On Tue, 13 Mar 2018 14:49:56 +0100 <to...@tuxteam.de> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Tue, Mar 13, 2018 at 10:33:43PM +0900, Mark Fletcher wrote:
> > > > > Unless I've misunderstood the question, you can tell if something > > is mounted at a mount point by checking if anything is present > > under the mount point [...] > > Not if the file system is really empty (and no, lost+found doesn't > really count, since not all file systems have that). > But one use-case is unattended synchronisation, possibly over a network. If the directory is mounted, but with some kind of problem, then a check for mounting could succeed without any data being visible to the synchronising application. In the worst case, the backup directory might be synchronised to an apparently empty one.... I prefer to test for the existence of a known lower directory in this case, which tests not only for mounting but for a successful read. -- Joe
