[Gnu-arch-users] [HEY TOM!] unhelpful error for unreadable directories

[Aaron Bentley]

This came up again in IRC last night.  An unreadable directory caused 
inventory traversal to halt with:

PANIC: i/o error in arch_inventory_traversal/is_nested_tree

No filename, no perror-style message.  We ended up using strace to find 
the problem.

There's another error in traversal that does work this way:
i/o error during inventory traversal (%s) for %s\n", errno_to_string 
(errn), file

I'd like to do that here, but, the filename in question is $foo/{arch}, 
where $foo may or may not be a directory, and {arch} usually doesn't exist.

Any suggestions for how to handle this?

Aaron