umount doesn't umount

[David E Euresti]

Indeed Cygwin thinks that because the name has a colon it's a win32 path.

In mount_info::conv_to_win32_path

  /* An MS-DOS spec has either a : or a \.  If this is found, short
     circuit most of the rest of this function. */
  if (strpbrk (src_path, ":\\") != NULL || slash_unc_prefix_p (src_path))

Maybe I'll have to use something that's not a colon.

But I did find a way to clean up the mess.
If mount looks like this
$ mount
C:\cygwin\bin on /usr/bin type system (binmode)
C:\cygwin\lib on /usr/lib type system (binmode)
C:\cygwin on / type system (binmode)
c: on /blah:a type user (textmode)

$umount c:
seems to clean it up.

$ mount
C:\cygwin\bin on /usr/bin type system (binmode)
C:\cygwin\lib on /usr/lib type system (binmode)
C:\cygwin on / type system (binmode)
c: on /cygdrive/c type user (binmode,noumount)

But maybe the correct test for Win32ness is if it's a letter followed by a
colon.  Or if the colon is the 2nd letter in the name.  That way colons
can be used later.


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