dev-manual, ref-manual: Moved build history info to dev-manual

Fixes [YOCTO #12370]

The section in the ref-manual on build history has been moved to
the dev-manual.  It is more of a "how-to" piece of information than
a reference.

(From yocto-docs rev: 9634bd8dc51e2972e6a5f3a3d3b4256c8ca8749c)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

9 files changed, 576 insertions, 515 deletions

diff --git a/documentation/Makefile b/documentation/Makefile
index c08d912302..5e166a2ba0 100644
--- a/documentation/Makefile
+++ b/documentation/Makefile
@@ -146,8 +146,8 @@ TARFILES = dev-style.css dev-manual.html \
            figures/source-repos.png figures/yp-download.png \
            figures/wip.png
         else
-TARFILES = dev-style.css dev-manual.html \
-           figures/dev-title.png \
+TARFILES = dev-style.css dev-manual.html figures/buildhistory-web.png \
+           figures/dev-title.png figures/buildhistory.png \
            figures/recipe-workflow.png figures/bitbake-build-flow.png \
            eclipse
         endif
@@ -281,7 +281,6 @@ ifeq ($(DOC),ref-manual)
 XSLTOPTS = --xinclude
 ALLPREQ = html eclipse tarball
 TARFILES = ref-manual.html ref-style.css figures/poky-title.png \
-        figures/buildhistory.png figures/buildhistory-web.png \
         figures/build-workspace-directory.png \
         eclipse
 MANUALS = $(DOC)/$(DOC).html $(DOC)/eclipse
diff --git a/documentation/dev-manual/dev-manual-common-tasks.xml b/documentation/dev-manual/dev-manual-common-tasks.xml
index 13a84b9c22..0c2101fde9 100644
--- a/documentation/dev-manual/dev-manual-common-tasks.xml
+++ b/documentation/dev-manual/dev-manual-common-tasks.xml
@@ -7432,8 +7432,8 @@ Some notes from Cal:
      BUILDHISTORY_COMMIT = "1"
                     </literallayout>
                     For information on build history, see the
-                    "<ulink url='&YOCTO_DOCS_REF_URL;#maintaining-build-output-quality'>Maintaining Build Output Quality</ulink>"
-                    section in the Yocto Project Reference Manual.
+                    "<link linkend='maintaining-build-output-quality'>Maintaining Build Output Quality</link>"
+                    section.
                 </para>
 
                 <note>
@@ -9089,6 +9089,566 @@ Some notes from Cal:
         </section>
     </section>
 
