Automatically mount removable media - Revision history

JulienB: /* Default case */

2014-09-17T18:43:57Z

Default case

← Older revision		Revision as of 20:43, 17 September 2014
Line 1:		Line 1:
	When using USB key or MMC/SD in a final application, it could be useful if these media were automatically mount when inserted by the user. We will explain you how to implement this behaviour in this tutorial.		When using USB key or MMC/SD in a final application, it could be useful if these media were automatically mount when inserted by the user. We will explain you how to implement this behaviour in this tutorial.

	==Default case==		==Default case (mdev)==
	* If you are using default armadeus rootfs, hotplugging is handled by an application called ''mdev''. This can be easily checked with:		* If you are using default armadeus rootfs, hotplugging is handled by an application called ''mdev''. This can be easily checked with:
	<pre class="apf">		<pre class="apf">

JulienB: /* Default case */

2014-09-17T18:42:57Z

Default case

← Older revision		Revision as of 20:42, 17 September 2014
Line 69:		Line 69:
	</pre>		</pre>

	* As we now use /media to create dynamic mount points we will move it from FLASH to RAM by using a tmpfs mount. Take your favorite ~~editro~~ again and edit /etc/fstab file to add it the following line ~~at the end~~:		* As we now use ''/media'' to create dynamic mount points we will move it from FLASH to RAM by using a tmpfs mount. Take your favorite editor again and edit ''/etc/fstab'' file to add it the following line:
	<source lang="diff">		<source lang="diff">
	...		...
Line 76:		Line 76:
	</source>		</source>
	:		:
	* ~~then~~ reboot and everything should now work :-). For example when plugging a MMC/SD you will get:		* Then, reboot and everything should now work :-). For example when plugging a MMC/SD you will get:
	<pre class="apf">		<pre class="apf">
	# mmc0: host does not support reading read-only switch. assuming write-enable.		# mmc0: host does not support reading read-only switch. assuming write-enable.
Line 94:		Line 94:
	</pre>		</pre>

	* Don't forget that if you want to remove your device, you will have to manually umount it before:		* Don't forget that if you want to remove your device, you will have to manually umount it before. Example for a MMC/SD:
	<pre class="apf">		<pre class="apf">
	# umount /media/mmcblk0p1		# umount /media/mmcblk0p1

JulienB: /* Default case */

2014-09-17T16:58:26Z

Default case

← Older revision		Revision as of 18:58, 17 September 2014
Line 20:		Line 20:

	</source>		</source>
	* this way mdev will call a script named ''/lib/mdev/automount.sh'' each time a USB drive or an MMC/SD, with a recognized partition table, is plugged in.		* this way ''mdev'' will call a script named ''/lib/mdev/automount.sh'' each time a USB drive or an MMC/SD (with a recognized partition table) is plugged in.
	* create directory ''/lib/mdev''		* create directory ''/lib/mdev''
	<pre class="apf">		<pre class="apf">

JulienB at 12:16, 17 February 2012

2012-02-17T12:16:23Z

← Older revision		Revision as of 14:16, 17 February 2012
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	+sd[a-z] 0:6 660		+sd[a-z] 0:6 660
	+mmcblk[0-9] 0:6 660		+mmcblk[0-9] 0:6 660
	+sd[a-z][0-9] 0:6 660 */~~etc~~/~~hotplug~~/automounter.sh		+sd[a-z][0-9] 0:6 660 */lib/mdev/automounter.sh
	+mmcblk[0-9]p[0-9] 0:6 660 */~~etc~~/~~hotplug~~/automounter.sh		+mmcblk[0-9]p[0-9] 0:6 660 */lib/mdev/automounter.sh

	</source>		</source>
	* this way mdev will call a script named ''/~~etc~~/~~hotplug~~/automount.sh'' each time a USB drive or an MMC/SD, with a recognized partition table, is plugged in.		* this way mdev will call a script named ''/lib/mdev/automount.sh'' each time a USB drive or an MMC/SD, with a recognized partition table, is plugged in.
	* create directory ''/~~etc~~/~~hotplug~~''		* create directory ''/lib/mdev''
	<pre class="apf">		<pre class="apf">
	# mkdir /~~etc~~/~~hotplug~~		# mkdir /lib/mdev
	</pre>		</pre>
	*then we will have to write what this script is going to do. So take your favorite editor and fill ''/~~etc~~/~~hotplug~~/automounter.sh'' with:		*then we will have to write what this script is going to do. So take your favorite editor and fill ''/lib/mdev/automounter.sh'' with:
	<pre class="apf">		<pre class="apf">
	# vi /~~etc~~/~~hotplug~~/automounter.sh		# vi /lib/mdev/automounter.sh
	</pre>		</pre>

