Add Alpine package registry (#23714)

This PR adds an Alpine package registry. You can follow [this
tutorial](https://wiki.alpinelinux.org/wiki/Creating_an_Alpine_package)
to build a *.apk package for testing.

This functionality is similar to the Debian registry (#22854) and
therefore shares some methods. I marked this PR as blocked because it
should be merged after #22854.


![grafik](https://user-images.githubusercontent.com/1666336/227779595-b76163aa-eea1-4a79-9583-775c24ad74e8.png)

---------

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Giteabot <teabot@gitea.io>

1 files changed, 43 insertions, 0 deletions

diff --git a/services/packages/packages.go b/services/packages/packages.go
index 535f2fac8e..bf64890f4e 100644
--- a/services/packages/packages.go
+++ b/services/packages/packages.go
@@ -351,6 +351,8 @@ func CheckSizeQuotaExceeded(ctx context.Context, doer, owner *user_model.User, p
 
 	var typeSpecificSize int64
 	switch packageType {
+	case packages_model.TypeAlpine:
+		typeSpecificSize = setting.Packages.LimitSizeAlpine
 	case packages_model.TypeCargo:
 		typeSpecificSize = setting.Packages.LimitSizeCargo
 	case packages_model.TypeChef:
@@ -486,6 +488,47 @@ func RemovePackageVersion(doer *user_model.User, pv *packages_model.PackageVersi
 	return nil
 }
 
+// RemovePackageFileAndVersionIfUnreferenced deletes the package file and the version if there are no referenced files afterwards
+func RemovePackageFileAndVersionIfUnreferenced(doer *user_model.User, pf *packages_model.PackageFile) error {
+	var pd *packages_model.PackageDescriptor
+
+	if err := db.WithTx(db.DefaultContext, func(ctx context.Context) error {
+		if err := DeletePackageFile(ctx, pf); err != nil {
+			return err
+		}
+
+		has, err := packages_model.HasVersionFileReferences(ctx, pf.VersionID)
+		if err != nil {
+			return err
+		}
+		if !has {
+			pv, err := packages_model.GetVersionByID(ctx, pf.VersionID)
+			if err != nil {
+				return err
+			}
+
+			pd, err = packages_model.GetPackageDescriptor(ctx, pv)
+			if err != nil {
+				return err
+			}
+
+			if err := DeletePackageVersionAndReferences(ctx, pv); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	if pd != nil {
+		notification.NotifyPackageDelete(db.DefaultContext, doer, pd)
+	}
+
+	return nil
+}
+
 // DeletePackageVersionAndReferences deletes the package version and its properties and files
 func DeletePackageVersionAndReferences(ctx context.Context, pv *packages_model.PackageVersion) error {
 	if err := packages_model.DeleteAllProperties(ctx, packages_model.PropertyTypeVersion, pv.ID); err != nil {