+
+
+
+    <section id='maintaining-build-output-quality'>
+        <title>Maintaining Build Output Quality</title>
+
+        <para>
+            Many factors can influence the quality of a build.
+            For example, if you upgrade a recipe to use a new version of an
+            upstream software package or you experiment with some new
+            configuration options, subtle changes can occur that you might
+            not detect until later.
+            Consider the case where your recipe is using a newer version of
+            an upstream package.
+            In this case, a new version of a piece of software might
+            introduce an optional dependency on another library, which is
+            auto-detected.
+            If that library has already been built when the software is
+            building, the software will link to the built library and that
+            library will be pulled into your image along with the new
+            software even if you did not want the library.
+        </para>
+
+        <para>
+            The
+            <ulink url='&YOCTO_DOCS_REF_URL;#ref-classes-buildhistory'><filename>buildhistory</filename></ulink>
+            class exists to help you maintain the quality of your build
+            output.
+            You can use the class to highlight unexpected and possibly
+            unwanted changes in the build output.
+            When you enable build history, it records information about the
+            contents of each package and image and then commits that
+            information to a local Git repository where you can examine
+            the information.
+        </para>
+
+        <para>
+            The remainder of this section describes the following:
+            <itemizedlist>
+               <listitem><para>
+                   How you can enable and disable build history
+                   </para></listitem>
+               <listitem><para>
+                   How to understand what the build history contains
+                   </para></listitem>
+               <listitem><para>
+                   How to limit the information used for build history
+                   </para></listitem>
+               <listitem><para>
+                   How to examine the build history from both a
+                   command-line and web interface
+                   </para></listitem>
+           </itemizedlist>
+        </para>
+
+        <section id='enabling-and-disabling-build-history'>
+            <title>Enabling and Disabling Build History</title>
+
+            <para>
+                Build history is disabled by default.
+                To enable it, add the following <filename>INHERIT</filename>
+                statement and set the
+                <ulink url='&YOCTO_DOCS_REF_URL;#var-BUILDHISTORY_COMMIT'><filename>BUILDHISTORY_COMMIT</filename></ulink>
+                variable to "1" at the end of your
+                <filename>conf/local.conf</filename> file found in the
+                <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>:
+                <literallayout class='monospaced'>
+     INHERIT += "buildhistory"
+     BUILDHISTORY_COMMIT = "1"
+                </literallayout>
+                Enabling build history as previously described causes the
+                OpenEmbedded build system to collect build output information
+                and commit it as a single commit to a local
+                <ulink url='&YOCTO_DOCS_OVERVIEW_URL;#git'>Git</ulink>
+                repository.
+                <note>
+                    Enabling build history increases your build times slightly,
+                    particularly for images, and increases the amount of disk
+                    space used during the build.
+                </note>
+            </para>
+
+            <para>
+                You can disable build history by removing the previous
+                statements from your <filename>conf/local.conf</filename>
+                file.
+            </para>
+        </section>
+
+        <section id='understanding-what-the-build-history-contains'>
+            <title>Understanding What the Build History Contains</title>
+
+            <para>
+                Build history information is kept in
+                <filename>${</filename><ulink url='&YOCTO_DOCS_REF_URL;#var-TOPDIR'><filename>TOPDIR</filename></ulink><filename>}/buildhistory</filename>
+                in the Build Directory as defined by the
+                <ulink url='&YOCTO_DOCS_REF_URL;#var-BUILDHISTORY_DIR'><filename>BUILDHISTORY_DIR</filename></ulink>
+                variable.
+                The following is an example abbreviated listing:
+                <imagedata fileref="figures/buildhistory.png" align="center" width="6in" depth="4in" />
+            </para>
+
+            <para>
+                At the top level, a <filename>metadata-revs</filename>
+                file exists that lists the revisions of the repositories for
+                the enabled layers when the build was produced.
+                The rest of the data splits into separate
+                <filename>packages</filename>, <filename>images</filename>
+                and <filename>sdk</filename> directories, the contents of
+                which are described as follows.
+            </para>
+
+            <section id='build-history-package-information'>
+                <title>Build History Package Information</title>
+
+                <para>
+                    The history for each package contains a text file that has
+                    name-value pairs with information about the package.
+                    For example,
+                    <filename>buildhistory/packages/i586-poky-linux/busybox/busybox/latest</filename>
+                    contains the following:
+                    <literallayout class='monospaced'>
+     PV = 1.22.1
+     PR = r32
+     RPROVIDES =
+     RDEPENDS = glibc (>= 2.20) update-alternatives-opkg
+     RRECOMMENDS = busybox-syslog busybox-udhcpc update-rc.d
+     PKGSIZE = 540168
+     FILES = /usr/bin/* /usr/sbin/* /usr/lib/busybox/* /usr/lib/lib*.so.* \
+        /etc /com /var /bin/* /sbin/* /lib/*.so.* /lib/udev/rules.d \
+        /usr/lib/udev/rules.d /usr/share/busybox /usr/lib/busybox/* \
+        /usr/share/pixmaps /usr/share/applications /usr/share/idl \
+        /usr/share/omf /usr/share/sounds /usr/lib/bonobo/servers
+     FILELIST = /bin/busybox /bin/busybox.nosuid /bin/busybox.suid /bin/sh \
+        /etc/busybox.links.nosuid /etc/busybox.links.suid
+                    </literallayout>
+                    Most of these name-value pairs correspond to variables
+                    used to produce the package.
+                    The exceptions are <filename>FILELIST</filename>, which
+                    is the actual list of files in the package, and
+                    <filename>PKGSIZE</filename>, which is the total size of
+                    files in the package in bytes.
+                </para>
+
+                <para>
+                    A file also exists that corresponds to the recipe from
+                    which the package came (e.g.
+                    <filename>buildhistory/packages/i586-poky-linux/busybox/latest</filename>):
+                    <literallayout class='monospaced'>
+     PV = 1.22.1
+     PR = r32
+     DEPENDS = initscripts kern-tools-native update-rc.d-native \
+        virtual/i586-poky-linux-compilerlibs virtual/i586-poky-linux-gcc \
+        virtual/libc virtual/update-alternatives
+     PACKAGES = busybox-ptest busybox-httpd busybox-udhcpd busybox-udhcpc \
+        busybox-syslog busybox-mdev busybox-hwclock busybox-dbg \
+        busybox-staticdev busybox-dev busybox-doc busybox-locale busybox
+                    </literallayout>
+                </para>
+
+                <para>
+                    Finally, for those recipes fetched from a version control
+                    system (e.g., Git), a file exists that lists source
+                    revisions that are specified in the recipe and lists
+                    the actual revisions used during the build.
+                    Listed and actual revisions might differ when
+                    <ulink url='&YOCTO_DOCS_REF_URL;#var-SRCREV'><filename>SRCREV</filename></ulink>
+                    is set to
+                    ${<ulink url='&YOCTO_DOCS_REF_URL;#var-AUTOREV'><filename>AUTOREV</filename></ulink>}.
+                    Here is an example assuming
+                    <filename>buildhistory/packages/qemux86-poky-linux/linux-yocto/latest_srcrev</filename>):
+                    <literallayout class='monospaced'>
+     # SRCREV_machine = "38cd560d5022ed2dbd1ab0dca9642e47c98a0aa1"
+     SRCREV_machine = "38cd560d5022ed2dbd1ab0dca9642e47c98a0aa1"
+     # SRCREV_meta = "a227f20eff056e511d504b2e490f3774ab260d6f"
+     SRCREV_meta = "a227f20eff056e511d504b2e490f3774ab260d6f"
+                    </literallayout>
+                    You can use the
+                    <filename>buildhistory-collect-srcrevs</filename>
+                    command with the <filename>-a</filename> option to
+                    collect the stored <filename>SRCREV</filename> values
+                    from build history and report them in a format suitable for
+                    use in global configuration (e.g.,
+                    <filename>local.conf</filename> or a distro include file)
+                    to override floating <filename>AUTOREV</filename> values
+                    to a fixed set of revisions.
+                    Here is some example output from this command:
+                    <literallayout class='monospaced'>
+     $ buildhistory-collect-srcrevs -a
+     # i586-poky-linux
+     SRCREV_pn-glibc = "b8079dd0d360648e4e8de48656c5c38972621072"
