vendor/github.com/moby/buildkit/frontend/gateway/pb/caps.go

package moby_buildkit_v1_frontend

import "github.com/moby/buildkit/util/apicaps"

var Caps apicaps.CapList

// Every backwards or forwards non-compatible change needs to add a new capability row.
// By default new capabilities should be experimental. After merge a capability is
// considered immutable. After a capability is marked stable it should not be disabled.

const (
	CapSolveBase         apicaps.CapID = "solve.base"
	CapSolveInlineReturn apicaps.CapID = "solve.inlinereturn"
	CapResolveImage      apicaps.CapID = "resolveimage"
	CapReadFile          apicaps.CapID = "readfile"
	CapReturnResult      apicaps.CapID = "return"
	CapReturnMap         apicaps.CapID = "returnmap"
)

func init() {

	Caps.Init(apicaps.Cap{
		ID:      CapSolveBase,
		Enabled: true,
		Status:  apicaps.CapStatusExperimental,
	})

	Caps.Init(apicaps.Cap{
		ID:         CapSolveInlineReturn,
		Name:       "inline return from solve",
		Enabled:    true,
		Deprecated: true,
		Status:     apicaps.CapStatusExperimental,
	})

	Caps.Init(apicaps.Cap{
		ID:      CapResolveImage,
		Name:    "resolve remote image config",
		Enabled: true,
		Status:  apicaps.CapStatusExperimental,
	})

	Caps.Init(apicaps.Cap{
		ID:      CapReadFile,
		Name:    "read static file",
		Enabled: true,
		Status:  apicaps.CapStatusExperimental,
	})

	Caps.Init(apicaps.Cap{
		ID:      CapReturnResult,
		Name:    "return solve result",
		Enabled: true,
		Status:  apicaps.CapStatusExperimental,
	})

	Caps.Init(apicaps.Cap{
		ID:      CapReturnMap,
		Name:    "return reference map",
		Enabled: true,
		Status:  apicaps.CapStatusExperimental,
	})

}