post-processor/vagrant: properly close file handles [GH-100]

CHANGELOG.md

@@ -22,6 +22,8 @@ BUG FIXES:
   the output path.
 * vagrant: Properly configure the provider-specific post-processors so
   things like `vagrantfile_template` work. [GH-129]
+* vagrant: Close filehandles when copying files so Windows can
+  rename files. [GH-100]
 
 ## 0.1.4 (July 2, 2013)
 

post-processor/vagrant/util.go

@@ -21,6 +21,27 @@ type OutputPathTemplate struct {
 	Provider   string
 }
 
+// Copies a file by copying the contents of the file to another place.
+func CopyContents(dst, src string) error {
+	srcF, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer srcF.Close()
+
+	dstF, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer dstF.Close()
+
+	if _, err := io.Copy(dstF, srcF); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // DirToBox takes the directory and compresses it into a Vagrant-compatible
 // box. This function does not perform checks to verify that dir is
 // actually a proper box. This is an expected precondition.

post-processor/vagrant/virtualbox.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"github.com/mitchellh/mapstructure"
 	"github.com/mitchellh/packer/packer"
-	"io"
 	"io/ioutil"
 	"log"
 	"os"
@@ -66,19 +65,9 @@ func (p *VBoxBoxPostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifac
 	// Copy all of the original contents into the temporary directory
 	for _, path := range artifact.Files() {
 		ui.Message(fmt.Sprintf("Copying: %s", path))
-		src, err := os.Open(path)
-		if err != nil {
-			return nil, false, err
-		}
-		defer src.Close()
-
-		dst, err := os.Create(filepath.Join(dir, filepath.Base(path)))
-		if err != nil {
-			return nil, false, err
-		}
-		defer dst.Close()
 
-		if _, err := io.Copy(dst, src); err != nil {
+		dstPath := filepath.Join(dir, filepath.Base(path))
+		if err := CopyContents(dstPath, path); err != nil {
 			return nil, false, err
 		}
 	}

post-processor/vagrant/vmware.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"github.com/mitchellh/mapstructure"
 	"github.com/mitchellh/packer/packer"
-	"io"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -51,19 +50,9 @@ func (p *VMwareBoxPostProcessor) PostProcess(ui packer.Ui, artifact packer.Artif
 	// Copy all of the original contents into the temporary directory
 	for _, path := range artifact.Files() {
 		ui.Message(fmt.Sprintf("Copying: %s", path))
-		src, err := os.Open(path)
-		if err != nil {
-			return nil, false, err
-		}
-		defer src.Close()
-
-		dst, err := os.Create(filepath.Join(dir, filepath.Base(path)))
-		if err != nil {
-			return nil, false, err
-		}
-		defer dst.Close()
 
-		if _, err := io.Copy(dst, src); err != nil {
+		dstPath := filepath.Join(dir, filepath.Base(path))
+		if err := CopyContents(dstPath, path); err != nil {
 			return nil, false, err
 		}
 	}