+     SRCREV_pn-glibc-initial = "b8079dd0d360648e4e8de48656c5c38972621072"
+     SRCREV_pn-opkg-utils = "53274f087565fd45d8452c5367997ba6a682a37a"
+     SRCREV_pn-kmod = "fd56638aed3fe147015bfa10ed4a5f7491303cb4"
+     # x86_64-linux
+     SRCREV_pn-gtk-doc-stub-native = "1dea266593edb766d6d898c79451ef193eb17cfa"
+     SRCREV_pn-dtc-native = "65cc4d2748a2c2e6f27f1cf39e07a5dbabd80ebf"
+     SRCREV_pn-update-rc.d-native = "eca680ddf28d024954895f59a241a622dd575c11"
+     SRCREV_glibc_pn-cross-localedef-native = "b8079dd0d360648e4e8de48656c5c38972621072"
+     SRCREV_localedef_pn-cross-localedef-native = "c833367348d39dad7ba018990bfdaffaec8e9ed3"
+     SRCREV_pn-prelink-native = "faa069deec99bf61418d0bab831c83d7c1b797ca"
+     SRCREV_pn-opkg-utils-native = "53274f087565fd45d8452c5367997ba6a682a37a"
+     SRCREV_pn-kern-tools-native = "23345b8846fe4bd167efdf1bd8a1224b2ba9a5ff"
+     SRCREV_pn-kmod-native = "fd56638aed3fe147015bfa10ed4a5f7491303cb4"
+     # qemux86-poky-linux
+     SRCREV_machine_pn-linux-yocto = "38cd560d5022ed2dbd1ab0dca9642e47c98a0aa1"
+     SRCREV_meta_pn-linux-yocto = "a227f20eff056e511d504b2e490f3774ab260d6f"
+     # all-poky-linux
+     SRCREV_pn-update-rc.d = "eca680ddf28d024954895f59a241a622dd575c11"
+                    </literallayout>
+                    <note>
+                        Here are some notes on using the
+                        <filename>buildhistory-collect-srcrevs</filename>
+                        command:
+                        <itemizedlist>
+                            <listitem><para>
+                                By default, only values where the
+                                <filename>SRCREV</filename> was not hardcoded
+                                (usually when <filename>AUTOREV</filename>
+                                is used) are reported.
+                                Use the <filename>-a</filename> option to
+                                see all <filename>SRCREV</filename> values.
+                                </para></listitem>
+                            <listitem><para>
+                                The output statements might not have any effect
+                                if overrides are applied elsewhere in the
+                                build system configuration.
+                                Use the <filename>-f</filename> option to add
+                                the <filename>forcevariable</filename> override
+                                to each output line if you need to work around
+                                this restriction.
+                                </para></listitem>
+                            <listitem><para>
+                                The script does apply special handling when
+                                building for multiple machines.
+                                However, the script does place a comment before
+                                each set of values that specifies which
+                                triplet to which they belong as previously
+                                shown (e.g.,
+                                <filename>i586-poky-linux</filename>).
+                                </para></listitem>
+                        </itemizedlist>
+                    </note>
+                </para>
+            </section>
+
+            <section id='build-history-image-information'>
+                <title>Build History Image Information</title>
+
+                <para>
+                    The files produced for each image are as follows:
+                    <itemizedlist>
+                        <listitem><para>
+                            <filename>image-files:</filename>
+                            A directory containing selected files from the root
+                            filesystem.
+                            The files are defined by
+                            <ulink url='&YOCTO_DOCS_REF_URL;#var-BUILDHISTORY_IMAGE_FILES'><filename>BUILDHISTORY_IMAGE_FILES</filename></ulink>.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>build-id.txt:</filename>
+                            Human-readable information about the build
+                            configuration and metadata source revisions.
+                            This file contains the full build header as printed
+                            by BitBake.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>*.dot:</filename>
+                            Dependency graphs for the image that are
+                            compatible with <filename>graphviz</filename>.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>files-in-image.txt:</filename>
+                                A list of files in the image with permissions,
+                            owner, group, size, and symlink information.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>image-info.txt:</filename>
+                            A text file containing name-value pairs with
+                            information about the image.
+                            See the following listing example for more
+                            information.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>installed-package-names.txt:</filename>
+                            A list of installed packages by name only.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>installed-package-sizes.txt:</filename>
+                            A list of installed packages ordered by size.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>installed-packages.txt:</filename>
+                            A list of installed packages with full package
+                            filenames.
+                            </para></listitem>
+                    </itemizedlist>
+                    <note>
+                        Installed package information is able to be gathered
+                        and produced even if package management is disabled
+                        for the final image.
+                    </note>
+                </para>
+
+                <para>
+                    Here is an example of <filename>image-info.txt</filename>:
+                    <literallayout class='monospaced'>
+     DISTRO = poky
+     DISTRO_VERSION = 1.7
+     USER_CLASSES = buildstats image-mklibs image-prelink
+     IMAGE_CLASSES = image_types
+     IMAGE_FEATURES = debug-tweaks
+     IMAGE_LINGUAS =
+     IMAGE_INSTALL = packagegroup-core-boot run-postinsts
+     BAD_RECOMMENDATIONS =
+     NO_RECOMMENDATIONS =
+     PACKAGE_EXCLUDE =
+     ROOTFS_POSTPROCESS_COMMAND = write_package_manifest; license_create_manifest; \
+        write_image_manifest ; buildhistory_list_installed_image ; \
+        buildhistory_get_image_installed ; ssh_allow_empty_password;  \
+        postinst_enable_logging; rootfs_update_timestamp ; ssh_disable_dns_lookup ;
+     IMAGE_POSTPROCESS_COMMAND =   buildhistory_get_imageinfo ;
+     IMAGESIZE = 6900
+                    </literallayout>
+                    Other than <filename>IMAGESIZE</filename>, which is the
+                    total size of the files in the image in Kbytes, the
+                    name-value pairs are variables that may have influenced the
+                    content of the image.
+                    This information is often useful when you are trying to
+                    determine why a change in the package or file
+                    listings has occurred.
+                </para>
+            </section>
+
+            <section id='using-build-history-to-gather-image-information-only'>
+                <title>Using Build History to Gather Image Information Only</title>
+
+                <para>
+                    As you can see, build history produces image information,
+                    including dependency graphs, so you can see why something
+                    was pulled into the image.
+                    If you are just interested in this information and not
+                    interested in collecting specific package or SDK
+                    information, you can enable writing only image information
+                    without any history by adding the following to your
+                    <filename>conf/local.conf</filename> file found in the
+                    <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>:
+                    <literallayout class='monospaced'>
+     INHERIT += "buildhistory"
+     BUILDHISTORY_COMMIT = "0"
+     BUILDHISTORY_FEATURES = "image"
+                    </literallayout>
+                    Here, you set the
+                    <ulink url='&YOCTO_DOCS_REF_URL;#var-BUILDHISTORY_FEATURES'><filename>BUILDHISTORY_FEATURES</filename></ulink>
+                    variable to use the image feature only.
+                </para>
+            </section>
+
+            <section id='build-history-sdk-information'>
+                <title>Build History SDK Information</title>
+
+                <para>
+                    Build history collects similar information on the contents
+                    of SDKs
+                    (e.g. <filename>bitbake -c populate_sdk imagename</filename>)
+                    as compared to information it collects for images.
+                    Furthermore, this information differs depending on whether
+                    an extensible or standard SDK is being produced.
+                </para>
+
+                <para>
+                    The following list shows the files produced for SDKs:
+                    <itemizedlist>
+                        <listitem><para>
+                            <filename>files-in-sdk.txt:</filename>
+                            A list of files in the SDK with permissions,
+                            owner, group, size, and symlink information.
