Rollup merge of #69443 - ehuss:tidy-license, r=skade,Mark-Simulacrum

tidy: Better license checks.

This implements some improvements to the license checks in tidy:

* Use `cargo_metadata` instead of parsing vendored crates. This allows license checks to run without vendoring enabled, and allows the checks to run on PR builds.
* Check for stale entries.
* Check that the licenses for exceptions are what we think they are.
* Verify exceptions do not leak into the runtime.

Closes #62618
Closes #62619
Closes #63238 (I think)

There are some substantive changes here. The follow licenses have changed from the original comments:

* openssl BSD+advertising clause to Apache-2.0
* pest MPL2 to MIT/Apache-2.0
* smallvec MPL2 to MIT/Apache-2.0
* clippy lints MPL2 to MIT OR Apache-2.0

Cargo.lock

@@ -386,9 +386,9 @@ dependencies = [
 
 [[package]]
 name = "cargo_metadata"
-version = "0.9.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d2d1617e838936c0d2323a65cc151e03ae19a7678dd24f72bccf27119b90a5d"
+checksum = "46e3374c604fb39d1a2f35ed5e4a4e30e60d01fab49446e08f1b3e9a90aef202"
 dependencies = [
  "semver",
  "serde",
@@ -450,7 +450,7 @@ dependencies = [
 name = "clippy"
 version = "0.0.212"
 dependencies = [
- "cargo_metadata 0.9.0",
+ "cargo_metadata 0.9.1",
  "clippy-mini-macro-test",
  "clippy_lints",
  "compiletest_rs",
@@ -473,7 +473,7 @@ version = "0.2.0"
 name = "clippy_lints"
 version = "0.0.212"
 dependencies = [
- "cargo_metadata 0.9.0",
+ "cargo_metadata 0.9.1",
  "if_chain",
  "itertools 0.9.0",
  "lazy_static 1.4.0",
@@ -2132,7 +2132,7 @@ name = "miri"
 version = "0.1.0"
 dependencies = [
  "byteorder",
- "cargo_metadata 0.9.0",
+ "cargo_metadata 0.9.1",
  "colored",
  "compiletest_rs",
  "directories",
@@ -4860,10 +4860,9 @@ dependencies = [
 name = "tidy"
 version = "0.1.0"
 dependencies = [
+ "cargo_metadata 0.9.1",
  "lazy_static 1.4.0",
  "regex",
- "serde",
- "serde_json",
  "walkdir",
 ]
 

src/bootstrap/test.rs

@@ -728,9 +728,6 @@ impl Step for Tidy {
         let mut cmd = builder.tool_cmd(Tool::Tidy);
         cmd.arg(builder.src.join("src"));
         cmd.arg(&builder.initial_cargo);
-        if !builder.config.vendor {
-            cmd.arg("--no-vendor");
-        }
         if builder.is_verbose() {
             cmd.arg("--verbose");
         }

src/tools/tidy/Cargo.toml

@@ -5,8 +5,7 @@ authors = ["Alex Crichton <alex@alexcrichton.com>"]
 edition = "2018"
 
 [dependencies]
+cargo_metadata = "0.9.1"
 regex = "1"
-serde = { version = "1.0.8", features = ["derive"] }
-serde_json = "1.0.2"
 lazy_static = "1"
 walkdir = "2"