Auto merge of #13164 - epage:empty, r=weihanglo

fix: Fill in more empty name holes

### What does this PR try to resolve?

This is a follow up to #13152 and expands on work done in #12928.

This is also part of #12801 as I am refactoring how we do validation so that it parts of it can move into the schema, removing the last dependency the schema has on the rest of cargo.

### How should we test and review this PR?

This prevents empty registry names which should be fine for the same reason as preventing empty feature names in #12928, that this was a regression due to changes in toml parsers

### Additional information

Author: bors

src/cargo/util/restricted_names.rs

@@ -43,6 +43,10 @@ pub fn is_conflicting_artifact_name(name: &str) -> bool {
 /// elsewhere. `cargo new` has a few restrictions, such as checking for
 /// reserved names. crates.io has even more restrictions.
 pub fn validate_package_name(name: &str, what: &str, help: &str) -> CargoResult<()> {
+    if name.is_empty() {
+        bail!("{what} cannot be empty");
+    }
+
     let mut chars = name.chars();
     if let Some(ch) = chars.next() {
         if ch.is_digit(10) {

src/cargo/util/toml/mod.rs

@@ -480,10 +480,6 @@ pub fn to_real_manifest(
     };
 
     let package_name = package.name.trim();
-    if package_name.is_empty() {
-        bail!("package name cannot be an empty string")
-    }
-
     validate_package_name(package_name, "package name", "")?;
 
     let resolved_path = package_root.join("Cargo.toml");

src/cargo/util_schemas/core/package_id_spec.rs

@@ -97,9 +97,6 @@ impl PackageIdSpec {
             Some(version) => Some(version.parse::<PartialVersion>()?),
             None => None,
         };
-        if name.is_empty() {
-            bail!("package ID specification must have a name: `{spec}`");
-        }
         validate_package_name(name, "pkgid", "")?;
         Ok(PackageIdSpec {
             name: String::from(name),
@@ -185,9 +182,6 @@ impl PackageIdSpec {
                 None => (String::from(path_name), None),
             }
         };
-        if name.is_empty() {
-            bail!("package ID specification must have a name: `{url}`");
-        }
         validate_package_name(name.as_str(), "pkgid", "")?;
         Ok(PackageIdSpec {
             name,

tests/testsuite/alt_registry.rs

@@ -1546,3 +1546,79 @@ or use environment variable CARGO_REGISTRY_TOKEN",
         )
         .run();
 }
+
+#[cargo_test]
+fn config_empty_registry_name() {
+    let _ = RegistryBuilder::new()
+        .no_configure_token()
+        .alternative()
+        .build();
+    let p = project()
+        .file("src/lib.rs", "")
+        .file(
+            ".cargo/config.toml",
+            "[registry.'']
+            ",
+        )
+        .build();
+
+    p.cargo("publish")
+        .arg("--registry")
+        .arg("")
+        .with_status(101)
+        .with_stderr(
+            "\
+[ERROR] registry name cannot be empty",
+        )
+        .run();
+}
+
+#[cargo_test]
+fn empty_registry_flag() {
+    let p = project().file("src/lib.rs", "").build();
+
+    p.cargo("publish")
+        .arg("--registry")
+        .arg("")
+        .with_status(101)
+        .with_stderr(
+            "\
+[ERROR] registry name cannot be empty",
+        )
+        .run();
+}
+
+#[cargo_test]
+fn empty_dependency_registry() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+
+                [dependencies]
+                bar = { version = "0.1.0", registry = "" }
+            "#,
+        )
+        .file(
+            "src/lib.rs",
+            "
+            extern crate bar;
+            pub fn f() { bar::bar(); }
+            ",
+        )
+        .build();
+
+    p.cargo("check")
+        .with_status(101)
+        .with_stderr(
+            "\
+[ERROR] failed to parse manifest at `[CWD]/Cargo.toml`
+
+Caused by:
+  registry name cannot be empty",
+        )
+        .run();
+}

tests/testsuite/build.rs

@@ -460,7 +460,7 @@ fn cargo_compile_with_empty_package_name() {
 [ERROR] failed to parse manifest at `[..]`
 
 Caused by:
-  package name cannot be an empty string
+  package name cannot be empty
 ",
         )
         .run();

tests/testsuite/cargo_add/empty_dep_name/in

@@ -0,0 +1 @@
+../add-basic.in

tests/testsuite/cargo_add/empty_dep_name/mod.rs

@@ -0,0 +1,24 @@
+use cargo_test_support::compare::assert_ui;
+use cargo_test_support::prelude::*;
+use cargo_test_support::Project;
+
+use cargo_test_support::curr_dir;
+
+#[cargo_test]
+fn case() {
+    cargo_test_support::registry::init();
+    let project = Project::from_template(curr_dir!().join("in"));
+    let project_root = project.root();
+    let cwd = &project_root;
+
+    snapbox::cmd::Command::cargo_ui()
+        .arg("add")
+        .arg_line("@1.2.3")
+        .current_dir(cwd)
+        .assert()
+        .failure()
+        .stdout_matches_path(curr_dir!().join("stdout.log"))
+        .stderr_matches_path(curr_dir!().join("stderr.log"));
+
+    assert_ui().subset_matches(curr_dir!().join("out"), &project_root);
+}

tests/testsuite/cargo_add/empty_dep_name/out/Cargo.toml

@@ -0,0 +1,5 @@
+[workspace]
+
+[package]
+name = "cargo-list-test-fixture"
+version = "0.0.0"

tests/testsuite/cargo_add/empty_dep_name/stderr.log

@@ -0,0 +1 @@
+error: dependency name cannot be empty