Petrified:
name: hello-stratum
kind: stratum
chunks:
- name: hello
  repo: test:hello
  ref: 293fa0b08f0382c63181c36b6efa602876aa8c87
  unpetrify-ref: master
  build-depends: []
  build-mode: test
- name: goodbye
  repo: test:goodbye
  ref: 717c4a523fb5a94ca2f0a61e665fbc2da6a1f6ac
  unpetrify-ref: test/petrify
  build-depends: []
  build-mode: test

Unpetrified:
name: hello-stratum
kind: stratum
chunks:
- name: hello
  repo: test:hello
  ref: master
  build-depends: []
  build-mode: test
- name: goodbye
  repo: test:goodbye
  ref: test/petrify
  build-depends: []
  build-mode: test