Apple

        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@hidden> 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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References:

>SMB and ACLs (From: Jeff Schindler <email@hidden>)

>Re: SMB and ACLs (From: Jim Luther <email@hidden>)

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