141 lines
3.2 KiB
Go
141 lines
3.2 KiB
Go
package main
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import "os"
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import "fmt"
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import "time"
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import "flag"
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import "os/exec"
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import "hnakra/cli"
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import "path/filepath"
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import "hnakra/cmd/hnctl/spawn"
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func main () {
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flag.Usage = func () {
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out := flag.CommandLine.Output()
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fmt.Fprintf(out, "Usage of %s:\n", os.Args[0])
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fmt.Fprintf(out, " start\n")
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fmt.Fprintf(out, " Start a service\n")
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fmt.Fprintf(out, " stop\n")
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fmt.Fprintf(out, " Stop a service\n")
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fmt.Fprintf(out, " restart\n")
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fmt.Fprintf(out, " Start and then stop a service\n")
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os.Exit(1)
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}
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// define commands
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startCommand := flag.NewFlagSet("start", flag.ExitOnError)
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startService := startCommand.String("s", "router", "Service to start")
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stopCommand := flag.NewFlagSet("stop", flag.ExitOnError)
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stopService := stopCommand.String("s", "router", "Service to stop")
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restartCommand := flag.NewFlagSet("restart", flag.ExitOnError)
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restartService := restartCommand.String("s", "router", "Service to restart")
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flag.Parse()
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// execute correct command
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if len(os.Args) < 2 {
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flag.Usage()
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os.Exit(1)
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}
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subCommandArgs := os.Args[2:]
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switch os.Args[1] {
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case "start":
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startCommand.Parse(subCommandArgs)
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execStart(*startService)
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case "stop":
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stopCommand.Parse(subCommandArgs)
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execStop(*stopService)
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case "restart":
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restartCommand.Parse(subCommandArgs)
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execStop(*restartService)
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execStart(*restartService)
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}
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}
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func execStart (service string) {
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fullName := cli.ServiceUser(service)
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cli.NeedRoot()
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pid, err := spawn.PidOf(fullName)
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if err == nil && spawn.Running(pid) {
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cli.Sayf("service is already running\n")
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return
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}
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uid, gid, err := cli.LookupUID(fullName)
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if err != nil {
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cli.Sayf("cannot start service: %v\n", err)
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os.Exit(1)
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}
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path, err := exec.LookPath(fullName)
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if err != nil {
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cli.Sayf("cannot start service: %v\n", err)
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os.Exit(1)
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}
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logDir := filepath.Join("/var/log/", fullName)
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env := append(os.Environ(), "HNAKRA_LOG_DIR=" + logDir)
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err = cli.MkdirFor(logDir, int(uid), int(gid))
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if err != nil {
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cli.Sayf("cannot start service: %v\n", err)
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os.Exit(1)
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}
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// prepare pidfile. the service will be responsible for actually writing
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// to it
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err = ensurePidFile(spawn.PidFile(fullName), int(uid), int(gid))
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if err != nil {
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cli.Sayf("cannot start service: %v\n", err)
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os.Exit(1)
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}
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// spawn the service
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pid, err = spawn.Spawn(path, uid, gid, env)
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if err != nil {
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cli.Sayf("cannot start service: %v\n", err)
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os.Exit(1)
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}
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fmt.Println(pid)
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}
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func execStop (service string) {
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fullName := cli.ServiceUser(service)
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cli.NeedRoot()
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pid, err := spawn.PidOf(fullName)
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if err != nil || !spawn.Running(pid) {
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cli.Sayf("service is not running\n")
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return
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}
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process, err := os.FindProcess(pid)
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if err != nil {
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cli.Sayf("service is not running\n")
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return
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}
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err = spawn.KillAndWait(process, 16 * time.Second)
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if err != nil {
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cli.Sayf("could not stop service: %v\n", err)
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os.Exit(1)
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}
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}
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func ensurePidFile (file string, uid, gid int) error {
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pidFile, err := os.Create(file)
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if err != nil { return err }
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err = pidFile.Close()
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if err != nil { return err }
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err = os.Chmod(file, 0660)
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if err != nil { return err }
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err = os.Chown(file, uid, gid)
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if err != nil { return err }
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return nil
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}
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