:  commit,
+}
+
+type VersionContext struct {
+	Name    string `json:"name"`
+	Version string `json:"version"`
+	Commit  string `json:"commit"`
+}
+
+func (vc *VersionContext) String() string {
+	return fmt.Sprintf("%s <commit: %s>", vc.Version, vc.Commit)
+}