Handling labeling on filesystems that don't support SELinux
I have been working on SELinux support for Puppet. One issue that has
cropped up is the behavior on filesystems which don't support SELinux.
They all appear to get a default label, some seem to allow changing the
label (VFAT) in a non-persistent manner, some seem to throw "not
supported" errors (NFS).
How can I detect if a file is on a filesystem which supports SELinux
without trying to update the label?
The best idea so far as been to parse /proc/mounts and use that to
determine what type of filesystem a file lives on, then check it against
a whitelist (which would include ext3, xfs, ?) but it seems like there
has to be a cleaner/simpler way.
What I would like would be a "getfilecon" call that returns the real
label, ignoring any mount-time defaults.
Any ideas?
Thanks,
Sean