Never show warning dialog box in command-line pkg installs.

Also,
 - add Background Music Device.driver to the array of bundles in
   pkgbuild.plist, and
 - don't warn about the permissions of the install dir for BGMXPCHelper
   in build_and_install.sh if it's only building.

build_and_install.sh

@@ -123,7 +123,6 @@ APP_PATH="/Applications"
 APP_DIR="Background Music.app"
 DRIVER_PATH="/Library/Audio/Plug-Ins/HAL"
 DRIVER_DIR="Background Music Device.driver"
-XPC_HELPER_PATH="$(BGMApp/BGMXPCHelper/safe_install_dir.sh)"
 XPC_HELPER_DIR="BGMXPCHelper.xpc"
 
 GENERAL_ERROR_MSG="Internal script error. Probably a bug in this script."
@@ -252,7 +251,6 @@ parse_options() {
                 # The dirs xcodebuild will build in.
                 APP_PATH="./BGMApp/build"
                 DRIVER_PATH="./BGMDriver/build"
-                XPC_HELPER_PATH="${APP_PATH}"
                 ;;
             w)
                 # TODO: What if they also pass their own OTHER_CFLAGS with -x?
@@ -540,6 +538,8 @@ fi
 
 # Print initial message.
 if [[ "${XCODEBUILD_ACTION}" == "install" ]]; then
+    XPC_HELPER_PATH="$(BGMApp/BGMXPCHelper/safe_install_dir.sh)"
+
     echo "$(bold_face About to install Background Music). Please pause all audio, if you can."
     [[ "${CONFIGURATION}" == "Debug" ]] && echo "Debug build."
     echo
@@ -550,6 +550,8 @@ if [[ "${XCODEBUILD_ACTION}" == "install" ]]; then
     echo " - /Library/LaunchDaemons/com.bearisdriving.BGM.XPCHelper.plist"
     echo
 elif [[ "${XCODEBUILD_ACTION}" == "build" ]]; then
+    XPC_HELPER_PATH="${APP_PATH}"
+
     echo "$(bold_face Building Background Music...)"
     echo
 fi

pkg/pkgbuild.plist

@@ -5,6 +5,13 @@
     <dict>
       <key>RootRelativeBundlePath</key>      <string>Applications/Background Music.app</string>
       <key>BundleHasStrictIdentifier</key>   <false/>
+      <key>BundleIsRelocatable</key>         <true/>
+      <key>BundleIsVersionChecked</key>      <false/>
+      <key>BundleOverwriteAction</key>       <string>upgrade</string>
+    </dict>
+    <dict>
+      <key>RootRelativeBundlePath</key>      <string>Library/Audio/Plug-Ins/HAL/Background Music Device.driver</string>
+      <key>BundleHasStrictIdentifier</key>   <false/>
       <key>BundleIsRelocatable</key>         <false/>
       <key>BundleIsVersionChecked</key>      <false/>
       <key>BundleOverwriteAction</key>       <string>upgrade</string>

pkg/preinstall

@@ -35,18 +35,24 @@ if [ "$(bash safe_install_dir.sh "$xpc_helper_path")" != "1" ]; then
     msg+="group 'wheel', and have permissions 755 (rwxr-xr-x).\n\n"
     msg+="Background Music will still work if you decide to continue."
 
-    if ! osascript <<EOT
-        tell application id "com.apple.systemuiserver"
-            display alert "Warning" \
-                message "$msg" \
-                buttons {"Cancel", "Install Anyway"} \
-                default button "Cancel" \
-                cancel button "Cancel" \
-                as warning
-        end tell
-EOT
-    then
+    if [ "$COMMAND_LINE_INSTALL" == "1" ]; then
+        # As far as I can tell, we can't print anything the user is likely to see.
+        logger "WARNING: $msg"
         exit 1
+    else
+        if ! osascript <<EOT
+            tell application id "com.apple.systemuiserver"
+                display alert "Warning" \
+                    message "$msg" \
+                    buttons {"Cancel", "Install Anyway"} \
+                    default button "Cancel" \
+                    cancel button "Cancel" \
+                    as warning
+            end tell
+EOT
+        then
+            exit 1
+        fi
     fi
 fi