forked from containers/build
/
set-event-handlers.go
77 lines (68 loc) · 1.95 KB
/
set-event-handlers.go
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// Copyright 2015 The appc Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package lib
import (
"github.com/appc/acbuild/util"
"github.com/appc/spec/schema"
"github.com/appc/spec/schema/types"
)
const (
preStartName = "pre-start"
postStopName = "post-stop"
)
// SetPreStart sets the pre-start event handler in the expanded ACI stored at
// a.CurrentACIPath
func (a *ACBuild) SetPreStart(exec []string) error {
return a.setEventHandler(preStartName, exec)
}
// SetPostStop sets the post-stop event handler in the expanded ACI stored at
// a.CurrentACIPath
func (a *ACBuild) SetPostStop(exec []string) error {
return a.setEventHandler(postStopName, exec)
}
func (a *ACBuild) setEventHandler(name string, exec []string) (err error) {
if err = a.lock(); err != nil {
return err
}
defer func() {
if err1 := a.unlock(); err == nil {
err = err1
}
}()
fn := func(s *schema.ImageManifest) error {
removeEventHandler(name, s)
if s.App == nil {
s.App = newManifestApp()
}
s.App.EventHandlers = append(s.App.EventHandlers,
types.EventHandler{
Name: name,
Exec: exec,
})
return nil
}
return util.ModifyManifest(fn, a.CurrentACIPath)
}
func removeEventHandler(name string, s *schema.ImageManifest) {
if s.App == nil {
return
}
for i := len(s.App.EventHandlers) - 1; i >= 0; i-- {
if s.App.EventHandlers[i].Name == name {
s.App.EventHandlers = append(
s.App.EventHandlers[:i],
s.App.EventHandlers[i+1:]...)
}
}
}