Re^2: -r broken on root

Right... But why does '-r' still says it's readable?

Comment on Re^2: -r broken on root_squash NFS?

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Re^3: -r broken on root_squash NFS? by pc88mxer (Vicar) on Jun 06, 2008 at 21:37 UTC
You're right. I bet perl is determining readability by calling `access(2)`. From the man page: access() may not work correctly on NFS file systems with UID mapping enabled, because UID mapping is done on the server and hidden from the client, which checks permissions. and `root_squash` is a server option.	[reply] [d/l] [select]
Re^4: -r broken on root_squash NFS? by zigdon (Deacon) on Jun 06, 2008 at 22:18 UTC
Could be, I guess, but a quick strace shows it does call 'stat' to get the permissions. But I guess that, on it's own, doesn't tell if the root is squashed or not, so there's no way for perl to know. -- zigdon	[reply]
Re^5: -r broken on root_squash NFS? by sgifford (Prior) on Jun 06, 2008 at 22:31 UTC
That's exactly right, there's not enough information for Perl or the OS to know. The simplest solution is to just try and open the file and see if it fails with a "permission denied" error. -- sgifford's Web page	[reply]