D1797.id.diff
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	diff --git a/README.md b/README.md
	--- a/README.md
	+++ b/README.md
	@@ -21,6 +21,13 @@
	docker run -dt -p 8080:4567 -e JENKINS_URL=http://ci.domain.tld nasqueron/tommy
	```

	+### Exit codes
	+
	+The app uses the following exit codes:
	+
	+* 0: regular exit
	+* 1: required configuration environment variable is missing
	+
	### Contributors

	* Written by [@arfon](http://twitter.com/arfon "Twitter")
	diff --git a/tommy.rb b/tommy.rb
	--- a/tommy.rb
	+++ b/tommy.rb
	@@ -32,7 +32,15 @@
	# Environment
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	-JENKINS_URL = ENV['JENKINS_URL'] \|\| 'http://username:password@jenkins.domain.tld'
	+begin
	+ JENKINS_URL = ENV.fetch('JENKINS_URL')
	+rescue KeyError
	+ $stderr.write %(You must define JENKINS_URL to your Jenkins instance URL.
	+
	+If you need to pass credentials, you can use the syntax http://username:password@jenkins.domain.tld.
	+)
	+ exit 1
	+end

	# -------------------------------------------------------------
	# Project class