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@@ -5,25 +5,33 @@
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%general-entities;
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]>
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-<sect1 id="ch-tools-introduction">
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+<sect1 id="ch-tools-introduction-chroot">
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<?dbhtml filename="introduction.html"?>
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<title>Introduction</title>
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- <para>This chapter shows how to build a minimal Linux system.
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- This system will contain just enough tools to start constructing the final
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- LFS system in <xref linkend="chapter-building-system"/> and allow a working
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- environment with more user convenience than a minimum environment would.</para>
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+ <para>This chapter shows how to build the last missing bits of the
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+ temporary system: first, the tools needed by the build machinery of
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+ various packages, then three packages needed to run tests.
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+ Now that all circular dependencies have been resolved,
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+ we can use a <quote>chroot</quote> environment, completely isolated
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+ from the computer used for the build, except for the running kernel.</para>
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+
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+ <para>For proper operation of the isolated environment, some communication
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+ with the running kernel must be established. This is done through the
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+ so-called <emphasis>Virtual Kernel File Systems</emphasis>, which must be
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+ mounted when entering the chroot environment. You may want to check
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+ that they are mounted by issuing <command>ls $LFS/dev</command>,
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+ <command>ls $LFS/proc</command>, or <command>ls $LFS/sys</command>.
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+ Note that mounting the virtual kernel file systems must be done
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+ <emphasis>each time you want to enter the chroot
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+ environment</emphasis>.</para>
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+
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+ <para>Until <xref linkend="ch-tools-chroot"/>, the commands must be
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+ run as <systemitem class="username">root</systemitem>, with the
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+ <envar>LFS</envar> variable set. After entering chroot, all commands
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+ are run as root, fortunately without access to the OS of the computer
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+ you build LFS on. Be careful anyway, as it is easy to destroy the whole
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+ LFS system with badly formed commands.</para>
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- <para>There are two steps in building this minimal system. The first step
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- is to build a new and host-independent toolchain (compiler, assembler,
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- linker, libraries, and a few useful utilities). The second step uses this
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- toolchain to build the other essential tools.</para>
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-<!--
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- <para>The files compiled in this chapter will be installed under the
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- <filename class="directory">$LFS</filename> directory to keep them
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- separate from the files installed in the next chapter and the host
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- production directories. Since the packages compiled here are temporary,
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- we do not want them to pollute the soon-to-be LFS system.</para>
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--->
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</sect1>
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Pierre Labastie