Add a crate for deserializing command-line options given as key-values.
This crate leverages serde to deserialize key-value argument strings (a
commonly used pattern in crosvm) into configuration structures. This
will allow us to remove a big part of the manual parsing currently done
in `main.rs`, will provide consistent arguments to the `crosvm run` and
`crosvm device` commands, and results in more precise error reporting.
The use of serde will also allow us to similarly deserialize
configuration structures from configuration files with very little extra
code involved.
As explained in the crate's documentation, its main entry point is a
`from_key_values` function that allows a build a struct implementing
serde's `Deserialize` trait from a key/values string.
In order to integrate transparently with `argh`, there is also a
`FromKeyValue` derive macro that automatically implements `FromArgValue`
for structs deriving from it.
BUG=b:218223240
BUG=b:217480043
TEST=cargo build
TEST=cargo test -p serde_keyvalue
Change-Id: Id6316e40150d5f08a05e6f04e39ecbc73d72dfa0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3439669
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Reviewed-by: Anton Romanov <romanton@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
