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-.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
-
-Efficiently Fetching Source Files During a Build
-************************************************
-
-The OpenEmbedded build system works with source files located through
-the :term:`SRC_URI` variable. When
-you build something using BitBake, a big part of the operation is
-locating and downloading all of the source code. For images,
-downloading all the source for various packages can take a significant
-amount of time.
-
-This section shows you how you can use mirrors to speed up fetching
-source files and how you can pre-fetch files all of which leads to more
-efficient use of resources and time.
-
-Setting up Effective Mirrors
-============================
-
-A good deal that goes into a Yocto Project build is simply downloading
-source code. Maybe you have been working with another
-build system for which you have built up a
-sizable directory of source tarballs. Or, perhaps someone else has such
-a directory for which you have read access. If so, you can save time by
-adding statements to your configuration file so that the build process
-checks local directories first for existing tarballs before checking the
-Internet.
-
-Here is an efficient way to set it up in your ``local.conf`` file::
-
-   SOURCE_MIRROR_URL ?= "file:///home/you/your-download-dir/"
-   INHERIT += "own-mirrors"
-   BB_GENERATE_MIRROR_TARBALLS = "1"
-   # BB_NO_NETWORK = "1"
-
-In the previous example, the
-:term:`BB_GENERATE_MIRROR_TARBALLS`
-variable causes the OpenEmbedded build system to generate tarballs of
-the Git repositories and store them in the
-:term:`DL_DIR` directory. Due to
-performance reasons, generating and storing these tarballs is not the
-build system's default behavior.
-
-You can also use the
-:term:`PREMIRRORS` variable. For
-an example, see the variable's glossary entry in the Yocto Project
-Reference Manual.
-
-Getting Source Files and Suppressing the Build
-==============================================
-
-Another technique you can use to ready yourself for a successive string
-of build operations, is to pre-fetch all the source files without
-actually starting a build. This technique lets you work through any
-download issues and ultimately gathers all the source files into your
-download directory :ref:`structure-build-downloads`,
-which is located with :term:`DL_DIR`.
-
-Use the following BitBake command form to fetch all the necessary
-sources without starting the build::
-
-   $ bitbake target --runall=fetch
-
-This
-variation of the BitBake command guarantees that you have all the
-sources for that BitBake target should you disconnect from the Internet
-and want to do the build later offline.
-