1  Set `PROPELLOR_DEBUG=1` in the environment, or `git config propellor.debug 1`
2  to make propellor print out all the commands it runs and any other debug
3  messages that Properties choose to emit.
4  
5  Another handy debugging tip is to load up your config.hs in ghci, and look
6  at `hosts`. This will show the Properties of a Host, as well as the Info
7  associated with it, etc.