From: Fritz Anderson <fritza@...>
Date: 2008-12-09T07:23:56+09:00
Subject: Kernel.exec won't find a file that File.expand_path can

I'm doing a fork/exec on a .rb file in the same directory as the parent
.rb. On two systems, this has worked. On the third, to which I just
moved, I get

./ecod-poll:254:in `exec': No such file or directory -
/home/fritza/ecod/mail-tail/ecod-tracker.rb (Errno::ENOENT)

I've put debugging puts'es into the code, and the path I'm using looks
OK. Feeding the path from the puts to "ls -l" shows that the file exists
and is world-readable and world-executable.

Would someone please help me figure this out? No doubt it's something
dumb, but I'm just not seeing it.

===

On the non-working system: ruby 1.8.5 (2006-08-25) [x86_64-linux] |
Rails 2.2.2
On the working system: ruby 1.8.5 (2006-08-25) [x86_64-linux] | Rails
2.0.2

My source on the non-working system is a Subversion checkout of what's
on the working one. Subversion has (I'm pretty sure) successfully
transported between two working systems.

I am also using ActiveRecord standalone, and I'm sure none of the MySQL
and supporting versions match.

===
   while $processQueue.length < MAX_PROCESSES && $requestQueue.length >
0
      messageID = $requestQueue.shift
      pid = fork

      puts "./ecod-tracker.rb ->
#{File.expand_path('./ecod-tracker.rb')}"
      # => ./ecod-tracker.rb ->
/home/fritza/ecod/mail-tail/ecod-tracker.rb
            # ls -l on that path shows an executable file there.
      puts Dir.pwd
      # => /home/fritza/ecod/mail-tail

      exec(File.expand_path('./ecod-tracker.rb'), messageID) if pid.nil?
      # => No such file or directory -
/home/fritza/ecod/mail-tail/ecod-tracker.rb
   end
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