1 files changed, 21 insertions, 6 deletions

diff --git a/util-linux/Config.in b/util-linux/Config.in
index a493fbfb4..501ed6bfc 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -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