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authorRalph Amissah <ralph.amissah@gmail.com>2021-11-27 21:54:49 -0500
committerRalph Amissah <ralph.amissah@gmail.com>2021-11-27 21:54:49 -0500
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+:B~ Customizing contents
+
+1~customization-overview Customization overview
+
+This chapter gives an overview of the various ways in which you may
+customize a live system.
+
+2~ Build time vs. boot time configuration
+
+Live system configuration options are divided into build-time options which
+are options that are applied at build time and boot-time options which are
+applied at boot time. Boot-time options are further divided into those
+occurring early in the boot, applied by the live-boot package, and those
+that happen later in the boot, applied by live-config. Any boot-time option
+may be modified by the user by specifying it at the boot prompt. The image
+may also be built with default boot parameters so users can normally just
+boot directly to the live system without specifying any options when all of
+the defaults are suitable. In particular, the argument to #{lb
+--bootappend-live}# consists of any default kernel command line options for
+the Live system, such as persistence, keyboard layouts, or timezone. See
+{Customizing locale and language}#customizing-locale-and-language, for
+example.
+
+Build-time configuration options are described in the #{lb config}# man
+page. Boot-time options are described in the man pages for live-boot and
+live-config. Although the live-boot and live-config packages are installed
+within the live system you are building, it is recommended that you also
+install them on your build system for easy reference when you are working on
+your configuration. It is safe to do so, as none of the scripts contained
+within them are executed unless the system is configured as a live system.
+
+2~stages-of-the-build Stages of the build
+
+The build process is divided into stages, with various customizations
+applied in sequence in each. The first stage to run is the *{bootstrap}*
+stage. This is the initial phase of populating the chroot directory with
+packages to make a barebones Debian system. This is followed by the
+*{chroot}* stage, which completes the construction of chroot directory,
+populating it with all of the packages listed in the configuration, along
+with any other materials. Most customization of content occurs in this
+stage. The final stage of preparing the live image is the *{binary}* stage,
+which builds a bootable image, using the contents of the chroot directory to
+construct the root filesystem for the Live system, and including the
+installer and any other additional material on the target medium outside of
+the Live system's filesystem. After the live image is built, if enabled, the
+source tarball is built in the *{source}* stage.
+
+Within each of these stages, there is a particular sequence in which
+commands are applied. These are arranged in such a way as to ensure
+customizations can be layered in a reasonable fashion. For example, within
+the *{chroot}* stage, preseeds are applied before any packages are
+installed, packages are installed before any locally included files are
+copied, and hooks are run later, after all of the materials are in place.
+
+2~ Supplement lb config with files
+
+Although #{lb config}# creates a skeletal configuration in the #{config/}#
+directory, to accomplish your goals, you may need to provide additional
+files in subdirectories of #{config/}#. Depending on where the files are
+stored in the configuration, they may be copied into the live system's
+filesystem or into the binary image filesystem, or may provide build-time
+configurations of the system that would be cumbersome to pass as
+command-line options. You may include things such as custom lists of
+packages, custom artwork, or hook scripts to run either at build time or at
+boot time, boosting the already considerable flexibility of debian-live with
+code of your own.
+
+2~ Customization tasks
+
+The following chapters are organized by the kinds of customization task
+users typically perform: {Customizing package
+installation}#customizing-package-installation, {Customizing
+contents}#customizing-contents and {Customizing locale and
+language}#customizing-locale-and-language cover just a few of the things you
+might want to do.