if [ -w branching: how to spot a locked USB stick

Eric Blake ebb9@byu.net
Fri Jul 13 12:45:00 GMT 2007


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According to fergus on 7/13/2007 12:03 AM:
> This question isn't strictly Cygwin, but I hope it's OK to ask it in the
> context of Cygwin on a portable device eg a CD or a usb mobile drive or
> memory stick: the bash command
> 
>     if [ -w /h ] ; then echo +W ;  else echo -W ; fi
> 
> tests a device located at /h (or /cygdrive/h) for write-ability: eg a
> USB memory stick will echo +W and a CD will echo -W. If the stick is
> locked, however, you still get +W.

Actually, this is a cygwin question.  Bash's [ command only reports what
access("/h",W_OK) tells it to report, so the real question here is why
cygwin1.dll thinks that a locked USB stick is writable.  And the answer
may be that either cygwin doesn't ask Windows the correct question (in
which case, http://cygwin.com/acronyms/#PTC), or that Windows lies (in
which case, there is no way to work around it).

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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