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Upgrade mdev to allow commands to be run on create/delete.

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Both Jason Schoon and Giuseppe Ciotta deserve credit for this, I used elements
of both.  It's been upgraded so that you can specify that a given command
should run at create, at delete, or at both using different special characters
(@, $, and * respectively).  It uses the system() method of running command
lines which means you can use environment variables on the command line (it
sets $MDEV to the name of the current device being created/deleted, which is
useful if you matched it via regex), and the documentation warns that you need
a /bin/sh to make that work, so you probably want to pick a default shell.
This commit is contained in:
Rob Landley
2006-06-26 14:11:33 +00:00
parent cf7577d417
commit ef10d52745
3 changed files with 130 additions and 105 deletions
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27
util-linux/Config.in
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@@ -265,16 +265,31 @@ config CONFIG_FEATURE_MDEV_CONF
That's device name (with regex match), uid:gid, and permissions.
Optionally, that can be followed (on the same line) by an asterisk
and a command line to run after creating the corresponding device(s),
ala:
hdc root:cdrom 660 *ln -s hdc cdrom
Config file parsing stops on the first matching line. If no config
entry is matched, devices are created with default 0:0 660. (Make
the last line match .* to override this.)
config CONFIG_FEATURE_MDEV_EXEC
bool "Support command execution at device addition/removal"
default n
depends on CONFIG_FEATURE_MDEV_CONF
help
This adds support for an optional field to /etc/mdev.conf, consisting
of a special character and a command line to run after creating the
corresponding device(s) and before removing, ala:
hdc root:cdrom 660 *ln -s $MDEV cdrom
The $MDEV environment variable is set to the name of the device.
The special characters and their meanings are:
@ Run after creating the device.
$ Run before removing the device.
* Run both after creating and before removing the device.
Commands are executed via system() so you need /bin/sh, meaning you
probably want to select a default shell in the Shells menu.
config CONFIG_MKSWAP
bool "mkswap"
default n