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Vendoring Third Party Components
================================
The firefox source tree vendors many third party dependencies. The build system
provides a normalized way to keep track of:
1. The upstream source license, location and revision
2. (Optionally) The upstream source modification, including
1. Mozilla-specific patches
2. Custom update actions, such as excluding some files, moving files around
etc.
This is done through a descriptive ``moz.yaml`` file added to the third
party sources, and the use of:
.. code-block:: sh
./mach vendor [options] ./path/to/moz.yaml
to interact with it.
Template ``moz.yaml`` file
==========================
.. literalinclude:: template.yaml
:language: YAML
Common Vendoring Operations
===========================
Update to the latest upstream revision:
.. code-block:: sh
./mach vendor /path/to/moz.yaml
Check for latest revision, returning no output if it is up-to-date, and a
version identifier if it needs to be updated:
.. code-block:: sh
./mach vendor /path/to/moz.yaml --check-for-update
Vendor a specific revision:
.. code-block:: sh
./mach vendor /path/to/moz.yaml -r $REVISION --force
In the presence of patches, two steps are needed:
1. Vendor without applying patches (patches are applied *after*
``update-actions``) through ``--patch-mode none``
2. Apply patches on updated sources through ``--patch -mode only``
In the absence of patches, a single step is needed, and no extra argument is
required.
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