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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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22
include/usage.h
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@ -1799,19 +1799,25 @@ USE_FEATURE_DATE_ISOFMT( \
"\t-s\tScan /sys and populate /dev during system boot\n\n" \
"Called with no options (via hotplug) it uses environment variables\n" \
"to determine which device to add/remove."
#ifdef CONFIG_FEATURE_MDEV_CONFIG
#define mdev_notes_usage \
#define mdev_notes_usage "" \
USE_FEATURE_MDEV_CONFIG( \
"The mdev config file contains lines that look like:\n" \
" hd[a-z][0-9]* 0:3 660\n\n" \
"That's device name (with regex match), uid:gid, and permissions.\n\n" \
"Optionally, that can be followed (on the same line) by an asterisk\n" \
"and a command line to run after creating the corresponding device(s),\n"\
"ala:\n\n" \
" hdc root:cdrom 660 *ln -s hdc cdrom\n\n" \
USE_FEATURE_MDEV_EXEC( \
"Optionally, that can be followed (on the same line) by a special character\n" \
"and a command line to run after creating/before deleting the corresponding\n" \
"device(s). The environment variable $MDEV indicates the active device node\n" \
"(which is useful if it's a regex match). For example:\n\n" \
" hdc root:cdrom 660 *ln -s $MDEV cdrom\n\n" \
"The special characters are @ (run after creating), $ (run before deleting),\n" \
"and * (run both after creating and before deleting). The commands run in\n" \
"the /dev directory, and use system() which calls /bin/sh.\n\n" \
) \
"Config file parsing stops on the first matching line. If no config\n"\
"entry is matched, devices are created with default 0:0 660. (Make\n"\
"the last line match .* to override this.)\n\n"
#endif
"the last line match .* to override this.)\n\n" \
)
#define mesg_trivial_usage \
"[y|n]"