Re: coredata sql store on WebDAV mounted volume

FROM : Bill Bumgarner
DATE : Thu May 18 20:52:57 2006

On May 18, 2006, at 11:29 AM, Jesse Grosjean wrote:

> It seems that coredata sql stores can't be read or written from 
> WebDAV volumes. It doesn't work with my app, or with the OutlineEdit 
> demo app. Does anyone know of a workaround? If there is no work 
> around what's the best way to test for this case so that I can give 
> the user a more descriptive error message?


That is by design.

WebDAV is incapable of supporting non-atomic reads/writes.  As such, 
there is no useful reason -- and many reasons not to -- store a SQLite 
database, through Core Data or otherwise, on a WebDAV based filesystem.

Use an XML or Binary store instead.

The following can be used to test FS type:

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    struct statfs fsInfo;

    NSLog(@"Testing %s", argv[1]);
    if (statfs(argv[1],  &fsInfo) == -1) {
        NSLog(@"Error %s", argv[1]);
        exit(1);
    }

    if (fsInfo.f_flags & MNT_RDONLY) {
        NSLog(@"Read only %s", argv[1]);
        exit(0);
    }

    NSLog(@"Type %s", fsInfo.f_fstypename);

    [pool release];
    return 0;
}