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Merge: Service: Support installation on OpenWrt

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Close #1348

Squashed commit of the following:

commit 87cca9129631350681ec77d1dee0781f0a237387
Merge: 313beee1 9b0096dd
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Jan 16 12:41:20 2020 +0300

    Merge remote-tracking branch 'origin/master' into 1348-openwrt

commit 313beee114e1daae8319192949b4db5fd8321df1
Merge: 16225231 e2f9e298
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Jan 16 12:01:21 2020 +0300

    Merge remote-tracking branch 'origin/master' into 1348-openwrt

commit 16225231bf3836fc6785ebefe44d239591b0485e
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Jan 16 11:59:59 2020 +0300

    minor

commit faca9821003334d2032ccec1010eb2acbac88743
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Jan 16 11:54:53 2020 +0300

    minor

commit 0e92ec123023cb6b81ef5cfd7e3ae454c3931980
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Wed Jan 15 14:03:40 2020 +0300

    minor

commit 3185b1d48f31a95857a27e8ed858443f977e97af
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Tue Jan 14 13:18:00 2020 +0300

    minor

commit 6bd6012d01ef55631215a5542630ccf92180739e
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Mon Jan 13 19:57:44 2020 +0300

    - service: fix installation on OpenWrt
This commit is contained in:
Simon Zolin 2020-01-16 12:44:06 +03:00
parent 9b0096dd9d
commit e398117d25
1 changed files with 178 additions and 6 deletions
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184
home/service.go
View file

