在 kafka 的服务脚本中看到了 daemon

时间：12-14来源：作者：点击数：1

/etc/init.d/functions 是 redhat 发行版中包含的，来源

# detect the distribution:
if [ -f /etc/redhat-release -o -f /etc/fedora-release ] ; then
  DISTRIBUTION="redhat"
elif [ -f /etc/SuSE-release ] ; then
  DISTRIBUTION="suse"
elif [ -f /etc/debian_version ] ; then
  DISTRIBUTION="debian"
else
  DISTRIBUTION="debian"
fi

# Source function library.
[ "$DISTRIBUTION" = "redhat" ] && . /etc/init.d/functions
[ "$DISTRIBUTION" = "suse" ] && . /etc/rc.status

学习 daemon

functions 文件详细分析和说明，/etc/rc.d/init.d/functions 几乎被 /etc/rc.d/init.d/ 下所有的 Sysv 服务启动脚本加载，也是学习 shell 脚本时一个非常不错的材料，在其中使用了不少技巧。

在该文件中提供了几个有用的函数：

daemon：启动一个服务程序。启动前还检查进程是否已在运行。
killproc：杀掉给定的服务进程。
status：检查给定进程的运行状态。
success：显示绿色的"OK"，表示成功。
failure：显示红色的"FAILED"，表示失败。
passed：显示绿色的"PASSED"，表示pass该任务。
warning：显示绿色的"warning"，表示警告。
action：根据进程退出状态码自行判断是执行success还是failure。
confirm：提示"(Y)es/(N)o/(C)ontinue? [Y]"并判断、传递输入的值。
is_true："$1"的布尔值代表为真时，返回状态码0，否则返回1。包括t、y、yes和true，不区分大小写。
is_false："$1"的布尔值代表为假时，返回状态码0。否则返回1。包括f、n、no和false，不区分大小写。
checkpid：检查/proc下是否有给定pid对应的目录。给定多个pid时，只要存在一个目录都返回状态码0。
__pids_var_run：检查pid是否存在，并保存到变量pid中，同时返回几种进程状态码。是functions中重要函数之一。
__pids_pidof：获取进程pid。
pidfileofproc：获取进程的pid。但只能获取/var/run下的pid文件中的值。
pidofproc：获取进程的pid。可获取任意给定pidfile或默认/var/run下pidfile中的值。

重头戏一：daemon 函数

daemon 函数用于启动一个程序，并根据结果输出 success 或 failure，定义语句如下：

# A function to start a program.
daemon() {
  # Test syntax.
  local gotbase= force= nicelevel corelimit  # 定义一大堆变量
  local pid base= user= nice= bg= pid_file=
  local cgroup=
  nicelevel=0
  while [ "$1" != "${1##[-+]}" ]; do   # 当参数$1以"-"或"+"开头时进入循环，但$1为空时也满足
    case $1 in
    '')  echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
         return 1;;
    --check)         # daemon接受"--arg value"和"--arg=value"两种格式的参数
       base=$2
       gotbase="yes"
       shift 2
       ;;
    --check=?*)
         base=${1#--check=}
       gotbase="yes"
       shift
       ;;
    --user)
       user=$2
       shift 2
       ;;
    --user=?*)
         user=${1#--user=}
       shift
       ;;
    --pidfile)
       pid_file=$2
       shift 2
       ;;
    --pidfile=?*)
       pid_file=${1#--pidfile=}
       shift
       ;;
    --force)
         force="force"
       shift
       ;;
    [-+][0-9]*)
         nice="nice -n $1"
         shift
       ;;
    *)   echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
         return 1;;
    esac
  done

    # Save basename.
    [ -z "$gotbase" ] && base=${1##*/}   # 若未传递"--check"，则此处获取bashname

    # See if it's already running. Look *only* at the pid file.
  __pids_var_run "$base" "$pid_file"

  [ -n "$pid" -a -z "$force" ] && return  # 如进程已在运行(已检测出pid)，且没有使用force
                        # 强制启动，则退出daemon函数

  # make sure it doesn't core dump anywhere unless requested   
  corelimit="ulimit -S -c ${DAEMON_COREFILE_LIMIT:-0}"  # corelimit、cgroup和资源控制有关，忽略它

  # if they set NICELEVEL in /etc/sysconfig/foo, honor it
  [ -n "${NICELEVEL:-}" ] && nice="nice -n $NICELEVEL"

  # if they set CGROUP_DAEMON in /etc/sysconfig/foo, honor it
  if [ -n "${CGROUP_DAEMON}" ]; then
    if [ ! -x /bin/cgexec ]; then
      echo -n "Cgroups not installed"; warning
      echo
    else
      cgroup="/bin/cgexec";
      for i in $CGROUP_DAEMON; do
        cgroup="$cgroup -g $i";
      done
    fi
  fi

