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• Most attributes support property expansion
  
  • specified as ${property}
  • evaluated using values of environment variables or Java properties
• Pass-through properties for downstream steps
  
  • @key=value included in output one property per line
  • only supported for exec attribute
• Steps and groups can specify env attribute
  
  • value can be a path to a file to be sourced-in
  • value can be “~“ to indicate command exit status should be ignored
• Steps and groups can specify cwd attribute
  • value is directory to be set before execution of the step command

Parallel Chains

• Dynamically clones process flow subgraph region
• Used for repeating steps for independent portions of test environment
  • e.g. install, uninstall, collect logs on all ONOS instances concurrently
• Has an iteration variable specified as ${var#} property
• Clones subgraphs for each of var1, var2, … varN
• Stops cloning when varX becomes undefined or empty
• Value N can be abstracted using ${#} special property