The name `print` was used because, previously, the `println`
function name was taken.
This has now changed, allowing the rename of this function to happen.
Instead of repairing downgrades, automatic migration could fail.
This occurs when attempting to load signed references, and a downgrade
is detected while coalescing `RepositoryInfo`.
Similarly to how fetch recovers, automatic migration must also recover
by detecting for the downgrade error, and allowing the migration to
happen in this case.
To be able to reason about backwards compatibility, downgrade attacks,
and future configurable enforcement of minimum required (security)
features, introduce the concept of a "feature level" in Signed
References.
In this implementation feature levels are assumed to be monotonic, i.e.,
that higher feature levels behave like lower ones, and only add
semantics on top.
Implementing this as an `enum` that is `Ord` flows nicely.
Treatment of the write-side is left for the next commit. Currently,
the write side "promises" `FeatureLevel::Parent`, but is not able
to "keep the promise", since it does not actually inspect the
feature level of the head in case it is unchanged.
CHANGELOG
The `help` module is no longer needed, since `clap` handles that.
This meant that the re-exports of each command's `ABOUT` could be removed and
the `const`s can now be private.
This adds `conflicts_with` for `private` and `public` to simplify the logic that checks for the document visibility
(thank you Fintan)
Co-authored-by: Fintan Halpenny <fintan.halpenny@gmail.com>
Fintan Halpenny
Lorenz Leutgeb
Richard Levitte
Matthias Beyer