mdev: expand --help so that it's actually useful.
function old new delta packed_usage 28634 28822 +188 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
34c469ae04
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5c6ba6c56f
@ -51,8 +51,11 @@ device nodes if your system needs something more than the default root/root
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660 permissions.
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The file has the format:
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<device regex> <uid>:<gid> <permissions>
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or @<maj[,min1[-min2]]> <uid>:<gid> <permissions>
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[-]<device regex> <uid>:<gid> <permissions>
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or
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@<maj[,min1[-min2]]> <uid>:<gid> <permissions>
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or
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$envvar=<regex> <uid>:<gid> <permissions>
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For example:
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hd[a-z][0-9]* 0:3 660
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@ -60,10 +63,13 @@ For example:
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The config file parsing stops at the first matching line. If no line is
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matched, then the default of 0:0 660 is used. To set your own default, simply
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create your own total match like so:
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.* 1:1 777
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You can rename/move device nodes by using the next optional field.
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<device regex> <uid>:<gid> <permissions> [=path]
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So if you want to place the device node into a subdirectory, make sure the path
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has a trailing /. If you want to rename the device node, just place the name.
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hda 0:3 660 =drives/
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@ -239,7 +239,6 @@ IF_MAKEMIME(APPLET(makemime, BB_DIR_BIN, BB_SUID_DROP))
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IF_MAN(APPLET(man, BB_DIR_SBIN, BB_SUID_DROP))
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IF_MATCHPATHCON(APPLET(matchpathcon, BB_DIR_USR_SBIN, BB_SUID_DROP))
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IF_MD5SUM(APPLET_NOEXEC(md5sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, md5sum))
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IF_MDEV(APPLET(mdev, BB_DIR_SBIN, BB_SUID_DROP))
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IF_MICROCOM(APPLET(microcom, BB_DIR_USR_BIN, BB_SUID_DROP))
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IF_MKDIR(APPLET_NOFORK(mkdir, mkdir, BB_DIR_BIN, BB_SUID_DROP, mkdir))
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IF_MKFS_VFAT(APPLET_ODDNAME(mkdosfs, mkfs_vfat, BB_DIR_SBIN, BB_SUID_DROP, mkfs_vfat))
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@ -404,64 +404,6 @@ config LSUSB
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This version uses sysfs (/sys/bus/usb/devices) only.
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config MDEV
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bool "mdev"
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default y
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select PLATFORM_LINUX
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help
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mdev is a mini-udev implementation for dynamically creating device
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nodes in the /dev directory.
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For more information, please see docs/mdev.txt
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config FEATURE_MDEV_CONF
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bool "Support /etc/mdev.conf"
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default y
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depends on MDEV
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help
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Add support for the mdev config file to control ownership and
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permissions of the device nodes.
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For more information, please see docs/mdev.txt
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config FEATURE_MDEV_RENAME
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bool "Support subdirs/symlinks"
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default y
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depends on FEATURE_MDEV_CONF
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help
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Add support for renaming devices and creating symlinks.
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For more information, please see docs/mdev.txt
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config FEATURE_MDEV_RENAME_REGEXP
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bool "Support regular expressions substitutions when renaming device"
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default y
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depends on FEATURE_MDEV_RENAME
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help
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Add support for regular expressions substitutions when renaming
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device.
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config FEATURE_MDEV_EXEC
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bool "Support command execution at device addition/removal"
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default y
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depends on FEATURE_MDEV_CONF
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help
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This adds support for an optional field to /etc/mdev.conf for
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executing commands when devices are created/removed.
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For more information, please see docs/mdev.txt
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config FEATURE_MDEV_LOAD_FIRMWARE
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bool "Support loading of firmwares"
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default y
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depends on MDEV
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help
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Some devices need to load firmware before they can be usable.
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These devices will request userspace look up the files in
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/lib/firmware/ and if it exists, send it to the kernel for
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loading into the hardware.
