fix OS X unzipping

insthugo/insthugo.go

@@ -195,38 +195,63 @@ func checkSHA256() {
 	fmt.Println("checked!")
 }
 
-func unzip(archive, target string) error {
-	reader, err := zip.OpenReader(archive)
+func unzip(src, dest string) error {
+	r, err := zip.OpenReader(src)
 	if err != nil {
 		return err
 	}
+	defer func() {
+		if err := r.Close(); err != nil {
+			panic(err)
+		}
+	}()
 
-	if err := os.MkdirAll(target, 0755); err != nil {
-		return err
+	os.MkdirAll(dest, 0755)
+
+	// Closure to address file descriptors issue with all the deferred .Close() methods
+	extractAndWriteFile := func(f *zip.File) error {
+		rc, err := f.Open()
+		if err != nil {
+			return err
+		}
+		defer func() {
+			if err := rc.Close(); err != nil {
+				panic(err)
+			}
+		}()
+
+		path := filepath.Join(dest, f.Name)
+
+		if f.FileInfo().IsDir() {
+			os.MkdirAll(path, f.Mode())
+		} else {
+			if _, err := os.Stat(filepath.Dir(path)); os.IsNotExist(err) {
+				os.MkdirAll(filepath.Dir(path), 0755)
+			}
+
+			f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
+			if err != nil {
+				return err
+			}
+			defer func() {
+				if err := f.Close(); err != nil {
+					panic(err)
+				}
+			}()
+			_, err = io.Copy(f, rc)
+
+			if err != nil {
+				return err
+			}
+		}
+		return nil
 	}
 
-	for _, file := range reader.File {
-		path := filepath.Join(target, file.Name)
-		if file.FileInfo().IsDir() {
-			os.MkdirAll(path, file.Mode())
-			continue
-		}
-
-		fileReader, err := file.Open()
+	for _, f := range r.File {
+		err := extractAndWriteFile(f)
 		if err != nil {
 			return err
 		}
-		defer fileReader.Close()
-
-		targetFile, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
-		if err != nil {
-			return err
-		}
-		defer targetFile.Close()
-
-		if _, err := io.Copy(targetFile, fileReader); err != nil {
-			return err
-		}
 	}
 
 	return nil