This PR converts `generate-lavamoat-policies.sh` to `.js` using Yargs. This makes it easier to only generate policy files for a specific build type (using the `-t` flag), which is often useful during Flask development. In addition, the `lavamoat:background:auto` scripts are renamed, and the main readme is updated with some useful tips.
Note that `lavamoat:background:auto:dev` is removed and `lavamoat:background:auto` should be used during local development.
The CI script to ensure no LavaMoat policy changes are required has
been failing despite there being no changes. It turns out that the
command used to check for changes (`git diff-index`) was failing
despite the lack of changes because the file was written again by
`yarn lavamoat:auto` but git hadn't gotten around to updating its index
since the write occurred, so it was considering it as changed until it
verified it wasn't [1].
The command has been replaced by `git diff --exit-code --quiet`, which
should do exactly the same thing except that it forces git to update
its internal cache to verify whether changes are present.
[1]: https://stackoverflow.com/questions/34807971/why-does-git-diff-index-head-result-change-for-touched-files-after-git-diff-or-g
A CI job has been added to ensure the `allow-scripts` config and the
LavaMoat auto-generated policy is up-to-date. This will only run on
release branches and the `master` branch, because it's too difficult a
requirement to meet for each PR for contributors on macOS, due to
differences in the dependency graph caused by optional dependencies.
The `allow-scripts` and LavaMoat policy have both been updated using
`yarn allow-scripts auto` and `yarn lavamoat:auto`.