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config MKSWAP
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bool "mkswap"
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default y
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@ -26,7 +26,6 @@ lib-$(CONFIG_IPCS) += ipcs.o
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lib-$(CONFIG_LOSETUP) += losetup.o
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lib-$(CONFIG_LSPCI) += lspci.o
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lib-$(CONFIG_LSUSB) += lsusb.o
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lib-$(CONFIG_MDEV) += mdev.o
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lib-$(CONFIG_MKFS_EXT2) += mkfs_ext2.o
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lib-$(CONFIG_MKFS_MINIX) += mkfs_minix.o
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lib-$(CONFIG_MKFS_REISER) += mkfs_reiser.o
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@ -8,19 +8,91 @@
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config MDEV
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//config: bool "mdev"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: mdev is a mini-udev implementation for dynamically creating device
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//config: nodes in the /dev directory.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_CONF
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//config: bool "Support /etc/mdev.conf"
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//config: default y
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//config: depends on MDEV
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//config: help
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//config: Add support for the mdev config file to control ownership and
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//config: permissions of the device nodes.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_RENAME
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//config: bool "Support subdirs/symlinks"
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//config: default y
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//config: depends on FEATURE_MDEV_CONF
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//config: help
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//config: Add support for renaming devices and creating symlinks.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_RENAME_REGEXP
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//config: bool "Support regular expressions substitutions when renaming device"
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//config: default y
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//config: depends on FEATURE_MDEV_RENAME
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//config: help
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//config: Add support for regular expressions substitutions when renaming
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//config: device.
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//config:
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//config:config FEATURE_MDEV_EXEC
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//config: bool "Support command execution at device addition/removal"
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//config: default y
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//config: depends on FEATURE_MDEV_CONF
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//config: help
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//config: This adds support for an optional field to /etc/mdev.conf for
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//config: executing commands when devices are created/removed.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_LOAD_FIRMWARE
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//config: bool "Support loading of firmwares"
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//config: default y
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//config: depends on MDEV
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//config: help
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//config: Some devices need to load firmware before they can be usable.
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//config:
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//config: These devices will request userspace look up the files in
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//config: /lib/firmware/ and if it exists, send it to the kernel for
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//config: loading into the hardware.
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//applet:IF_MDEV(APPLET(mdev, BB_DIR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_MDEV) += mdev.o
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//usage:#define mdev_trivial_usage
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//usage: "[-s]"
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//usage:#define mdev_full_usage "\n\n"
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//usage: " -s Scan /sys and populate /dev during system boot\n"
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//usage: "mdev -s is to be run during boot to scan /sys and populate /dev.\n"
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//usage: "\n"
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//usage: "It can be run by kernel as a hotplug helper. To activate it:\n"
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//usage: "Bare mdev is a kernel hotplug helper. To activate it:\n"
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//usage: " echo /sbin/mdev >/proc/sys/kernel/hotplug\n"
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//usage: IF_FEATURE_MDEV_CONF(
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//usage: "\n"
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//usage: "It uses /etc/mdev.conf with lines\n"
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//usage: " [-]DEVNAME UID:GID PERM"
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//usage: IF_FEATURE_MDEV_RENAME(" [>|=PATH]")
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//usage: IF_FEATURE_MDEV_RENAME(" [>|=PATH]|[!]")
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//usage: IF_FEATURE_MDEV_EXEC(" [@|$|*PROG]")
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//usage: "\n"
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//usage: "where DEVNAME is device name regex, @major,minor[-minor2], or\n"
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//usage: "environment variable regex. A common use of the latter is\n"
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//usage: "to load modules for hotplugged devices:\n"
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//usage: " $MODALIAS=.* 0:0 660 @modprobe \"$MODALIAS\"\n"
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//usage: )
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//usage: "\n"
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//usage: "If /dev/mdev.seq file exists, mdev will wait for its value\n"
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//usage: "to match $SEQNUM variable. This prevents plug/unplug races.\n"
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//usage: "To activate this feature, create empty /dev/mdev.seq at boot."
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//usage:
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//usage:#define mdev_notes_usage ""
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//usage: IF_FEATURE_MDEV_CONFIG(
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@ -64,9 +136,9 @@
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* If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
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* /etc/mdev.conf file format:
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*
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* [-][subsystem/]device user:grp mode [>|=path] [@|$|*command args...]
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* [-]@maj,min[-min2] user:grp mode [>|=path] [@|$|*command args...]
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* [-]$envvar=val user:grp mode [>|=path] [@|$|*command args...]
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* [-][subsystem/]device user:grp mode [>|=path]|[!] [@|$|*command args...]
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* [-]@maj,min[-min2] user:grp mode [>|=path]|[!] [@|$|*command args...]
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* [-]$envvar=val user:grp mode [>|=path]|[!] [@|$|*command args...]
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*
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* Leading minus in 1st field means "don't stop on this line", otherwise
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* search is stopped after the matching line is encountered.
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