fix: builds for non 64 bit linux arch

The scoutfs backend is only supported on 64bit linux.  This corrects
the build constraints to only supported linux arch, and prevents the
incompatible import for unspported arch.

We also need to adjust the body limit setting on 32 bit since this
is an int, and our default limit will overfow on 32 bit.

backend/scoutfs/scoutfs.go

@@ -30,7 +30,6 @@ import (
 	"github.com/aws/aws-sdk-go-v2/service/s3"
 	"github.com/aws/aws-sdk-go-v2/service/s3/types"
 	"github.com/pkg/xattr"
-	"github.com/versity/scoutfs-go"
 	"github.com/versity/versitygw/backend"
 	"github.com/versity/versitygw/backend/posix"
 	"github.com/versity/versitygw/s3err"
@@ -188,7 +187,7 @@ func (s *ScoutFS) CompleteMultipartUpload(_ context.Context, input *s3.CompleteM
 		// scoutfs move data is a metadata only operation that moves the data
 		// extent references from the source, appeding to the destination.
 		// this needs to be 4k aligned.
-		err = scoutfs.MoveData(pf, f.f)
+		err = moveData(pf, f.f)
 		pf.Close()
 		if err != nil {
 			return nil, fmt.Errorf("move blocks part %v: %v", p.PartNumber, err)
@@ -392,7 +391,7 @@ func (s *ScoutFS) HeadObject(_ context.Context, input *s3.HeadObjectInput) (*s3.
 
 		// Check if there are any offline exents associated with this file.
 		// If so, we will set storage class to glacier.
-		st, err := scoutfs.StatMore(objPath)
+		st, err := statMore(objPath)
 		if errors.Is(err, fs.ErrNotExist) {
 			return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 		}
@@ -466,7 +465,7 @@ func (s *ScoutFS) GetObject(_ context.Context, input *s3.GetObjectInput, writer
 	if s.glaciermode {
 		// Check if there are any offline exents associated with this file.
 		// If so, we will return the InvalidObjectState error.
-		st, err := scoutfs.StatMore(objPath)
+		st, err := statMore(objPath)
 		if errors.Is(err, fs.ErrNotExist) {
 			return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 		}
@@ -666,7 +665,7 @@ func (s *ScoutFS) fileToObj(bucket string) backend.GetObjFunc {
 		if s.glaciermode {
 			// Check if there are any offline exents associated with this file.
 			// If so, we will return the InvalidObjectState error.
-			st, err := scoutfs.StatMore(objPath)
+			st, err := statMore(objPath)
 			if errors.Is(err, fs.ErrNotExist) {
 				return types.Object{}, backend.ErrSkipObj
 			}

backend/scoutfs/scoutfs_compat.go

@@ -12,6 +12,8 @@
 // specific language governing permissions and limitations
 // under the License.
 
+//go:build linux && amd64
+
 package scoutfs
 
 import (
@@ -26,6 +28,7 @@ import (
 
 	"golang.org/x/sys/unix"
 
+	"github.com/versity/scoutfs-go"
 	"github.com/versity/versitygw/backend/posix"
 )
 
@@ -182,3 +185,25 @@ func (tmp *tmpfile) Write(b []byte) (int, error) {
 func (tmp *tmpfile) cleanup() {
 	tmp.f.Close()
 }
+
+func moveData(from *os.File, to *os.File) error {
+	return scoutfs.MoveData(from, to)
+}
+
+func statMore(path string) (stat, error) {
+	st, err := scoutfs.StatMore(path)
+	if err != nil {
+		return stat{}, err
+	}
+	var s stat
+
+	s.Meta_seq = st.Meta_seq
+	s.Data_seq = st.Data_seq
+	s.Data_version = st.Data_version
+	s.Online_blocks = st.Online_blocks
+	s.Offline_blocks = st.Offline_blocks
+	s.Crtime_sec = st.Crtime_sec
+	s.Crtime_nsec = st.Crtime_nsec
+
+	return s, nil
+}

backend/scoutfs/scoutfs_incompat.go

@@ -12,6 +12,8 @@
 // specific language governing permissions and limitations
 // under the License.
 
+//go:build !(linux && amd64)
+
 package scoutfs
 
 import (
@@ -46,3 +48,11 @@ func (tmp *tmpfile) Write(b []byte) (int, error) {
 
 func (tmp *tmpfile) cleanup() {
 }
+
+func moveData(from *os.File, to *os.File) error {
+	return errNotSupported
+}
+
+func statMore(path string) (stat, error) {
+	return stat{}, errNotSupported
+}

backend/scoutfs/stat.go

@@ -14,35 +14,12 @@
 
 package scoutfs
 
-import (
-	"errors"
-	"fmt"
-	"os"
-)
-
-func New(rootdir string, opts ...Option) (*ScoutFS, error) {
-	return nil, fmt.Errorf("scoutfs only available on linux")
-}
-
-type tmpfile struct {
-	f *os.File
-}
-
-var (
-	errNotSupported = errors.New("not supported")
-)
-
-func openTmpFile(dir, bucket, obj string, size int64) (*tmpfile, error) {
-	return nil, errNotSupported
-}
-
-func (tmp *tmpfile) link() error {
-	return errNotSupported
-}
-
-func (tmp *tmpfile) Write(b []byte) (int, error) {
-	return 0, errNotSupported
-}
-
-func (tmp *tmpfile) cleanup() {
+type stat struct {
+	Meta_seq       uint64
+	Data_seq       uint64
+	Data_version   uint64
+	Online_blocks  uint64
+	Offline_blocks uint64
+	Crtime_sec     uint64
+	Crtime_nsec    uint32
 }

cmd/versitygw/main.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"strconv"
 
 	"github.com/gofiber/fiber/v2"
 	"github.com/urfave/cli/v2"
@@ -193,10 +194,17 @@ func initFlags() []cli.Flag {
 }
 
 func runGateway(ctx *cli.Context, be backend.Backend, s auth.Storer) error {
+	// int32 max for 32 bit arch
+	blimit := int64(2*1024*1024*1024 - 1)
+	if strconv.IntSize > 32 {
+		// 5GB max for 64 bit arch
+		blimit = int64(5 * 1024 * 1024 * 1024)
+	}
+
 	app := fiber.New(fiber.Config{
 		AppName:      "versitygw",
 		ServerHeader: "VERSITYGW",
-		BodyLimit:    5 * 1024 * 1024 * 1024,
+		BodyLimit:    int(blimit),
 	})
 
 	var opts []s3api.Option