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-:B~ Overview of tools
-
-1~overview-of-tools Overview of tools
-
-This chapter contains an overview of the three main tools used in building
-live systems: live-build, live-boot and live-config.
-
-2~live-build The live-build package
-
-live-build is a collection of scripts to build live systems. These scripts
-are also referred to as "commands".
-
-The idea behind live-build is to be a framework that uses a configuration
-directory to completely automate and customize all aspects of building a
-Live image.
-
-Many concepts are similar to those used to build Debian packages with
-/{debhelper}/:
-
-_* The scripts have a central location for configuring their operation. In
-/{debhelper}/, this is the #{debian/}# subdirectory of a package tree. For
-example, dh_install will look, among others, for a file called
-#{debian/install}# to determine which files should exist in a particular
-binary package. In much the same way, live-build stores its configuration
-entirely under a #{config/}# subdirectory.
-
-_* The scripts are independent - that is to say, it is always safe to run
-each command.
-
-Unlike /{debhelper}/, live-build provides the tools to generate a skeleton
-configuration directory. This could be considered to be similar to tools
-such as /{dh-make}/. For more information about these tools, read on, since
-the remainder of this section discuses the four most important
-commands. Note that the preceding #{lb}# is a generic wrapper for live-build
-commands.
-
-_* *{lb config}*: Responsible for initializing a Live system configuration
-directory. See {The lb config command}#lb-config for more information.
-
-_* *{lb build}*: Responsible for starting a Live system build. See {The lb
-build command}#lb-build for more information.
-
-_* *{lb clean}*: Responsible for removing parts of a Live system build. See
-{The lb clean command}#lb-clean for more information.
-
-3~lb-config The #{lb config}# command
-
-As discussed in {live-build}#live-build, the scripts that make up live-build
-read their configuration with the #{source}# command from a single directory
-named #{config/}#. As constructing this directory by hand would be
-time-consuming and error-prone, the #{lb config}# command can be used to
-create the initial skeleton configuration tree.
-
-Issuing #{lb config}# without any arguments creates the #{config/}#
-subdirectory which is populated with some default settings in configuration
-files, and two skeleton trees named #{auto/}# and #{local/}#.
-
-code{
-
- $ lb config
- [2015-01-06 19:25:58] lb config
- P: Creating config tree for a debian/stretch/i386 system
- P: Symlinking hooks...
-
-}code
-
-Using #{lb config}# without any arguments would be suitable for users who
-need a very basic image, or who intend to provide a more complete
-configuration via #{auto/config}# later (see {Managing a
-configuration}#managing-a-configuration for details).
-
-Normally, you will want to specify some options. For example, to specify
-which package manager to use while building the image:
-
-code{
-
- $ lb config --apt aptitude
-
-}code
-
-It is possible to specify many options, such as:
-
-code{
-
- $ lb config --binary-images netboot --bootappend-live "boot=live components hostname=live-host username=live-user" ...
-
-}code
-
-A full list of options is available in the #{lb_config}# man page.
-
-3~lb-build The #{lb build}# command
-
-The #{lb build}# command reads in your configuration from the #{config/}#
-directory. It then runs the lower level commands needed to build your Live
-system.
-
-3~lb-clean The #{lb clean}# command
-
-It is the job of the #{lb clean}# command to remove various parts of a build
-so subsequent builds can start from a clean state. By default, #{chroot}#,
-#{binary}# and #{source}# stages are cleaned, but the cache is left
-intact. Also, individual stages can be cleaned. For example, if you have
-made changes that only affect the binary stage, use #{lb clean --binary}#
-prior to building a new binary. If your changes invalidate the bootstrap
-and/or package caches, e.g. changes to #{--mode}#, #{--architecture}#, or
-#{--bootstrap}#, you must use #{lb clean --purge}#. See the #{lb_clean}# man
-page for a full list of options.
-
-2~live-boot The live-boot package
-
-live-boot is a collection of scripts providing hooks for the
-/{initramfs-tools}/, used to generate an initramfs capable of booting live
-systems, such as those created by live-build. This includes the live system
-ISOs, netboot tarballs, and USB stick images.
-
-At boot time it will look for read-only media containing a #{/live/}#
-directory where a root filesystem (often a compressed filesystem image like
-squashfs) is stored. If found, it will create a writable environment, using
-aufs, for Debian like systems to boot from.
-
-More information on initial ramfs in Debian can be found in the Debian Linux
-Kernel Handbook at http://kernel-handbook.alioth.debian.org/ in the chapter
-on initramfs.
-
-2~live-config The live-config package
-
-live-config consists of the scripts that run at boot time after live-boot to
-configure the live system automatically. It handles such tasks as setting
-the hostname, locales and timezone, creating the live user, inhibiting cron
-jobs and performing autologin of the live user.