138 lines
3.2 KiB
Bash
Executable File
138 lines
3.2 KiB
Bash
Executable File
#!/bin/sh
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# Uncomment the following line to get debug info
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#set -x
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SELF=${SELF:-$(basename $0)}
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LOCK_FILE=/var/lock/share.lock
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source /usr/local/lib/utils
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source usb_gadget
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# The USB network interface file
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USB_IF=/etc/network/interfaces.d/usb0
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# The USB mass storage backing store file or partition
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BACKING_STORE_FILE=/sys/kernel/config/usb_gadget/FunKey/functions/mass_storage.mmcblk0p3/lun.0/file
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# Unmount a local share
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unmount_share () {
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umount /mnt || die 1 "cannot unmount the backing store partition"
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return 0
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}
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# Mount a share locally
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mount_share () {
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mount | grep -q /dev/mmcblk0p3
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if [ $? -ne 0 ]; then
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# Check if the FAT32 partition has been unmounted cleanly
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fsck.fat -n /dev/mmcblk0p3 2>/dev/null | egrep -q "Dirty bit"
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if [ $? -eq 0 ]; then
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# The FAT32 partition was not cleanly unmounted, try to
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# clean it
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warn "the backing store partition was not properly unmounted"
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#warn "the backing store partition was not properly
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#unmounted, clean it"
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# fsck.fat -a -t -w /dev/loop0 >/dev/null 2>&1
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# if [ $? -gt 1 ]; then
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# die 3 "cannot clean backing store file"
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# fi
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fi
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# Mount the backing store file locally
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mount /mnt/ || die 4 "cannot mount backing store partition"
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fi
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# Create the directory structure if required
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(cd /mnt; mkdir -p "Atari lynx" "Game Boy" "Game Boy Color" "Game Boy Advance" "Game Gear" "Neo Geo Pocket" "NES" "PS1" "Sega Genesis" "Sega Master System" "SNES" "WonderSwan")
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return 0
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}
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# Initialize the backing store if needed and mount it locally
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init_share () {
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if [ -f ${LOCK_FILE} ]; then
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return 0
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fi
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touch ${LOCK_FILE}
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# Initialize the USB gadget
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init_usb_gadget
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# Mount the backing store partition locally
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mount_share
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return 0
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}
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# Stop sharing the backing store partition
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stop_share () {
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# Stop sharing the backing store partition
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echo > $BACKING_STORE_FILE || die 11 "the backing store partition is still mounted on host"
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# 3) Mount the backing store partition locally
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mount_share
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info "stopped sharing the backing store partition"
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return 0
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}
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# Start sharing the backing store partition
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start_share () {
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# 1) Check if the backing store partition is already shared
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cat $BACKING_STORE_FILE | egrep -q ^/dev/mmcblk0p3 && die 12 "the backing store partition is already shared"
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# 2) Check if USB data is connected
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is_usb_data_connected > /dev/null 2>&1 || die 13 "USB sharing impossible, not connected to a host"
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# 3) Unmount the backing store partition if it is locally mounted
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unmount_share
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# 4) Everything is now clear to start sharing the backing store partition
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info "start sharing the backing store partition"
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echo /dev/mmcblk0p3 > $BACKING_STORE_FILE || die 14 "cannot share the backing store partition"
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}
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# Return if currently sharing
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is_share_started () {
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cat $BACKING_STORE_FILE | egrep -q ^/dev/mmcblk0p3
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local res=$?
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if [ "$res" == "0" ]; then
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echo "yes"
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else
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echo "no"
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fi
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return $res
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}
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case "$1" in
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init)
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init_share
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;;
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start)
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start_share
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;;
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stop)
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stop_share
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;;
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is_sharing)
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is_share_started
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;;
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*)
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die 15 "Usage $0 {init|start|stop|is_sharing}"
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;;
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esac
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exit $?
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