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https://github.com/aptly-dev/aptly.git
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07cf8925f9
systemd has a feature called socket activation where initially systemd manages and listens on ports/uds and only invokes a service when traffic appears. to then hand over the involved sockets, systemd will pass the relevant FDs into the invoked process and defines them in the environment. use coreos/go-systemd to grab the active listeners passed by systemd and use them to serve the api routes. only one listener may be specified right now as we also only support one -listen argument for the binary. this allows admins to craft a systemd socket and service file for aptly where systemd manages the socket, its permission and its live time, and lazy start aptly when needed.
53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package activation implements primitives for systemd socket activation.
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package activation
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import (
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"os"
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"strconv"
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"syscall"
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)
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// based on: https://gist.github.com/alberts/4640792
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const (
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listenFdsStart = 3
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)
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func Files(unsetEnv bool) []*os.File {
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if unsetEnv {
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defer os.Unsetenv("LISTEN_PID")
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defer os.Unsetenv("LISTEN_FDS")
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}
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pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
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if err != nil || pid != os.Getpid() {
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return nil
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}
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nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
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if err != nil || nfds == 0 {
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return nil
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}
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files := make([]*os.File, 0, nfds)
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for fd := listenFdsStart; fd < listenFdsStart+nfds; fd++ {
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syscall.CloseOnExec(fd)
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files = append(files, os.NewFile(uintptr(fd), "LISTEN_FD_"+strconv.Itoa(fd)))
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}
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return files
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}
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