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+==================
+Runtime Management
+==================
+
+The runtimes are managed with asdf and are activated in this project via the
+`.tool-versions <.tool-versions>`_. If you have not yet installed asdf_, then
+chapter :ref:`introduce asdf` may be of help to you.
+
+.. contents::
+ :depth: 2
+ :local:
+ :backlinks: entry
+
+
+Get started
+===========
+
+If you have asdf installed you can install the runtimes of this project by:
+
+.. code:: bash
+
+ $ cd /path/to/searxng
+ $ asdf install # will install runtimes listed in .tool-versions
+ ...
+
+Manage Versions
+===============
+
+If you want to perform a ``test`` with special runtime versions of nodejs,
+python or shellcheck, you can patch the ``.tool-versions``:
+
+.. code:: diff
+
+ --- a/.tool-versions
+ +++ b/.tool-versions
+ @@ -1,2 +1,2 @@
+ -python 3.12.0
+ -shellcheck 0.9.0
+ +python 3.11.6
+ +shellcheck 0.8.0
+
+To install use ``asdf install`` again. If the runtime tools have changed, any
+existing (nodejs and python) environments should be cleaned up with a ``make
+clean``.
+
+.. code:: bash
+
+ $ asdf install
+ ...
+ $ make clean test
+
+
+.. _introduce asdf:
+
+Introduce asdf
+==============
+
+To `download asdf`_ and `install asdf`_:
+
+.. code:: bash
+
+ $ git clone https://github.com/asdf-vm/asdf.git ~/.asdf --branch <version>
+ $ echo '. "$HOME/.asdf/asdf.sh"' >> ~/.bashrc
+ $ echo '. "$HOME/.asdf/completions/asdf.bash"' >> ~/.bashrc
+
+Start a new shell and try to `install plugins`_:
+
+.. code:: bash
+
+ $ asdf plugin-list-all | grep -E '(golang|python|nodejs|shellcheck).git'
+ golang https://github.com/asdf-community/asdf-golang.git
+ nodejs https://github.com/asdf-vm/asdf-nodejs.git
+ python https://github.com/danhper/asdf-python.git
+ shellcheck https://github.com/luizm/asdf-shellcheck.git
+
+ $ asdf plugin add golang https://github.com/asdf-community/asdf-golang.git
+ $ asdf plugin add nodejs https://github.com/asdf-vm/asdf-nodejs.git
+ $ asdf plugin add python https://github.com/danhper/asdf-python.git
+ $ asdf plugin add shellcheck https://github.com/luizm/asdf-shellcheck.git
+
+Each plugin has dependencies, to compile runtimes visit the URLs from above and
+look out for the dependencies you need to install on your OS, on Debian for the
+runtimes listed above you will need:
+
+.. code:: bash
+
+ $ sudo apt update
+ $ sudo apt install \
+ dirmngr gpg curl gawk coreutils build-essential libssl-dev zlib1g-dev \
+ libbz2-dev libreadline-dev libsqlite3-dev \
+ libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev
+
+With dependencies installed you can install/compile runtimes:
+
+.. code:: bash
+
+ $ asdf install golang latest
+ $ asdf install nodejs latest
+ $ asdf install python latest
+ $ asdf install shellcheck latest
+
+Python will be compiled and will take a while.
+
+In the repository the version is defined in `.tool-versions`_. Outside the
+repository, its recommended that the runtime should use the versions of the OS
+(`Fallback to System Version`_) / if not already done register the system
+versions global:
+
+.. code:: bash
+
+ $ cd /
+ $ asdf global golang system
+ $ asdf global nodejs system
+ $ asdf global python system
+ $ asdf global shellcheck system
+
+.. _asdf: https://asdf-vm.com/
+.. _download asdf: https://asdf-vm.com/guide/getting-started.html#_2-download-asdf
+.. _install asdf: https://asdf-vm.com/guide/getting-started.html#_3-install-asdf
+.. _install plugins: https://asdf-vm.com/guide/getting-started.html#install-the-plugin
+.. _Fallback to System Version: https://asdf-vm.com/manage/versions.html#fallback-to-system-version