don't print status info if running in the background

clean

fix OS issues & format code

fix issues

src/cmds/restic/background.go

@@ -0,0 +1,9 @@
+// +build !linux
+
+package main
+
+// IsProcessBackground should return true if it is running in the background or false if not
+func IsProcessBackground() bool {
+	//TODO: Check if the process are running in the background in other OS than linux
+	return false
+}

src/cmds/restic/background_linux.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"syscall"
+	"unsafe"
+
+	"restic/debug"
+)
+
+// IsProcessBackground returns true if it is running in the background or false if not
+func IsProcessBackground() bool {
+	var pid int
+	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(syscall.Stdin), syscall.TIOCGPGRP, uintptr(unsafe.Pointer(&pid)))
+
+	if err != 0 {
+		debug.Log("Can't check if we are in the background. Using default behaviour. Error: %s\n", err.Error())
+		return false
+	}
+
+	return pid != syscall.Getpgrp()
+}

src/cmds/restic/cmd_backup.go

@@ -71,8 +71,13 @@ func newScanProgress(gopts GlobalOptions) *restic.Progress {
 
 	p := restic.NewProgress()
 	p.OnUpdate = func(s restic.Stat, d time.Duration, ticker bool) {
+		if IsProcessBackground() {
+			return
+		}
+
 		PrintProgress("[%s] %d directories, %d files, %s", formatDuration(d), s.Dirs, s.Files, formatBytes(s.Bytes))
 	}
+
 	p.OnDone = func(s restic.Stat, d time.Duration, ticker bool) {
 		PrintProgress("scanned %d directories, %d files in %s\n", s.Dirs, s.Files, formatDuration(d))
 	}
@@ -91,6 +96,10 @@ func newArchiveProgress(gopts GlobalOptions, todo restic.Stat) *restic.Progress
 	itemsTodo := todo.Files + todo.Dirs
 
 	archiveProgress.OnUpdate = func(s restic.Stat, d time.Duration, ticker bool) {
+		if IsProcessBackground() {
+			return
+		}
+
 		sec := uint64(d / time.Second)
 		if todo.Bytes > 0 && sec > 0 && ticker {
 			bps = s.Bytes / sec
@@ -144,6 +153,10 @@ func newArchiveStdinProgress(gopts GlobalOptions) *restic.Progress {
 	var bps uint64
 
 	archiveProgress.OnUpdate = func(s restic.Stat, d time.Duration, ticker bool) {
+		if IsProcessBackground() {
+			return
+		}
+
 		sec := uint64(d / time.Second)
 		if s.Bytes > 0 && sec > 0 && ticker {
 			bps = s.Bytes / sec