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DOI: 10.4230/LIPIcs.ECOOP.2017.12
muPuppet: A Declarative Subset of the Puppet Configuration Language

Authors: Weili Fu, Roly Perera, Paul Anderson, and James Cheney

Published in: LIPIcs, Volume 74, 31st European Conference on Object-Oriented Programming (ECOOP 2017)

Abstract
Puppet is a popular declarative framework for specifying and managing complex system configurations. The Puppet framework includes a domain-specific language with several advanced features inspired by object-oriented programming, including user-defined resource types, ‘classes’ with a form of inheritance, and dependency management. Like most real-world languages, the language has evolved in an ad hoc fashion, resulting in a design with numerous features, some of which are complex, hard to understand, and difficult to use correctly. We present an operational semantics for muPuppet, a representative subset of the Puppet language that covers the distinctive features of Puppet, while excluding features that are either deprecated or work-in-progress. Formalising the semantics sheds light on difficult parts of the language, identifies opportunities for future improvements, and provides a foundation for future analysis or debugging techniques, such as static typechecking or provenance tracking. Our semantics leads straightforwardly to a reference implementation in Haskell. We also discuss some of Puppet’s idiosyncrasies, particularly its handling of classes and scope, and present an initial corpus of test cases supported by our formal semantics.
Cite as

Weili Fu, Roly Perera, Paul Anderson, and James Cheney. muPuppet: A Declarative Subset of the Puppet Configuration Language. In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, pp. 12:1-12:27, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{fu_et_al:LIPIcs.ECOOP.2017.12,
  author =	{Fu, Weili and Perera, Roly and Anderson, Paul and Cheney, James},
  title =	{{muPuppet: A Declarative Subset of the Puppet Configuration Language}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{12:1--12:27},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-035-4},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{74},
  editor =	{M\"{u}ller, Peter},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2017.12},
  URN =		{urn:nbn:de:0030-drops-72656},
  doi =		{10.4230/LIPIcs.ECOOP.2017.12},
  annote =	{Keywords: configuration languages, Puppet, operational semantics}
}
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