update goreleaser builds

.goreleaser.yml

@@ -18,11 +18,10 @@ project_name: s3www
 
 before:
   hooks:
-    - go mod tidy -compat=1.17
+    - go mod tidy -compat=1.21
+
 builds:
   -
-    flags:
-      - -trimpath
     goos:
       - darwin
       - linux
@@ -34,6 +33,11 @@ builds:
       - s390x
     env:
       - CGO_ENABLED=0
+    flags:
+      - -trimpath
+    ldflags:
+      - "-s -w -X main.version={{.Version}}"
+
 archives:
   -
     format_overrides:

Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.17
+FROM golang:1.21
 
 RUN \
     mkdir -p /licenses && \

main.go

@@ -17,6 +17,7 @@ package main
 import (
 	"context"
 	"flag"
+	"fmt"
 	"log"
 	"net"
 	"net/http"
@@ -35,6 +36,10 @@ import (
 	"github.com/rs/cors"
 )
 
+// Use e.g.: go build -ldflags "-X main.version=v1.0.0"
+// to set the binary version.
+var version = "0.0.0-dev"
+
 // S3 - A S3 implements FileSystem using the minio client
 // allowing access to your S3 buckets and objects.
 //
@@ -134,9 +139,11 @@ var (
 	spaFile           string
 	allowedCorsOrigin string
 	letsEncrypt       bool
+	versionF          = flag.Bool("version", false, "print version")
 )
 
 func init() {
+	flag.BoolVar(versionF, "v", false, "print version")
 	flag.StringVar(&endpoint, "endpoint", defaultEnvString("S3WWW_ENDPOINT", ""), "AWS S3 compatible server endpoint")
 	flag.StringVar(&bucket, "bucket", defaultEnvString("S3WWW_BUCKET", ""), "bucket name with static files")
 	flag.StringVar(&bucketPath, "bucketPath", defaultEnvString("S3WWW_BUCKET_PATH", "/"), "bucket path to serve static files from")
@@ -193,6 +200,11 @@ func NewCustomHTTPTransport() *http.Transport {
 func main() {
 	flag.Parse()
 
+	if *versionF {
+		fmt.Println("s3www -", version)
+		os.Exit(0)
+	}
+
 	if strings.TrimSpace(bucket) == "" {
 		log.Fatalln(`Bucket name cannot be empty, please provide 's3www -bucket "mybucket"'`)
 	}