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<h1 id="extension-hooks">Extension Hooks<a class="headerlink" href="#extension-hooks" title="Permanent link">&para;</a></h1>
<ul>
<li>This file is autogenerated by the armbian/build repository.</li>
</ul>
<h2 id="hooks">Hooks<a class="headerlink" href="#hooks" title="Permanent link">&para;</a></h2>
<ul>
<li>Hooks are listed in the order they are called.</li>
</ul>
<h3 id="post_family_config"><code>post_family_config</code><a class="headerlink" href="#post_family_config" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>give the config a chance to override the family/arch defaults</em></p>
</blockquote>
<p>This hook is called after the family configuration (<code>sources/families/xxx.conf</code>) is sourced. Since the family can
override values from the user configuration and the board configuration, it is often used to in turn override those.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_tweaks_post_family_config</code></li>
</ul>
<h3 id="user_config"><code>user_config</code><a class="headerlink" href="#user_config" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>Invoke function with user override</em></p>
</blockquote>
<p>Allows for overriding configuration values set anywhere else. It is called after sourcing the <code>lib.config</code> file if it
exists, but before assembling any package lists.</p>
<h3 id="extension_prepare_config"><code>extension_prepare_config</code><a class="headerlink" href="#extension_prepare_config" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>allow extensions to prepare their own config, after user config is done</em></p>
</blockquote>
<p>Implementors should preserve variable values pre-set, but can default values an/or validate them. This runs <em>after</em>
user_config. Don&rsquo;t change anything not coming from other variables or meant to be configured by the user.</p>
<h3 id="post_aggregate_packages"><code>post_aggregate_packages</code><a class="headerlink" href="#post_aggregate_packages" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>For final user override, using a function, after all aggregations are done</em></p>
</blockquote>
<p>Called after aggregating all package lists, before the end of <code>compilation.sh</code>. Packages will still be installed after
this is called, so it is the last chance to confirm or change any packages.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>user_config_post_aggregate_packages</code></li>
</ul>
<h3 id="post_determine_cthreads"><code>post_determine_cthreads</code><a class="headerlink" href="#post_determine_cthreads" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>give config a chance modify CTHREADS programatically. A build server may work better with hyperthreads-1 for example.</em></p>
</blockquote>
<p>Called early, before any compilation work starts.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_post_determine_cthreads</code></li>
</ul>
<h3 id="add_host_dependencies"><code>add_host_dependencies</code><a class="headerlink" href="#add_host_dependencies" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>run before installing host dependencies</em></p>
</blockquote>
<p>you can add packages to install, space separated, to ${EXTRA_BUILD_DEPS} here.</p>
<h3 id="fetch_sources_tools"><code>fetch_sources_tools</code><a class="headerlink" href="#fetch_sources_tools" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>fetch host-side sources needed for tools and build</em></p>
</blockquote>
<p>Run early to fetch_from_repo or otherwise obtain sources for needed tools.</p>
<h3 id="build_host_tools"><code>build_host_tools</code><a class="headerlink" href="#build_host_tools" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>build needed tools for the build, host-side</em></p>
</blockquote>
<p>After sources are fetched, build host-side tools needed for the build.</p>
<h3 id="pre_install_distribution_specific"><code>pre_install_distribution_specific</code><a class="headerlink" href="#pre_install_distribution_specific" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>give config a chance to act before install_distribution_specific</em></p>
</blockquote>
<p>Called after <code>create_rootfs_cache</code> (<em>prepare basic rootfs: unpack cache or create from scratch</em>) but
before <code>install_distribution_specific</code> (<em>install distribution and board specific applications</em>).</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_pre_install_distribution_specific</code></li>
</ul>
<h3 id="pre_install_kernel_debs"><code>pre_install_kernel_debs</code><a class="headerlink" href="#pre_install_kernel_debs" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>called before installing the Armbian-built kernel deb packages</em></p>
</blockquote>
<p>It is not too late to <code>unset KERNELSOURCE</code> here and avoid kernel install.</p>
<h3 id="post_install_kernel_debs"><code>post_install_kernel_debs</code><a class="headerlink" href="#post_install_kernel_debs" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>allow config to do more with the installed kernel/headers</em></p>
</blockquote>
<p>Called after packages, u-boot, kernel and headers installed in the chroot, but before the BSP is installed.
