style(build): conform to guidelines

osx/createdmg

@@ -1,4 +1,21 @@
 #!/bin/bash
+#
+#    Copyright © 2017 The qTox Project Contributors
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set -eu -o pipefail
 
 QTOX_DIR="$1"
 

osx/update-plist-version.sh

@@ -37,7 +37,7 @@ source "../tools/lib/git.source"
 
 # append version to .plist file(s) after the right line
 update_version() {
-    ver=$(get_version)
+    local ver=$(get_version)
     defaults write "$(pwd)/info.plist" CFBundleVersion $ver
     defaults write "$(pwd)/info.plist" CFBundleShortVersionString $ver
     plutil -convert xml1 info.plist