.. _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.