I'm guessing TextEdit is using NSURLIsWritableKey like this:
NSURL *url = [NSURL fileURLWithPath:@"/System/" isDirectory:YES]; //
"/System/" isn't writable for most users
NSError *error;
NSNumber *isWritable = nil;
if ( [url getResourceValue:&isWritable forKey:NSURLIsWritableKey
error:&error] ) {
NSLog(@"%@ is %@writable", url, [isWritable boolValue] ? @"" :
@"not ");
}
else {
NSLog(@"Error: %@", error);
}
The NSURLIsWritableKey property reflects W_OK bit in the effective permissions
of the current user as returned by access(2) or getattrlist(2) with the
ATTR_CMN_USERACCESS attribute.
> On Sep 1, 2016, at 2:44 PM, Jeff Schindler <[email protected]> wrote:
>
> Hi,
>
> I am accessing a file from a Windows server over SMB. The file has an ACL
> applied to it on the Windows side such that it is effectively read-only. SMB
> seems to pick this up, as the associated app (TextEdit) says that the file is
> locked, but I'm trying to figure out how I can determine the read-only state
> of that file on the Mac side myself, either from code or the command line.
> Based on what I see, it does not have the com.apple.system.Security extended
> attribute applied to it (I *think* you should be able to see that via "ls
> -ahel@"), and the normal posix permissions don't reflect its read-only state,
> so I'm trying to figure out how TextEdit is picking that up, and how I might
> do the same from code.
>
> Thanks!
> Jeff
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