update go-fs

resolves #2421

vendor/github.com/mitchellh/go-fs/fat/directory_cluster.go

@@ -7,9 +7,9 @@ import (
 	"fmt"
 	"github.com/mitchellh/go-fs"
 	"math"
+	"strings"
 	"time"
 	"unicode/utf16"
-	"strings"
 )
 
 type DirectoryAttr uint8

vendor/github.com/mitchellh/go-fs/fat/super_floppy.go

@@ -72,6 +72,15 @@ func (f *superFloppyFormatter) format() error {
 			label = "FAT16   "
 		}
 
+		// For 1.44MB Floppy, for other floppy formats see https://support.microsoft.com/en-us/kb/75131.
+		// We make an exception for this most common usecase as the calculations don't create a working image for older operating systems
+		if f.config.FATType == FAT12 && f.device.Len() == 1474560 {
+			bsCommon.RootEntryCount = 224
+			bsCommon.SectorsPerFat = 9
+			bsCommon.SectorsPerTrack = 18
+			bsCommon.Media = 240
+			bsCommon.NumHeads = 2
+		} else {
 			// Determine the number of root directory entries
 			if f.device.Len() > 512*5*32 {
 				bsCommon.RootEntryCount = 512
@@ -80,6 +89,7 @@ func (f *superFloppyFormatter) format() error {
 			}
 
 			bsCommon.SectorsPerFat = f.sectorsPerFat(bsCommon.RootEntryCount, sectorsPerCluster)
+		}
 
 		bs := &BootSectorFat16{
 			BootSectorCommon:    bsCommon,

vendor/vendor.json

@@ -461,13 +461,14 @@
 		{
 			"checksumSHA1": "mVqDwKcibat0IKAdzAhfGIHPwI8=",
 			"path": "github.com/mitchellh/go-fs",
-			"revision": "4f9d2cb031e44bef60d0c00ccb3f31f68867e85e",
+			"revision": "7bae45d9a684750e82b97ff320c82556614e621b",
-			"revisionTime": "2016-09-29T19:58:49Z"
+			"revisionTime": "2016-11-08T19:11:23Z"
 		},
 		{
-			"checksumSHA1": "Z28nPI+n3iAnsqVSLCt5LZh/Zhg=",
+			"checksumSHA1": "B5dy+Lg6jFPgHYhozztz88z3b4A=",
 			"path": "github.com/mitchellh/go-fs/fat",
-			"revision": "4f9d2cb031e44bef60d0c00ccb3f31f68867e85e"
+			"revision": "7bae45d9a684750e82b97ff320c82556614e621b",
+			"revisionTime": "2016-11-08T19:11:23Z"
 		},
 		{
 			"checksumSHA1": "z235fRXw4+SW4xWgLTYc8SwkM2M=",