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Fix the udev_retry script, and add an explanation

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for how to configure it.


git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9614 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
This commit is contained in:
Bruce Dubbs 2011-10-06 15:35:49 +00:00
parent b777a9ed50
commit 2a1c1e03a4
7 changed files with 67 additions and 28 deletions
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9
bootscripts/ChangeLog
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@ -1,4 +1,11 @@
2100-09-18
2011-10-06 Bryan Kadzban <bryan@linuxfromscratch.org>
* Add configuration for udev_retry, and remove --type=failed (which does
not work with recent udev versions anyway, since no events can possibly
trigger it). Start with just the "rtc" subsystem. BLFS should eventually
add "sound" to this file, and perhaps others.
2011-09-18
* Review and update of changes made in previous change.
** Rename /etc/sysconfig/init_params to /etc/sysconfig/rc.site.
** Move network services to /lib/services.

3
bootscripts/Makefile
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@ -60,6 +60,9 @@ files: create-dirs
if [ ! -f ${EXTDIR}/sysconfig/modules ]; then \
install -m ${CONFMODE} lfs/sysconfig/modules ${EXTDIR}/sysconfig/ ;\
fi
if [ ! -f ${EXTDIR}/sysconfig/udev_retry ]; then \
install -m ${CONFMODE} lfs/sysconfig/udev_retry ${EXTDIR}/sysconfig/ ;\
fi
if [ ! -f ${EXTDIR}/sysconfig/rc ]; then \
install -m ${CONFMODE} lfs/sysconfig/rc ${EXTDIR}/sysconfig/ ;\
fi

11
bootscripts/lfs/init.d/udev_retry
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@ -7,6 +7,7 @@
# Authors : Alexander E. Patrakov
# DJ Lucas - dj@linuxfromscratch.org
# Update : Bruce Dubbs - bdubbs@linuxfromscratch.org
# Bryan Kadzban -
#
# Version : LFS 7.0
#
@ -44,8 +45,14 @@ case "${1}" in
rm -f $file
done
# Re-trigger the failed uevents in hope they will succeed now
/sbin/udevadm trigger --type=failed --action=add
# Re-trigger the uevents that may have failed,
# in hope they will succeed now
/bin/sed -e 's/#.*$//' /etc/sysconfig/udev_retry | /bin/grep -v '^$' | \
while read line ; do
for subsystem in $line ; do
/sbin/udevadm trigger --subsystem-match=$subsystem --action=add
done
done
# Now wait for udevd to process the uevents we triggered
/sbin/udevadm settle

10
chapter01/changelog.xml
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@ -36,6 +36,16 @@
</listitem>
-->
<listitem>
<para>2011-10-06</para>
<itemizedlist>
<listitem>
<para>[bryan] - Fix the udev_retry script, and add an explanation
for how to configure it.</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>2011-10-05</para>
<itemizedlist>