Line 66:		Line 66:
	</source>		</source>
	<pre class="apf">		<pre class="apf">
	# chmod a+x /~~etc~~/~~hotplug~~/automounter.sh		# chmod a+x /lib/mdev/automounter.sh
	</pre>		</pre>

JulienB: /* Other cases */

2012-02-16T18:47:35Z

Other cases

← Older revision		Revision as of 20:47, 16 February 2012
Line 101:		Line 101:
	==Other cases==		==Other cases==
	* well... in that cases I suppose you know what you're doing !:-)		* well... in that cases I suppose you know what you're doing !:-)
	* if using udev instead of mdev for example, then you will have to activate ~~correspondign~~ Buildroot packages (eg usbmount)		* if using udev instead of mdev for example, then you will have to activate corresponding Buildroot packages (eg usbmount)

	==Links==		==Links==
	* http://lists.busybox.net/pipermail/buildroot/2011-August/045187.html		* http://lists.busybox.net/pipermail/buildroot/2011-August/045187.html
	* http://linux.die.net/man/8/hotplug		* http://linux.die.net/man/8/hotplug

JulienB: /* Links */

2012-02-16T18:46:24Z

Links

← Older revision		Revision as of 20:46, 16 February 2012
Line 105:		Line 105:
	==Links==		==Links==
	* http://lists.busybox.net/pipermail/buildroot/2011-August/045187.html		* http://lists.busybox.net/pipermail/buildroot/2011-August/045187.html
			* http://linux.die.net/man/8/hotplug

JulienB: /* Default case */

2012-02-16T18:40:25Z

Default case

← Older revision		Revision as of 20:40, 16 February 2012
Line 8:		Line 8:
	</pre>		</pre>

	* It means that each time Linux kernel detect a new device it will call ''/sbin/mdev'' program with specific ~~paramaeters~~.		* It means that each time Linux kernel detect a new device it will call ''/sbin/mdev'' program with specific parameters.
	* You can configure mdev with its config file: ''/etc/mdev.conf''. To add automatic mount of USB and SD/MMC devices you can apply the following changes (- -> remove line, + -> add line) in the configuration file:		* You can configure mdev with its config file: ''/etc/mdev.conf''. To add automatic mount of USB and SD/MMC devices you can apply the following changes (- -> remove line, + -> add line) in the configuration file:
	<source lang="diff">		<source lang="diff">
Line 14:		Line 14:
	-sd[a-z].* 0:6 660		-sd[a-z].* 0:6 660
	-mmcblk[0-9].* 0:6 660		-mmcblk[0-9].* 0:6 660
	+sd[a-z]* 0:6 660		+sd[a-z] 0:6 660
	+mmcblk[0-9]* 0:6 660		+mmcblk[0-9] 0:6 660
	+sd[a-z][0-9] 0:6 660 */etc/hotplug/automounter.sh		+sd[a-z][0-9] 0:6 660 */etc/hotplug/automounter.sh
	+mmcblk[0-9]p[0-9] 0:6 660 */etc/hotplug/automounter.sh		+mmcblk[0-9]p[0-9] 0:6 660 */etc/hotplug/automounter.sh

	</source>		</source>
	* this way mdev will ~~called~~ a script named ''/etc/hotplug/automount.sh'' each time a USB drive or an MMC/SD ~~is plugged~~ with a ~~recognised~~ partition table is plugged in.		* this way mdev will call a script named ''/etc/hotplug/automount.sh'' each time a USB drive or an MMC/SD, with a recognized partition table, is plugged in.
	* ~~Now we have to write what this script will have to do. So take your favorite editor and fill~~ ''/etc/hotplug~~/automounter.sh~~'' ~~with:~~		* create directory ''/etc/hotplug''
	<pre class="apf">		<pre class="apf">
	mkdir /etc/hotplug		# mkdir /etc/hotplug
	vi /etc/hotplug/automounter.sh		</pre>
			*then we will have to write what this script is going to do. So take your favorite editor and fill ''/etc/hotplug/automounter.sh'' with:
			<pre class="apf">
			# vi /etc/hotplug/automounter.sh
	</pre>		</pre>

Line 32:		Line 35:
	destdir=/media		destdir=/media

	~~eumount~~()		my_umount()
	{		{
	if grep -qs "^/dev/$1 " /proc/mounts ; then		if grep -qs "^/dev/$1 " /proc/mounts ; then
Line 41:		Line 44:
	}		}

