sys - add user check

sys/sys.go

@@ -8,6 +8,8 @@ import (
 	"os"
 	"os/exec"
 	"os/signal"
+	"os/user"
+	"strconv"
 	"strings"
 	"syscall"
 
@@ -187,3 +189,30 @@ func CheckSumFile(remoteChecksum string, path string) bool {
 	}
 	return checksum == remoteChecksum
 }
+
+func IsRootUser() bool {
+	done := false
+	if usr, err := user.Current(); err != nil {
+		done = usr.Uid == "0" && usr.HomeDir == "/root"
+	}
+	return done
+}
+
+func IsUser(name string) bool {
+	done := false
+	if usr, err := user.Current(); err != nil {
+		done = usr.Name == name
+	}
+	return done
+}
+
+func IsSystemUser(name string) bool {
+	done := false
+	if usr, err := user.Current(); err != nil {
+		var id int
+		if id, err = strconv.Atoi(usr.Uid); err != nil {
+			done = id < 1000
+		}
+	}
+	return done
+}