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update README

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Kay Sievers 2006-04-02 16:01:00 +02:00
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13
FAQ
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@ -84,7 +84,7 @@ A: udev can be placed in initramfs and run for every device that is found.
Q: Can I use udev to automount a USB device when I connect it?
A: Technically, yes, but udev is not intended for this. All major distributions
use HAL (http://freedesktop.org/wiki/Software_2fhal) for this, which also
watches devices with removable media and integrates into the desktop software.
watches devices with removable media and integrates the Desktop environment.
Alternatively, it is easy to add the following to fstab:
/dev/disk/by-label/PENDRIVE /media/PENDRIVE vfat user,noauto 0 0
@ -106,13 +106,12 @@ A: When using dynamic device numbers, a given pair of major/minor numbers may
(The same problem exists when using PAM to change permissions on login.)
The simplest solution is to prevent the creation of hard links by putting
/dev in a separate filesystem like tmpfs.
/dev on a separate filesystem like tmpfs.
Q: I have other questions about udev, where do I ask them?
A: The linux-hotplug-devel mailing list is the proper place for it. The
address for it is linux-hotplug-devel@lists.sourceforge.net
Information on joining can be found at
<https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel>
Archives of the mailing list can be found at:
<http://marc.theaimsgroup.com/?l=linux-hotplug-devel>
address for it is:
linux-hotplug-devel@lists.sourceforge.net
Information on joining can be found at:
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel

45
README
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@ -4,13 +4,12 @@ For more information see the files in the docs/ directory.
Important Note:
Integrating udev in the system is a whole lot of work, has complex dependencies
and differs a lot from distro to distro. All reasonable distros depend on udev
these days and the system will not work without it.
The upstream udev project does not support or recomend to replace a distro's udev
installation with the upstream version. The installation of a unmodified upstream
version may render your system unusable! There is no "default" setup or a set
of "default" rules provided by the upstream udev version.
and differs a lot from distro to distro. All major distros depend on udev these
days and the system may not work without a proper installed version. The upstream
udev project does not support or recomend to replace a distro's udev installation
with the upstream version. The installation of a unmodified upstream version may
render your system unusable. Until now, there is no "default" setup or a set of
"default" rules provided by the upstream udev version.
Requirements:
- 2.6.x version of the Linux kernel. See the RELEASE-NOTES file in the
@ -19,7 +18,7 @@ Requirements:
- The kernel must have sysfs and unix domain socket enabled.
(unix domain sockets (CONFIG_UNIX) as a loadable kernel module may work,
but it is completely silly, don't complain if anything goes wrong.)
but it is completely silly - don't complain if anything goes wrong.)
- The proc filesystem must be mounted on /proc.
@ -31,9 +30,9 @@ Operation:
Udev creates and removes device nodes in /dev, based on events the kernel
sends out on device discovery or removal.
- Early in the boot process, /dev should get a tmpfs filesystem
mounted, which is populated from scratch by udev. Created nodes or
changed permissions will not survive a reboot, which is intentional.
- Early in the boot process, the /dev directory should get a tmpfs
filesystem mounted, which is populated from scratch by udev. Created nodes
or changed permissions will not survive a reboot, which is intentional.
- The content of /lib/udev/devices directory which contains the nodes,
symlinks and directories, which are always expected to be in /dev, should
@ -50,8 +49,9 @@ Operation:
- All kernel events are matched against a set of specified rules in
/etc/udev/rules.d/ which make it possible to hook into the event
processing to load required kernel modules and setup devices. For all
devices the kernel requests a device node, udev will create one with
the default name or the one specified by a matching udev rules.
devices the kernel exports a major/minor number, udev will create a
device node with the default kernel name or the one specified by a
matching udev rule.
Compile Options:
@ -74,16 +74,13 @@ Compile Options:
Default value is 'false'. KLCC specifies the klibc compiler
wrapper, usually located at /usr/bin/klcc.
EXTRAS
If set, will build the "extra" helper programs as specified
as listed (see below for an example).
If you want to build the udev helper programs:
make EXTRAS="extras/cdrom_id extras/scsi_id extras/volume_id"
list of helper programs in extras/ to build.
make EXTRAS="extras/cdrom_id extras/scsi_id extras/volume_id"
Installation:
- The install target intalls the udev binaries in the default locations,
All at boot time reqired binaries will be installed in /sbin.
All at boot time reqired binaries will be installed in /lib/udev or /sbin.
- The default location for scripts and binaries that are called from
rules is /lib/udev. Other packages who install udev rules, should use
@ -94,12 +91,12 @@ Installation:
That way, nodes for broken subsystems or devices which can't be
detected automatically by the kernel, will always be available.
- Copies of the rules files for all major distros are in the etc/udev
directory (you may look there how others distros are doing it).
- Copies of the rules files for the major distros are provided as examples
in the etc/udev directory.
- The persistent disk links in /dev/disk are the de facto standard
on Linux and should be installed with every default udev installation.
The devfs naming scheme rules are not recommended and not supported.
- The persistent device naming links in /dev/disk/ are required by other
software that depends on the data udev has collected from the devices
and should be installed by default with every udev installation.
Please direct any comment/question/concern to the linux-hotplug-devel mailing list at:
linux-hotplug-devel@lists.sourceforge.net