unbreak glob pattern in floppy_files

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>

common/floppy_config.go

@@ -3,6 +3,8 @@ package common
 import (
 	"fmt"
 	"os"
+	"path/filepath"
+	"strings"
 
 	"github.com/mitchellh/packer/template/interpolate"
 )
@@ -14,13 +16,19 @@ type FloppyConfig struct {
 
 func (c *FloppyConfig) Prepare(ctx *interpolate.Context) []error {
 	var errs []error
+	var err error
 
 	if c.FloppyFiles == nil {
 		c.FloppyFiles = make([]string, 0)
 	}
 
 	for _, path := range c.FloppyFiles {
-		if _, err := os.Stat(path); err != nil {
+		if strings.IndexAny(path, "*?[") >= 0 {
+			_, err = filepath.Glob(path)
+		} else {
+			_, err = os.Stat(path)
+		}
+		if err != nil {
 			errs = append(errs, fmt.Errorf("Bad Floppy disk file '%s': %s", path, err))
 		}
 	}
@@ -30,7 +38,12 @@ func (c *FloppyConfig) Prepare(ctx *interpolate.Context) []error {
 	}
 
 	for _, path := range c.FloppyDirectories {
-		if _, err := os.Stat(path); err != nil {
+		if strings.IndexAny(path, "*?[") >= 0 {
+			_, err = filepath.Glob(path)
+		} else {
+			_, err = os.Stat(path)
+		}
+		if err != nil {
 			errs = append(errs, fmt.Errorf("Bad Floppy disk directory '%s': %s", path, err))
 		}
 	}