devd based AUTOMOUNTER

[matt]

On 02/17/12 09:49, vermaden wrote:
> Hi,
>
> I have finally made some effort on writing flexible yet very simple automounter for FreeBSD desktop.
>
> Feel free to submit me BUG reports ;)
>
> It currently supports these file formats:
> -- NTFS(rw) requires [port]sysutils/fusefs-ntfs[/port]
> -- FAT/FAT32
> -- exFAT requires [port]sysutils/fusefs-exfat[/port]
> -- EXT2
> -- EXT3
> -- EXT4 requires [port]sysutils/fusefs-ext4fuse[/port]
> -- UFS (DOH!)
>
> It keeps state of the mounted devices at /var/run/automount.state and logs all activities to /var/log/automount.log file.
>
> The place for the script is at /usr/local/sbin/automount.sh executable.
>
> The only additional configuration it requires are those lines at the end of /etc/devd.conf file along with restarting /etc/rc.d/devd daemon.
>
> notify 200 {
>   match "system" "DEVFS";
>   match "type" "CREATE";
>   match "cdev" "(da|mmcsd)[0-9]+";
>   action "/usr/local/sbin/automount.sh $cdev attach";
> };
>
> notify 200 {
>   match "system" "DEVFS";
>   match "type" "DESTROY";
>   match "cdev" "(da|mmcsd)[0-9]+";
>   action "/usr/local/sbin/automount.sh $cdev detach";
> };
>
> The /usr/local/sbin/automount.sh executable is here:
>
> #! /bin/sh
>
> PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin
> LOG="/var/log/automount.log"
> STATE="/var/run/automount.state"
> DATEFMT="%Y-%m-%d %H:%M:%S"
>
> __create_mount_point() { # /* 1=DEV */
>   MNT="/mnt/$( basename ${1} )"
>   mkdir -p ${MNT}
> }
>
> __state_lock() {
>   while [ -f ${STATE}.lock ]; do sleep 0.5; done
>   :> ${STATE}.lock
> }
>
> __state_unlock() {
>   rm ${STATE}.lock
> }
>
> __state_add() { # /* 1=DEV 2=PROVIDER 3=MNT */
>   __state_lock
>   echo "${1} ${2} ${3}" >> ${STATE}
>   __state_unlock
> }
>
> __state_remove() { # /* 1=MNT 2=STATE 3=LINE */
>   LINE=$( grep -n -E "${1}$" ${2} | cut -d : -f 1 )
>   sed -i '' ${3}d ${2}
> }
>
> __log() { # /* @=MESSAGE */
>   echo $( date +"${DATEFMT}" ) ${@} >> ${LOG}
> }
>
> case ${2} in
>   (attach)
>     for I in /dev/${1}*
>     do
>       case $( file -L -s ${I} ) in
>         (*NTFS*)
>           __create_mount_point ${I}
>           ntfs-3g ${I} ${MNT} # /* sysutils/fusefs-ntfs */
>           __log "${I}:mount (ntfs)"
>           ;;
>         (*FAT*)
>           __create_mount_point ${I}
>           fsck_msdosfs -y ${I}
>           mount_msdosfs -o large -o longnames -l -L pl_PL.ISO8859-2 -D cp852 ${I} ${MNT}
>           __log "${I}:mount (fat)"
>           ;;
>         (*ext2*)
>           __create_mount_point ${I}
>           fsck.ext2 -y ${I}
>           mount -t ext2fs ${I} ${MNT}
>           __log "${I}:mount (ext2)"
>           ;;
>         (*ext3*)
>           __create_mount_point ${I}
>           fsck.ext3 -y ${I}
>           mount -t ext2fs ${I} ${MNT}
>           __log "${I}:mount (ext3)"
>           ;;
>         (*ext4*)
>           __create_mount_point ${I}
>           fsck.ext4 -y ${I}
>           ext4fuse ${I} ${MNT} # /* sysutils/fusefs-ext4fuse */
>           __log "${I}:mount (ext4)"
>           ;;
>         (*Unix\ Fast\ File*)
>           __create_mount_point ${I}
>           fsck_ufs -y ${I}
>           mount ${I} ${MNT}
>           __log "${I}:mount (ufs)"
>           ;;
>         (*)
>           case $( dd < ${O} count=1 | strings | head -1 ) in
>             (EXFAT)
>               __create_mount_point ${I}
>               mount.exfat ${I} ${MNT} # /* sysutils/fusefs-exfat */
>               __log "${I}:mount (ufs)"
>               ;;
>             (*) continue ;;
>           esac
>           ;;
>       esac
>       __state_add ${I} $( mount | grep " ${MNT} " | awk '{printf $1}' ) ${MNT}
>     done
>     ;;
>
>   (detach)
>     MOUNTED=$( mount )
>     __state_lock
>     while read DEV PROVIDER MNT
>     do
>       TARGET=$( echo "${MOUNTED}" | grep -E "^${PROVIDER} " | awk '{print $3}' )
>       [ -z ${TARGET} ] && {
>         __state_remove ${MNT} ${STATE} ${LINE}
>         continue
>       }
>       umount -f ${TARGET} &
>       unset TARGET
>       __state_remove ${MNT} ${STATE} ${LINE}
>       __log "${DEV}:umount"
>     done < ${STATE}
>     __state_unlock
>     __log "/dev/${1}:detach"
>     ;;
>
> esac
>
>
> PS. Below are links for 'mirror' threads.
> http://forums.freebsd.org/showthread.php?t=29895
> http://daemonforums.org/showthread.php?t=6838
>
> Regards,
> vermaden
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> ---
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Some things to consider/test:

How do I set custom flags, like nosuid,noatime,nodev,noexec,async (or
sync) for mounts?
What if make a usb drive with an illegal name, existing name or other
dangerous values?
Can I use the automounter to either mount over another mount to
impersonate it, or can I overwrite arbitrary files or directories?

Some of these above things don't work on Linux with udev (i.e. gnome-vfs
automount gets some fairly generous flags automatically)
I didn't get a chance to test some of the naming things on Linux either,
as many drive formatting programs validate the name.

Something to consider,

Matt

Matt