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// Copyright 2024 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
//go:build !kustomize_disable_go_plugin_support
package loader
import (
"fmt"
"log"
"plugin"
"reflect"
"sigs.k8s.io/kustomize/api/internal/plugins/utils"
"sigs.k8s.io/kustomize/api/konfig"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/kyaml/errors"
"sigs.k8s.io/kustomize/kyaml/resid"
)
// registry is a means to avoid trying to load the same .so file
// into memory more than once, which results in an error.
// Each test makes its own loader, and tries to load its own plugins,
// but the loaded .so files are in shared memory, so one will get
// "this plugin already loaded" errors if the registry is maintained
// as a Loader instance variable. So make it a package variable.
var registry = make(map[string]resmap.Configurable) //nolint:gochecknoglobals
func copyPlugin(c resmap.Configurable) resmap.Configurable {
indirect := reflect.Indirect(reflect.ValueOf(c))
newIndirect := reflect.New(indirect.Type())
newIndirect.Elem().Set(reflect.ValueOf(indirect.Interface()))
newNamed := newIndirect.Interface()
return newNamed.(resmap.Configurable) //nolint:forcetypeassert
}
func (l *Loader) loadGoPlugin(id resid.ResId, absPath string) (resmap.Configurable, error) {
regId := relativePluginPath(id)
if c, ok := registry[regId]; ok {
return copyPlugin(c), nil
}
if !utils.FileExists(absPath) {
return nil, fmt.Errorf(
"expected file with Go object code at: %s", absPath)
}
log.Printf("Attempting plugin load from %q", absPath)
p, err := plugin.Open(absPath)
if err != nil {
return nil, errors.WrapPrefixf(err, "plugin %s fails to load", absPath)
}
symbol, err := p.Lookup(konfig.PluginSymbol)
if err != nil {
return nil, errors.WrapPrefixf(
err, "plugin %s doesn't have symbol %s",
regId, konfig.PluginSymbol)
}
c, ok := symbol.(resmap.Configurable)
if !ok {
return nil, fmt.Errorf("plugin %q not configurable", regId)
}
registry[regId] = c
return copyPlugin(c), nil
}
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