Question

I’m running Java on a Unix platform. How can I get a list of all mounted filesystems via the Java 1.6 API?

I’ve tried File.listRoots() but that returns a single filesystem (that is, /). If I use df -h I see more than that:

Filesystem      Size   Used  Avail Capacity   iused     ifree %iused  Mounted on
/dev/disk0s2   931Gi  843Gi   87Gi    91% 221142498  22838244   91%   /
devfs          187Ki  187Ki    0Bi   100%       646         0  100%   /dev
map -hosts       0Bi    0Bi    0Bi   100%         0         0  100%   /net
map auto_home    0Bi    0Bi    0Bi   100%         0         0  100%   /home
/dev/disk1s2   1.8Ti  926Gi  937Gi    50% 242689949 245596503   50%   /Volumes/MyBook
/dev/disk2     1.0Gi  125Mi  875Mi    13%     32014    223984   13%   /Volumes/Google Earth

I would expect to see /home as well (at a minimum).

Answer 1

Java doesn’t provide any access to mount points. You have to run system command mount via Runtime.exec() and parse its output. Either that, or parse the contents of /etc/mtab.