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.. SPDX-License-Identifier: CC-BY-SA-4.0

Environment variables
=====================

The libcamera behaviour can be tuned through environment variables. This
document lists all the available variables and describes their usage.

List of variables
-----------------

LIBCAMERA_LOG_FILE
   The custom destination for log output.

   Example value: ``/home/{user}/camera_log.log``

LIBCAMERA_LOG_LEVELS
   Configure the verbosity of log messages for different categories (`more <#log-levels>`__).

   Example value: ``*:DEBUG``

LIBCAMERA_IPA_CONFIG_PATH
   Define custom search locations for IPA configurations (`more <#ipa-configuration>`__).

   Example value: ``${HOME}/.libcamera/share/ipa:/opt/libcamera/vendor/share/ipa``

LIBCAMERA_IPA_MODULE_PATH
   Define custom search locations for IPA modules (`more <#ipa-module>`__).

   Example value: ``${HOME}/.libcamera/lib:/opt/libcamera/vendor/lib``

Further details
---------------

Notes about debugging
~~~~~~~~~~~~~~~~~~~~~

The environment variables `LIBCAMERA_LOG_FILE` and `LIBCAMERA_LOG_LEVELS` are
used to modify the destination and verbosity of messages provided by libcamera.

The `LIBCAMERA_LOG_LEVELS` variable accepts a comma-separated list of
'category:level' pairs.