if [ -w branching: how to spot a locked USB stick
Fri Jul 13 15:59:00 GMT 2007
On Jul 13 10:27, Christopher Faylor wrote:
> On Fri, Jul 13, 2007 at 04:15:26PM +0200, Corinna Vinschen wrote:
> >On Jul 13 08:00, Eric Blake wrote:
> >> According to Corinna Vinschen on 7/13/2007 7:06 AM:
> >> >> Actually, this is a cygwin question. Bash's [ command only reports what
> >> >> access("/h",W_OK) tells it to report,
> >> >
> >> > It's the latter. The fact that the USB stick is locked doesn't
> >> > mean that the permission bits returned by the OS calls are augmented
> >> > to reflect the fact that the stick is not writable. All permission
> >> > bits are still intact. Only when actually trying to write to the device,
> >> > you'll get the Win32 error message equivalent of EROFS.
> >> But POSIX requires access(...,W_OK) to fail with EROFS on a read-only file
> >> system. Is there any way for cygwin to easily determine this without
> >> actually attempting a write?
> >Not that I'm aware of. I added this to my TODO list. However, as
> >usual, http://cygwin.com/acronyms/#PTC.
> Why do I see another bullet item for the "Why is cygwin so slow" discussion
Actually I found that there's a laughable simple way to determine a
read-only device. When calling GetVolumeInformation, the
FILE_READ_ONLY_VOLUME flag is set. I just tested this with a USB
stick. Since we have the information from fs_info anyway, a fix
should be very simple and not affect Cygwin's spee^Wslowness.
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
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