+                            This list includes both the host and target parts
+                            of the SDK.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>sdk-info.txt:</filename>
+                            A text file containing name-value pairs with
+                            information about the SDK.
+                            See the following listing example for more
+                            information.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>sstate-task-sizes.txt:</filename>
+                            A text file containing name-value pairs with
+                            information about task group sizes
+                            (e.g. <filename>do_populate_sysroot</filename>
+                            tasks have a total size).
+                            The <filename>sstate-task-sizes.txt</filename> file
+                            exists only when an extensible SDK is created.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>sstate-package-sizes.txt:</filename>
+                            A text file containing name-value pairs with
+                            information for the shared-state packages and
+                            sizes in the SDK.
+                            The <filename>sstate-package-sizes.txt</filename>
+                            file exists only when an extensible SDK is created.
+                            </para></listitem>
+                        <listitem><para>
+                            <filename>sdk-files:</filename>
+                            A folder that contains copies of the files
+                            mentioned in
+                            <filename>BUILDHISTORY_SDK_FILES</filename> if the
+                            files are present in the output.
+                            Additionally, the default value of
+                            <filename>BUILDHISTORY_SDK_FILES</filename> is
+                            specific to the extensible SDK although you can
+                            set it differently if you would like to pull in
+                            specific files from the standard SDK.</para>
+
+                            <para>The default files are
+                            <filename>conf/local.conf</filename>,
+                            <filename>conf/bblayers.conf</filename>,
+                            <filename>conf/auto.conf</filename>,
+                            <filename>conf/locked-sigs.inc</filename>, and
+                            <filename>conf/devtool.conf</filename>.
+                            Thus, for an extensible SDK, these files get
+                            copied into the <filename>sdk-files</filename>
+                            directory.
+                            </para></listitem>
+                        <listitem><para>
+                            The following information appears under
+                            each of the <filename>host</filename>
+                            and <filename>target</filename> directories
+                            for the portions of the SDK that run on the host
+                            and on the target, respectively:
+                            <note>
+                                The following files for the most part are empty
+                                when producing an extensible SDK because this
+                                type of SDK is not constructed from packages
+                                as is the standard SDK.
+                            </note>
+                            <itemizedlist>
+                                <listitem><para>
+                                    <filename>depends.dot:</filename>
+                                    Dependency graph for the SDK that is
+                                    compatible with
+                                    <filename>graphviz</filename>.
+                                    </para></listitem>
+                                <listitem><para>
+                                    <filename>installed-package-names.txt:</filename>
+                                    A list of installed packages by name only.
+                                    </para></listitem>
+                                <listitem><para>
+                                    <filename>installed-package-sizes.txt:</filename>
+                                    A list of installed packages ordered by size.
+                                    </para></listitem>
+                                <listitem><para>
+                                    <filename>installed-packages.txt:</filename>
+                                    A list of installed packages with full
+                                    package filenames.
+                                    </para></listitem>
+                                </itemizedlist>
+                            </para></listitem>
+                    </itemizedlist>
+                </para>
+
+                <para>
+                    Here is an example of <filename>sdk-info.txt</filename>:
+                    <literallayout class='monospaced'>
+     DISTRO = poky
+     DISTRO_VERSION = 1.3+snapshot-20130327
+     SDK_NAME = poky-glibc-i686-arm
+     SDK_VERSION = 1.3+snapshot
+     SDKMACHINE =
+     SDKIMAGE_FEATURES = dev-pkgs dbg-pkgs
+     BAD_RECOMMENDATIONS =
+     SDKSIZE = 352712
+                    </literallayout>
+                    Other than <filename>SDKSIZE</filename>, which is the
+                    total size of the files in the SDK in Kbytes, the
+                    name-value pairs are variables that might have influenced
+                    the content of the SDK.
+                    This information is often useful when you are trying to
+                    determine why a change in the package or file listings
+                    has occurred.
+                </para>
+            </section>
+
+            <section id='examining-build-history-information'>
+                <title>Examining Build History Information</title>
+
+                <para>
+                    You can examine build history output from the command
+                    line or from a web interface.
+                </para>
+
+                <para>
+                    To see any changes that have occurred (assuming you have
+                    <ulink url='&YOCTO_DOCS_REF_URL;#var-BUILDHISTORY_COMMIT'><filename>BUILDHISTORY_COMMIT</filename></ulink><filename>&nbsp;= "1"</filename>),
+                    you can simply use any Git command that allows you to
+                    view the history of a repository.
+                    Here is one method:
+                    <literallayout class='monospaced'>
+      $ git log -p
+                    </literallayout>
+                    You need to realize, however, that this method does show
+                    changes that are not significant (e.g. a package's size
+                    changing by a few bytes).
+                </para>
+
+                <para>
+                    A command-line tool called
+                    <filename>buildhistory-diff</filename> does exist, though,
+                    that queries the Git repository and prints just the
+                    differences that might be significant in human-readable
+                    form.
+                    Here is an example:
+                    <literallayout class='monospaced'>
+     $ ~/poky/poky/scripts/buildhistory-diff . HEAD^
+     Changes to images/qemux86_64/glibc/core-image-minimal (files-in-image.txt):
+        /etc/anotherpkg.conf was added
+        /sbin/anotherpkg was added
+        * (installed-package-names.txt):
+        *   anotherpkg was added
+     Changes to images/qemux86_64/glibc/core-image-minimal (installed-package-names.txt):
+        anotherpkg was added
+     packages/qemux86_64-poky-linux/v86d: PACKAGES: added "v86d-extras"
+        * PR changed from "r0" to "r1"
+        * PV changed from "0.1.10" to "0.1.12"
+     packages/qemux86_64-poky-linux/v86d/v86d: PKGSIZE changed from 110579 to 144381 (+30%)
+        * PR changed from "r0" to "r1"
+        * PV changed from "0.1.10" to "0.1.12"
+                    </literallayout>
+                    <note>
+                        The <filename>buildhistory-diff</filename> tool
+                        requires the <filename>GitPython</filename> package.
+                        Be sure to install it using Pip3 as follows:
+                        <literallayout class='monospaced'>
+   $ pip3 install GitPython --user
+                        </literallayout>
+                        Alternatively, you can install
+                        <filename>python3-git</filename> using the appropriate
+                        distribution package manager (e.g.
+                        <filename>apt-get</filename>, <filename>dnf</filename>,
+                        or <filename>zipper</filename>).
+                    </note>
+                </para>
+
+                <para>
+                    To see changes to the build history using a web interface,
+                    follow the instruction in the <filename>README</filename>
+                    file here.
+                    <ulink url='http://git.yoctoproject.org/cgit/cgit.cgi/buildhistory-web/'></ulink>.
+                </para>
+
+                <para>
+                    Here is a sample screenshot of the interface:
+                    <imagedata fileref="figures/buildhistory-web.png" align="center" scalefit="1" width="130%" contentdepth="130%" />
+                </para>
+            </section>
+        </section>
+    </section>
+
     <section id="performing-automated-runtime-testing">
         <title>Performing Automated Runtime Testing</title>
 
