Add Cargo package registry (#21888)

This PR implements a [Cargo registry](https://doc.rust-lang.org/cargo/)
to manage Rust packages. This package type was a little bit more
complicated because Cargo needs an additional Git repository to store
its package index.

Screenshots:

![grafik](https://user-images.githubusercontent.com/1666336/203102004-08d812ac-c066-4969-9bda-2fed818554eb.png)

![grafik](https://user-images.githubusercontent.com/1666336/203102141-d9970f14-dca6-4174-b17a-50ba1bd79087.png)

![grafik](https://user-images.githubusercontent.com/1666336/203102244-dc05743b-78b6-4d97-998e-ef76341a978f.png)

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

models/packages/descriptor.go

@@ -11,6 +11,7 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/packages/cargo"
 	"code.gitea.io/gitea/modules/packages/composer"
 	"code.gitea.io/gitea/modules/packages/conan"
 	"code.gitea.io/gitea/modules/packages/conda"
@@ -129,6 +130,8 @@ func GetPackageDescriptor(ctx context.Context, pv *PackageVersion) (*PackageDesc
 
 	var metadata interface{}
 	switch p.Type {
+	case TypeCargo:
+		metadata = &cargo.Metadata{}
 	case TypeComposer:
 		metadata = &composer.Metadata{}
 	case TypeConan:

models/packages/package.go

@@ -30,6 +30,7 @@ type Type string
 
 // List of supported packages
 const (
+	TypeCargo     Type = "cargo"
 	TypeComposer  Type = "composer"
 	TypeConan     Type = "conan"
 	TypeConda     Type = "conda"
@@ -46,6 +47,7 @@ const (
 )
 
 var TypeList = []Type{
+	TypeCargo,
 	TypeComposer,
 	TypeConan,
 	TypeConda,
@@ -64,6 +66,8 @@ var TypeList = []Type{
 // Name gets the name of the package type
 func (pt Type) Name() string {
 	switch pt {
+	case TypeCargo:
+		return "Cargo"
 	case TypeComposer:
 		return "Composer"
 	case TypeConan:
@@ -97,6 +101,8 @@ func (pt Type) Name() string {
 // SVGName gets the name of the package type svg image
 func (pt Type) SVGName() string {
 	switch pt {
+	case TypeCargo:
+		return "gitea-cargo"
 	case TypeComposer:
 		return "gitea-composer"
 	case TypeConan:

models/packages/package_property.go

@@ -58,6 +58,12 @@ func GetPropertiesByName(ctx context.Context, refType PropertyType, refID int64,
 	return pps, db.GetEngine(ctx).Where("ref_type = ? AND ref_id = ? AND name = ?", refType, refID, name).Find(&pps)
 }
 
+// UpdateProperty updates a property
+func UpdateProperty(ctx context.Context, pp *PackageProperty) error {
+	_, err := db.GetEngine(ctx).ID(pp.ID).Update(pp)
+	return err
+}
+
 // DeleteAllProperties deletes all properties of a ref
 func DeleteAllProperties(ctx context.Context, refType PropertyType, refID int64) error {
 	_, err := db.GetEngine(ctx).Where("ref_type = ? AND ref_id = ?", refType, refID).Delete(&PackageProperty{})