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// Copyright 2014 Docker, Inc.
//
// 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.
//
// Code forked from Docker project
package daemon
import (
"net"
"os"
)
// SdNotify sends a message to the init daemon. It is common to ignore the error.
// If `unsetEnvironment` is true, the environment variable `NOTIFY_SOCKET`
// will be unconditionally unset.
//
// It returns one of the following:
// (false, nil) - notification not supported (i.e. NOTIFY_SOCKET is unset)
// (false, err) - notification supported, but failure happened (e.g. error connecting to NOTIFY_SOCKET or while sending data)
// (true, nil) - notification supported, data has been sent
func SdNotify(unsetEnvironment bool, state string) (sent bool, err error) {
socketAddr := &net.UnixAddr{
Name: os.Getenv("NOTIFY_SOCKET"),
Net: "unixgram",
}
// NOTIFY_SOCKET not set
if socketAddr.Name == "" {
return false, nil
}
if unsetEnvironment {
err = os.Unsetenv("NOTIFY_SOCKET")
}
if err != nil {
return false, err
}
conn, err := net.DialUnix(socketAddr.Net, nil, socketAddr)
// Error connecting to NOTIFY_SOCKET
if err != nil {
return false, err
}
defer conn.Close()
_, err = conn.Write([]byte(state))
// Error sending the message
if err != nil {
return false, err
}
return true, nil
}
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