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Date: Wed, 17 Mar 2010 19:35:21 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: cygwin 1.7: why there is a directory E/cygwin/dev in the tree    of  	cygwin ?
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On Mar 17 19:28, Corinna Vinschen wrote:
> On Mar 17 12:21, Eric Blake wrote:
> > On 03/17/2010 02:19 AM, rolandc wrote:
> > > I do not understand why the postinstall script bash.sh is so complex
> > > 
> > >     DEVDIR="$(cygpath -au "C:/$(cygpath -am /dev/)" | sed 's|/c/\(.\):/|/\1/|')"
> > >     mkdir -p "$DEVDIR" || result=1
> > > 
> > > it would be simple (too simple?) to
> > >     mkdir -p /dev || result=1
> > 
> > Yes, it would be too simple.  /dev already exists, so the mkdir would
> > fail to do anything useful.  We REALLY want to create the underlying
> > Windows directory at the same location at where /dev would be mounted,
> > and to do that, we really do want to know the windows location (drive
> > letter and all) of /.  Then, by using mkdir of that fancy windows path
> > that happens to live at the same place as where /dev normally resolves
> > to, then we can guarantee that /dev/stdin gets created as an actual
> > symlink in the windows heirarchy (since it does NOT resolve via the /dev
> > magic mount point), and that tab-completion can see any contents placed
> > into the windows counterpart directory.
> 
> Nothing of this should be necessary since the 000-cygwin-post-install.sh
> script from the base-cygwin package already creates /dev.

Just for clarification, the 000-cygwin-post-install.sh script creates
/dev to be able to create /dev/shm and /dev/mqueue.  These directories
must exist to enable the file-backed implementation of POSIX message
queues, semaphores, and shared memory.  Maybe in the long run we should
create these directories in setup.exe, just like so many other important
directories.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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