Implementation: Changeset Rules

• There are many rules for writing changesets:

  • changesets are numbered in the order you need them to run
  • changesets can be run multiple times and have to be written accordingly
  • do not generate any stderr output unless it's a warning or error
  • changesets run under bash's errexit. All lines of code have to return true
  • you cannot change the current directory, but you can use pushd/popd
  • you must not use apt-get install -y foo to get its dependencies: list all the dependencies and remove conflicting packages first. This safeguards you against some package removing other ones you didn't expect
  • remember, this all runs unattended, expect the unexpected and be very careful

Notes: