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As usual, when the stuff gets in the tree - here is a small
man page update and a TODO line removal.
mention multiple symlinks
update example with silly symlink rule :)
shorten example line to have less than 80 chars
remove "want symlink support" from TODO
* update the Makefiles to autodetect libgcc.a & gcc includes
"ulibc-style". Factorisation of udevdirs & others niceties
* drop a hint about absent /dev/sd? on failed open() for poor Debian
users who don't imagine their favorite distro with only 16 preconfigured
SCSI device nodes :)
Here is a patch to allow the creation of multiple symlinks.
The names must be separated by a space character.
REPLACE, KERNEL="ttyUSB0", NAME="visor", SYMLINK="first-%n second-%n third-%n"
results in:
Dec 9 05:28:51 pim udev[12019]: create_node: mknod(udev-root/visor, 020666, 188, 0)
Dec 9 05:28:51 pim udev[12019]: create_node: symlink 'udev-root/first-0' to node 'visor' requested
Dec 9 05:28:51 pim udev[12019]: create_node: symlink(./visor, udev-root/first-0)
Dec 9 05:28:51 pim udev[12019]: create_node: symlink 'udev-root/second-0' to node 'visor' requested
Dec 9 05:28:51 pim udev[12019]: create_node: symlink(./visor, udev-root/second-0)
Dec 9 05:28:51 pim udev[12019]: create_node: symlink 'udev-root/third-0' to node 'visor' requested
Dec 9 05:28:51 pim udev[12019]: create_node: symlink(./visor, udev-root/third-0)
Attached is a patch against udev-008 to send out a D-BUS message when a
device node is added or removed.
Using D-BUS lingo, udev acquires the org.kernel.udev service and sends
out a NodeCreated or NodeDeleted signal on the
org.kernel.udev.NodeMonitor interface. Each signal carries two
parameters: the node in question and the corresponding sysfs path.
[Note: the D-BUS concepts of service, interface, object can be a bit
confusing at first glance]
An example program listening for these messages looks like this
#!/usr/bin/python
import dbus
import gtk
def udev_signal_received(dbus_iface, member, service, object_path, message):
[filename, sysfs_path] = message.get_args_list()
if member=='NodeCreated':
print 'Node %s created for %s'%(filename, sysfs_path)
elif member=='NodeDeleted':
print 'Node %s deleted for %s'%(filename, sysfs_path)
def main():
bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
bus.add_signal_receiver(udev_signal_received,
'org.kernel.udev.NodeMonitor', # interface
'org.kernel.udev', # service
'/org/kernel/udev/NodeMonitor') # object
gtk.mainloop()
if __name__ == '__main__':
main()
and this is the output when hot-plugging some usb-storage.
[david@laptop udev-008]$ ~/node_monitor.py
Node /udev/sda created for /block/sda
Node /udev/sda1 created for /block/sda/sda1
Node /udev/sda1 deleted for /block/sda/sda1
Node /udev/sda deleted for /block/sda
The patch requires D-BUS 0.20 or later while the python example program
requires D-BUS from CVS as I only recently applied a patch against the
python bindings.
> > here is a experimental symlink creation patch - for discussion,
> > in which direction we should go.
> > It is possible now to define SYMLINK= after the NAME= in udev.rules.
> > The link is relative to the node, but the path is not optimized now
> > if the node and the link are in the same nested directory.
> > Only one link is supported, cause i need to sleep now :)
> >
> > 06-simple-symlink-creation.diff
> > simple symlink creation
> > reorganized udev-remove to have access to the symlink field
> > subdir creation/removal are functions now
> > udev-test.pl tests for link creation/removal
Here is a new version with relative link target path optimization
an better tests in udev-test.pl:
LABEL, BUS="scsi", vendor="IBM-ESXS", NAME="1/2/a/b/node", SYMLINK="1/2/c/d/symlink"
Dec 7 06:48:34 pim udev[13789]: create_node: symlink 'udev-root/1/2/c/d/symlink' to node '1/2/a/b/node' requested
Dec 7 06:48:34 pim udev[13789]: create_path: created 'udev-root/1/2/c'
Dec 7 06:48:34 pim udev[13789]: create_path: created 'udev-root/1/2/c/d'
Dec 7 06:48:34 pim udev[13789]: create_node: symlink(../../a/b/node, udev-root/1/2/c/d/symlink)
Here is an improved version of the patch that enables builds of the extras
progams for the targets all, clean, install, and uninstall, and passes
down the "prefix" for use by install and uninstall.