@ -1,7 +1,9 @@
package home
import (
"fmt"
"os"
"os/exec"
"runtime"
"syscall"
@ -39,6 +41,47 @@ func (p *program) Stop(s service.Service) error {
return nil
}
func runCommand(command string, arguments ...string) (int, string, error) {
cmd := exec.Command(command, arguments...)
out, err := cmd.Output()
if err != nil {
return 1, "", fmt.Errorf("exec.Command(%s) failed: %s", command, err)
}
return cmd.ProcessState.ExitCode(), string(out), nil
}
// Check the service's status
// Note: on OpenWrt 'service' utility may not exist - we use our service script directly in this case.
func svcStatus(s service.Service) (service.Status, error) {
status, err := s.Status()
if err != nil && service.Platform() == "unix-systemv" {
confPath := "/etc/init.d/" + serviceName
code, _, err := runCommand("sh", "-c", confPath+" status")
if err != nil {
return service.StatusStopped, nil
}
if code != 0 {
return service.StatusStopped, nil
}
return service.StatusRunning, nil
}
return status, err
}
// Perform an action on the service
// Note: on OpenWrt 'service' utility may not exist - we use our service script directly in this case.
func svcAction(s service.Service, action string) error {
err := service.Control(s, action)
if err != nil && service.Platform() == "unix-systemv" &&
(action == "start" || action == "stop" || action == "restart") {
confPath := "/etc/init.d/" + serviceName
_, _, err := runCommand("sh", "-c", confPath+" "+action)
return err
}
return err
}
// handleServiceControlAction one of the possible control actions:
// install -- installs a service/daemon
// uninstall -- uninstalls it
@ -71,7 +114,7 @@ func handleServiceControlAction(action string) {
}
if action == "status" {
status, errSt := s.Status()
status, errSt := svcStatus(s)
if errSt != nil {
log.Fatalf("failed to get service status: %s", errSt)
}
@ -94,18 +137,23 @@ func handleServiceControlAction(action string) {
// In case of Windows and Linux when a running service is being uninstalled,
// it is just marked for deletion but not stopped
// So we explicitly stop it here
_ = s.Stop()
_ = svcAction(s, "stop")
}
err = service.Control(s, action)
err = svcAction(s, action)
if err != nil {
log.Fatal(err)
}
log.Printf("Action %s has been done successfully on %s", action, service.ChosenSystem().String())
if action == "install" {
err := afterInstall()
if err != nil {
log.Fatal(err)
}
// Start automatically after install
err = service.Control(s, "start")
err = svcAction(s, "start")
if err != nil {
log.Fatalf("Failed to start the service: %s", err)
}
@ -140,9 +188,23 @@ func configureService(c *service.Config) {
// Redirect StdErr & StdOut to files.
c.Option["LogOutput"] = true
// Add "After=" setting for systemd service file, because we must be started only after network is online
// Set "RestartSec" to 10
// Use modified service file templates
c.Option["SystemdScript"] = systemdScript
c.Option["SysvScript"] = sysvScript
}
// On SysV systems supported by kardianos/service package, there must be multiple /etc/rc{N}.d directories.
// On OpenWrt, however, there is only /etc/rc.d - we handle this case ourselves.
// We also use relative path, because this is how all other service files are set up.
func afterInstall() error {
if service.Platform() == "unix-systemv" && fileExists("/etc/rc.d") {
confPath := "../init.d/" + serviceName
err := os.Symlink(confPath, "/etc/rc.d/S99"+serviceName)
if err != nil {
return err
}
}
return nil
}
// cleanupService called on the service uninstall, cleans up additional files if needed
@ -158,6 +220,14 @@ func cleanupService() {
log.Printf("cannot remove %s", launchdStderrPath)
}
}
if service.Platform() == "unix-systemv" {
fn := "/etc/rc.d/S99" + serviceName
err := os.Remove(fn)
if err != nil && !os.IsNotExist(err) {
log.Printf("os.Remove: %s: %s", fn, err)
}
}
}
// Basically the same template as the one defined in github.com/kardianos/service
@ -191,6 +261,8 @@ var launchdConfig = `<?xml version='1.0' encoding='UTF-8'?>
`
// Note: we should keep it in sync with the template from service_systemd_linux.go file
// Add "After=" setting for systemd service file, because we must be started only after network is online
// Set "RestartSec" to 10
const systemdScript = `[Unit]
Description={{.Description}}
ConditionFileIsExecutable={{.Path|cmdEscape}}
@ -216,3 +288,103 @@ EnvironmentFile=-/etc/sysconfig/{{.Name}}
[Install]
WantedBy=multi-user.target
`
// Note: we should keep it in sync with the template from service_sysv_linux.go file
// Use "ps | grep -v grep | grep $(get_pid)" because "ps PID" may not work on OpenWrt
const sysvScript = `#!/bin/sh
# For RedHat and cousins:
# chkconfig: - 99 01
# description: {{.Description}}
# processname: {{.Path}}
### BEGIN INIT INFO
# Provides: {{.Path}}
# Required-Start:
# Required-Stop:
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: {{.DisplayName}}
# Description: {{.Description}}
### END INIT INFO
cmd="{{.Path}}{{range .Arguments}} {{.|cmd}}{{end}}"
name=$(basename $(readlink -f $0))
pid_file="/var/run/$name.pid"
stdout_log="/var/log/$name.log"
stderr_log="/var/log/$name.err"
[ -e /etc/sysconfig/$name ] && . /etc/sysconfig/$name
get_pid() {
cat "$pid_file"
}
is_running() {
[ -f "$pid_file" ] && ps | grep -v grep | grep $(get_pid) > /dev/null 2>&1
}
case "$1" in
start)
if is_running; then
echo "Already started"
else
echo "Starting $name"
{{if .WorkingDirectory}}cd '{{.WorkingDirectory}}'{{end}}
$cmd >> "$stdout_log" 2>> "$stderr_log" &
echo $! > "$pid_file"
if ! is_running; then
echo "Unable to start, see $stdout_log and $stderr_log"
exit 1
fi
fi
;;
stop)
if is_running; then
echo -n "Stopping $name.."
kill $(get_pid)
for i in $(seq 1 10)
do
if ! is_running; then
break
fi
echo -n "."
sleep 1
done
echo
if is_running; then
echo "Not stopped; may still be shutting down or shutdown may have failed"
exit 1
else
echo "Stopped"
if [ -f "$pid_file" ]; then
rm "$pid_file"
fi
fi
else
echo "Not running"
fi
;;
restart)
$0 stop
if is_running; then
echo "Unable to stop, will not attempt to start"
exit 1
fi
$0 start
;;
status)
if is_running; then
echo "Running"
else
echo "Stopped"
exit 1
fi
;;
*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
;;
esac
exit 0
`