Changeset 27e1607


Ignore:
Timestamp:
May 29, 2006, 2:45:38 AM (13 years ago)
Author:
Jeremy Utley <jerutley@…>
Branches:
clfs-1.2, clfs-2.1, clfs-3.0.0-systemd, clfs-3.0.0-sysvinit, master, systemd, sysvinit
Children:
a8952fe
Parents:
7eb92df
Message:

Mount --bind host /dev to LFS's dev on chroot builds - fixes ticket #27

Location:
BOOK/chroot/common
Files:
2 edited

Legend:

Unmodified
Added
Removed
  • BOOK/chroot/common/devices.xml

    r7eb92df r27e1607  
    99  <?dbhtml filename="devices.html"?>
    1010
    11   <title>Populating /dev</title>
     11  <title>Mounting Kernel Filesystems</title>
    1212
    1313  <indexterm zone="ch-chroot-devices">
     
    1616
    1717  <sect2>
    18     <title>Creating Initial Device Nodes</title>
     18    <title>Mounting Additional Kernel Filesystems</title>
    1919
    20     <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    21     href="../../boot/common/devices.xml"
    22     xpointer="xpointer(//*[@os='b'])"/>
    23 
    24 <screen><userinput>mknod -m 600 /dev/console c 5 1
    25 mknod -m 666 /dev/null c 1 3</userinput></screen>
    26 
    27   </sect2>
    28 
    29   <sect2>
    30     <title>Mounting tmpfs and Populating /dev</title>
    31 
    32     <para>The recommended method of populating the <filename
    33     class="directory">/dev</filename> directory with devices is to
    34     mount a virtual filesystem (such as <systemitem
    35     class="filesystem">tmpfs</systemitem>) on the <filename
    36     class="directory">/dev</filename> directory, and allow the devices
    37     to be created dynamically on that virtual filesystem as they are
    38     detected or accessed. This is generally done during the boot process.
    39     Since this new system has not been booted, it is necessary to do what
    40     the LFS-Bootscripts package would otherwise do by mounting <filename
    41     class="directory">/dev</filename>:</para>
    42 
    43 <screen><userinput>mount -n -vt tmpfs none /dev</userinput></screen>
    44 
    45     <para>The Udev package is what actually creates the devices in the
    46     <filename class="directory">/dev</filename> directory. Since it will
    47     not be installed until later on in the process, manually create the
    48     minimal set of device nodes needed to complete the building of this
    49     system:</para>
    50 
    51 <screen><userinput>mknod -m 622 /dev/console c 5 1
    52 mknod -m 666 /dev/null c 1 3
    53 mknod -m 666 /dev/zero c 1 5
    54 mknod -m 666 /dev/ptmx c 5 2
    55 mknod -m 666 /dev/tty c 5 0
    56 mknod -m 444 /dev/random c 1 8
    57 mknod -m 444 /dev/urandom c 1 9
    58 chown -v root:tty /dev/{console,ptmx,tty}</userinput></screen>
    59 
    60     <para>There are some symlinks and directories required by LFS that
    61     are created during system startup by the LFS-Bootscripts package. Since
    62     this is a chroot environment and not a booted environment, those symlinks
    63     and directories need to be created here:</para>
    64 
    65 <screen><userinput>ln -sv /proc/self/fd /dev/fd
    66 ln -sv /proc/self/fd/0 /dev/stdin
    67 ln -sv /proc/self/fd/1 /dev/stdout
    68 ln -sv /proc/self/fd/2 /dev/stderr
    69 ln -sv /proc/kcore /dev/core
    70 mkdir -v /dev/pts
    71 mkdir -v /dev/shm</userinput></screen>
    72 
    73     <para>Finally, mount the proper virtual (kernel) file systems on the
     20    <para>Mount the proper virtual (kernel) file systems on the
    7421    newly-created directories:</para>
    7522
  • BOOK/chroot/common/kernfs.xml

    r7eb92df r27e1607  
    3434  are mounted again before entering the chroot environment.</para>
    3535
    36   <para>Additional file systems will soon be mounted from within the
    37   chroot environment. To keep the host up to date, perform a <quote>fake
    38   mount</quote> for each of these now:</para>
     36  <para>Two device nodes, /dev/console and /dev/null, are required to be
     37  present on the filesystem.  These are needed by the kernel even before
     38  starting Udev early in the boot process, so we create them here:</para>
    3939
    40 <screen><userinput>mount -f -vt tmpfs tmpfs $LFS/dev
    41 mount -f -vt tmpfs tmpfs $LFS/dev/shm
     40<screen><userinput>mknod -m 600 $LFS/dev/console c 5 1
     41mknod -m 666 $LFS/dev/null c 1 3</userinput></screen>
     42
     43  <para>Once the system is complete and booting, the rest of our device
     44  nodes are created by the Udev package.  Since this package is not
     45  available to us right now, we must take other steps to provide device
     46  nodes under on the LFS filesystem.  We will use the <quote>bind</quote>
     47  option in the mount command to make our host system's /dev structure
     48  appear in the new LFS filesystem:</para>
     49
     50<screen><userinput>/tools/bin/mount -o bind /dev $LFS/dev</userinput></screen>
     51
     52  <para>Additional file systems will soon be mounted from within the chroot
     53  environment. To keep the host up to date, perform a <quote>fake mount</quote>
     54  for each of these now:</para>
     55
     56<screen><userinput>mount -f -vt tmpfs tmpfs $LFS/dev/shm
    4257mount -f -vt devpts -o gid=10,mode=620 devpts $LFS/dev/pts</userinput></screen>
    4358
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