[Bash Script] Mount and open android phones automatically. Uses simple-mtpfs(1).

mount-mtp.sh

#!/bin/sh
# this script looks for connected android or MTP devices
# for 30 seconds, and mounts them when connected.
# if any device is already mounted, it just opens them.
# requires simple-mtpfs(1).

# config
mnt=~/Mount/MTP
file_manager="${FILE:-xdg-open}"

main ()
{
    instances
    mountpoints
    for i in $(seq 1 30); do
        mount
        sleep 1
    done
    tmpcleanup
}

# loop over detected devices,
# then mount and open them.
mount ()
{
    for dev in $(simple-mtpfs -l | tr ' ' '%'); do
        dir="$mnt/$(echo $dev | cut -d% -f2)-$(shuf -n1 -i10000-99999)"
        mkdir -p "$dir"
        if simple-mtpfs --device $(echo $dev | cut -d: -f1) "$dir"; then
            $file_manager "$dir"
        else
            rmdir "$dir"
        fi
    done
}

# open already mounted devices,
# cleanup orphaned mountpoints.
mountpoints ()
{
    for dir in "$mnt"/*; do
        [ -d "$dir" ] || continue
        rmdir "$dir"
        file="$dir/test-$(shuf -n1 -i10000-99999)"
        if touch "$file"; then
            rm -f "$file"
            $file_manager "$dir"
        else
            pkill -f "simple-mtpfs.*$dir?" && sleep 0.2
            fusermount -u "$dir"
            rmdir "$dir"
        fi
    done
}

# kill other instances of mmtp.
instances ()
{
    pid="${XDG_RUNTIME_DIR:-/tmp}/mmtp-pid"
    [ -r "$pid" ] && kill -USR1 -- -$(cat $pid)
    trap exit HUP
    trap "trap - EXIT; exit" USR1
    trap "rm $pid" EXIT
    echo $$ > "$pid"
}

# cleanup old simple-mtpfs temp files.
tmpcleanup ()
{
    find /tmp -maxdepth 1 -type d -iname 'simple-mtpfs-*' -mtime +1 \
        -exec rmdir '{}' ';' 2>/dev/null
}

main "$@"
exit