From: James Dinkel <jdinkel@...>
Date: 2008-09-27T01:19:10+09:00
Subject: popen3 mysteriously hangs

I'm having a problem with a popen3 inexplicably hanging.  I'm trying to
run the rpmbuild command to automate compiling some srpms, as you'll see
below.  For most srpms, the script runs through just fine.  Here's the
relevant popen3 block:

--------------------------
Open3.popen3("rpmbuild --rebuild GConf2-2.14.0-9.el5.src.rpm") do
|stdin, stdout, stderr|
  if stderr.read.split($/)[-1] == '+ exit 0'
    success = true
    output_files = get_output_files(stdout.read)
  end
end
--------------------------

This is on RedHat Enterprise Linux 5.0, using ruby 1.8.5 (2006-08-25).
I've ran "rpmbuild --rebuild GConf2-2.14.0-9.el5.src.rpm" directly from
the command line and it completes just fine in about 2 minutes.

A couple notes, "GConf2-2.14.0-9.el5.src.rpm" would normally be filled
in by a variable, but GConf2-2.14.0-9.el5.src.rpm is one of the srpms
that hang the system.  Also, get_output_files() is my own method which I
would suspect as hanging, but binaries from the rpmbuild are never
created, so it must never even make to that point.

Any help troubleshooting this would be appreciated, or maybe someone
knows of a better way to run this command and capture stdout and stderr.

Thanks,

James
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