diff --git a/documentation/ref-manual/figures/buildhistory-web.png b/documentation/dev-manual/figures/buildhistory-web.png
index f6db86c977..f6db86c977 100644
--- a/documentation/ref-manual/figures/buildhistory-web.png
+++ b/documentation/dev-manual/figures/buildhistory-web.png
diff --git a/documentation/ref-manual/figures/buildhistory.png b/documentation/dev-manual/figures/buildhistory.png
index bd5f8a4908..bd5f8a4908 100644
--- a/documentation/ref-manual/figures/buildhistory.png
+++ b/documentation/dev-manual/figures/buildhistory.png
diff --git a/documentation/ref-manual/migration.xml b/documentation/ref-manual/migration.xml
index 8a6b8a18fc..01c5a982e2 100644
--- a/documentation/ref-manual/migration.xml
+++ b/documentation/ref-manual/migration.xml
@@ -1022,8 +1022,8 @@
                     </para></listitem>
             </itemizedlist>
             For more information on Build History, see the
-            "<link linkend='maintaining-build-output-quality'>Maintaining Build Output Quality</link>"
-            section.
+            "<ulink url='&YOCTO_DOCS_DEV_URL;#maintaining-build-output-quality'>Maintaining Build Output Quality</ulink>"
+            section in the Yocto Project Development Tasks Manual.
         </para>
     </section>
 
