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kernfs: technically, they are not needed for chroot

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Chroot command itself does not require kernel VFS mounted. You can mount
/proc, /sys, and /run after entering chroot with
"mount -v -t proc proc /proc" etc.  For /dev, if the host kernel
supports devtmpfs, you can also mount /dev in chroot with
"mount -v -t devtmpfs devtmpfs /dev".  Even if the host does not support
devtmpfs, it's still possible to mount /proc in chroot, then use
"mount --bind /proc/1/dev /dev".

It's just LFS editors decide to mount them before chroot.  So reword
some untrue assertions.
This commit is contained in:
Xi Ruoyao 2022-10-01 12:41:42 +08:00
parent 36cb08fbf0
commit a8f3814a7b
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2
chapter07/introduction.xml
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@ -18,7 +18,7 @@
<para>For proper operation of the isolated environment, some communication <para>For proper operation of the isolated environment, some communication
with the running kernel must be established. This is done via the with the running kernel must be established. This is done via the
so-called <emphasis>Virtual Kernel File Systems</emphasis>, which must be so-called <emphasis>Virtual Kernel File Systems</emphasis>, which will be
mounted before entering the chroot environment. You may want to verify mounted before entering the chroot environment. You may want to verify
that they are mounted by issuing the <command>findmnt</command> command.</para> that they are mounted by issuing the <command>findmnt</command> command.</para>

4
chapter07/kernfs.xml
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@ -18,8 +18,8 @@
systems exported by the kernel to communicate systems exported by the kernel to communicate
with the kernel itself. These file systems are virtual: no disk with the kernel itself. These file systems are virtual: no disk
space is used for them. The content of the file systems resides in space is used for them. The content of the file systems resides in
memory. These file systems must exist in the $LFS directory tree memory. These file systems must be mounted in the $LFS directory tree
before you can <command>chroot</command> successfully.</para> so the applications can find them in the chroot environment.</para>
<para>Begin by creating directories on which the file systems will be <para>Begin by creating directories on which the file systems will be
mounted:</para> mounted:</para>