xtask: Add check-raw

Running `cargo xtask check-raw` validates various properties of the code in the
`uefi-raw` package. For example, it checks that no Rust enums are used, that
structs have an appropriate repr for FFI, that raw pointers are used instead of
references, and many other things.

This is run in CI as part of the lint job.

Author: nicholasbishop

.github/workflows/rust.yml

@@ -121,6 +121,9 @@ jobs:
       - name: Verify generated code is up-to-date
         run: cargo xtask gen-code --check
 
+      - name: Run additional checks on the uefi-raw package
+        run: cargo xtask check-raw
+
   # Run the build with our current stable MSRV (specified in
   # ./msrv_toolchain.toml). This serves to check that we don't
   # accidentally start relying on a new feature without intending

Cargo.lock

@@ -14,9 +14,10 @@ itertools = "0.10.5"
 mbrman = "0.5.1"
 nix = { version = "0.26.1", default-features = false, features = ["fs"] }
 os_info = { version = "3.6.0", default-features = false }
-proc-macro2 = "1.0.46"
+proc-macro2 = { version = "1.0.46", features = ["span-locations"] }
 quote = "1.0.21"
 regex = "1.8.1"
 serde_json = "1.0.73"
 syn = { version = "2.0.0", features = ["full"] }
 tempfile = "3.5.0"
+walkdir = "2.3.3"