	~~emount~~()		my_mount()
	{		{
	mkdir -p "${destdir}/$1" \|\| exit 1		mkdir -p "${destdir}/$1" \|\| exit 1
Line 54:		Line 57:
	case "${ACTION}" in		case "${ACTION}" in
	add\|"")		add\|"")
	~~eumount~~ ${MDEV}		my_umount ${MDEV}
	~~emount~~ ${MDEV}		my_mount ${MDEV}
	;;		;;
	remove)		remove)
	~~eumount~~ ${MDEV}		my_umount ${MDEV}
	;;		;;
	esac		esac
Line 64:		Line 67:
	<pre class="apf">		<pre class="apf">
	# chmod a+x /etc/hotplug/automounter.sh		# chmod a+x /etc/hotplug/automounter.sh
	~~# reboot~~
	</pre>		</pre>

Line 91:		Line 93:
	/dev/mmcblk0p1 on /media/mmcblk0p1 type vfat (rw,sync,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1)		/dev/mmcblk0p1 on /media/mmcblk0p1 type vfat (rw,sync,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1)
	</pre>		</pre>

			* Don't forget that if you want to remove your device, you will have to manually umount it before:
			<pre class="apf">
			# umount /media/mmcblk0p1
			</pre>

			==Other cases==
			* well... in that cases I suppose you know what you're doing !:-)
			* if using udev instead of mdev for example, then you will have to activate correspondign Buildroot packages (eg usbmount)

	==Links==		==Links==
	* http://lists.busybox.net/pipermail/buildroot/2011-August/045187.html		* http://lists.busybox.net/pipermail/buildroot/2011-August/045187.html

JulienB: /* Default case */

2012-02-16T18:27:27Z

Default case

← Older revision		Revision as of 20:27, 16 February 2012
Line 2:		Line 2:

	==Default case==		==Default case==
	* ~~You~~ are using default armadeus rootfs ~~and so~~ hotplugging is handled by an application called ''mdev''. This can be easily checked with:		* If you are using default armadeus rootfs, hotplugging is handled by an application called ''mdev''. This can be easily checked with:
	<pre class="apf">		<pre class="apf">
	# cat /proc/sys/kernel/hotplug		# cat /proc/sys/kernel/hotplug

JulienB: /* Default case */

2012-02-16T18:26:41Z

Default case

@@ Line 65: / Line 65: @@
 # chmod a+x /etc/hotplug/automounter.sh
 # reboot
 </pre>
 ==Links==
 * http://lists.busybox.net/pipermail/buildroot/2011-August/045187.html

JulienB: /* Default case */

2012-02-16T18:05:05Z

Default case

← Older revision		Revision as of 20:05, 16 February 2012
Line 9:		Line 9:

	* It means that each time Linux kernel detect a new device it will call ''/sbin/mdev'' program with specific paramaeters.		* It means that each time Linux kernel detect a new device it will call ''/sbin/mdev'' program with specific paramaeters.
	* You can configure mdev with ''/etc/mdev.conf''. To add automatic mount of USB and SD/MMC devices you can apply the following changes in the configuration file:		* You can configure mdev with its config file: ''/etc/mdev.conf''. To add automatic mount of USB and SD/MMC devices you can apply the following changes (- -> remove line, + -> add line) in the configuration file:
	<source lang="~~bash~~">		<source lang="diff">
	# Block devices		# Block devices
	-sd[a-z]* 0:6 660		-sd[a-z].* 0:6 660
	-mmcblk[0-9]p* 0:6 660		-mmcblk[0-9].* 0:6 660
	+sd[a-z]* 0:6 660 */etc/hotplug/automounter.sh		+sd[a-z]* 0:6 660
	+mmcblk[0-9]p* 0:6 660 */etc/hotplug/automounter.sh		+mmcblk[0-9]* 0:6 660
			+sd[a-z][0-9] 0:6 660 */etc/hotplug/automounter.sh
			+mmcblk[0-9]p[0-9] 0:6 660 */etc/hotplug/automounter.sh

	</source>		</source>
	* this way mdev will called a script named ''/etc/hotplug/automount.sh'' each time a USB drive or an MMC/SD is plugged in		* this way mdev will called a script named ''/etc/hotplug/automount.sh'' each time a USB drive or an MMC/SD is plugged with a recognised partition table is plugged in.
	* Now we have to write what this script will have to do. So take your favorite editor and fill ''/etc/hotplug/~~automount~~.sh'' with:		* Now we have to write what this script will have to do. So take your favorite editor and fill ''/etc/hotplug/automounter.sh'' with:
	<pre class="apf">		<pre class="apf">
	mkdir /etc/hotplug		mkdir /etc/hotplug