@@ -2026,8 +2026,8 @@
                     You should manually remove old "build-id" files from your
                     existing build history repositories to avoid confusion.
                     For information on the build history feature, see the
-                    "<link linkend='maintaining-build-output-quality'>Maintaining Build Output Quality</link>"
-                    section.
+                    "<ulink url='&YOCTO_DOCS_DEV_URL;#maintaining-build-output-quality'>Maintaining Build Output Quality</ulink>"
+                    section in the Yocto Project Development Tasks Manual.
                     </para></listitem>
             </itemizedlist>
         </para>
diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index eabb60fe03..3b7ac31e6a 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -357,8 +357,8 @@
         history of build output metadata, which can be used to detect possible
         regressions as well as used for analysis of the build output.
         For more information on using Build History, see the
-        "<link linkend='maintaining-build-output-quality'>Maintaining Build Output Quality</link>"
-        section.
+        "<ulink url='&YOCTO_DOCS_DEV_URL;#maintaining-build-output-quality'>Maintaining Build Output Quality</ulink>"
+        section in the Yocto Project Development Tasks Manual.
     </para>
 </section>
 
diff --git a/documentation/ref-manual/ref-structure.xml b/documentation/ref-manual/ref-structure.xml
index ad8f24efd7..7a2371d8b3 100644
--- a/documentation/ref-manual/ref-structure.xml
+++ b/documentation/ref-manual/ref-structure.xml
@@ -306,8 +306,8 @@
             The directory tracks build information into image, packages, and
             SDK subdirectories.
             For information on the build history feature, see the
-            "<link linkend='maintaining-build-output-quality'>Maintaining Build Output Quality</link>"
-            section.
+            "<ulink url='&YOCTO_DOCS_DEV_URL;#maintaining-build-output-quality'>Maintaining Build Output Quality</ulink>"
+            section in the Yocto Project Development Tasks Manual.
         </para>
     </section>
 
diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index fa4724984f..c784bd7424 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -1923,8 +1923,8 @@
                     class, this variable specifies the build history features
                     to be enabled.
                     For more information on how build history works, see the
-                    "<link linkend='maintaining-build-output-quality'>Maintaining Build Output Quality</link>"
-                    section.
+                    "<ulink url='&YOCTO_DOCS_DEV_URL;#maintaining-build-output-quality'>Maintaining Build Output Quality</ulink>"
+                    section in the Yocto Project Development Tasks Manual.
                 </para>
 
                 <para>
diff --git a/documentation/ref-manual/usingpoky.xml b/documentation/ref-manual/usingpoky.xml
index e379459a20..e6b71b1565 100644
--- a/documentation/ref-manual/usingpoky.xml
+++ b/documentation/ref-manual/usingpoky.xml
@@ -11,511 +11,13 @@
         documentation set provide more details on how to use the Yocto Project.
     </para>
 
-<section id='maintaining-build-output-quality'>
-    <title>Maintaining Build Output Quality</title>
 
-    <para>
-        Many factors can influence the quality of a build.
-        For example, if you upgrade a recipe to use a new version of an upstream software
-        package or you experiment with some new configuration options, subtle changes
-        can occur that you might not detect until later.
-        Consider the case where your recipe is using a newer version of an upstream package.
-        In this case, a new version of a piece of software might introduce an optional
-        dependency on another library, which is auto-detected.
-        If that library has already been built when the software is building,
-        the software will link to the built library and that library will be pulled
-        into your image along with the new software even if you did not want the
-        library.
-    </para>
-
-    <para>
-        The
-        <link linkend='ref-classes-buildhistory'><filename>buildhistory</filename></link>
-        class exists to help you maintain
-        the quality of your build output.
-        You can use the class to highlight unexpected and possibly unwanted
-        changes in the build output.
-        When you enable build history, it records information about the contents of
-        each package and image and then commits that information to a local Git
-        repository where you can examine the information.
-    </para>
 
-    <para>
-        The remainder of this section describes the following:
-        <itemizedlist>
-           <listitem><para>How you can enable and disable
-               build history</para></listitem>
-           <listitem><para>How to understand what the build history contains
-               </para></listitem>
-           <listitem><para>How to limit the information used for build history
-               </para></listitem>
-           <listitem><para>How to examine the build history from both a
-               command-line and web interface</para></listitem>
-       </itemizedlist>
-    </para>
+OLD START WAS HERE.
 
-    <section id='enabling-and-disabling-build-history'>
-        <title>Enabling and Disabling Build History</title>
 
-        <para>
-            Build history is disabled by default.
-            To enable it, add the following <filename>INHERIT</filename>
-            statement and set the
-            <link linkend='var-BUILDHISTORY_COMMIT'><filename>BUILDHISTORY_COMMIT</filename></link>
-            variable to "1" at the end of your
-            <filename>conf/local.conf</filename> file found in the
-            <link linkend='build-directory'>Build Directory</link>:
-            <literallayout class='monospaced'>
-     INHERIT += "buildhistory"
-     BUILDHISTORY_COMMIT = "1"
-            </literallayout>
-            Enabling build history as previously described causes the
-            OpenEmbedded build system to collect build output information and
-            commit it as a single commit to a local
-            <ulink url='&YOCTO_DOCS_OVERVIEW_URL;#git'>Git</ulink> repository.
-            <note>
-                Enabling build history increases your build times slightly,
-                particularly for images, and increases the amount of disk
-                space used during the build.
-            </note>
-        </para>
+OLD END WAS HERE.
 
