udev rules aren't being run

Hi Mike,

I will ask somebody from the SW team to look at this.

Mike,

The AMSDK filesystem has such udev rule for block device automount, /etc/udev/rules.d/automount.rules. Please use it as a reference.

First please ensure the USB works. For example, run 'lsusb' command after plugged in the USB device to see if the device is enumerated.

Bin Liu,

   I did verify that the USB enumerated correctly:

before usb is inserted:

[root /var]# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

after usb is inserted:

[root /var]# lsusb
Bus 001 Device 015: ID 154b:005b PNY
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

So you can see my "PNY" usb stick was found and enumerated correctly. I did see the automount rules in /etc/udev/rules.d however my script being named "01..." should have run first since the udev rules are sorted numerically/alphabetically. I think both scripts should run anyway. That's how it works on my Ubuntu development machine anyway.

Mike,

I just ran a test with an EVM using SDK 7.00.  I plugged in a USB device and saw it automatically mount at /var/volatile/run/media/sda1.

It looks like the main files controlling this are:

/etc/udev/rules.d/automount.rules said:

# There are a number of modifiers that are allowed to be used in some
# of the different fields. They provide the following subsitutions:
#
# %n the "kernel number" of the device.
#    For example, 'sda3' has a "kernel number" of '3'
# %e the smallest number for that name which does not matches an existing node
# %k the kernel name for the device
# %M the kernel major number for the device
# %m the kernel minor number for the device
# %b the bus id for the device
# %c the string returned by the PROGRAM
# %s{filename} the content of a sysfs attribute
# %% the '%' char itself
#

# Media automounting
SUBSYSTEM=="block", ACTION=="add"    RUN+="/etc/udev/scripts/mount.sh"
SUBSYSTEM=="block", ACTION=="remove" RUN+="/etc/udev/scripts/mount.sh"

And the corresponding script it invokes (watch permissions when creating the script!):

/etc/udev/scripts/mount.sh said:

#!/bin/sh
#
# Called from udev
#
# Attempt to mount any added block devices and umount any removed devices


MOUNT="/bin/mount"
PMOUNT="/usr/bin/pmount"
UMOUNT="/bin/umount"
for line in `grep -v ^# /etc/udev/mount.blacklist`
do
        if [ ` expr match "$DEVNAME" "$line" ` -gt 0 ];
        then
                logger "udev/mount.sh" "[$DEVNAME] is blacklisted, ignoring"
                exit 0
        fi
done

automount() {
        name="`basename "$DEVNAME"`"

        ! test -d "/run/media/$name" && mkdir -p "/run/media/$name"
        # Silent util-linux's version of mounting auto
        if [ "x`readlink $MOUNT`" = "x/bin/mount.util-linux" ] ;
        then
                MOUNT="$MOUNT -o silent"
        fi

        if ! $MOUNT -t auto $DEVNAME "/run/media/$name"
        then
                #logger "mount.sh/automount" "$MOUNT -t auto $DEVNAME \"/run/med
ia/$name\" failed!"
                rm_dir "/run/media/$name"
        else
                logger "mount.sh/automount" "Auto-mount of [/run/media/$name] su
ccessful"
                touch "/tmp/.automount-$name"
        fi
}

rm_dir() {
        # We do not want to rm -r populated directories
        if test "`find "$1" | wc -l | tr -d " "`" -lt 2 -a -d "$1"
        then
                ! test -z "$1" && rm -r "$1"
        else
                logger "mount.sh/automount" "Not removing non-empty directory [$
1]"
        fi
}

if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ] && [ -n "$ID_FS_TYPE" ]; then
        if [ -x "$PMOUNT" ]; then
                $PMOUNT $DEVNAME 2> /dev/null
        elif [ -x $MOUNT ]; then
                $MOUNT $DEVNAME 2> /dev/null
        fi

        # 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
fi



if [ "$ACTION" = "remove" ] && [ -x "$UMOUNT" ] && [ -n "$DEVNAME" ]; then
        for mnt in `cat /proc/mounts | grep "$DEVNAME" | cut -f 2 -d " " `
        do
                $UMOUNT $mnt
        done

        # Remove empty directories from auto-mounter
        name="`basename "$DEVNAME"`"
        test -e "/tmp/.automount-$name" && rm_dir "/run/media/$name"
fi

Brad, I've got the same scripts in the same locations, but they don't seem to be doing anything:

[root /var/volatile/run]# ls
dbus           ifstate        sshd           syslog-ng.pid  xinetd.pid
fbmgr.pid      snmpd.pid      sshd.pid       uim2.pid
[root /var/volatile/run]# lsusb
Bus 001 Device 002: ID 154b:005b PNY
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

There is no media directroy created under /var/volatile/run so the USB drive doesn't auto mount. That's why I'm thinking that udev rules aren't working for some reason.

