Download the previously stored tap migrations files for homebrew/core
and homebrew/cask from the formulae.brew.sh API.
This adds a much longer stale time (24 hours) to decide whether or not
the migrations files need downloaded from the API in Ruby land.
`brew update` will still update them every time.
Requires https://github.com/Homebrew/brew/pull/15628
Fixes https://github.com/Homebrew/brew/issues/14897
Instead of doing so literally whenever we query for a formula, Instead
do so only when we're in an auto-updateable command.
This better fits the existing behaviour while still updating when it's
most important to do so.
This sets the default and allows customising how often we try to
download files from the API.
This does not affect `brew update` as we want to always check every time
on an explicit call.
Rather than failing every time we fail to update (breaking most usage
while offline) instead only fail if we cannot obtain the JSON and we
don't have a valid local file we can use.
Also tweak the timeout and retry logic and values to make a bit more
sense in this context and not be so noisy when offline.
- Use raw.githubusercontent.com to download cask source rather than
formulae.brew.sh. This allows us to remove these files
- output the tap's current `HEAD` for both formulae and cask JSON
- use this `HEAD` for the cask-source API to get the exact file on
raw.githubusercontent.com rather than just whatever is newest (which
is what the previous API did)
- set the `Tap` correctly when creating a `Cask` from the API
- if the `formula.json` file exists: print its modified time include
`brew config`
- memoize `tap.git_head` as we'll be calling it a lot in the same
process with the same value
