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- /etc/dev.d/ How it works, and what it is for
-
- by Greg Kroah-Hartman <greg@kroah.com> March 2004
-
-The /etc/dev.d directory works much like the /etc/hotplug.d/ directory
-in that it is a place to put symlinks or programs that get called when
-an event happens in the system. Programs will get called whenever the
-device naming program in the system has either named a new device and
-created a /dev node for it, or when a /dev node has been removed from
-the system due to a device being removed.
-
-The directory tree under /etc/dev.d/ dictate which program is run first,
-and when some programs will be run or not. The device naming program
-calls the programs in the following order:
- /etc/dev.d/DEVNAME/*.dev
- /etc/dev.d/SUBSYSTEM/*.dev
- /etc/dev.d/default/*.dev
-
-The .dev extension is needed to allow automatic package managers to
-deposit backup files in these directories safely.
-
-The DEVNAME name is the name of the /dev file that has been created, or
-for network devices, the name of the newly named network device. This
-value, including the /dev path, will also be exported to userspace in
-the DEVNAME environment variable.
-
-The SUBSYSTEM name is the name of the sysfs subsystem that originally
-generated the hotplug event that caused the device naming program to
-create or remove the /dev node originally. This value is passed to
-userspace as the first argument to the program.
-
-The default directory will always be run, to enable programs to catch
-every device add and remove in a single place.
-
-All environment variables that were originally passed by the hotplug
-call that caused this device action will also be passed to the program
-called in the /etc/dev.d/ directories. Examples of these variables are
-ACTION, DEVPATH, and others. See the hotplug documentation for full
-description of this
-
-An equivalent shell script that would do this same kind of action would
-be:
- DIR="/etc/dev.d"
- export DEVNAME="whatever_dev_name_udev_just_gave"
- for I in "${DIR}/$DEVNAME/"*.dev "${DIR}/$1/"*.dev "${DIR}/default/"*.dev ; do
- if [ -f $I ]; then $I $1 ; fi
- done
- exit 1;
-
-