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diff --git a/build/docs/jar-manifests.rst b/build/docs/jar-manifests.rst new file mode 100644 index 0000000000..b6b1be781c --- /dev/null +++ b/build/docs/jar-manifests.rst @@ -0,0 +1,123 @@ +.. _jar_manifests: + +============= +JAR Manifests +============= + +JAR Manifests are plaintext files in the tree that are used to package chrome +files into ``.jar`` files and create :ref:`Chrome Registration <Chrome Registration>` +manifests. JAR Manifests are commonly named ``jar.mn``. They are declared in ``moz.build`` files using the ``JAR_MANIFESTS`` variable, which makes up a collection of ``jar.mn`` files. +All files declared in JAR Manifests are processed and installed into ``omni.ja`` files in ``browser/`` and ``toolkit/`` when building Firefox. + +``jar.mn`` files are automatically processed by the build system when building a +source directory that contains one. The ``jar.mn`` is run through the +:ref:`preprocessor` before being passed to the manifest processor. In order to +have ``@variables@`` expanded (such as ``@AB_CD@``) throughout the file, add +the line ``#filter substitution`` at the top of your ``jar.mn`` file. + +The format of a jar.mn is fairly simple; it consists of a heading specifying +which JAR file is being packaged, followed by indented lines listing files and +chrome registration instructions. + +For a simple ``jar.mn`` file, see `toolkit/profile/jar.mn <https://searchfox.org/mozilla-central/rev/5b2d2863bd315f232a3f769f76e0eb16cdca7cb0/toolkit/profile/jar.mn>`_. For a much +more complex ``jar.mn`` file, see `toolkit/locales/jar.mn <https://searchfox.org/mozilla-central/rev/5b2d2863bd315f232a3f769f76e0eb16cdca7cb0/toolkit/locales/jar.mn>`_. More examples with specific formats and uses are available below. + +Shipping Chrome Files +====================== +General Format +^^^^^^^^^^^^^^ +To ship chrome files in a JAR, an indented line indicates a file to be packaged:: + + <jarfile>.jar: + path/in/jar/file_name.xul (source/tree/location/file_name.xul) + +Note that file path mappings are listed by destination (left) followed by source (right). + +Same Directory Omission +^^^^^^^^^^^^^^^^^^^^^^^ +If the JAR manifest and packaged files live in the same directory, the source path and parentheses can be omitted. +A sample of a ``jar.mn`` file with omitted source paths and parentheses is `this revision of browser/components/colorways/jar.mn <https://searchfox.org/mozilla-central/rev/5b2d2863bd315f232a3f769f76e0eb16cdca7cb0/browser/components/colorways/jar.mn>`_:: + + browser.jar: + content/browser/colorwaycloset.html + content/browser/colorwaycloset.css + content/browser/colorwaycloset.js + +Writing the following is equivalent, given that the aforementioned files exist in the same directory as the ``jar.mn``. Notice the ``.jar`` file is named ``browser.jar``:: + + browser.jar: + content/browser/colorwaycloset.html (colorwaycloset.html) + content/browser/colorwaycloset.css (colorwaycloset.css) + content/browser/colorwaycloset.js (colorwaycloset.js) + +This manifest is responsible for packaging files needed by Colorway Closet, including +JS scripts, localization files, images (ex. PNGs, AVIFs), and CSS styling. Look at `browser/components/colorways/colorwaycloset.html <https://searchfox.org/mozilla-central/rev/5b2d2863bd315f232a3f769f76e0eb16cdca7cb0/browser/components/colorways/colorwaycloset.html#18>`_ +to see how a file may be referenced using its chrome URL. + +Absolute Paths +^^^^^^^^^^^^^^ +The source tree location may also be an absolute path (taken from the top of the source tree). +One such example can be found in `toolkit/components/pictureinpicture/jar.mn <https://searchfox.org/mozilla-central/rev/2005e8d87ee045f19dac58e5bff32eff7d01bc9b/toolkit/components/pictureinpicture/jar.mn>`_:: + + toolkit.jar: + * content/global/pictureinpicture/player.xhtml (content/player.xhtml) + content/global/pictureinpicture/player.js (content/player.js) + +Asterisk Marker (Preprocessing) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +An asterisk marker (``*``) at the beginning of the line indicates that the file should be processed by the :ref:`preprocessor` before being packaged. +The file `toolkit/profile/jar.mn <https://searchfox.org/mozilla-central/rev/5b2d2863bd315f232a3f769f76e0eb16cdca7cb0/toolkit/profile/jar.mn>`_ indicates that the file `toolkit/profile/content/profileDowngrade.xhtml <https://searchfox.org/mozilla-central/rev/2005e8d87ee045f19dac58e5bff32eff7d01bc9b/toolkit/profile/content/profileDowngrade.xhtml#34,36>`_ should be +run through the preprocessor, since it contains ``#ifdef`` and ``#endif`` statements that need to be interpreted:: + + * content/mozapps/profile/profileDowngrade.xhtml (content/profileDowngrade.xhtml) + +Base Path, Variables, Wildcards and Localized Files +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +The ``.jar`` file location may be preceded with a base path between square brackets. +The file `toolkit/locales/jar.mn <https://searchfox.org/mozilla-central/rev/5b2d2863bd315f232a3f769f76e0eb16cdca7cb0/toolkit/locales/jar.mn>`_ uses a base path so that the ``.jar`` file is under a ``localization`` directory, +which is a `special directory parsed by mozbuild <https://searchfox.org/mozilla-central/rev/2005e8d87ee045f19dac58e5bff32eff7d01bc9b/python/mozbuild/mozpack/packager/l10n.py#260-265>`_. + +It is also named according to the value passed by the variable ``@AB_CD@``, normally a locale. Note the use of the preprocessor directive ``#filter substitution`` at the top of the file for replacing the variable with the value:: + + #filter substitution + + ... + + [localization] @AB_CD@.jar: + crashreporter (%crashreporter/**/*.ftl) + toolkit (%toolkit/**/*.ftl) + +The percentage sign in front of the source paths designates the locale to target as a source. By default, this is ``en-US``. With this specific example, `/toolkit/locales/en-US <https://searchfox.org/mozilla-central/source/toolkit/locales/en-US>`_ would be targeted. +Otherwise, the file from an alternate localization source tree ``/l10n/<locale>/toolkit/`` is read if building a localized version. +The wildcards in ``**/*.ftl`` tell the processor to install all Fluent files within the ``crashreporter`` and ``toolkit`` directories, as well as their subdirectories. + +Registering Chrome +================== + +:ref:`Chrome Registration <Chrome Registration>` instructions are marked with a percent sign (``%``) at the beginning of the +line, and must be part of the definition of a JAR file. Any additional percents +signs are replaced with an appropriate relative URL of the JAR file being +packaged. + +There are two possible locations for a manifest file. If the chrome is being +built into a standalone application, the ``jar.mn`` processor creates a +``<jarfilename>.manifest`` next to the JAR file itself. This is the default +behavior. + +If the ``moz.build`` specifies ``USE_EXTENSION_MANIFEST = 1``, the ``jar.mn`` processor +creates a single ``chrome.manifest`` file suitable for registering chrome as +an extension. + +Example +^^^^^^^ + +The file `browser/themes/addons/jar.mn <https://searchfox.org/mozilla-central/rev/5b2d2863bd315f232a3f769f76e0eb16cdca7cb0/browser/themes/addons/jar.mn>`_ registers a ``resource`` chrome package under the name ``builtin-themes``. Its source files are in ``%content/builtin-themes/``:: + + browser.jar: + % resource builtin-themes %content/builtin-themes/ + + content/builtin-themes/alpenglow (alpenglow/*.svg) + content/builtin-themes/alpenglow/manifest.json (alpenglow/manifest.json) + +Notice how other files declare an installation destination using the ``builtin-themes`` resource that is defined. As such, a SVG file ``preview.svg`` for a theme ``Alpenglow`` may be loaded using the resource URL ``resource://builtin-themes/alpenglow/preview.svg`` +so that a preview of the theme is available on ``about:addons``. See :ref:`Chrome Registration <Chrome Registration>` for more details on ``resource`` and other manifest instructions. |