If linux uses systemd as init, systemd-udevd.service sets MountFlags=slave,
which is essentially a sandboxing setting: it detaches mount() operations
done within the service from the rest of the system. This means that,
outside of namespace of systemd-udev, we can not access device mounted by
udev and some operation may not be possible (e.g. mkfs.ext4 /dev/sda1).
This patch adds systemd-mount in /etc/udev/script/mount.sh. The tool
recommended by systemd upstream generally is the best way in particular in
embedded applications to deal with hotpluggable media. Systemd-mount request
the mount operation to be executed by PID 1, and hence outside of the mount
context of udev.
Signed-off-by: Hongzhi.Song <hongzhi.s...@windriver.com>
---
meta/recipes-core/udev/udev-extraconf/mount.sh | 61 +++++++++++++++++++++++---
1 file changed, 56 insertions(+), 5 deletions(-)
diff --git a/meta/recipes-core/udev/udev-extraconf/mount.sh
b/meta/recipes-core/udev/udev-extraconf/mount.sh
index d760328..2fa2925 100644
--- a/meta/recipes-core/udev/udev-extraconf/mount.sh
+++ b/meta/recipes-core/udev/udev-extraconf/mount.sh
@@ -5,9 +5,28 @@
# Attempt to mount any added block devices and umount any removed devices
-MOUNT="/bin/mount"
+BASE_INIT="`readlink "/sbin/init"`"
+INIT_SYSTEMD="/lib/systemd/systemd"
+
+if [ "x$BASE_INIT" = "x$INIT_SYSTEMD" ];then
+ # systemd as init uses systemd-mount to mount block devices
+ MOUNT="/usr/bin/systemd-mount"
+ UMOUNT="/usr/bin/systemd-umount"
+
+ if [ -x $MOUNT ] && [ -x $UMOUNT ];
+ then
+ logger "Using systemd-mount to finish mount"
+ else
+ logger "Linux init is using systemd, so please install
systemd-mount to finish mount"
+ exit 1
+ fi
+else
+ MOUNT="/bin/mount"
+ UMOUNT="/bin/umount"
+fi
+
PMOUNT="/usr/bin/pmount"
-UMOUNT="/bin/umount"
+
for line in `grep -h -v ^# /etc/udev/mount.blacklist
/etc/udev/mount.blacklist.d/*`
do
if [ ` expr match "$DEVNAME" "$line" ` -gt 0 ];
@@ -17,6 +36,34 @@ do
fi
done
+automount_systemd() {
+ name="`basename "$DEVNAME"`"
+
+ ! test -d "/run/media/$name" && mkdir -p "/run/media/$name"
+
+ MOUNT="$MOUNT -o silent"
+
+ # If filesystemtype is vfat, change the ownership group to 'disk', and
+ # grant it with w/r/x permissions.
+ case $ID_FS_TYPE in
+ vfat|fat)
+ MOUNT="$MOUNT -o umask=007,gid=`awk -F':' '/^disk/{print $3}'
/etc/group`"
+ ;;
+ # TODO
+ *)
+ ;;
+ esac
+
+ if ! $MOUNT --no-block -t auto $DEVNAME "/run/media/$name"
+ then
+ #logger "mount.sh/automount" "$MOUNT -t auto $DEVNAME
\"/run/media/$name\" failed!"
+ rm_dir "/run/media/$name"
+ else
+ logger "mount.sh/automount" "Auto-mount of [/run/media/$name]
successful"
+ touch "/tmp/.automount-$name"
+ fi
+}
+
automount() {
name="`basename "$DEVNAME"`"
@@ -72,9 +119,13 @@ if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ] && [ -n
"$ID_FS_TYPE" -o "$media_t
# If the device isn't mounted at this point, it isn't
# configured in fstab (note the root filesystem can show up as
# /dev/root in /proc/mounts, so check the device number too)
- if expr $MAJOR "*" 256 + $MINOR != `stat -c %d /`; then
- grep -q "^$DEVNAME " /proc/mounts || automount
- fi
+ if expr $MAJOR "*" 256 + $MINOR != `stat -c %d /`; then
+ if [ "`basename $MOUNT`" = "systemd-mount" ];then
+ grep -q "^$DEVNAME " /proc/mounts || automount_systemd
+ else
+ grep -q "^$DEVNAME " /proc/mounts || automount
+ fi
+ fi
fi
--
2.8.1
--
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