-        <para>
-            You can disable build history by removing the previous statements
-            from your <filename>conf/local.conf</filename> file.
-        </para>
-    </section>
-
-    <section id='understanding-what-the-build-history-contains'>
-        <title>Understanding What the Build History Contains</title>
-
-        <para>
-            Build history information is kept in
-            <filename>${</filename><link linkend='var-TOPDIR'><filename>TOPDIR</filename></link><filename>}/buildhistory</filename>
-            in the Build Directory as defined by the
-            <link linkend='var-BUILDHISTORY_DIR'><filename>BUILDHISTORY_DIR</filename></link>
-            variable.
-            The following is an example abbreviated listing:
-            <imagedata fileref="figures/buildhistory.png" align="center" width="6in" depth="4in" />
-        </para>
-
-        <para>
-            At the top level, there is a <filename>metadata-revs</filename> file
-            that lists the revisions of the repositories for the layers enabled
-            when the build was produced.
-            The rest of the data splits into separate
-            <filename>packages</filename>, <filename>images</filename> and
-            <filename>sdk</filename> directories, the contents of which are
-            described below.
-        </para>
-
-        <section id='build-history-package-information'>
-            <title>Build History Package Information</title>
-
-            <para>
-                The history for each package contains a text file that has
-                name-value pairs with information about the package.
-                For example, <filename>buildhistory/packages/i586-poky-linux/busybox/busybox/latest</filename>
-                contains the following:
-                <literallayout class='monospaced'>
-     PV = 1.22.1
-     PR = r32
-     RPROVIDES =
-     RDEPENDS = glibc (>= 2.20) update-alternatives-opkg
-     RRECOMMENDS = busybox-syslog busybox-udhcpc update-rc.d
-     PKGSIZE = 540168
-     FILES = /usr/bin/* /usr/sbin/* /usr/lib/busybox/* /usr/lib/lib*.so.* \
-        /etc /com /var /bin/* /sbin/* /lib/*.so.* /lib/udev/rules.d \
-        /usr/lib/udev/rules.d /usr/share/busybox /usr/lib/busybox/* \
-        /usr/share/pixmaps /usr/share/applications /usr/share/idl \
-        /usr/share/omf /usr/share/sounds /usr/lib/bonobo/servers
-     FILELIST = /bin/busybox /bin/busybox.nosuid /bin/busybox.suid /bin/sh \
-        /etc/busybox.links.nosuid /etc/busybox.links.suid
-                </literallayout>
-                Most of these name-value pairs correspond to variables used
-                to produce the package.
-                The exceptions are <filename>FILELIST</filename>, which is the
-                actual list of files in the package, and
-                <filename>PKGSIZE</filename>, which is the total size of files
-                in the package in bytes.
-            </para>
-
-            <para>
-                There is also a file corresponding to the recipe from which the
-                package came (e.g.
-                <filename>buildhistory/packages/i586-poky-linux/busybox/latest</filename>):
-                <literallayout class='monospaced'>
-     PV = 1.22.1
-     PR = r32
-     DEPENDS = initscripts kern-tools-native update-rc.d-native \
-        virtual/i586-poky-linux-compilerlibs virtual/i586-poky-linux-gcc \
-        virtual/libc virtual/update-alternatives
-     PACKAGES = busybox-ptest busybox-httpd busybox-udhcpd busybox-udhcpc \
-        busybox-syslog busybox-mdev busybox-hwclock busybox-dbg \
-        busybox-staticdev busybox-dev busybox-doc busybox-locale busybox
-                </literallayout>
-            </para>
-
-            <para>
-                Finally, for those recipes fetched from a version control
-                system (e.g., Git), a file exists that lists source revisions
-                that are specified in the recipe and lists the actual revisions
-                used during the build.
-                Listed and actual revisions might differ when
-                <link linkend='var-SRCREV'><filename>SRCREV</filename></link>
-                is set to
-                <filename>${<link linkend='var-AUTOREV'>AUTOREV</link>}</filename>.
-                Here is an example assuming
-                <filename>buildhistory/packages/qemux86-poky-linux/linux-yocto/latest_srcrev</filename>):
-                <literallayout class='monospaced'>
-     # SRCREV_machine = "38cd560d5022ed2dbd1ab0dca9642e47c98a0aa1"
-     SRCREV_machine = "38cd560d5022ed2dbd1ab0dca9642e47c98a0aa1"
-     # SRCREV_meta = "a227f20eff056e511d504b2e490f3774ab260d6f"
-     SRCREV_meta = "a227f20eff056e511d504b2e490f3774ab260d6f"
-                </literallayout>
-                You can use the <filename>buildhistory-collect-srcrevs</filename>
-                command with the <filename>-a</filename> option to
-                collect the stored <filename>SRCREV</filename> values
-                from build history and report them in a format suitable for
-                use in global configuration (e.g.,
-                <filename>local.conf</filename> or a distro include file) to
-                override floating <filename>AUTOREV</filename> values to a
-                fixed set of revisions.
-                Here is some example output from this command:
-                <literallayout class='monospaced'>
-     $ buildhistory-collect-srcrevs -a
-     # i586-poky-linux
-     SRCREV_pn-glibc = "b8079dd0d360648e4e8de48656c5c38972621072"
-     SRCREV_pn-glibc-initial = "b8079dd0d360648e4e8de48656c5c38972621072"
-     SRCREV_pn-opkg-utils = "53274f087565fd45d8452c5367997ba6a682a37a"
-     SRCREV_pn-kmod = "fd56638aed3fe147015bfa10ed4a5f7491303cb4"
-     # x86_64-linux
-     SRCREV_pn-gtk-doc-stub-native = "1dea266593edb766d6d898c79451ef193eb17cfa"
-     SRCREV_pn-dtc-native = "65cc4d2748a2c2e6f27f1cf39e07a5dbabd80ebf"
-     SRCREV_pn-update-rc.d-native = "eca680ddf28d024954895f59a241a622dd575c11"
-     SRCREV_glibc_pn-cross-localedef-native = "b8079dd0d360648e4e8de48656c5c38972621072"
-     SRCREV_localedef_pn-cross-localedef-native = "c833367348d39dad7ba018990bfdaffaec8e9ed3"
-     SRCREV_pn-prelink-native = "faa069deec99bf61418d0bab831c83d7c1b797ca"
-     SRCREV_pn-opkg-utils-native = "53274f087565fd45d8452c5367997ba6a682a37a"
-     SRCREV_pn-kern-tools-native = "23345b8846fe4bd167efdf1bd8a1224b2ba9a5ff"
-     SRCREV_pn-kmod-native = "fd56638aed3fe147015bfa10ed4a5f7491303cb4"
-     # qemux86-poky-linux
-     SRCREV_machine_pn-linux-yocto = "38cd560d5022ed2dbd1ab0dca9642e47c98a0aa1"
-     SRCREV_meta_pn-linux-yocto = "a227f20eff056e511d504b2e490f3774ab260d6f"
-     # all-poky-linux
-     SRCREV_pn-update-rc.d = "eca680ddf28d024954895f59a241a622dd575c11"
-                </literallayout>
-                <note>
-                    Here are some notes on using the
-                    <filename>buildhistory-collect-srcrevs</filename> command:
-                    <itemizedlist>
-                        <listitem><para>By default, only values where the
-                            <filename>SRCREV</filename> was
-                            not hardcoded (usually when <filename>AUTOREV</filename>
-                            was used) are reported.
-                            Use the <filename>-a</filename> option to see all
-                            <filename>SRCREV</filename> values.
-                            </para></listitem>
-                        <listitem><para>The output statements might not have any effect
-                            if overrides are applied elsewhere in the build system
-                            configuration.
-                            Use the <filename>-f</filename> option to add the
-                            <filename>forcevariable</filename> override to each output line
-                            if you need to work around this restriction.
-                            </para></listitem>
-                        <listitem><para>The script does apply special handling when
-                            building for multiple machines.
-                            However, the script does place a
-                            comment before each set of values that specifies
-                            which triplet to which they belong as shown above
-                            (e.g., <filename>i586-poky-linux</filename>).
-                            </para></listitem>
-                    </itemizedlist>
-                </note>
-            </para>
-        </section>
-
-        <section id='build-history-image-information'>
-            <title>Build History Image Information</title>
-
-            <para>
-                The files produced for each image are as follows:
-                <itemizedlist>
-                    <listitem><para><filename>image-files:</filename>
-                        A directory containing selected files from the root
-                        filesystem.
-                        The files are defined by
-                        <link linkend='var-BUILDHISTORY_IMAGE_FILES'><filename>BUILDHISTORY_IMAGE_FILES</filename></link>.
-                        </para></listitem>
-                    <listitem><para><filename>build-id.txt:</filename>
-                        Human-readable information about the build configuration
-                        and metadata source revisions.
-                        This file contains the full build header as printed
-                        by BitBake.</para></listitem>
-                    <listitem><para><filename>*.dot:</filename>
-                        Dependency graphs for the image that are
-                        compatible with <filename>graphviz</filename>.
-                        </para></listitem>
-                    <listitem><para><filename>files-in-image.txt:</filename>
-                            A list of files in the image with permissions,
-                        owner, group, size, and symlink information.
-                        </para></listitem>
-                    <listitem><para><filename>image-info.txt:</filename>
-                        A text file containing name-value pairs with information
-                        about the image.
-                        See the following listing example for more information.
-                        </para></listitem>
-                    <listitem><para><filename>installed-package-names.txt:</filename>
-                        A list of installed packages by name only.</para></listitem>
-                    <listitem><para><filename>installed-package-sizes.txt:</filename>
-                        A list of installed packages ordered by size.
-                        </para></listitem>
-                    <listitem><para><filename>installed-packages.txt:</filename>
-                        A list of installed packages with full package
-                        filenames.</para></listitem>
-                </itemizedlist>
-                <note>
-                    Installed package information is able to be gathered and
-                    produced even if package management is disabled for the final
-                    image.
-                </note>
-            </para>
-
-            <para>
-                Here is an example of <filename>image-info.txt</filename>:
-                <literallayout class='monospaced'>
-     DISTRO = poky
-     DISTRO_VERSION = 1.7
-     USER_CLASSES = buildstats image-mklibs image-prelink
-     IMAGE_CLASSES = image_types
-     IMAGE_FEATURES = debug-tweaks
-     IMAGE_LINGUAS =
-     IMAGE_INSTALL = packagegroup-core-boot run-postinsts
-     BAD_RECOMMENDATIONS =
-     NO_RECOMMENDATIONS =
-     PACKAGE_EXCLUDE =
-     ROOTFS_POSTPROCESS_COMMAND = write_package_manifest; license_create_manifest; \
