path: root/documentation/ref-manual/ref-tasks.xml

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<chapter id='ref-tasks'>
<title>Tasks</title>

<para>
    Tasks are units of execution for BitBake.
    Recipes (<filename>.bb</filename> files) use tasks to complete
    configuring, compiling, and packaging software.
    This chapter provides a reference of the tasks defined in the
    OpenEmbedded build system.
</para>

<section id='normal-recipe-build-tasks'>
    <title>Normal Recipe Build Tasks</title>

    <para>
        The following sections describe normal tasks associated with building
        a recipe.
    </para>

    <section id='ref-tasks-build'>
        <title><filename>do_build</filename></title>

        <para>
            Default task for a recipe - depends on all other normal tasks
            required to 'build' a recipe.
        </para>
    </section>

    <section id='ref-tasks-compile'>
        <title><filename>do_compile</filename></title>

        <para>
            Compiles the source in the compilation directory.
        </para>
    </section>

    <section id='ref-tasks-compile_ptest_base'>
        <title><filename>do_compile_ptest_base</filename></title>

        <para>
            Compiles the runtime test suite included in the software being
            built.
        </para>
    </section>

    <section id='ref-tasks-configure'>
        <title><filename>do_configure</filename></title>

        <para>
            Configures the source by enabling and disabling any build-time and
            configuration options for the software being built.
        </para>
    </section>

    <section id='ref-tasks-configure_ptest_base'>
        <title><filename>do_configure_ptest_base</filename></title>

        <para>
            Configures the runtime test suite included in the software being
            built.
        </para>
    </section>

    <section id='ref-tasks-deploy'>
        <title><filename>do_deploy</filename></title>

        <para>
            Writes deployable output files to the deploy directory.
        </para>
    </section>

    <section id='ref-tasks-fetch'>
        <title><filename>do_fetch</filename></title>

        <para>
            Fetches the source code.
        </para>
    </section>

    <section id='ref-tasks-install'>
        <title><filename>do_install</filename></title>

        <para>
            Copies files from the compilation directory to a holding area.
        </para>
    </section>

    <section id='ref-tasks-install_ptest_base'>
        <title><filename>do_install_ptest_base</filename></title>

        <para>
            Copies the runtime test suite files from the compilation directory
            to a holding area.
        </para>
    </section>

    <section id='ref-tasks-package'>
        <title><filename>do_package</filename></title>

        <para>
            Analyzes the content of the holding area and splits it into subsets
            based on available packages and files.
        </para>
    </section>

    <section id='ref-tasks-package_index'>
        <title><filename>do_package_index</filename></title>

        <para>
            Creates or updates the index in the Package Feed area.
        </para>
    </section>

    <section id='ref-tasks-package_write_deb'>
        <title><filename>do_package_write_deb</filename></title>

        <para>
            Creates the actual DEB packages and places them in the Package Feed
            area.
        </para>
    </section>

    <section id='ref-tasks-package_write_ipk'>
        <title><filename>do_package_write_ipk</filename></title>

        <para>
            Creates the actual IPK packages and places them in the Package Feed
            area.
        </para>
    </section>

    <section id='ref-tasks-package_write_rpm'>
        <title><filename>do_package_write_rpm</filename></title>

        <para>
            Creates the actual RPM packages and places them in the Package Feed
            area.
        </para>
    </section>

    <section id='ref-tasks-package_write_tar'>
        <title><filename>do_package_write_tar</filename></title>

        <para>
            Creates tar archives for packages and places them in the Package
            Feed area.
        </para>
    </section>

    <section id='ref-tasks-packagedata'>
        <title><filename>do_packagedata</filename></title>

        <para>
            Creates package metadata used by the build system to generate the
            final packages.
        </para>
    </section>

    <section id='ref-tasks-patch'>
        <title><filename>do_patch</filename></title>

        <para>
            Locates patch files and applies them to the source code.
        </para>
    </section>

    <section id='ref-tasks-populate_lic'>
        <title><filename>do_populate_lic</filename></title>

