swarm/api: fix build/tests on unsupported platforms

Skip FUSE tests if FUSE is unavailable and change build constraints so
the 'lesser' platforms aren't mentioned explicitly. The test are
compiled on all platforms to prevent regressions in _fallback.go

Also gofmt -w -s because why not.

swarm/api/fuse.go

@@ -29,9 +29,6 @@ import (
 	"golang.org/x/net/context"
 )
 
-
-
-
 // Data structures used for Fuse filesystem, serving directories and serving files to Fuse driver
 type FS struct {
 	root *Dir
@@ -55,7 +52,6 @@ type File struct {
 	reader   storage.LazySectionReader
 }
 
-
 // Functions which satisfy the Fuse File System requests
 func (filesystem *FS) Root() (fs.Node, error) {
 	return filesystem.root, nil
@@ -104,14 +100,12 @@ func (d *Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
 }
 
 func (file *File) Attr(ctx context.Context, a *fuse.Attr) error {
-
 	a.Inode = file.inode
 	//TODO: need to get permission as argument
 	a.Mode = 0500
 	a.Uid = uint32(os.Getuid())
 	a.Gid = uint32(os.Getegid())
 
-
 	reader := file.swarmApi.Retrieve(file.key)
 	quitC := make(chan bool)
 	size, err := reader.Size(quitC)
@@ -135,5 +129,4 @@ func (file *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.Re
 	}
 	resp.Data = buf[:n]
 	return err
-
 }

swarm/api/swarmfs.go

@@ -17,25 +17,22 @@
 package api
 
 import (
-	"time"
 	"sync"
+	"time"
 )
 
 const (
 	Swarmfs_Version = "0.1"
-	mountTimeout   = time.Second * 5
+	mountTimeout    = time.Second * 5
-	maxFuseMounts  = 5
+	maxFuseMounts   = 5
 )
 
-
 type SwarmFS struct {
 	swarmApi     *Api
 	activeMounts map[string]*MountInfo
 	activeLock   *sync.RWMutex
 }
 
-
-
 func NewSwarmFS(api *Api) *SwarmFS {
 	swarmfs := &SwarmFS{
 		swarmApi:     api,
@@ -44,5 +41,3 @@ func NewSwarmFS(api *Api) *SwarmFS {
 	}
 	return swarmfs
 }
-
-

swarm/api/swarmfs_fallback.go

@@ -14,35 +14,35 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// +build windows
+// +build !linux,!darwin,!freebsd
 
 package api
 
 import (
-	"github.com/ethereum/go-ethereum/log"
+	"errors"
 )
 
-// Dummy struct and functions to satsfy windows build
+var errNoFUSE = errors.New("FUSE is not supported on this platform")
-type MountInfo struct {
+
+func isFUSEUnsupportedError(err error) bool {
+	return err == errNoFUSE
 }
 
+// Dummy struct and functions to satsfy windows build
+type MountInfo struct{}
 
 func (self *SwarmFS) Mount(mhash, mountpoint string) error {
-	log.Info("Platform not supported")
+	return errNoFUSE
-	return nil
 }
 
 func (self *SwarmFS) Unmount(mountpoint string) error {
-	log.Info("Platform not supported")
+	return errNoFUSE
-	return nil
 }
 
 func (self *SwarmFS) Listmounts() (string, error) {
-	log.Info("Platform not supported")
+	return "", errNoFUSE
-	return "",nil
 }
 
 func (self *SwarmFS) Stop() error {
-	log.Info("Platform not supported")
 	return nil
 }

swarm/api/swarmfs_test.go

@@ -14,8 +14,6 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// +build linux darwin
-
 package api
 
 import (
@@ -35,7 +33,6 @@ func testFuseFileSystem(t *testing.T, f func(*FileSystem)) {
 }
 
 func createTestFiles(t *testing.T, files []string) {
-
 	os.RemoveAll(testUploadDir)
 	os.RemoveAll(testMountDir)
 	defer os.MkdirAll(testMountDir, 0777)
@@ -58,9 +55,7 @@ func createTestFiles(t *testing.T, files []string) {
 }
 
 func compareFiles(t *testing.T, files []string) {
-
 	for f := range files {
-
 		sourceFile := filepath.Join(testUploadDir, files[f])
 		destinationFile := filepath.Join(testMountDir, files[f])
 
@@ -81,12 +76,10 @@ func compareFiles(t *testing.T, files []string) {
 		if dfinfo.Mode().Perm().String() != "-r-x------" {
 			t.Fatalf("Permission is not 0500for file: %v", err)
 		}
-
 	}
 }
 
 func doHashTest(fs *FileSystem, t *testing.T, ensName string, files ...string) {
-
 	createTestFiles(t, files)
 	bzzhash, err := fs.Upload(testUploadDir, "")
 	if err != nil {
@@ -94,29 +87,29 @@ func doHashTest(fs *FileSystem, t *testing.T, ensName string, files ...string) {
 	}
 
 	swarmfs := NewSwarmFS(fs.api)
-	_ ,err1 := swarmfs.Mount(bzzhash, testMountDir)
+	defer swarmfs.Stop()
-	if err1 != nil {
 
-		t.Fatalf("Error mounting hash  %v: %v", bzzhash, err)
+	_, err = swarmfs.Mount(bzzhash, testMountDir)
+	if isFUSEUnsupportedError(err) {
+		t.Skip("FUSE not supported:", err)
+	} else if err != nil {
+		t.Fatalf("Error mounting hash %v: %v", bzzhash, err)
 	}
+
 	compareFiles(t, files)
-	_, err2 := swarmfs.Unmount(testMountDir)
-	if err2 != nil {
-		t.Fatalf("Error unmounting path  %v: %v", testMountDir, err)
-	}
-	swarmfs.Stop()
 