This patch enables building of the "extras" programs using the same build
environment as udev (i.e. build with udev's versions of klibc and
sysfsutils).
For example, build scsi_id and udev via:
make EXTRAS=extras/scsi_id
Build scsi_id and udev with klibc via:
make KLIBC=true EXTRAS=extras/scsi_id
* implement a reschedule flag in /var/run. Last thing the prog do before
exit is check if a call to multipath was done (but canceled by
/var/run/multipath.run check) during its execution. If so restart the
main loop.
* implement a blacklist of sysfs bdev to not bother with for now (hd,
md, dm, sr, scd, ram, raw). This avoid sending SG_IO to unappropiate
devices.
Compiles & survive "while true;do (./multipath -v &);done"
here is the next update which brings this multipath to the state i'm not
ashamed of it being in udev :)
* drop a libdevmapper copy in extras/multipath; maybe discussions w/
Sistina folks will bring a better solution in the future.
* drop a putchar usage in libdevmapper to compile cleanly with klibc
* drop another such usage of my own in main.c
* massage the Makefile to compile libdevmapper against klibc
* use "ld" to produce the binary rather than "gcc -static"
* stop being stupid w/ uneeded major, minor & dev in main.c:dm_mk_node()
* reverse to creating striped target for now because the multipath
target is more hairy than expected initialy
* push the version code to 009 to be in synch w/ udev
builds & run here.
binary size is 43ko, which is fairly gratifying after all the efforts
I've put to compiling it with klibc :)
I've never seen any project where the documentation is in sync with the
code at this early stage. Nice! So here is the patch to make it extra perfect :)
remove random indent to be consistent
style is "shell style"
s/wildcard/pattern/
mention negation char in character class
While I was adding pattern match to the LABEL method i hit a bug.
We modify a string returned from libsysfs, so with every iteration is is
truncated by one char:
Dec 4 02:27:16 pim udev[23307]: do_label: dev->bus='scsi' sysfs_device->bus='scsi'
Dec 4 02:27:16 pim udev[23307]: do_label: look for device attribute 'vendor'
Dec 4 02:27:16 pim udev[23307]: do_label: xxx 'IBM-ESXS '
Dec 4 02:27:16 pim udev[23307]: do_label: compare attribute 'vendor' value 'IBM-ESX' with '?IBM-ESXS'
Dec 4 02:27:16 pim udev[23307]: do_label: dev->bus='scsi' sysfs_device->bus='scsi'
Dec 4 02:27:16 pim udev[23307]: do_label: look for device attribute 'vendor'
Dec 4 02:27:16 pim udev[23307]: do_label: xxx 'IBM-ESX'
Dec 4 02:27:16 pim udev[23307]: do_label: compare attribute 'vendor' value 'IBM-ES' with 'IBM-ESXS?'
Dec 4 02:27:16 pim udev[23307]: do_label: dev->bus='scsi' sysfs_device->bus='scsi'
Dec 4 02:27:16 pim udev[23307]: do_label: look for device attribute 'vendor'
Dec 4 02:27:16 pim udev[23307]: do_label: xxx 'IBM-ES'
Dec 4 02:27:16 pim udev[23307]: do_label: compare attribute 'vendor' value 'IBM-E' with 'IBM-ES??'
Dec 4 02:27:16 pim udev[23307]: do_label: dev->bus='scsi' sysfs_device->bus='scsi'
Dec 4 02:27:16 pim udev[23307]: do_label: look for device attribute 'vendor'
Dec 4 02:27:16 pim udev[23307]: do_label: xxx 'IBM-E'
Dec 4 02:27:16 pim udev[23307]: do_label: compare attribute 'vendor' value 'IBM-' with 'IBM-ESXSS'
I changed the behavior to remove only the line feed.
03-bug-in-linefeed-removal.diff
remove only the line feed from string not every last char
As promised yesterday, here is a patch to implement a more advanced
pattern matching instead of the simple '*'.
We can remove the "tty"="tty" line from udev.rules now and
replace "tty*" by "tty[0-9]*" to catch only the vc's.
implement pattern matching in namedev
'*' - to match zero or more chars
'?' - to match exactly one char
'[]' - character classes with ranges '[0-9]'and negation [!A]
the older udev.config file is now called udev.rules.
This allows us to better control configuration values, and move away from
the environment variables.
