implement version, and fix build by updating stacker

Signed-off-by: Serge Hallyn <[email protected]>

Author: hallyn

Makefile

@@ -0,0 +1,25 @@
+all: atomfs
+
+MAIN_VERSION ?= $(shell git describe --always --dirty || echo no-git)
+ifeq ($(MAIN_VERSION),$(filter $(MAIN_VERSION), "", no-git))
+$(error "Bad value for MAIN_VERSION: '$(MAIN_VERSION)'")
+endif
+
+GO_SRC_DIRS := .
+
+GO_SRC := $(shell find $(GO_SRC_DIRS) -name "*.go")
+
+VERSION_LDFLAGS=-X main.Version=$(MAIN_VERSION)
+
+.PHONY: gofmt
+gofmt: .made-gofmt
+.made-gofmt: $(GO_SRC)
+	o=$$(gofmt -l -w $(GO_SRC_DIRS) 2>&1) && [ -z "$$o" ] || \
+		{ echo "gofmt made changes: $$o" 1>&2; exit 1; }
+	@touch $@
+
+atomfs: .made-gofmt $(GO_SRC)
+	go build -buildvcs=false -ldflags "$(VERSION_LDFLAGS)" -o atomfs ./...
+
+clean:
+	rm -f atomfs

main.go

@@ -8,7 +8,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-const Version = "0.1"
+var Version string
 
 func main() {
 	app := cli.NewApp()

mount.go

@@ -6,15 +6,15 @@ import (
 	"strings"
 	"syscall"
 
-	"golang.org/x/sys/unix"
 	"github.com/urfave/cli"
+	"golang.org/x/sys/unix"
 	satomfs "stackerbuild.io/stacker/pkg/atomfs"
 )
 
 var mountCmd = cli.Command{
-	Name:    "mount",
-	Usage:   "mount atomfs image",
-	Action:  doMount,
+	Name:   "mount",
+	Usage:  "mount atomfs image",
+	Action: doMount,
 	Flags: []cli.Flag{
 		cli.BoolFlag{
 			Name:  "ro",
@@ -62,10 +62,10 @@ func doMount(ctx *cli.Context) error {
 	}
 
 	opts := satomfs.MountOCIOpts{
-		OCIDir: ocidir,
+		OCIDir:       ocidir,
 		MetadataPath: metadir,
-		Tag: tag,
-		Target: rodest,
+		Tag:          tag,
+		Target:       rodest,
 	}
 
 	mol, err := satomfs.BuildMoleculeFromOCI(opts)

umount.go

@@ -11,9 +11,9 @@ import (
 )
 
 var umountCmd = cli.Command{
-	Name:    "umount",
-	Usage:   "unmount atomfs image",
-	Action:  doUmount,
+	Name:   "umount",
+	Usage:  "unmount atomfs image",
+	Action: doUmount,
 }
 
 func umountUsage(me string) error {