Diskutil option to mount under a specific user/UID

Question

I'm coming from the Linux world and I'm used to the commandline; I'm slowly getting up to speed on OS X' command line tools. This one concerns 'mount'.
Under Linux, it's possible to mount a disk under a specific UID; for example to mount an internal EXT3-formatted harddrive and assume all files are owned by user with ID 1000, I'd do something like
$ sudo mount -t ext3 -o uid=1000 /dev/sdb1 /mnt/usbdrive
For OS X, that doesn't seem possible; we have diskutil and I could certainly mount an extra internal HFS+ drive as follows:
$ sudo diskutil mount -mountPoint /Volumes/storage /dev/disk1s1
Is there a way I could force the uid for the mount command?

Answer 1

I'm not sure if I have a solution, but here are some questions:
a) have you tried writing additional input to the OutputStream of the process? Although I have not tried it, I would imagine that Process.getOutputStream() exists for commands that require the invoking resource to send additional input to the process- like an su command that requires a password check.
b) can you just write a shell script that takes the needed information as an argument. That is, write a shell script that takes the username and password as an argument and then you can use Runtime like,
Runtime.exec("myScript", new String[] { "hisId", "hisPasswd" });Obviously, you would need to think through the security concerns of such a script, but, if it complies with the security structure of your environment, it might allow you to avoid the problem by using the shell script to invoke the destination command with the proper UID and password, rather then using the JVM to invoke it. Basically, the script becomes a proxy for the JVM to invoke that command.