fix

install.sh

@@ -11,11 +11,11 @@ function bootstrap {
   if [[ ! -d "$DESTINATION/miaou-bash" ]]; then
     local temp_dir
     temp_dir=$(mktemp -d)
-    pushd "$temp_dir" || return 2
+    pushd "$temp_dir" >/dev/null || return 2
     curl -s -O $MAIN_TAR_GZ_URL
     tar -xzf main.tar.gz --directory "$DESTINATION"
     echo "directory: miaou-bash successfully deployed to $DESTINATION"
-    popd || return 3
+    popd >/dev/null || return 3
   fi
 
   local source_bin="$DESTINATION/miaou-bash/bin/miaou-bash"
@@ -32,5 +32,9 @@ function bootstrap {
 
 [[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
 
-[[ -v MIAOU_BASH_DIR ]] || bootstrap
+if [[ -v MIAOU_BASH_DIR ]]; then
+  bootstrap
   miaou-bash "$MIAOU_BASH_DIR/lib/init.bash"
+else
+  miaou-bash "$MIAOU_BASH_DIR/lib/self-upgrade.bash"
+fi