- The Cask `sip`, to give a random example, was failing this RuboCop
because it has a `livecheck` block within an `on_*` block and the
livecheck block and the top-level Cask both have `url` stanzas. This
is a legitimate use of `livecheck` blocks because the cask software
download URL and the livecheck version check URL are not the same
thing, so let's skip over `livecheck` blocks and their contents.
- I wrote this because I was concerned that I'd done something wrong
since `brew style --only=Cask/NoOverrides` in
`$(brew --repo homebrew/cask)` didn't report any offenses. Turns out
I'd just missed the `.` off the end of the command to target the
current directory! But, the cost of writing the test is sunk now,
and more tests can't hurt?
- In the event that there's only one common stanza within the `on_*`
blocks (eg, `url`) with a generic `version` that doesn't change per-OS,
let's not force adding `version` to each `on_*` block as well.
- As discussed in
https://github.com/Homebrew/brew/pull/14976#issuecomment-1474544569
and further comments, this is needed because in order to enforce the
order of `on_{arch,system}` blocks we need to have everything
consistently within one of those blocks.
- We previously allowed overrides where the top-level `version` stanza
would be the default, unless on an OS that had an `on_system` block
with a `version` specified. But this breaks down when we try to order
the `on_system` blocks because if a `url` at the top-level has a
`version` interpolated in it, then the `version` stanza needs to be
above the `url` stanza. But it could be that `version` is OS-specific.
- Let's stop allowing overrides and require that everything be in an
`on_system` block. This will make it easier to enforce the order of
`on_system` blocks in a future PR (14976).
