Writing a file belonging to root

[David Teller]

      Hi everybody,

I am trying to write to a filesystem in which the root directory belongs to `root`. This works on other platform but fails for some reason on Mac. Can anyone help me?

Steps:

1/ Mount the virtual file system to `filesystem/` using a custom executable. The implementation of the file system is RedoxFS. I'm not the author of said executable.

2/ Check that it is mounted (succeeds)

```
$ ls -lah filesystem/
total 0
drwxr-xr-x   1 root   wheel     0B Jan  1  1970 .
drwxr-xr-x  19 david  staff   646B Oct 31 21:21 ..
```

3/ Attempt to write anything to it as myself (fails, should succeed)

```
$ touch filesystem/foo
touch: filesystem/foo: Permission denied
```

4/ Attempt to write anything to it as `root` (fails, as expected)

```
$ sudo touch filesystem/foo
Password: XXXXXXXX
touch: filesystem/foo: Operation not permitted
```

On Linux, step `3/` works as expected and step `4/` fails as expected. So what am I doing wrong?

Thanks,
 David

[Sam Moffatt]

Hi David,

Try adding '-o allow_other' to your FS invocation. More details here: https://github.com/osxfuse/osxfuse/wiki/Mount-options

The behaviour you're seeing is that OSXFUSE blocks third party users from completing operations on the filesystem by default, including root. However the OS also enforces the permissions that the filesystem is handing back which means that only root can touch the location. Looking at the output of "ls -lah", it seems like the FS is probably not returning the correct response for the root directory given epoch date. I'd expect the FS to default to your own user for the root directory of the FS unless it's picking up the directory stat info from some other location.

Cheers,

Sam

Sam Moffatt
http://pasamio.id.au

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[David Teller]

Thank you very much. Using `allow_root` did the trick.

Cheers,
David