        <para>
            Writes license information for the recipe that is collected later
            when the image is constructed.
        </para>
    </section>

    <section id='ref-tasks-populate_sdk'>
        <title><filename>do_populate_sdk</filename></title>

        <para>
            Creates the file and directory structure for an installable SDK.
        </para>
    </section>

    <section id='ref-tasks-populate_sysroot'>
        <title><filename>do_populate_sysroot</filename></title>

        <para>
            Copies a subset of files installed by the
            <link linkend='ref-tasks-install'><filename>do_install</filename></link>
            task into the sysroot in order to make them available to other
            recipes.
        </para>
    </section>

    <section id='ref-tasks-rm_work'>
        <title><filename>do_rm_work</filename></title>

        <para>
            Removes work files after the build system has finished with them.
        </para>
    </section>

    <section id='ref-tasks-rm_work_all'>
        <title><filename>do_rm_work_all</filename></title>

        <para>
            Top-level task for removing work files after the build system has
            finished with them.
        </para>
    </section>

    <section id='ref-tasks-unpack'>
        <title><filename>do_unpack</filename></title>

        <para>
            Unpacks the source code into a working directory.
        </para>
    </section>
</section>

<section id='manually-called-tasks'>
    <title>Manually Called Tasks</title>

    <para>
        These tasks are typically manually triggered (e.g. by using the
        <filename>bitbake -c</filename> command line option):
    </para>

    <section id='ref-tasks-checkuri'>
        <title><filename>do_checkuri</filename></title>

        <para>
            Validates the SRC_URI value.
        </para>
    </section>

    <section id='ref-tasks-checkuriall'>
        <title><filename>do_checkuriall</filename></title>

        <para>
            Validates the SRC_URI value for all recipes required to build a
            target.
        </para>
    </section>

    <section id='ref-tasks-clean'>
        <title><filename>do_clean</filename></title>

        <para>
            Removes all output files for a target.
        </para>
    </section>

    <section id='ref-tasks-cleanall'>
        <title><filename>do_cleanall</filename></title>

        <para>
            Removes all output files, shared state cache, and downloaded source
            files for a target.
        </para>
    </section>

    <section id='ref-tasks-cleansstate'>
        <title><filename>do_cleansstate</filename></title>

        <para>
            Removes all output files and shared state cache for a target.
        </para>
    </section>

    <section id='ref-tasks-fetchall'>
        <title><filename>do_fetchall</filename></title>

        <para>
            Fetches all remote sources required to build a target.
        </para>
    </section>

    <section id='ref-tasks-devshell'>
        <title><filename>do_devshell</filename></title>

        <para>
            Starts a shell with the environment set up for
            development/debugging.
        </para>
    </section>

    <section id='ref-tasks-listtasks'>
        <title><filename>do_listtasks</filename></title>

        <para>
            Lists all defined tasks for a target.
        </para>
    </section>
</section>

<section id='image-related-tasks'>
    <title>Image-Related Tasks</title>

    <para>
        The following tasks are applicable to image recipes.
    </para>

    <section id='ref-tasks-bootimg'>
        <title><filename>do_bootimg</filename></title>

        <para>
            Creates a bootable live image.
        </para>
    </section>

    <section id='ref-tasks-bundle_initramfs'>
        <title><filename>do_bundle_initramfs</filename></title>

        <para>
            Combines an initial ramdisk image and kernel together to form
            a single image.
        </para>
    </section>

    <section id='ref-tasks-rootfs'>
        <title><filename>do_rootfs</filename></title>

        <para>
            Creates the root filesystem (file and directory structure) for an
            image.
        </para>
    </section>

    <section id='ref-tasks-testimage'>
        <title><filename>do_testimage</filename></title>

        <para>
            Boots an image and performs runtime tests within the image.
        </para>
    </section>

    <section id='ref-tasks-testimage_auto'>
        <title><filename>do_testimage_auto</filename></title>

        <para>
            Boots an image and performs runtime tests within the image
            immediately after it has been built.
        </para>
    </section>

