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+.. _mozinfo:
+
+=======
+mozinfo
+=======
+
+``mozinfo`` is a solution for representing a subset of build
+configuration and run-time data.
+
+``mozinfo`` data is typically accessed through a ``mozinfo.json`` file
+which is written to the :term:`object directory` during build
+configuration. The code for writing this file lives in
+:py:mod:`mozbuild.mozinfo`.
+
+``mozinfo.json`` is an object/dictionary of simple string values.
+
+The attributes in ``mozinfo.json`` are used for many purposes. One use
+is to filter tests for applicability to the current build. For more on
+this, see :ref:`test_manifests`.
+
+.. _mozinfo_attributes:
+
+mozinfo.json Attributes
+=================================
+
+``mozinfo`` currently records the following attributes.
+
+appname
+   The application being built.
+
+   Value comes from ``MOZ_APP_NAME`` from ``config.status``.
+
+   Optional.
+
+asan
+   Whether address sanitization is enabled.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+bin_suffix
+   The file suffix for binaries produced with this build.
+
+   Values may be an empty string, as not all platforms have a binary
+   suffix.
+
+   Always defined.
+
+bits
+   The number of bits in the CPU this build targets.
+
+   Values are typically ``32`` or ``64``.
+
+   Universal Mac builds do not have this key defined.
+
+   Unknown processor architectures (see ``processor`` below) may not have
+   this key defined.
+
+   Optional.
+
+buildapp
+   The path to the XUL application being built.
+
+   For desktop Firefox, this is ``browser``. For Fennec, it's
+   ``mobile/android``.
+
+crashreporter
+   Whether the crash reporter is enabled for this build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+datareporting
+   Whether data reporting (MOZ_DATA_REPORTING) is enabled for this build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+debug
+   Whether this is a debug build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+devedition
+   Whether this is a devedition build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+healthreport
+   Whether the Health Report feature is enabled.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+mozconfig
+   The path of the :ref:`mozconfig file <mozconfig>` used to produce this build.
+
+   Optional.
+
+nightly_build
+   Whether this is a nightly build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+os
+   The operating system the build is produced for. Values for tier-1
+   supported platforms are ``linux``, ``win``, ``mac``, and
+   ``android``. For other platforms, the value is the lowercase version
+   of the ``OS_TARGET`` variable from ``config.status``.
+
+   Always defined.
+
+processor
+   Information about the processor architecture this build targets.
+
+   Values come from ``TARGET_CPU``, however some massaging may be
+   performed.
+
+   If the build is a universal build on Mac (it targets both 32-bit and
+   64-bit), the value is ``universal-x86-x86_64``.
+
+   If the value starts with ``arm``, the value is ``arm``.
+
+   If the value starts with a string of the form ``i[3-9]86]``, the
+   value is ``x86``.
+
+   Always defined.
+
+release_or_beta
+   Whether this is a release or beta build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+stylo
+   Whether the Stylo styling system is being used.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+tests_enabled
+   Whether tests are enabled for this build.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.
+
+toolkit
+   The widget toolkit in case. The value comes from the
+   ``MOZ_WIDGET_TOOLKIT`` ``config.status`` variable.
+
+   Always defined.
+
+topsrcdir
+   The path to the source directory the build came from.
+
+   Always defined.
+
+topobjdir
+   The path to the obj directory the build came from.
+
+   Always defined.
+
+webrender
+   Whether or not WebRender is enabled as the Gecko compositor.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.