Local Variable Problems

I am trying to write my deploy script that will work for multiple
deployment environments (sandbox, dev, staging, production).  While
working on this I ran into a problem with variable assignment.  I wrote
some debug scripts to check on somethings and got the strangest
results.  Here is what I wrote in my deploy.rb:

puts "tier: #{tier}" if !tier.nil?
puts tier.nil?.to_s
puts "tier: #{tier}" if !tier.nil?
puts tier.nil?.to_s
if tier.nil?
  tier = 'sandbox'
end
puts "tier: #{tier}"
#puts "ENV[]: " + ENV["TIER"] if !ENV["TIER"]
raise "stop"

I then run the following command from my command line:
cap -S tier=dev deploy

This is what is outputted to my console:
C:\Ruby\InstantRails\rails_apps\video_content_manager>cap -S tier=dev
deploy
    loading configuration
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capis
trano-1.2.0/lib/capistrano/recipes/standard.rb
    loading configuration ./config/deploy.rb
    loading configuration
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongr
el_cluster-0.2.0/lib/mongrel_cluster/recipes.rb
tier: dev
false
tier: dev
false
tier:
./config/deploy.rb:35:in `load': stop (RuntimeError)
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/configuration.rb:146:in `load'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/configuration.rb:125:in `load'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/configuration.rb:125:in `load'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:252:in `execute_recipes!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:252:in `execute_recipes!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:233:in `execute!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:12:in `execute!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/b
in/cap:11
        from C:/Ruby/InstantRails/ruby/bin/cap:18

As you can see on the last line before the exception is thrown the
variable tier suddenly goes to nil.  If I then comment out the
following line:

if tier.nil?
#  tier = 'sandbox'
end

I get the following output:

C:\Ruby\InstantRails\rails_apps\video_content_manager>cap -S tier=dev
deploy
    loading configuration
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capis
trano-1.2.0/lib/capistrano/recipes/standard.rb
    loading configuration ./config/deploy.rb
    loading configuration
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongr
el_cluster-0.2.0/lib/mongrel_cluster/recipes.rb
tier: dev
false
tier: dev
false
tier: dev
./config/deploy.rb:35:in `load': stop (RuntimeError)
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/configuration.rb:146:in `load'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/configuration.rb:125:in `load'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/configuration.rb:125:in `load'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:252:in `execute_recipes!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:252:in `execute_recipes!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:233:in `execute!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/l
ib/capistrano/cli.rb:12:in `execute!'
        from
C:/Ruby/InstantRails/ruby/lib/ruby/gems/1.8/gems/capistrano-1.2.0/b
in/cap:11
        from C:/Ruby/InstantRails/ruby/bin/cap:18

The problem has disappeared.  It seems like capistrano is doing
something weird for an assignment to a local variable that it should
not even be executing.  Please Help!?!?!?


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