getfilecon() and friends in libselinux

[Joshua Brindle <jbrindle@tresys.com>]

Some applications in setools, namely findcon, replcon and indexcon walk 
the filesystem and get the file context off files. Previously it was 
fairly known what filesystems supported labeling so they were defined 
during the build process but now that other filesystems (reiser, jfs and 
tmpfs) support labeling but aren't necessarilly widespread we can't 
reliably define the supported filesystems during the build process and 
expect it to work across systems.

The idea is to iterate the filesystem mount points and do a getfilecon() 
or similar on a file in it, then examine the error code returned to 
decide if the filesystem supports xattr and also supports the security 
namespace. Is this a stable API to rely on for this? Will the error 
codes remain stable?

Further, if there is ever support for contexts via psids or something 
that isn't xattr will getfilecon() also be a supported method for 
accessing those?

Joshua Brindle
Tresys Technology

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