Merge pull request aeolus-incubator#10 from cwolferh/exception_handling

Catch all exceptions at the top level (but don't bury them!)

bin/aeolus

@@ -1,4 +1,22 @@
 #!/usr/bin/env ruby
 
 require 'aeolus_cli/main'
-AeolusCli::Main.start
+
+begin
+  AeolusCli::Main.start
+rescue Exception => ex
+  puts "Error:  #{ex.message}"
+  fname = "/tmp/aeolus-cli-trace-#{Process.pid}.log"
+  the_stack_trace = ex.backtrace().join($/)
+  begin
+    # it is very unlikely writing to /tmp would fail, but
+    # wrap this so we don't bury the original exception
+    f = File.open(fname, "w")
+    puts "For further debugging information, see #{fname}"
+    f.puts the_stack_trace
+    f.close
+  rescue
+    puts "Was unable to write to the following stack trace to #{fname}:"
+    puts the_stack_trace
+  end
+end

cucumber.yml

@@ -0,0 +1,2 @@
+# Default terminal width we use for cucumber tests
+default: THOR_COLUMNS=118

features/exceptions.feature

@@ -0,0 +1,9 @@
+Feature: Exception Handling
+
+  Scenario: Garbage URL Input
+    When I run `aeolus provider list --conductor-url=http://444.444.444.444:444/api --username=test --password=test`
+    Then the aeolus command should write the stack trace to file
+    And the output should contain:
+    """
+    Error:
+    """

features/step_definitions/exceptions_steps.rb

@@ -0,0 +1,11 @@
+require 'aruba/api'
+
+Then /^the aeolus command should write the stack trace to file$/ do
+  /For further debugging information, see (\/tmp\/aeolus-cli-trace-\d+.log)/ =~
+    all_output
+  trace_filename = Regexp.last_match(1)
+
+  # The last line in the stack trace file will look something like
+  # ....../thor-cli/bin/aeolus:6:in `<main>'
+  check_file_content(trace_filename, /bin\/aeolus:\d+:in `<main>/, true)
+end