+	if _, err := swarmfs.Unmount(testMountDir); err != nil {
+		t.Fatalf("Error unmounting path %v: %v", testMountDir, err)
+	}
 }
 
 // mounting with manifest Hash
 func TestFuseMountingScenarios(t *testing.T) {
 	testFuseFileSystem(t, func(fs *FileSystem) {
-
 		//doHashTest(fs,t, "test","1.txt")
 		doHashTest(fs, t, "", "1.txt")
 		doHashTest(fs, t, "", "1.txt", "11.txt", "111.txt", "two/2.txt", "two/two/2.txt", "three/3.txt")
 		doHashTest(fs, t, "", "1/2/3/4/5/6/7/8/9/10/11/12/1.txt")
 		doHashTest(fs, t, "", "one/one.txt", "one.txt", "once/one.txt", "one/one/one.txt")
-
 	})
 }

swarm/api/swarmfs_unix.go

@@ -14,29 +14,37 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// +build linux darwin
+// +build linux darwin freebsd
 
 package api
 
 import (
-	"path/filepath"
 	"fmt"
+	"os"
+	"path/filepath"
 	"strings"
-	"time"
-	"github.com/ethereum/go-ethereum/swarm/storage"
-	"bazil.org/fuse"
-	"github.com/ethereum/go-ethereum/log"
-	"github.com/ethereum/go-ethereum/common"
-	"bazil.org/fuse/fs"
 	"sync"
-)
+	"time"
 
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/swarm/storage"
+)
 
 var (
-	inode  uint64  = 1
+	inode     uint64 = 1
-	inodeLock   sync.RWMutex
+	inodeLock sync.RWMutex
 )
 
+func isFUSEUnsupportedError(err error) bool {
+	if perr, ok := err.(*os.PathError); ok {
+		return perr.Op == "open" && perr.Path == "/dev/fuse"
+	}
+	return err == fuse.ErrOSXFUSENotFound
+}
+
 // information about every active mount
 type MountInfo struct {
 	mountPoint     string
@@ -49,15 +57,12 @@ type MountInfo struct {
 // Inode numbers need to be unique, they are used for caching inside fuse
 func NewInode() uint64 {
 	inodeLock.Lock()
-	defer  inodeLock.Unlock()
+	defer inodeLock.Unlock()
 	inode += 1
 	return inode
 }
 
-
+func (self *SwarmFS) Mount(mhash, mountpoint string) (string, error) {
-
-func (self *SwarmFS) Mount(mhash, mountpoint string) (string, error)  {
-
 	self.activeLock.Lock()
 	defer self.activeLock.Unlock()
 
@@ -110,7 +115,6 @@ func (self *SwarmFS) Mount(mhash, mountpoint string) (string, error)  {
 	dirTree["root"] = rootDir
 
 	err = trie.listWithPrefix(path, quitC, func(entry *manifestTrieEntry, suffix string) {
-
 		key = common.Hex2Bytes(entry.Hash)
 		fullpath := "/" + suffix
 		basepath := filepath.Dir(fullpath)
@@ -177,7 +181,7 @@ func (self *SwarmFS) Mount(mhash, mountpoint string) (string, error)  {
 		return err.Error(), err
 
 	case err := <-mounterr:
-	        errStr := fmt.Sprintf("Mounting %s encountered error: %v", cleanedMountPoint, err)
+		errStr := fmt.Sprintf("Mounting %s encountered error: %v", cleanedMountPoint, err)
 		log.Warn(errStr)
 		return errStr, err
 
@@ -185,8 +189,6 @@ func (self *SwarmFS) Mount(mhash, mountpoint string) (string, error)  {
 		log.Debug(fmt.Sprintf("Mounting connection succeeded for : %v", cleanedMountPoint))
 	}
 
-
-
 	//Assemble and Store the mount information for future use
 	mountInformation := &MountInfo{
 		mountPoint:     cleanedMountPoint,
@@ -203,8 +205,7 @@ func (self *SwarmFS) Mount(mhash, mountpoint string) (string, error)  {
 	return succString, nil
 }
 
-func (self *SwarmFS) Unmount(mountpoint string) (string, error)  {
+func (self *SwarmFS) Unmount(mountpoint string) (string, error) {
-
 	self.activeLock.Lock()
 	defer self.activeLock.Unlock()
 
@@ -216,7 +217,6 @@ func (self *SwarmFS) Unmount(mountpoint string) (string, error)  {
 	// Get the mount information based on the mountpoint argument
 	mountInfo := self.activeMounts[cleanedMountPoint]
 
-
 	if mountInfo == nil || mountInfo.mountPoint != cleanedMountPoint {
 		err := fmt.Errorf("Could not find mount information for %s ", cleanedMountPoint)
 		log.Warn(err.Error())
@@ -242,7 +242,6 @@ func (self *SwarmFS) Unmount(mountpoint string) (string, error)  {
 }
 
 func (self *SwarmFS) Listmounts() (string, error) {
-
 	self.activeLock.RLock()
 	defer self.activeLock.RUnlock()
 
@@ -256,7 +255,6 @@ func (self *SwarmFS) Listmounts() (string, error) {
 }
 
 func (self *SwarmFS) Stop() bool {
-
 	for mp := range self.activeMounts {
 		mountInfo := self.activeMounts[mp]
 		self.Unmount(mountInfo.mountPoint)