How to find the mountpoint a file resides on?

Question

For example, I\'ve got a file with the following path:

/media/my_mountpoint/path/to/file.txt

I\'ve got the whole path and want to get:

Answer 1

My python is rusty, however you can use something like this with perl :

export PATH_TO_LOOK_FOR="/media/path";
perl -ne '@p = split /\s+/; print "$p[1]\n" if "'$PATH_TO_LOOK_FOR'" =~ m@^$p[1]/@' < /proc/mounts

notice the " ' ' " around $PATH_TO_LOOK_FOR otherwise it won't work.

//edit : python solution :

def find_mountpoint(path):
    for l in open("/proc/mounts", "r"):
        mp = l.split(" ")[1]
        if(mp != "/" and path.find(mp)==0): return mp

    return None

Answer 2

Since python is not a requirement:

df "$filename" | awk 'NR==1 {next} {print $6; exit}'

The NR==1 {next} is to skip the header line that df outputs. $6 is the mount point. exit is to make sure we output only one line.