[3f8be484] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" |
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ |
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent"> |
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| 5 | %general-entities; |
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| 6 | ]> |
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| 7 | |
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| 8 | <sect1 id="ch-chroot-devices"> |
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| 9 | <?dbhtml filename="devices.html"?> |
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| 10 | |
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| 11 | <title>Populating /dev</title> |
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| 12 | |
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| 13 | <indexterm zone="ch-chroot-devices"> |
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| 14 | <primary sortas="e-/dev/*">/dev/*</primary> |
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| 15 | </indexterm> |
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| 16 | |
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| 17 | <sect2> |
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| 18 | <title>Creating Initial Device Nodes</title> |
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| 19 | |
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| 20 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" |
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| 21 | href="../../boot/common/devices.xml" |
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[f15e0d6] | 22 | xpointer="xpointer(//*[@os='b'])"/> |
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[3f8be484] | 23 | |
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| 24 | <screen><userinput>mknod -m 600 /dev/console c 5 1 |
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| 25 | mknod -m 666 /dev/null c 1 3</userinput></screen> |
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| 26 | |
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| 27 | </sect2> |
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| 28 | |
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| 29 | <sect2> |
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| 30 | <title>Mounting tmpfs and Populating /dev</title> |
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| 31 | |
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| 32 | <para>The recommended method of populating the <filename |
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| 33 | class="directory">/dev</filename> directory with devices is to |
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| 34 | mount a virtual filesystem (such as <systemitem |
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| 35 | class="filesystem">tmpfs</systemitem>) on the <filename |
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| 36 | class="directory">/dev</filename> directory, and allow the devices |
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| 37 | to be created dynamically on that virtual filesystem as they are |
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| 38 | detected or accessed. This is generally done during the boot process. |
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| 39 | Since this new system has not been booted, it is necessary to do what |
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| 40 | the LFS-Bootscripts package would otherwise do by mounting <filename |
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| 41 | class="directory">/dev</filename>:</para> |
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| 42 | |
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[94e6142] | 43 | <screen><userinput>mount -n -vt tmpfs none /dev</userinput></screen> |
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[3f8be484] | 44 | |
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| 45 | <para>The Udev package is what actually creates the devices in the |
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| 46 | <filename class="directory">/dev</filename> directory. Since it will |
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| 47 | not be installed until later on in the process, manually create the |
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| 48 | minimal set of device nodes needed to complete the building of this |
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| 49 | system:</para> |
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| 50 | |
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| 51 | <screen><userinput>mknod -m 622 /dev/console c 5 1 |
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| 52 | mknod -m 666 /dev/null c 1 3 |
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| 53 | mknod -m 666 /dev/zero c 1 5 |
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| 54 | mknod -m 666 /dev/ptmx c 5 2 |
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| 55 | mknod -m 666 /dev/tty c 5 0 |
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| 56 | mknod -m 444 /dev/random c 1 8 |
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| 57 | mknod -m 444 /dev/urandom c 1 9 |
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[94e6142] | 58 | chown -v root:tty /dev/{console,ptmx,tty}</userinput></screen> |
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[3f8be484] | 59 | |
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| 60 | <para>There are some symlinks and directories required by LFS that |
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| 61 | are created during system startup by the LFS-Bootscripts package. Since |
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| 62 | this is a chroot environment and not a booted environment, those symlinks |
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| 63 | and directories need to be created here:</para> |
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| 64 | |
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[94e6142] | 65 | <screen><userinput>ln -sv /proc/self/fd /dev/fd |
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| 66 | ln -sv /proc/self/fd/0 /dev/stdin |
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| 67 | ln -sv /proc/self/fd/1 /dev/stdout |
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| 68 | ln -sv /proc/self/fd/2 /dev/stderr |
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| 69 | ln -sv /proc/kcore /dev/core |
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| 70 | mkdir -v /dev/pts |
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| 71 | mkdir -v /dev/shm</userinput></screen> |
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[3f8be484] | 72 | |
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| 73 | <para>Finally, mount the proper virtual (kernel) file systems on the |
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| 74 | newly-created directories:</para> |
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| 75 | |
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[94e6142] | 76 | <screen><userinput>mount -vt devpts -o gid=4,mode=620 none /dev/pts |
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| 77 | mount -vt tmpfs none /dev/shm</userinput></screen> |
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[3f8be484] | 78 | |
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| 79 | <para>The <command>mount</command> commands executed above may result |
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| 80 | in the following warning message:</para> |
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| 81 | |
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| 82 | <screen><computeroutput>can't open /etc/fstab: No such file or directory.</computeroutput></screen> |
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| 83 | |
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| 84 | <para>This file—<filename>/etc/fstab</filename>—has not |
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| 85 | been created yet but is also not required for the file systems to be |
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| 86 | properly mounted. As such, the warning can be safely ignored.</para> |
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| 87 | |
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| 88 | </sect2> |
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| 89 | |
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| 90 | </sect1> |
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