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doc: Mention XDG_RUNTIME_DIR for IPC

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patrick96 2022-03-05 13:38:13 +01:00 committed by Patrick Ziegler
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doc/user/ipc.rst
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@ -40,6 +40,19 @@ enabled.
.. note:: IPC messages are only sent to polybar instances running under the
same user as ``polybar-msg`` is running as.
Concretely, ``polybar`` and ``polybar-msg`` use the
``$XDG_RUNTIME_DIR`` environment variable in accordance with the `XDG
Base Directory Specification`_ to determine where to find the socket
to communicate.
If ``polybar`` and ``polybar-msg`` don't have the same value for
``$XDG_RUNTIME_DIR``, they will likely not be able to communicate.
The variable may not be set if you use ``su`` or ``sudo`` to execute
``polybar-msg`` as a different user, often a full user session is
required.
.. _XDG Base Directory Specification: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
The ``<type>`` argument is either :ref:`action <ipc-actions>` or
:ref:`cmd <ipc-commands>`.
The allowed values for ``<payload>`` depend on the type.