Add some documentation to packages (#21648)

In #21637 it was mentioned that the purpose of the API routes for the
packages is unclear. This PR adds some documentation.

Fix #21637

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

routers/api/packages/api.go

@@ -40,7 +40,9 @@ func reqPackageAccess(accessMode perm.AccessMode) func(ctx *context.Context) {
 	}
 }
 
-func Routes(ctx gocontext.Context) *web.Route {
+// CommonRoutes provide endpoints for most package managers (except containers - see below)
+// These are mounted on `/api/packages` (not `/api/v1/packages`)
+func CommonRoutes(ctx gocontext.Context) *web.Route {
 	r := web.NewRoute()
 
 	r.Use(context.PackageContexter(ctx))
@@ -301,6 +303,9 @@ func Routes(ctx gocontext.Context) *web.Route {
 	return r
 }
 
+// ContainerRoutes provides endpoints that implement the OCI API to serve containers
+// These have to be mounted on `/v2/...` to comply with the OCI spec:
+// https://github.com/opencontainers/distribution-spec/blob/main/spec.md
 func ContainerRoutes(ctx gocontext.Context) *web.Route {
 	r := web.NewRoute()
 

routers/api/v1/api.go

@@ -1073,6 +1073,7 @@ func Routes(ctx gocontext.Context) *web.Route {
 			}, repoAssignment())
 		})
 
+		// NOTE: these are Gitea package management API - see packages.CommonRoutes and packages.DockerContainerRoutes for endpoints that implement package manager APIs
 		m.Group("/packages/{username}", func() {
 			m.Group("/{type}/{name}/{version}", func() {
 				m.Get("", packages.GetPackage)

routers/init.go

@@ -185,8 +185,14 @@ func NormalRoutes(ctx context.Context) *web.Route {
 	r.Mount("/", web_routers.Routes(ctx))
 	r.Mount("/api/v1", apiv1.Routes(ctx))
 	r.Mount("/api/internal", private.Routes())
+
 	if setting.Packages.Enabled {
-		r.Mount("/api/packages", packages_router.Routes(ctx))
+		// Add endpoints to match common package manager APIs
+
+		// This implements package support for most package managers
+		r.Mount("/api/packages", packages_router.CommonRoutes(ctx))
+
+		// This implements the OCI API (Note this is not preceded by /api but is instead /v2)
 		r.Mount("/v2", packages_router.ContainerRoutes(ctx))
 	}
 	return r