    <section id='ref-tasks-vmdkimg'>
        <title><filename>do_vmdkimg</filename></title>

        <para>
            Creates a .vmdk image for use with VMware and compatible virtual
            machine hosts.
        </para>
    </section>
</section>

<section id='kernel-related-tasks'>
    <title>Kernel-Related Tasks</title>

    <para>
        The following tasks are applicable to kernel recipes.
        Some of them (e.g. the
        <link linkend='ref-tasks-menuconfig'><filename>do_menuconfig</filename></link>
        task) are also applicable to recipes that use
        Linux kernel style configuration (e.g. BusyBox).
    </para>

    <section id='ref-tasks-compile_kernelmodules'>
        <title><filename>do_compile_kernelmodules</filename></title>

        <para>
            Compiles loadable modules for the Linux kernel.
        </para>
    </section>

    <section id='ref-tasks-diffconfig'>
        <title><filename>do_diffconfig</filename></title>

        <para>
            Compares the old and new config files after running the
            <link linkend='ref-tasks-menuconfig'><filename>do_menuconfig</filename></link>
            task for the kernel.
        </para>
    </section>

    <section id='ref-tasks-kernel_checkout'>
        <title><filename>do_kernel_checkout</filename></title>

        <para>
            Checks out source/meta branches for a linux-yocto style kernel.
        </para>
    </section>

    <section id='ref-tasks-kernel_configcheck'>
        <title><filename>do_kernel_configcheck</filename></title>

        <para>
            Validates the kernel configuration for a linux-yocto style kernel.
        </para>
    </section>

    <section id='ref-tasks-kernel_configme'>
        <title><filename>do_kernel_configme</filename></title>

        <para>
            Assembles the kernel configuration for a linux-yocto style kernel.
        </para>
    </section>

    <section id='ref-tasks-kernel_link_vmlinux'>
        <title><filename>do_kernel_link_vmlinux</filename></title>

        <para>
            Creates a symbolic link in arch/$arch/boot for vmlinux kernel
            images.
        </para>
    </section>

    <section id='ref-tasks-menuconfig'>
        <title><filename>do_menuconfig</filename></title>

        <para>
            Runs 'make menuconfig' for the kernel.
        </para>
    </section>

    <section id='ref-tasks-savedefconfig'>
        <title><filename>do_savedefconfig</filename></title>

        <para>
            Creates a minimal Linux kernel configuration file.
        </para>
    </section>

    <section id='ref-tasks-sizecheck'>
        <title><filename>do_sizecheck</filename></title>

        <para>
            Checks the size of the kernel image against KERNEL_IMAGE_MAXSIZE
            (if set).
        </para>
    </section>

    <section id='ref-tasks-strip'>
        <title><filename>do_strip</filename></title>

        <para>
            Strips unneeded sections out of the Linux kernel image.
        </para>
    </section>

    <section id='ref-tasks-uboot_mkimage'>
        <title><filename>do_uboot_mkimage</filename></title>

        <para>
            Creates a uImage file from the kernel for the U-Boot bootloader.
        </para>
    </section>

    <section id='ref-tasks-validate_branches'>
        <title><filename>do_validate_branches</filename></title>

        <para>
            Ensures that the source/meta branches are on the locations
            specified by their SRCREV values for a linux-yocto style kernel.
        </para>
    </section>
</section>

<section id='miscellaneous-tasks'>
    <title>Miscellaneous Tasks</title>

    <para>
        The following sections describe miscellaneous tasks.
    </para>

    <section id='ref-tasks-generate_qt_config_file'>
        <title><filename>do_generate_qt_config_file</filename></title>

        <para>
            Writes a qt.conf file for building a Qt-based application.
        </para>
    </section>

    <section id='ref-tasks-spdx'>
        <title><filename>do_spdx</filename></title>

        <para>
            A build stage that takes the source code and scans it on a remote
            FOSSOLOGY server in order to produce an SPDX document.
        </para>
    </section>
</section>

</chapter>
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