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
plack::app::cgibin
Plack::App::CGIBin(3pm) User Contributed Perl Documentation Plack::App::CGIBin(3pm)
NAME
Plack::App::CGIBin - cgi-bin replacement for Plack servers
SYNOPSIS
use Plack::App::CGIBin;
use Plack::Builder;
my $app = Plack::App::CGIBin->new(root => "/path/to/cgi-bin")->to_app;
builder {
mount "/cgi-bin" => $app;
};
# Or from the command line
plackup -MPlack::App::CGIBin -e 'Plack::App::CGIBin->new(root => "/path/to/cgi-bin")->to_app'
DESCRIPTION
Plack::App::CGIBin allows you to load CGI scripts from a directory and convert them into a PSGI application.
This would give you the extreme easiness when you have bunch of old CGI scripts that is loaded using cgi-bin of Apache web server.
HOW IT WORKS
This application checks if a given file path is a perl script and if so, uses CGI::Compile to compile a CGI script into a sub (like
ModPerl::Registry) and then run it as a persistent application using CGI::Emulate::PSGI.
If the given file is not a perl script, it executes the script just like a normal CGI script with fork & exec. This is like a normal web
server mode and no performance benefit is achieved.
The default mechanism to determine if a given file is a Perl script is as follows:
o Check if the filename ends with ".pl". If yes, it is a Perl script.
o Open the file and see if the shebang (first line of the file) contains the word "perl" (like "#!/usr/bin/perl"). If yes, it is a Perl
script.
You can customize this behavior by passing "exec_cb" callback, which takes a file path to its first argument.
For example, if your perl-based CGI script uses lots of global variables and such and are not ready to run on a persistent environment, you
can do:
my $app = Plack::App::CGIBin->new(
root => "/path/to/cgi-bin",
exec_cb => sub { 1 },
)->to_app;
to always force the execute option for any files.
AUTHOR
Tatsuhiko Miyagawa
SEE ALSO
Plack::App::File CGI::Emulate::PSGI CGI::Compile Plack::App::WrapCGI
See also Plack::App::WrapCGI if you compile one CGI script into a PSGI application without serving CGI scripts from a directory, to remove
overhead of filesystem lookups, etc.
perl v5.14.2 2011-11-02 Plack::App::CGIBin(3pm)