Make sure your script is executable in the file system.  The script creates the mount directory using "mkdir -p" so it should be creating all the directories it needs (even media).

I checked and the script is executable:


[root /etc/udev]# ls
cache.data       rules.d          udev.conf
mount.blacklist  scripts
[root /etc/udev]# cd rules.d/
[root /etc/udev/rules.d]# ls
01-usbmount.rules     automount.rules       local.rules
99-bufferclass.rules  autonet.rules         localextra.rules
[root /etc/udev/rules.d]# cd ../scripts/
[root /etc/udev/scripts]# ls -al
total 16
drwxr-xr-x    2 root     root          4096 Jan 26  2015 .
drwxr-xr-x    4 root     root          4096 Jan  1 00:37 ..
-rwxr-xr-x    1 root     root          1763 Jan 26  2015 mount.sh
-rwxr-xr-x    1 root     root          1402 Jan 26  2015 network.sh
[root /etc/udev/scripts]#

And I checked permissions on /var /volatile and /run:

drwxrwxrwx   12 root     root          4096 Jan 30  2015 var
drwxrwxrwx    8 root     root          4096 Jan  1 00:00 volatile
drwxrwxrwx    4 root     root          4096 Jan  1 00:01 run

I even tried making the media directory myself under run and no changes. Finally I added some debug into the mount.sh script, when I run it manually I can see:

/bin/sh: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
checking blacklist
checking blacklist
checking blacklist
checking blacklist

when I remove/insert the USB stick again nothing comes up at all. Clearly, the udev rules aren't being run for some reason...

Brad,

    Here's the updated script:

[root /etc/udev/scripts]# cat mount.sh | head
#!/bin/sh
#
# Called from udev
#
# Attempt to mount any added block devices and umount any removed devices

echo hi > /home/myusbtext.txt
MOUNT="/bin/mount"
PMOUNT="/usr/bin/pmount"
UMOUNT="/bin/umount"

upon removal/insertion of the USB stick there is no file generated:

[root /home]# ls
[root /home]#

If I run the script manually it wil generate the file. So the script is good, but it's not being run as per the udev rule.

Bin Liu,

Here's the dmesg | tail snap shot after insterting the usb:

[ 6465.830007] usb 1-1: new high-speed USB device number 6 using musb-hdrc
[ 6465.972012] usb 1-1: New USB device found, idVendor=154b, idProduct=005b
[ 6465.979124] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 6465.986700] usb 1-1: Product: USB 2.0 FD
[ 6465.990858] usb 1-1: Manufacturer: PNY Technologies
[ 6465.996004] usb 1-1: SerialNumber: AA00000000003099
[ 6466.013459] usb-storage 1-1:1.0: USB Mass Storage device detected
[ 6466.025430] scsi4 : usb-storage 1-1:1.0
[ 6467.229672] scsi 4:0:0:0: Direct-Access     PNY      USB 2.0 FD       1100 PQ: 0 ANSI: 4
[ 6467.254018] sd 4:0:0:0: [sda] 15950592 512-byte logical blocks: (8.16 GB/7.60 GiB)
[ 6467.277982] sd 4:0:0:0: [sda] Write Protect is off
[ 6467.283170] sd 4:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 6467.287841] sd 4:0:0:0: [sda] No Caching mode page found
[ 6467.293549] sd 4:0:0:0: [sda] Assuming drive cache: write through
[ 6467.305607] sd 4:0:0:0: [sda] No Caching mode page found
[ 6467.311320] sd 4:0:0:0: [sda] Assuming drive cache: write through
[ 6467.325247]  sda: sda1
[ 6467.336814] sd 4:0:0:0: [sda] No Caching mode page found
[ 6467.342538] sd 4:0:0:0: [sda] Assuming drive cache: write through
[ 6467.348986] sd 4:0:0:0: [sda] Attached SCSI removable disk
[root /home]#

It looks correct to me... but maybe I'm missing something.

I don't have that issue.  I just ran a clean test to be sure:

1. Booted board (no USB present).
2. Logged in as root.
3. Plugged mass storage device into USB1.
4. Ran "ls /var/volatile/run/media/sda1/" and saw the data of the USB drive.