Need help to run script after external SD card mounted

Hi.. I need to run a script AFTER the sdcard is mounted. However, it seems that my script is always run before or when the sdcard is not mounted yet. My phone is rooted already.
This is my script, located at /etc/init.d/myscript.sh

Code:

---

#!system/bin/sh
#this is to show that my script is run properly as root.
chmod 777 /cache
mkdir /cache/foo
### and it runs without any problem. So far so good.
#now I want to check if there is file "foo.img" at my external sd card "/storage/0764-8617"
#of course, there IS  the file at /storage/0764-8617
#i tried all "wait", "loop" below to make sure sdcard is loaded before the "if" block below..
wait /dev/block/loop1
count=10
until [ -d /storage/0764-8617 ] || [ $count -lt 1 ];
do
sleep 1
count=$((count-1));
done;
sleep 10
if [  -f /storage/0764-8617/foo.img  ] ; then
    echo "File existed
else
    echo "File not found"
fi
#but it always spits out that "File not found!"

---

How should I fix this code so that the script can always find /storage/0764-8617/foo.img

this is what mounted in my phone:
cat /proc/mounts

rootfs / rootfs rw,seclabel 0 0
tmpfs /tmp tmpfs rw,seclabel,relatime 0 0
proc /proc proc rw,relatime 0 0
tmpfs /proc/cmdline tmpfs rw,seclabel,relatime 0 0
tmpfs /dev tmpfs rw,seclabel,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,seclabel,relatime,mode=600 0 0
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
adb /dev/usb-ffs/adb functionfs rw,relatime 0 0
sysfs /sys sysfs rw,seclabel,relatime 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,seclabel,relatime 0 0
none /sys/fs/cgroup tmpfs rw,seclabel,relatime,mode=750,gid=1000 0 0
none /acct cgroup rw,relatime,cpuacct 0 0
tmpfs /mnt tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0
/dev/fuse /mnt/runtime/default/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/fuse /mnt/runtime/read/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/fuse /mnt/runtime/write/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/block/vold/public:179,129 /mnt/media_rw/0764-8617 vfat rw,dirsync,nosuid,nodev,noexec,noatime,uid=1023,gi d=1023,fmask=0007,dmask=0007,allow_utime=0020,code page=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
/dev/block/vold/public:179,129 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,noatime,uid=1023,gi d=1023,fmask=0007,dmask=0007,allow_utime=0020,code page=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
/dev/fuse /mnt/runtime/default/0764-8617 fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/fuse /mnt/runtime/read/0764-8617 fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/fuse /mnt/runtime/write/0764-8617 fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/block/dm-0 /mnt/asec/com.UCMobile.intl-2 ext4 ro,dirsync,seclabel,nosuid,nodev,noatime 0 0
tmpfs /storage/emulated tmpfs rw,seclabel,relatime,mode=755,uid=1023,gid=1023 0 0
/emmc@android /system ext4 ro,seclabel,relatime,data=ordered 0 0
/emmc@cache /cache ext4 rw,seclabel,nosuid,nodev,noatime,discard,noauto_da _alloc,data=ordered 0 0
/dev/block/loop101 /cache/QQdata ext4 rw,seclabel,relatime,data=ordered 0 0
/emmc@usrdata /data ext4 rw,seclabel,nosuid,nodev,noatime,discard,noauto_da _alloc,resuid=10010,data=ordered 0 0
/emmc@cache /data/sdext2 ext4 rw,seclabel,nosuid,nodev,noatime,discard,noauto_da _alloc,data=ordered 0 0
/emmc@protect_f /protect_f ext4 rw,seclabel,nosuid,nodev,noatime,nodelalloc,noauto _da_alloc,commit=1,data=ordered 0 0
/emmc@protect_s /protect_s ext4 rw,seclabel,nosuid,nodev,noatime,nodelalloc,noauto _da_alloc,commit=1,data=ordered 0 0
/emmc@cust /cust ext4 rw,seclabel,nosuid,nodev,noatime,discard,noauto_da _alloc,data=ordered 0 0
/emmc@persist /persist ext4 rw,seclabel,nosuid,nodev,noatime,discard,noauto_da _alloc,data=ordered 0 0
/emmc@persist_lg /persist-lg ext4 rw,seclabel,nosuid,nodev,noatime,discard,noauto_da _alloc,data=ordered 0 0
/emmc@mpt /mpt ext4 rw,seclabel,nosuid,nodev,noatime,discard,noauto_da _alloc,data=ordered 0 0
tmpfs /storage tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0
/dev/fuse /storage/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/fuse /storage/0764-8617 fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_ id=1023,default_permissions,allow_other 0 0
/dev/block/loop1 /su ext4 rw,seclabel,noatime,data=ordered 0 0

p/s: I have found a way quite simple, but crazy solution to my problem by directly check and wait for the file and IT WORKS.

Code:

---

until [ -f /storage/0764-8617/foo.img] || [ $count -lt 1 ];

---

but my question is still open: Suppose I don't know the file name "foo.img", how do I make sure that the sd card is fully loaded, and the script above can find /storage/0764-8617/foo.img?

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