[PATCH] udev - drop all methods :)

[PATCH] udev - drop all methods :)

> Hi,
> as promised yesterday, here is a patch that drops the explicit methods
> given in the udev config and implement only one type of rule.
>
> A rule now consists only of a number of keys to match. All known keys
> are valid in any combination. The former configs should work with a few
> changes:
>
>   o the "<METHOD>, " at the beginning of the line should be removed
>
>   o the result of the externel program is matched with RESULT= instead if ID=
>     the PROGRAM= key is only valid if the program exits with zero
>     (just exit with nozero in a script if the rule should not match)
>
>   o rules are processed in order they appear in the file, no priority
>
>   o if NAME="" is given, udev is instructed to ignore this device,
>     no node will be created
>
>
>   EXAMPLE:
>
>   # combined BUS, SYSFS and KERNEL
>   BUS="usb", KERNEL="video*", SYSFS_model="Creative Labs WebCam*", NAME="test/webcam%n"
>
>   # exec script only for the first ide drive (hda), all other will be skipped
>   BUS="ide", KERNEL="hda*", PROGRAM="/home/kay/src/udev.kay/extras/ide-devfs.sh %k %b %n", RESULT="hd*", NAME="%1c", SYMLINK="%2c %3c"
>
>
> The udev-test.pl and test.block works fine here.
> Please adapt your config and give it a try.
>

Here is a slightly better version of the patch.
After a conversation with Patrick, we are now able to execute the PROGRAM
and also match in all following rules with the RESULT value from this exec.

EXAMPLE:
  We have 7 rules with RESULT and 2 with PROGRAM.
  Only the 5th rule matches with the callout result from the exec in the 4th rule.

RULES:
  PROGRAM="/bin/echo abc", RESULT="no_match", NAME="web-no-2"
  KERNEL="video*", RESULT="123", NAME="web-no-3"
  KERNEL="video*", RESULT="123", NAME="web-no-4"
  PROGRAM="/bin/echo 123", RESULT="no_match", NAME="web-no-5"
  KERNEL="video*", RESULT="123", NAME="web-yes"

RESULT:
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check PROGRAM
  Jan 11 23:36:52 pim udev[26050]: execute_program: executing '/bin/echo abc'
  Jan 11 23:36:52 pim udev[26050]: execute_program: result is 'abc'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: PROGRAM returned successful
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='no_match', udev->program_result='abc'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for KERNEL dev->kernel='video*' class_dev->name='video0'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: KERNEL matches
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='123', udev->program_result='abc'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for KERNEL dev->kernel='video*' class_dev->name='video0'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: KERNEL matches
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='123', udev->program_result='abc'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check PROGRAM
  Jan 11 23:36:52 pim udev[26050]: execute_program: executing '/bin/echo 123'
  Jan 11 23:36:52 pim udev[26050]: execute_program: result is '123'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: PROGRAM returned successful
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='no_match', udev->program_result='123'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for KERNEL dev->kernel='video*' class_dev->name='video0'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: KERNEL matches
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='123', udev->program_result='123'
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT matches
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: found matching rule, 'video*' becomes ''
  Jan 11 23:36:52 pim udev[26050]: namedev_name_device: name, 'web-yes' is going to have owner='', group='', mode = 0600