If <code>KERNELSOURCE</code> is (still?) unset after this, Armbian-built firmware will not be installed.</p>
<h3 id="post_family_tweaks"><code>post_family_tweaks</code><a class="headerlink" href="#post_family_tweaks" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>customize the tweaks made by $LINUXFAMILY-specific family_tweaks</em></p>
</blockquote>
<p>It is run after packages are installed in the rootfs, but before enabling additional services. It allows implementors
access to the rootfs (<code>${SDCARD}</code>) in its pristine state after packages are installed.</p>
<h3 id="pre_customize_image"><code>pre_customize_image</code><a class="headerlink" href="#pre_customize_image" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>run before customize-image.sh</em></p>
</blockquote>
<p>This hook is called before <code>customize-image.sh</code> is executed and before the overlay is mounted. It thus can be used
for the same purposes as <code>customize-image.sh</code> without the overlay.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>image_tweaks_pre_customize</code></li>
</ul>
<h3 id="post_customize_image"><code>post_customize_image</code><a class="headerlink" href="#post_customize_image" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>post customize-image.sh hook</em></p>
</blockquote>
<p>Run after the customize-image.sh script is run, and the overlay is unmounted.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>image_tweaks_post_customize</code></li>
</ul>
<h3 id="post_post_debootstrap_tweaks"><code>post_post_debootstrap_tweaks</code><a class="headerlink" href="#post_post_debootstrap_tweaks" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>run after removing diversions and qemu with chroot unmounted</em></p>
</blockquote>
<p>Last chance to touch the <code>${SDCARD}</code> filesystem before it is copied to the final media. It is too late to run any
chrooted commands, since the supporting filesystems are already unmounted.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_post_debootstrap_tweaks</code></li>
</ul>
<h3 id="pre_prepare_partitions"><code>pre_prepare_partitions</code><a class="headerlink" href="#pre_prepare_partitions" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>allow custom options for mkfs</em></p>
</blockquote>
<p>Good time to change stuff like mkfs opts, types etc.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>prepare_partitions_custom</code></li>
</ul>
<h3 id="prepare_image_size"><code>prepare_image_size</code><a class="headerlink" href="#prepare_image_size" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>allow dynamically determining the size based on the $rootfs_size</em></p>
</blockquote>
<p>Called after <code>${rootfs_size}</code> is known, but before <code>${FIXED_IMAGE_SIZE}</code> is taken into account. A good spot to
determine <code>FIXED_IMAGE_SIZE</code> based on <code>rootfs_size</code>. UEFISIZE can be set to 0 for no UEFI partition, or to a size in MiB
to include one. Last chance to set <code>USE_HOOK_FOR_PARTITION</code>=yes and then implement create_partition_table hook_point.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_prepare_image_size</code></li>
</ul>
<h3 id="post_create_partitions"><code>post_create_partitions</code><a class="headerlink" href="#post_create_partitions" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>called after all partitions are created, but not yet formatted</em></p>
</blockquote>
<h3 id="format_partitions"><code>format_partitions</code><a class="headerlink" href="#format_partitions" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>if you created your own partitions, this would be a good time to format them</em></p>
</blockquote>
<p>The loop device is mounted, so ${LOOP}p1 is it&rsquo;s first partition etc.</p>
<h3 id="pre_update_initramfs"><code>pre_update_initramfs</code><a class="headerlink" href="#pre_update_initramfs" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>allow config to hack into the initramfs create process</em></p>
</blockquote>
<p>Called after rsync has synced both <code>/root</code> and <code>/root</code> on the target, but before calling <code>update_initramfs</code>.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_pre_update_initramfs</code></li>
</ul>
<h3 id="pre_umount_final_image"><code>pre_umount_final_image</code><a class="headerlink" href="#pre_umount_final_image" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>allow config to hack into the image before the unmount</em></p>
</blockquote>
<p>Called before unmounting both <code>/root</code> and <code>/boot</code>.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_pre_umount_final_image</code></li>
</ul>
<h3 id="post_umount_final_image"><code>post_umount_final_image</code><a class="headerlink" href="#post_umount_final_image" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>allow config to hack into the image after the unmount</em></p>
</blockquote>
<p>Called after unmounting both <code>/root</code> and <code>/boot</code>.</p>
<p>Also known as (for backwards compatibility only):</p>
<ul>
<li><code>config_post_umount_final_image</code></li>
</ul>
<h3 id="post_build_image"><code>post_build_image</code><a class="headerlink" href="#post_build_image" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>custom post build hook</em></p>
</blockquote>
<p>Called after the final .img file is built, before it is (possibly) written to an SD writer.</p>
<ul>
<li><em>NOTE</em>: this hook used to take an argument ($1) for the final image produced.
- Now it is passed as an environment variable <code>${FINAL_IMAGE_FILE}</code>
It is the last possible chance to modify <code>$CARD_DEVICE</code>.</li>
</ul>
<h3 id="run_after_build"><code>run_after_build</code><a class="headerlink" href="#run_after_build" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>hook for function to run after build, i.e. to change owner of <code>$SRC</code></em></p>
</blockquote>
<p>Really one of the last hooks ever called. The build has ended. Congratulations.</p>
<ul>
<li><em>NOTE:</em> this will run only if there were no errors during build process.</li>
</ul>
<h3 id="extension_metadata_ready"><code>extension_metadata_ready</code><a class="headerlink" href="#extension_metadata_ready" title="Permanent link">&para;</a></h3>
<blockquote>
<p><em>meta-Meta time!</em></p>
</blockquote>
<p>Implement this hook to work with/on the meta-data made available by the extension manager. Interesting stuff to process:</p>
<ul>
<li><code>"${EXTENSION_MANAGER_TMP_DIR}/hook_point_calls.txt"</code> contains a list of all hook points called, in order.</li>
<li>For each hook_point in the list, more files will have metadata about that hook point.
- <code>${EXTENSION_MANAGER_TMP_DIR}/hook_point.orig.md</code> contains the hook documentation at the call site (inline docs),
hopefully in Markdown format.
- <code>${EXTENSION_MANAGER_TMP_DIR}/hook_point.compat</code> contains the compatibility names for the hooks.
- <code>${EXTENSION_MANAGER_TMP_DIR}/hook_point.exports</code> contains <em>exported</em> environment variables.
- <code>${EXTENSION_MANAGER_TMP_DIR}/hook_point.vars</code> contains <em>all</em> environment variables.</li>
<li><code>${defined_hook_point_functions}</code> is a map of <em>all</em> the defined hook point functions and their extension information.</li>
<li><code>${hook_point_function_trace_sources}</code> is a map of all the hook point functions <em>that were really called during the
build</em> and their BASH_SOURCE information.</li>
<li><code>${hook_point_function_trace_lines}</code> is the same, but BASH_LINENO info. After this hook is done,
the <code>${EXTENSION_MANAGER_TMP_DIR}</code> will be removed.</li>
</ul>
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