log: fix enabling systemd logging when using --log-file

This also moves all the systemd logging decisions to fs/log

cmd/cmd.go

@@ -21,7 +21,6 @@ import (
 	"sync"
 	"time"
 
-	systemd "github.com/iguanesolutions/go-systemd/v5"
 	"github.com/pkg/errors"
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/accounting"
@@ -376,11 +375,6 @@ func StartStats() func() {
 func initConfig() {
 	ctx := context.Background()
 	ci := fs.GetConfig(ctx)
-	// Activate logger systemd support if systemd invocation ID is detected
-	_, sysdLaunch := systemd.GetInvocationID()
-	if sysdLaunch {
-		ci.LogSystemdSupport = true // used during fslog.InitLogging()
-	}
 
 	// Start the logger
 	fslog.InitLogging()
@@ -398,10 +392,8 @@ func initConfig() {
 	fs.Debugf("rclone", "Version %q starting with parameters %q", fs.Version, os.Args)
 
 	// Inform user about systemd log support now that we have a logger
-	if sysdLaunch {
-		fs.Debugf("rclone", "systemd logging support automatically activated")
-	} else if ci.LogSystemdSupport {
-		fs.Debugf("rclone", "systemd logging support manually activated")
+	if fslog.Opt.LogSystemdSupport {
+		fs.Debugf("rclone", "systemd logging support activated")
 	}
 
 	// Start the remote control server if configured

fs/config.go

@@ -43,7 +43,6 @@ var (
 type ConfigInfo struct {
 	LogLevel               LogLevel
 	StatsLogLevel          LogLevel
-	LogSystemdSupport      bool
 	UseJSONLog             bool
 	DryRun                 bool
 	Interactive            bool

fs/config/configflags/configflags.go

@@ -124,7 +124,6 @@ func AddFlags(ci *fs.ConfigInfo, flagSet *pflag.FlagSet) {
 	flags.StringArrayVarP(flagSet, &downloadHeaders, "header-download", "", nil, "Set HTTP header for download transactions")
 	flags.StringArrayVarP(flagSet, &headers, "header", "", nil, "Set HTTP header for all transactions")
 	flags.BoolVarP(flagSet, &ci.RefreshTimes, "refresh-times", "", ci.RefreshTimes, "Refresh the modtime of remote files.")
-	flags.BoolVarP(flagSet, &ci.LogSystemdSupport, "log-systemd", "", ci.LogSystemdSupport, "Activate systemd integration for the logger.")
 }
 
 // ParseHeaders converts the strings passed in via the header flags into HTTPOptions

fs/log.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"log"
 
-	sysdjournald "github.com/iguanesolutions/go-systemd/v5/journald"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -72,28 +71,7 @@ func (l *LogLevel) Type() string {
 
 // LogPrint sends the text to the logger of level
 var LogPrint = func(level LogLevel, text string) {
-	var prefix string
-	if GetConfig(context.TODO()).LogSystemdSupport {
-		switch level {
-		case LogLevelDebug:
-			prefix = sysdjournald.DebugPrefix
-		case LogLevelInfo:
-			prefix = sysdjournald.InfoPrefix
-		case LogLevelNotice:
-			prefix = sysdjournald.NoticePrefix
-		case LogLevelWarning:
-			prefix = sysdjournald.WarningPrefix
-		case LogLevelError:
-			prefix = sysdjournald.ErrPrefix
-		case LogLevelCritical:
-			prefix = sysdjournald.CritPrefix
-		case LogLevelAlert:
-			prefix = sysdjournald.AlertPrefix
-		case LogLevelEmergency:
-			prefix = sysdjournald.EmergPrefix
-		}
-	}
-	text = fmt.Sprintf("%s%-6s: %s", prefix, level, text)
+	text = fmt.Sprintf("%-6s: %s", level, text)
 	_ = log.Output(4, text)
 }
 

fs/log/log.go

@@ -3,6 +3,7 @@ package log
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"log"
 	"os"
@@ -10,16 +11,19 @@ import (
 	"runtime"
 	"strings"
 
+	systemd "github.com/iguanesolutions/go-systemd/v5"
+	sysdjournald "github.com/iguanesolutions/go-systemd/v5/journald"
 	"github.com/rclone/rclone/fs"
 	"github.com/sirupsen/logrus"
 )
 
