05-28-2009
Cygwin <--> CMD App Problem (Terminal Type?)
I'm not sure if this is the right place to post this, but here it is. We have a nightly process that runs on an HP-UX box to stop our application and backend database servers, unmount their SAN hosted file systems, and then snapshot the SAN LUNs for backup and refresh of data on "report" and "test" systems. For the past five years it's all been done on the HP-UX side. But the new EVA4000 SAN we just moved to was purchased with a Windows 2003 server as the SAN manager.
We still need the snapshot creation/deletion managed from the HP-UX side. So to try and get this to happen, I installed Cygwin on the box. OpenSSH, Bash, and Vim were selected components. I got OpenSSH working great with the auth keys. I also am able to run many Windows CLI commands from the default Bash shell, or if need be set CMD.exe up as a shell for the SSH session. The problem is when I attempt to run the HP Commandview EVA "SSSU.EXE" command. The prompt goes away and there is no output from the app. I have to Ctrl-C to get out and sometimes an image of SSSU.EXE is left running on the system.
If I run SSSU from Bash on the Windows box itself, it also does the same thing. However, if I run it from CMD.EXE on the Windows box, it works. So I tried replacing the shell for the SSH login with CMD.EXE and SSSU still fails. As a test I tried running MS 'EDIT' in CMD directly on the box. That works as expected. But in Bash, or over OpenSSH, it behaves the same way the SSSU does.
What I suspect is happening is that both EDIT and SSSU expect something that only the CMD shell provides when executed locally. Likely some form of console or tty that Cygwin doesn't provide. So my question is... what might these applications be expecting that Cygwin isn't providing?
I wasn't sure whether to post this here or to the Windows mailing list I belong to. It feels kind of halfway between the Windows and *nix worlds.
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LEARN ABOUT DEBIAN
app::cmd::setup
App::Cmd::Setup(3pm) User Contributed Perl Documentation App::Cmd::Setup(3pm)
NAME
App::Cmd::Setup - helper for setting up App::Cmd classes
VERSION
version 0.318
OVERVIEW
App::Cmd::Setup is a helper library, used to set up base classes that will be used as part of an App::Cmd program. For the most part you
should refer to the tutorial for how you should use this library.
This class is useful in three scenarios:
when writing your App::Cmd subclass
Instead of writing:
package MyApp;
use base 'App::Cmd';
...you can write:
package MyApp;
use App::Cmd::Setup -app;
The benefits of doing this are mostly minor, and relate to sanity-checking your class. The significant benefit is that this form
allows you to specify plugins, as in:
package MyApp;
use App::Cmd::Setup -app => { plugins => [ 'Prompt' ] };
Plugins are described in App::Cmd::Tutorial and App::Cmd::Plugin.
when writing abstract base classes for commands
That is: when you write a subclass of App::Cmd::Command that is intended for other commands to use as their base class, you should use
App::Cmd::Setup. For example, if you want all the commands in MyApp to inherit from MyApp::Command, you may want to write that package
like this:
package MyApp::Command;
use App::Cmd::Setup -command;
Do not confuse this with the way you will write specific commands:
package MyApp::Command::mycmd;
use MyApp -command;
Again, this form mostly performs some validation and setup behind the scenes for you. You can use "base" if you prefer.
when writing App::Cmd plugins
App::Cmd::Plugin is a mechanism that allows an App::Cmd class to inject code into all its command classes, providing them with utility
routines.
To write a plugin, you must use App::Cmd::Setup. As seen above, you must also use App::Cmd::Setup to set up your App::Cmd subclass if
you wish to consume plugins.
For more information on writing plugins, see App::Cmd::Manual and App::Cmd::Plugin.
AUTHOR
Ricardo Signes <rjbs@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Ricardo Signes.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
perl v5.14.2 2012-05-05 App::Cmd::Setup(3pm)