Upon inserting a USB stick or similar device, mdev will run an automounter script that mounts valid partitions on /media/<device>. The script first checks /etc/fstab entries so that mounting on UUID or LABEL or using custom mount options is still possible. If /etc/fstab does not contain particular mount options, the script will create (and remove) the mountpoint automatically. The script also supports full disk partitions (devices without partition table).
The automatic mounting can be disabled by adding a line MDEV_AUTOMOUNT=y into /etc/default/mdev Automatic mounting for a particular device can be disabled by creating a file "/dev/<device>.nomount". This is helpful in scripts that create partitions for example, and want to perform specific actions which require the device to remain unmounted. A more complex variation (using LABEL based mounts) on this script has been in use in OpenPLi for many years now, and I've used this one on many projects already, so it's about time to push this to mainline. Signed-off-by: Mike Looijmans <mike.looijm...@topic.nl> --- meta/recipes-core/busybox/busybox.inc | 1 + meta/recipes-core/busybox/busybox_1.22.1.bb | 1 + meta/recipes-core/busybox/busybox_git.bb | 1 + meta/recipes-core/busybox/files/mdev-mount.sh | 62 +++++++++++++++++++++++++ meta/recipes-core/busybox/files/mdev.conf | 3 ++ 5 files changed, 68 insertions(+) create mode 100644 meta/recipes-core/busybox/files/mdev-mount.sh diff --git a/meta/recipes-core/busybox/busybox.inc b/meta/recipes-core/busybox/busybox.inc index deb2ee4..0769d92 100644 --- a/meta/recipes-core/busybox/busybox.inc +++ b/meta/recipes-core/busybox/busybox.inc @@ -270,6 +270,7 @@ do_install () { install -m 644 ${WORKDIR}/mdev.conf ${D}${sysconfdir}/mdev.conf install -d ${D}${sysconfdir}/mdev install -m 0755 ${WORKDIR}/find-touchscreen.sh ${D}${sysconfdir}/mdev + install -m 0755 ${WORKDIR}/mdev-mount.sh ${D}${sysconfdir}/mdev fi fi diff --git a/meta/recipes-core/busybox/busybox_1.22.1.bb b/meta/recipes-core/busybox/busybox_1.22.1.bb index 82f7f68..f379bb6 100644 --- a/meta/recipes-core/busybox/busybox_1.22.1.bb +++ b/meta/recipes-core/busybox/busybox_1.22.1.bb @@ -20,6 +20,7 @@ SRC_URI = "http://www.busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \ file://busybox-syslog.default \ file://mdev \ file://mdev.conf \ + file://mdev-mount.sh \ file://umount.busybox \ file://defconfig \ file://busybox-syslog.service.in \ diff --git a/meta/recipes-core/busybox/busybox_git.bb b/meta/recipes-core/busybox/busybox_git.bb index f2cc119..f91b552 100644 --- a/meta/recipes-core/busybox/busybox_git.bb +++ b/meta/recipes-core/busybox/busybox_git.bb @@ -24,6 +24,7 @@ SRC_URI = "git://busybox.net/busybox.git \ file://busybox-syslog.default \ file://mdev \ file://mdev.conf \ + file://mdev-mount.sh \ file://umount.busybox \ file://defconfig \ file://busybox-syslog.service.in \ diff --git a/meta/recipes-core/busybox/files/mdev-mount.sh b/meta/recipes-core/busybox/files/mdev-mount.sh new file mode 100644 index 0000000..60ecf88 --- /dev/null +++ b/meta/recipes-core/busybox/files/mdev-mount.sh @@ -0,0 +1,62 @@ +#!/bin/sh +MDEV_AUTOMOUNT=y +[ -f /etc/default/mdev ] && . /etc/default/mdev +if [ "${MDEV_AUTOMOUNT}" = "n" ] ; then + exit 0 +fi + +case "$ACTION" in + add|"") + ACTION="add" + # check if already mounted + if grep -q "^/dev/${MDEV} " /proc/mounts ; then + # Already mounted + exit 0 + fi + DEVBASE=`expr substr $MDEV 1 3` + if [ "${DEVBASE}" == "mmc" ] ; then + DEVBASE=`expr substr $MDEV 1 7` + fi + # check for "please don't mount it" file + if [ -f "/dev/nomount.${DEVBASE}" ] ; then + # blocked + exit 0 + fi + # check for full-disk partition + if [ "${DEVBASE}" == "${MDEV}" ] ; then + if [ -d /sys/block/${DEVBASE}/${DEVBASE}*1 ] ; then + # Partition detected, just quit + exit 0 + fi + if [ ! -f /sys/block/${DEVBASE}/size ] ; then + # No size at all + exit 0 + fi + if [ `cat /sys/block/${DEVBASE}/size` == 0 ] ; then + # empty device, bail out + exit 0 + fi + fi + # first allow fstab to determine the mountpoint + if ! mount /dev/$MDEV > /dev/null 2>&1 + then + MOUNTPOINT="/media/$MDEV" + mkdir "$MOUNTPOINT" + mount -t auto /dev/$MDEV "$MOUNTPOINT" + fi + ;; + remove) + MOUNTPOINT=`grep "^/dev/$MDEV\s" /proc/mounts | cut -d' ' -f 2` + if [ ! -z "$MOUNTPOINT" ] + then + umount "$MOUNTPOINT" + rmdir "$MOUNTPOINT" + else + umount /dev/$MDEV + fi + ;; + *) + # Unexpected keyword + exit 1 + ;; +esac diff --git a/meta/recipes-core/busybox/files/mdev.conf b/meta/recipes-core/busybox/files/mdev.conf index e688911..c83bb4c 100644 --- a/meta/recipes-core/busybox/files/mdev.conf +++ b/meta/recipes-core/busybox/files/mdev.conf @@ -35,3 +35,6 @@ input/mice 0:0 0660 input/mouse.* 0:0 0660 tun[0-9]* 0:0 0660 =net/ + +[hs]d[a-z][0-9]? 0:0 660 */etc/mdev/mdev-mount.sh +mmcblk[0-9].* 0:0 660 */etc/mdev/mdev-mount.sh -- 1.7.9.5 -- _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-core