fix: handle renamed dependency for cargo registery

- When a dependency is renamed, specified via `package="actual-name"` in
Cargo.toml, this should become the name of the depedency when the
package is retrieved from the registery by cargo and the old name should
be available in the `package` field.
- The reference implementation also does this: 490e66a9d6/src/controllers/krate/publish.rs (L702-L705)
- Resolves #5936
- Unit test added.

modules/packages/cargo/parser.go

@@ -96,7 +96,7 @@ func parsePackage(r io.Reader) (*Package, error) {
 			Target             *string  `json:"target"`
 			Kind               string   `json:"kind"`
 			Registry           *string  `json:"registry"`
-			ExplicitNameInToml string   `json:"explicit_name_in_toml"`
+			ExplicitNameInToml *string  `json:"explicit_name_in_toml"`
 		} `json:"deps"`
 		Features      map[string][]string `json:"features"`
 		Authors       []string            `json:"authors"`
@@ -136,8 +136,16 @@ func parsePackage(r io.Reader) (*Package, error) {
 
 	dependencies := make([]*Dependency, 0, len(meta.Deps))
 	for _, dep := range meta.Deps {
+		name := dep.Name
+		packageName := dep.ExplicitNameInToml
+		// If the explicit_name_in_toml field is set, the package is renamed and
+		// should be set accordingly.
+		if dep.ExplicitNameInToml != nil {
+			name = *dep.ExplicitNameInToml
+			packageName = &dep.Name
+		}
 		dependencies = append(dependencies, &Dependency{
-			Name:            dep.Name,
+			Name:            name,
 			Req:             dep.VersionReq,
 			Features:        dep.Features,
 			Optional:        dep.Optional,
@@ -145,6 +153,7 @@ func parsePackage(r io.Reader) (*Package, error) {
 			Target:          dep.Target,
 			Kind:            dep.Kind,
 			Registry:        dep.Registry,
+			Package:         packageName,
 		})
 	}
 

modules/packages/cargo/parser_test.go

@@ -22,7 +22,7 @@ const (
 )
 
 func TestParsePackage(t *testing.T) {
-	createPackage := func(name, version string) io.Reader {
+	createPackage := func(name, version, dependency string) io.Reader {
 		metadata := `{
    "name":"` + name + `",
    "vers":"` + version + `",
@@ -32,7 +32,7 @@ func TestParsePackage(t *testing.T) {
       {
          "name":"dep",
          "version_req":"1.0"
-      }
+      }` + dependency + `
    ],
    "homepage":"` + homepage + `",
    "license":"` + license + `"
@@ -48,7 +48,7 @@ func TestParsePackage(t *testing.T) {
 
 	t.Run("InvalidName", func(t *testing.T) {
 		for _, name := range []string{"", "0test", "-test", "_test", strings.Repeat("a", 65)} {
-			data := createPackage(name, "1.0.0")
+			data := createPackage(name, "1.0.0", "")
 
 			cp, err := ParsePackage(data)
 			assert.Nil(t, cp)
@@ -58,7 +58,7 @@ func TestParsePackage(t *testing.T) {
 
 	t.Run("InvalidVersion", func(t *testing.T) {
 		for _, version := range []string{"", "1.", "-1.0", "1.0.0/1"} {
-			data := createPackage("test", version)
+			data := createPackage("test", version, "")
 
 			cp, err := ParsePackage(data)
 			assert.Nil(t, cp)
@@ -67,7 +67,7 @@ func TestParsePackage(t *testing.T) {
 	})
 
 	t.Run("Valid", func(t *testing.T) {
-		data := createPackage("test", "1.0.0")
+		data := createPackage("test", "1.0.0", "")
 
 		cp, err := ParsePackage(data)
 		assert.NotNil(t, cp)
@@ -84,4 +84,25 @@ func TestParsePackage(t *testing.T) {
 		content, _ := io.ReadAll(cp.Content)
 		assert.Equal(t, "test", string(content))
 	})
+
+	t.Run("Renamed dependency", func(t *testing.T) {
+		data := createPackage("test", "1.0.0", `, {"name":"v4l2-sys", "version":"0.3.0", "explicit_name_in_toml":"v4l2-sys-mit"}`)
+
+		cp, err := ParsePackage(data)
+		assert.NotNil(t, cp)
+		require.NoError(t, err)
+
+		assert.Equal(t, "test", cp.Name)
+		assert.Equal(t, "1.0.0", cp.Version)
+		assert.Equal(t, description, cp.Metadata.Description)
+		assert.Equal(t, []string{author}, cp.Metadata.Authors)
+		assert.Len(t, cp.Metadata.Dependencies, 2)
+		assert.Equal(t, "dep", cp.Metadata.Dependencies[0].Name)
+		assert.EqualValues(t, "v4l2-sys-mit", cp.Metadata.Dependencies[1].Name)
+		assert.EqualValues(t, "v4l2-sys", *cp.Metadata.Dependencies[1].Package)
+		assert.Equal(t, homepage, cp.Metadata.ProjectURL)
+		assert.Equal(t, license, cp.Metadata.License)
+		content, _ := io.ReadAll(cp.Content)
+		assert.Equal(t, "test", string(content))
+	})
 }