[IPython-dev] Bug when launching dos commands

Fernando Perez Fernando.Perez at colorado.edu
Thu Oct 27 13:22:35 CDT 2005

Jörgen Stenarson wrote:
> Hi,
> I have found a problem with running dos commands (like dir) when my 
> current directory is on a network share (UNC-path(I'm not sure what UNC 
> means but cmd.exe complains about it)). The cmd.exe can not use UNC 
> paths (paths beginning with \\). What happens is that the cmd.exe can 
> not switch to the UNC address and instead ends up on some default 
> directory on c:/, which means the command you issued will be performed 
> in some other directory than you thought. Could be bad if your doing 
> "del *.*"
> So my workaround patches the shell command in genutils to temporarily 
> switch the current directory to c: and then appending "pushd unc-path&&"
> to the commandline string that is passed to os.system, and finally 
> switch the work dir back to the unc-path. This is done if the os is 
> windows and the workdir starts with \\
> This works because "pushd UNC-path" mounts a network drive and then your 
> path just becomes x:\.... and is thus not a UNC-path anymore.
> This seems to work for me. But I'm not sure if this is the right place 
> or the only place that need to change.

I could certainly use the voice of another win32 expert on helping me evaluate 
this.  Even though I have a windows box now, I have no network shares to even 
test this on, and I don't even know really what  the details are.  I trust 
that you tested it, but I'm a bit worried about applying a patch I don't 
understand at all.

At the very least, please keep on testing it for a few days before we apply 
it, and if any win32 user can comment on whether what Jorgen did is right or 
not, it would be much appreciated.



ps - no tabs in that patch, right ? ;)

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