diff --git a/lib/devmode.bash b/lib/devmode.bash
new file mode 100755
index 0000000..891c5a7
--- /dev/null
+++ b/lib/devmode.bash
@@ -0,0 +1,48 @@
+#!/usr/bin/env miaou-bash
+
+# Constants
+GIT_URL=https://git.artcode.re/miaou/miaou-bash
+
+# Functions
+
+function assert_normal_user {
+  [[ "$UID" -eq 0 ]] && echo 'normal user expected' && return 1
+  true
+}
+
+function assert_credentials {
+  local base_url
+  base_url=$(echo "$GIT_URL" | cut -d/ -f3)
+  if ! ssh -T "git@${base_url}"; then
+    echo "credentials missing: $base_url"
+    return 2
+  fi
+}
+
+function assert_system_mode {
+  [[ -L "$MIAOU_BASH_DIR" ]] && echo "already in develoment mode: $(realpath $MIAOU_BASH_DIR)" && return 3
+  true
+}
+
+function dev_mode {
+  git clone "$GIT_URL"
+  sudo rm "$MIAOU_BASH_DIR" -rf
+  sudo ln -s "$target" "$MIAOU_BASH_DIR"
+  sudo "$MIAOU_BASH_DIR"/lib/init.sh
+}
+
+function assert_reachable_target {
+  sudo -u nobody test -x "$target"
+}
+
+# Main
+
+assert_normal_user
+assert_system_mode
+assert_credentials
+target="$PWD"/
+target+=$(echo "$GIT_URL" | cut -d/ -f5)
+source "$MIAOU_BASH_DIR"/lib/functions.bash
+_confirm_destructive "target directory will be: ${target}"
+assert_reachable_target
+dev_mode