Auto merge of #5688 - ebroto:fix_cargo_tests_in_rustc, r=flip1995

Fix cargo tests when running inside the rustlang/rust repo

It seems we hit rust-lang/cargo#5418, so I've applied the suggested solution. Also added some more info when cargo-metadata fails to execute.

(there was no open issue for this)

changelog: none

Author: bors

clippy_dev/src/new_lint.rs

@@ -147,6 +147,8 @@ fn get_manifest_contents(lint_name: &str, hint: &str) -> String {
 name = "{}"
 version = "0.1.0"
 publish = false
+
+[workspace]
 "#,
         hint, lint_name
     )

clippy_lints/src/cargo_common_metadata.rs

@@ -36,13 +36,9 @@ declare_clippy_lint! {
     "common metadata is defined in `Cargo.toml`"
 }
 
-fn warning(cx: &LateContext<'_, '_>, message: &str) {
-    span_lint(cx, CARGO_COMMON_METADATA, DUMMY_SP, message);
-}
-
 fn missing_warning(cx: &LateContext<'_, '_>, package: &cargo_metadata::Package, field: &str) {
     let message = format!("package `{}` is missing `{}` metadata", package.name, field);
-    warning(cx, &message);
+    span_lint(cx, CARGO_COMMON_METADATA, DUMMY_SP, &message);
 }
 
 fn is_empty_str(value: &Option<String>) -> bool {
@@ -66,12 +62,7 @@ impl LateLintPass<'_, '_> for CargoCommonMetadata {
             return;
         }
 
-        let metadata = if let Ok(metadata) = cargo_metadata::MetadataCommand::new().no_deps().exec() {
-            metadata
-        } else {
-            warning(cx, "could not read cargo metadata");
-            return;
-        };
+        let metadata = unwrap_cargo_metadata!(cx, CARGO_COMMON_METADATA, false);
 
         for package in metadata.packages {
             if is_empty_vec(&package.authors) {

clippy_lints/src/multiple_crate_versions.rs

@@ -7,7 +7,7 @@ use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::DUMMY_SP;
 
-use cargo_metadata::{DependencyKind, MetadataCommand, Node, Package, PackageId};
+use cargo_metadata::{DependencyKind, Node, Package, PackageId};
 use if_chain::if_chain;
 use itertools::Itertools;
 
@@ -42,13 +42,7 @@ impl LateLintPass<'_, '_> for MultipleCrateVersions {
             return;
         }
 
-        let metadata = if let Ok(metadata) = MetadataCommand::new().exec() {
-            metadata
-        } else {
-            span_lint(cx, MULTIPLE_CRATE_VERSIONS, DUMMY_SP, "could not read cargo metadata");
-            return;
-        };
-
+        let metadata = unwrap_cargo_metadata!(cx, MULTIPLE_CRATE_VERSIONS, true);
         let local_name = cx.tcx.crate_name(LOCAL_CRATE).as_str();
         let mut packages = metadata.packages;
         packages.sort_by(|a, b| a.name.cmp(&b.name));

clippy_lints/src/utils/mod.rs

@@ -1405,6 +1405,24 @@ pub fn run_lints(cx: &LateContext<'_, '_>, lints: &[&'static Lint], id: HirId) -
     })
 }
 
+#[macro_export]
+macro_rules! unwrap_cargo_metadata {
+    ($cx: ident, $lint: ident, $deps: expr) => {{
+        let mut command = cargo_metadata::MetadataCommand::new();
+        if !$deps {
+            command.no_deps();
+        }
+
+        match command.exec() {
+            Ok(metadata) => metadata,
+            Err(err) => {
+                span_lint($cx, $lint, DUMMY_SP, &format!("could not read cargo metadata: {}", err));
+                return;
+            },
+        }
+    }};
+}
+
 #[cfg(test)]
 mod test {
     use super::{trim_multiline, without_block_comments};

clippy_lints/src/wildcard_dependencies.rs

@@ -34,12 +34,7 @@ impl LateLintPass<'_, '_> for WildcardDependencies {
             return;
         }
 
-        let metadata = if let Ok(metadata) = cargo_metadata::MetadataCommand::new().no_deps().exec() {
-            metadata
-        } else {
-            span_lint(cx, WILDCARD_DEPENDENCIES, DUMMY_SP, "could not read cargo metadata");
-            return;
-        };
+        let metadata = unwrap_cargo_metadata!(cx, WILDCARD_DEPENDENCIES, false);
 
         for dep in &metadata.packages[0].dependencies {
             // VersionReq::any() does not work

tests/compile-test.rs

@@ -220,10 +220,6 @@ fn run_ui_cargo(config: &mut compiletest::Config) {
         Ok(result)
     }
 
-    if cargo::is_rustc_test_suite() {
-        return;
-    }
-
     config.mode = TestMode::Ui;
     config.src_base = Path::new("tests").join("ui-cargo").canonicalize().unwrap();
 

tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml

@@ -2,3 +2,5 @@
 name = "cargo_common_metadata"
 version = "0.1.0"
 publish = false
+
+[workspace]

tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml

@@ -9,3 +9,5 @@ readme = "README.md"
 license = "MIT OR Apache-2.0"
 keywords = ["metadata", "lint", "clippy"]
 categories = ["development-tools::testing"]
+
+[workspace]

tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml

@@ -5,6 +5,8 @@ name = "multiple_crate_versions"
 version = "0.1.0"
 publish = false
 
+[workspace]
+
 # One of the versions of winapi is only a dev dependency: allowed
 [dependencies]
 ctrlc = "=3.1.0"

tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml

@@ -3,6 +3,8 @@ name = "multiple_crate_versions"
 version = "0.1.0"
 publish = false
 
+[workspace]
+
 [dependencies]
 ctrlc = "=3.1.0"
 ansi_term = "=0.11.0"