56
chapter07/udev.xml
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@ -93,40 +93,52 @@
</sect3>
<sect3>
<title>Udev Bootscript</title>
<title>Udev Bootscripts</title>
<para>The <command>/etc/rc.d/init.d/udev</command> initscript takes care of creating
device nodes when Linux is booted. The script unsets the uevent handler
from the default of <command>/sbin/hotplug</command>. This is done
because the kernel no longer needs to call out to an external binary.
Instead <command>udevd</command> will listen on a netlink socket for
uevents that the kernel raises. Next, the bootscript copies any static
device nodes that exist in <filename
<para>The <command>/etc/rc.d/init.d/udev</command> initscript takes care
of creating device nodes when Linux is booted. The script unsets the
uevent handler from the default of <command>/sbin/hotplug</command>.
This is done because the kernel no longer needs to call out to an
external binary. Instead <command>udevd</command> will listen on a
netlink socket for uevents that the kernel raises. Next, the bootscript
copies any static device nodes that exist in <filename
class="directory">/lib/udev/devices</filename> to <filename
class="directory">/dev</filename>. This is necessary because some devices,
directories, and symlinks are needed before the dynamic device handling
processes are available during the early stages of booting a system, or
are required by <command>udevd</command> itself. Creating static device
nodes in <filename class="directory">/lib/udev/devices</filename> also
provides an easy workaround for devices that are not supported by the
dynamic device handling infrastructure. The bootscript then starts the
Udev daemon, <command>udevd</command>, which will act on any uevents it
receives. Finally, the bootscript forces the kernel to replay uevents for
any devices that have already been registered and then waits for
class="directory">/dev</filename>. This is necessary because some
devices, directories, and symlinks are needed before the dynamic device
handling processes are available during the early stages of booting a
system, or are required by <command>udevd</command> itself. Creating
static device nodes in <filename
class="directory">/lib/udev/devices</filename> also provides an easy
workaround for devices that are not supported by the dynamic device
handling infrastructure. The bootscript then starts the Udev daemon,
<command>udevd</command>, which will act on any uevents it receives.
Finally, the bootscript forces the kernel to replay uevents for any
devices that have already been registered and then waits for
<command>udevd</command> to handle them.</para>
<para>The <command>/etc/rc.d/init.d/udev_retry</command> initscript takes
care of re-triggering events for subsystems whose rules may rely on
filesystems that are not mounted until the <command>mountfs</command>
script is run (in particular, /usr and /var may cause this). This script
runs after the <command>mountfs</command> script, so those rules (if
re-triggered) should succeed the second time around. It is configured
from the <filename>/etc/sysconfig/udev_retry</filename> file; any words
in this file other than comments are considered subsystem names to
trigger at retry time. (To find the subsystem of a device, use
<command>udevadm info --attribute-walk</command>.)</para>
</sect3>
<sect3>
<title>Device Node Creation</title>
<para>To obtain the right major and minor number for a device, Udev relies
on the information provided by <systemitem
<para>To obtain the right major and minor number for a device, Udev
relies on the information provided by <systemitem
class="filesystem">sysfs</systemitem> in <filename
class="directory">/sys</filename>. For example,
<filename>/sys/class/tty/vcs/dev</filename> contains the string
<quote>7:0</quote>. This string is used by <command>udevd</command>
to create a device node with major number <emphasis>7</emphasis> and minor
<quote>7:0</quote>. This string is used by <command>udevd</command> to
create a device node with major number <emphasis>7</emphasis> and minor
<emphasis>0</emphasis>. The names and permissions of the nodes created
under the <filename class="directory">/dev</filename> directory are
determined by rules specified in the files within the <filename

4
general.ent
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@ -1,5 +1,5 @@
<!ENTITY version "SVN-20111005">
<!ENTITY releasedate "Oc5 5, 2011">
<!ENTITY version "SVN-20111006">
<!ENTITY releasedate "Oct 6, 2011">
<!ENTITY copyrightdate "1999-2011"><!-- jhalfs needs a literal dash, not &ndash; -->
<!ENTITY milestone "7.0">
<!ENTITY generic-version "development"> <!-- Use "development", "testing", or "x.y[-pre{x}]" -->

2
packages.ent
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@ -298,7 +298,7 @@
<!ENTITY less-ch6-du "3.5 MB">
<!ENTITY less-ch6-sbu "less than 0.1 SBU">
<!ENTITY lfs-bootscripts-version "20110926"> <!-- Scripts depend on this format -->
<!ENTITY lfs-bootscripts-version "20111006"> <!-- Scripts depend on this format -->
<!ENTITY lfs-bootscripts-size "BOOTSCRIPTS-SIZE KB"> <!-- Updated in Makefile -->
<!ENTITY lfs-bootscripts-url "&downloads-root;lfs-bootscripts-&lfs-bootscripts-version;.tar.bz2">
<!ENTITY lfs-bootscripts-md5 "BOOTSCRIPTS-MD5SUM"> <!-- Updated in Makefile -->