Lines in AWS CodeBuild buildspec commands are being broken when converted to YAML

[eamonnfaherty]

When you create an AWS Codebuild project with a buildspec and have lines longer than 200 chars the resultant YAML generated by troposphere is not accepted by CodeBuild as a valid buildspec as the lines are broken onto multiple lines.

This is the default behaviour in pyyaml. To resolve you need to specify a width parameter to dump to avoid this from happening.

[markpeek]

troposphere uses cfn_flip to convert from json to yaml and cfn_flip then calls pyyaml. Introducing a width parameter would require changes to both packages. An easy workaround is to emit the yaml via something like this:

...
buildspec = """long line"""
t = Template()
t.add_resource(Source(BuildSpec=buildspec, Type="NO_SOURCE"))
print(yaml.dump(t.to_dict(), width=10000))