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974dd3c7f8
It has all sorts of benefits due to the service manager being aware of the starting/running/stopping state, see systemd.service(5) On top of that, start-up errors are reported using STATUS= key, so they will be easier to see in the 'systemctl status' output.
110 lines
2.4 KiB
Go
110 lines
2.4 KiB
Go
//+build linux
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package maddy
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import (
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"errors"
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"fmt"
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"io"
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"net"
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"os"
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"strings"
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"syscall"
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"github.com/foxcpp/maddy/log"
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)
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type SDStatus string
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const (
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SDReady = "READY=1"
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SDStopping = "STOPPING=1"
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)
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var (
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ErrNoNotifySock = errors.New("no systemd socket")
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)
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func sdNotifySock() (*net.UnixConn, error) {
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sockAddr := os.Getenv("NOTIFY_SOCKET")
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if sockAddr == "" {
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return nil, ErrNoNotifySock
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}
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if strings.HasPrefix(sockAddr, "@") {
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sockAddr = "\x00" + sockAddr[1:]
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}
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return net.DialUnix("unixgram", nil, &net.UnixAddr{
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Name: sockAddr,
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Net: "unixgram",
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})
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}
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func setScmPassCred(sock *net.UnixConn) error {
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sConn, err := sock.SyscallConn()
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if err != nil {
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return err
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}
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if err := sConn.Control(func(fd uintptr) {
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syscall.SetsockoptByte(int(fd), syscall.SOL_SOCKET, syscall.SO_PASSCRED, 1)
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}); err != nil {
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return err
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}
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return nil
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}
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func systemdStatus(status SDStatus, desc string) {
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sock, err := sdNotifySock()
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if err != nil {
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if err != ErrNoNotifySock {
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log.Println("systemd: failed to acquire notify socket:", err)
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}
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return
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}
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defer sock.Close()
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if err := setScmPassCred(sock); err != nil {
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log.Println("failed to set SCM_PASSCRED on the socket for communication with systemd:", err)
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}
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if desc != "" {
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if _, err := io.WriteString(sock, fmt.Sprintf("%s\nSTATUS=%s", status, desc)); err != nil {
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log.Println("systemd: I/O error:", err)
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}
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log.Debugf(`systemd: %s STATUS="%s"`, status, desc)
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} else {
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if _, err := io.WriteString(sock, string(status)); err != nil {
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log.Println("systemd: I/O error:", err)
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}
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log.Debugf(`systemd: %s`, status)
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}
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}
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func systemdStatusErr(reportedErr error) {
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sock, err := sdNotifySock()
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if err != nil {
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if err != ErrNoNotifySock {
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log.Println("systemd: failed to acquire notify socket:", err)
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}
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return
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}
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defer sock.Close()
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if err := setScmPassCred(sock); err != nil {
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log.Println("systemd: failed to set SCM_PASSCRED on the socket:", err)
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}
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var errno syscall.Errno
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if errors.As(reportedErr, &errno) {
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log.Debugf(`systemd: ERRNO=%d STATUS="%v"`, errno, reportedErr)
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if _, err := io.WriteString(sock, fmt.Sprintf("ERRNO=%d\nSTATUS=%v", errno, reportedErr)); err != nil {
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log.Println("systemd: I/O error:", err)
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}
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return
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}
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if _, err := io.WriteString(sock, fmt.Sprintf("STATUS=%v\n", reportedErr)); err != nil {
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log.Println("systemd: I/O error:", err)
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}
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log.Debugf(`systemd: STATUS="%v"`, reportedErr)
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}
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