-        write_image_manifest ; buildhistory_list_installed_image ; \
-        buildhistory_get_image_installed ; ssh_allow_empty_password;  \
-        postinst_enable_logging; rootfs_update_timestamp ; ssh_disable_dns_lookup ;
-     IMAGE_POSTPROCESS_COMMAND =   buildhistory_get_imageinfo ;
-     IMAGESIZE = 6900
-                </literallayout>
-                Other than <filename>IMAGESIZE</filename>, which is the
-                total size of the files in the image in Kbytes, the
-                name-value pairs are variables that may have influenced the
-                content of the image.
-                This information is often useful when you are trying to determine
-                why a change in the package or file listings has occurred.
-            </para>
-        </section>
-
-        <section id='using-build-history-to-gather-image-information-only'>
-            <title>Using Build History to Gather Image Information Only</title>
-
-            <para>
-                As you can see, build history produces image information,
-                including dependency graphs, so you can see why something
-                was pulled into the image.
-                If you are just interested in this information and not
-                interested in collecting specific package or SDK information,
-                you can enable writing only image information without
-                any history by adding the following to your
-                <filename>conf/local.conf</filename> file found in the
-                <link linkend='build-directory'>Build Directory</link>:
-                <literallayout class='monospaced'>
-     INHERIT += "buildhistory"
-     BUILDHISTORY_COMMIT = "0"
-     BUILDHISTORY_FEATURES = "image"
-                </literallayout>
-                Here, you set the
-                <link linkend='var-BUILDHISTORY_FEATURES'><filename>BUILDHISTORY_FEATURES</filename></link>
-                variable to use the image feature only.
-            </para>
-        </section>
-
-        <section id='build-history-sdk-information'>
-            <title>Build History SDK Information</title>
-
-            <para>
-                Build history collects similar information on the contents
-                of SDKs
-                (e.g. <filename>bitbake -c populate_sdk imagename</filename>)
-                as compared to information it collects for images.
-                Furthermore, this information differs depending on whether an
-                extensible or standard SDK is being produced.
-            </para>
-
-            <para>
-                The following list shows the files produced for SDKs:
-                <itemizedlist>
-                    <listitem><para><filename>files-in-sdk.txt:</filename>
-                        A list of files in the SDK with permissions,
-                        owner, group, size, and symlink information.
-                        This list includes both the host and target parts
-                        of the SDK.
-                        </para></listitem>
-                    <listitem><para><filename>sdk-info.txt:</filename>
-                        A text file containing name-value pairs with information
-                        about the SDK.
-                        See the following listing example for more information.
-                        </para></listitem>
-                    <listitem><para><filename>sstate-task-sizes.txt:</filename>
-                        A text file containing name-value pairs with information
-                        about task group sizes
-                        (e.g. <filename>do_populate_sysroot</filename> tasks
-                        have a total size).
-                        The <filename>sstate-task-sizes.txt</filename> file
-                        exists only when an extensible SDK is created.
-                        </para></listitem>
-                    <listitem><para><filename>sstate-package-sizes.txt:</filename>
-                        A text file containing name-value pairs with information
-                        for the shared-state packages and sizes in the SDK.
-                        The <filename>sstate-package-sizes.txt</filename> file
-                        exists only when an extensible SDK is created.
-                        </para></listitem>
-                    <listitem><para><filename>sdk-files:</filename>
-                        A folder that contains copies of the files mentioned in
-                        <filename>BUILDHISTORY_SDK_FILES</filename> if the
-                        files are present in the output.
-                        Additionally, the default value of
-                        <filename>BUILDHISTORY_SDK_FILES</filename> is specific
-                        to the extensible SDK although you can set it
-                        differently if you would like to pull in specific files
-                        from the standard SDK.</para>
-                        <para>The default files are
-                        <filename>conf/local.conf</filename>,
-                        <filename>conf/bblayers.conf</filename>,
-                        <filename>conf/auto.conf</filename>,
-                        <filename>conf/locked-sigs.inc</filename>, and
-                        <filename>conf/devtool.conf</filename>.
-                        Thus, for an extensible SDK, these files get copied
-                        into the <filename>sdk-files</filename> directory.
-                        </para></listitem>
-                    <listitem><para>The following information appears under
-                        each of the <filename>host</filename>
-                        and <filename>target</filename> directories
-                        for the portions of the SDK that run on the host and
-                        on the target, respectively:
-                        <note>
-                            The following files for the most part are empty
-                            when producing an extensible SDK because this
-                            type of SDK is not constructed from packages as is
-                            the standard SDK.
-                        </note>
-                        <itemizedlist>
-                            <listitem><para><filename>depends.dot:</filename>
-                                Dependency graph for the SDK that is
-                                compatible with <filename>graphviz</filename>.
-                                </para></listitem>
-                            <listitem><para><filename>installed-package-names.txt:</filename>
-                                A list of installed packages by name only.
-                                </para></listitem>
-                            <listitem><para><filename>installed-package-sizes.txt:</filename>
-                                A list of installed packages ordered by size.
-                                </para></listitem>
-                            <listitem><para><filename>installed-packages.txt:</filename>
-                                A list of installed packages with full package
-                                filenames.</para></listitem>
-                            </itemizedlist>
-                        </para></listitem>
-                </itemizedlist>
-            </para>
-
-            <para>
-                Here is an example of <filename>sdk-info.txt</filename>:
-                <literallayout class='monospaced'>
-     DISTRO = poky
-     DISTRO_VERSION = 1.3+snapshot-20130327
-     SDK_NAME = poky-glibc-i686-arm
-     SDK_VERSION = 1.3+snapshot
-     SDKMACHINE =
-     SDKIMAGE_FEATURES = dev-pkgs dbg-pkgs
-     BAD_RECOMMENDATIONS =
-     SDKSIZE = 352712
-                </literallayout>
-                Other than <filename>SDKSIZE</filename>, which is the
-                total size of the files in the SDK in Kbytes, the
-                name-value pairs are variables that might have influenced the
-                content of the SDK.
-                This information is often useful when you are trying to
-                determine why a change in the package or file listings
-                has occurred.
-            </para>
-        </section>
-
-        <section id='examining-build-history-information'>
-            <title>Examining Build History Information</title>
-
-            <para>
-                You can examine build history output from the command line or
-                from a web interface.
-            </para>
-
-            <para>
-                To see any changes that have occurred (assuming you have
-                <link linkend='var-BUILDHISTORY_COMMIT'><filename>BUILDHISTORY_COMMIT = "1"</filename></link>),
-                you can simply
-                use any Git command that allows you to view the history of
-                a repository.
-                Here is one method:
-                <literallayout class='monospaced'>
-      $ git log -p
-                </literallayout>
-                You need to realize, however, that this method does show
-                changes that are not significant (e.g. a package's size
-                changing by a few bytes).
-            </para>
-
-            <para>
-                A command-line tool called <filename>buildhistory-diff</filename>
-                does exist, though, that queries the Git repository and prints just
-                the differences that might be significant in human-readable form.
-                Here is an example:
-                <literallayout class='monospaced'>
-     $ ~/poky/poky/scripts/buildhistory-diff . HEAD^
-     Changes to images/qemux86_64/glibc/core-image-minimal (files-in-image.txt):
-        /etc/anotherpkg.conf was added
-        /sbin/anotherpkg was added
-        * (installed-package-names.txt):
-        *   anotherpkg was added
-     Changes to images/qemux86_64/glibc/core-image-minimal (installed-package-names.txt):
-        anotherpkg was added
-     packages/qemux86_64-poky-linux/v86d: PACKAGES: added "v86d-extras"
-        * PR changed from "r0" to "r1"
-        * PV changed from "0.1.10" to "0.1.12"
-     packages/qemux86_64-poky-linux/v86d/v86d: PKGSIZE changed from 110579 to 144381 (+30%)
-        * PR changed from "r0" to "r1"
-        * PV changed from "0.1.10" to "0.1.12"
-                </literallayout>
-                <note>
-                    The <filename>buildhistory-diff</filename> tool requires
-                    the <filename>GitPython</filename> package.
-                    Be sure to install it using Pip3 as follows:
-                    <literallayout class='monospaced'>
-   $ pip3 install GitPython --user
-                    </literallayout>
-                    Alternatively, you can install
-                    <filename>python3-git</filename> using the appropriate
-                    distribution package manager (e.g.
-                    <filename>apt-get</filename>, <filename>dnf</filename>, or
-                    <filename>zipper</filename>).
-                </note>
-            </para>
-
-            <para>
-                To see changes to the build history using a web interface, follow
-                the instruction in the <filename>README</filename> file here.
-                <ulink url='http://git.yoctoproject.org/cgit/cgit.cgi/buildhistory-web/'></ulink>.
-            </para>
-
-            <para>
-                Here is a sample screenshot of the interface:
-                <imagedata fileref="figures/buildhistory-web.png" align="center" scalefit="1" width="130%" contentdepth="130%" />
-            </para>
-        </section>
-    </section>
-</section>
 
 <section id='speeding-up-the-build'>
     <title>Speeding Up the Build</title>