-// Options contains options for the remote control server
+// Options contains options for controlling the logging
 type Options struct {
-	File           string // Log everything to this file
-	Format         string // Comma separated list of log format options
-	UseSyslog      bool   // Use Syslog for logging
-	SyslogFacility string // Facility for syslog, e.g. KERN,USER,...
+	File              string // Log everything to this file
+	Format            string // Comma separated list of log format options
+	UseSyslog         bool   // Use Syslog for logging
+	SyslogFacility    string // Facility for syslog, e.g. KERN,USER,...
+	LogSystemdSupport bool   // set if using systemd logging
 }
 
 // DefaultOpt is the default values used for Opt
@@ -91,19 +95,17 @@ func Stack(o interface{}, info string) {
 func InitLogging() {
 	flagsStr := "," + Opt.Format + ","
 	var flags int
-	if !fs.GetConfig(context.Background()).LogSystemdSupport {
-		if strings.Contains(flagsStr, ",date,") {
-			flags |= log.Ldate
-		}
-		if strings.Contains(flagsStr, ",time,") {
-			flags |= log.Ltime
-		}
-		if strings.Contains(flagsStr, ",microseconds,") {
-			flags |= log.Lmicroseconds
-		}
-		if strings.Contains(flagsStr, ",UTC,") {
-			flags |= log.LUTC
-		}
+	if strings.Contains(flagsStr, ",date,") {
+		flags |= log.Ldate
+	}
+	if strings.Contains(flagsStr, ",time,") {
+		flags |= log.Ltime
+	}
+	if strings.Contains(flagsStr, ",microseconds,") {
+		flags |= log.Lmicroseconds
+	}
+	if strings.Contains(flagsStr, ",UTC,") {
+		flags |= log.LUTC
 	}
 	if strings.Contains(flagsStr, ",longfile,") {
 		flags |= log.Llongfile
@@ -135,9 +137,46 @@ func InitLogging() {
 		}
 		startSysLog()
 	}
+
+	// Activate systemd logger support if systemd invocation ID is
+	// detected and output is going to stderr (not logging to a file or syslog)
+	if !Redirected() {
+		if _, usingSystemd := systemd.GetInvocationID(); usingSystemd {
+			Opt.LogSystemdSupport = true
+		}
+	}
+
+	// Systemd logging output
+	if Opt.LogSystemdSupport {
+		startSystemdLog()
+	}
 }
 
 // Redirected returns true if the log has been redirected from stdout
 func Redirected() bool {
 	return Opt.UseSyslog || Opt.File != ""
 }
+
+var logLevelToStringSystemd = []string{
+	fs.LogLevelEmergency: sysdjournald.EmergPrefix,
+	fs.LogLevelAlert:     sysdjournald.AlertPrefix,
+	fs.LogLevelCritical:  sysdjournald.CritPrefix,
+	fs.LogLevelError:     sysdjournald.ErrPrefix,
+	fs.LogLevelWarning:   sysdjournald.WarningPrefix,
+	fs.LogLevelNotice:    sysdjournald.NoticePrefix,
+	fs.LogLevelInfo:      sysdjournald.InfoPrefix,
+	fs.LogLevelDebug:     sysdjournald.DebugPrefix,
+}
+
+// Starts systemd logging
+func startSystemdLog() {
+	log.SetFlags(0)
+	fs.LogPrint = func(level fs.LogLevel, text string) {
+		var prefix string
+		if level < fs.LogLevel(len(logLevelToStringSystemd)) {
+			prefix = logLevelToStringSystemd[level]
+		}
+		text = fmt.Sprintf("%s%-6s: %s", prefix, level, text)
+		_ = log.Output(4, text)
+	}
+}

fs/log/logflags/logflags.go

@@ -16,4 +16,5 @@ func AddFlags(flagSet *pflag.FlagSet) {
 	flags.StringVarP(flagSet, &log.Opt.Format, "log-format", "", log.Opt.Format, "Comma separated list of log format options")
 	flags.BoolVarP(flagSet, &log.Opt.UseSyslog, "syslog", "", log.Opt.UseSyslog, "Use Syslog for logging")
 	flags.StringVarP(flagSet, &log.Opt.SyslogFacility, "syslog-facility", "", log.Opt.SyslogFacility, "Facility for syslog, e.g. KERN,USER,...")
+	flags.BoolVarP(flagSet, &log.Opt.LogSystemdSupport, "log-systemd", "", log.Opt.LogSystemdSupport, "Activate systemd integration for the logger.")
 }