  # Echo daemon
    [ "${BOOTUP:-}" = "verbose" -a -z "${LSB:-}" ] && echo -n " $base"

  # And start it up.    # 启动程序。runuser的"-s"指定执行程序的shell，$user指定运行的身份
              # "$*"是剔除掉daemon选项后程序的启动指令。
  if [ -z "$user" ]; then
     $cgroup $nice /bin/bash -c "$corelimit >/dev/null 2>&1 ; $*"
  else
     $cgroup $nice runuser -s /bin/bash $user -c "$corelimit >/dev/null 2>&1 ; $*"
  fi

  [ "$?" -eq 0 ] && success $"$base startup" || failure $"$base startup"
}

daemon 函数调用方法：

daemon [--check=servicename] [--user=USER] [--pidfile=PIDFILE] [--force] program [prog_args]

需要注意的是：

只有 --user 可以用来控制 program 启动的环境。
--check 和 --pidfile 都是用来检查是否已运行的，不是用来启动的，如果提供了 --check，则检查的是名为 servicename 的进程，否则检查的是 program 名称的进程。
--force 则表示进程已存在时仍启动。
prog_args 是向 program 传递它的运行参数，一般会从 /etc/sysconfig/$base 文件中获取。

例如 httpd 的启动脚本中。

echo -n $"Starting $prog: "
daemon --pidfile=${pidfile} $httpd $OPTIONS

这样的语句的执行结果大致如下：

[root@xuexi ~]# service httpd start
Starting httpd:              [  OK  ]

还需注意，通常 program 的运行参数可能也是 -- 开头的，要和 program 前面的选项区分。例如：

daemon --pidfile $pidfile --check $servicename $processname --pid-file=$pidfile

第二个 --pid-file 是 $processname 的运行参数，第一个 --pidfile 是 daemon 检测 $processname 是否已运行的选项。由于提供了 --check $servicename，所以函数调用语句 __pids_var_run $base [pidfile] 中的 $base 等于 $servicename，即表示检查 $servicename 进程是否允许。如果没有提供该选项，则检查的是 $processname。

至此，daemon 函数已经分析完成。实际上很简单，就是为 daemon 提供几个选项，再提供要执行的命令，并为该命令提供启动参数。

自己的练习

daemon 启动的进程，就是后台进程，而且杀掉后，还会被重启，跟系统服务是一样的。

[root@localhost bingoohuang]# daemon
bash: daemon: command not found...
[root@localhost bingoohuang]# . /etc/rc.d/init.d/functions
[root@localhost bingoohuang]# daemon
[root@localhost bingoohuang]#                [  OK  ]
[root@localhost bingoohuang]# daemon   --aaa
-bash: Usage: daemon [+/-nicelevel] {program} [arg1]...
[root@localhost bingoohuang]# daemon  --user=mysql sha1sum /dev/zero &
[1] 9145
[root@localhost bingoohuang]# ps -ef|grep sha1sum
mysql   9135   1 99 19:37 ?    00:00:30 sha1sum /dev/zero
root    9148  9145  0 19:37 pts/1  00:00:00 runuser -s /bin/bash mysql -c ulimit -S -c 0 >/dev/null 2>&1 ; sha1sum /dev/zero
mysql   9149  9148  0 19:37 ?    00:00:00 bash -c ulimit -S -c 0 >/dev/null 2>&1 ; sha1sum /dev/zero
mysql   9150  9149 99 19:37 ?    00:00:11 sha1sum /dev/zero
root    9153  8818  0 19:37 pts/1  00:00:00 grep --color=auto sha1sum
[root@localhost bingoohuang]# exit
logout
➜  centos bssh -H t
Select Server :t
Last login: Tue Jan 14 19:16:45 2020 from 192.168.217.48
[root@localhost ~]# ps -ef|grep sha1sum
mysql   9135   1 99 19:37 ?    00:00:57 sha1sum /dev/zero
root    9148  9145  0 19:37 ?    00:00:00 runuser -s /bin/bash mysql -c ulimit -S -c 0 >/dev/null 2>&1 ; sha1sum /dev/zero
mysql   9149  9148  0 19:37 ?    00:00:00 bash -c ulimit -S -c 0 >/dev/null 2>&1 ; sha1sum /dev/zero
mysql   9150  9149 99 19:37 ?    00:00:38 sha1sum /dev/zero
root    9213  9163  0 19:38 pts/2  00:00:00 grep --color=auto sha1sum
[root@localhost ~]# kill -9 9135
[root@localhost ~]# ps -ef|grep sha1sum
root    9148  9145  0 19:37 ?    00:00:00 runuser -s /bin/bash mysql -c ulimit -S -c 0 >/dev/null 2>&1 ; sha1sum /dev/zero
mysql   9149  9148  0 19:37 ?    00:00:00 bash -c ulimit -S -c 0 >/dev/null 2>&1 ; sha1sum /dev/zero
mysql   9150  9149 99 19:37 ?    00:00:47 sha1sum /dev/zero
root    9215  9163  0 19:38 pts/2  00:00:00 grep --color=auto sha1sum
[root@localhost ~]# ps -ef|grep ^C
[root@localhost ~]# kill -9 9148 9149 9150
[root@localhost ~]#
[root@localhost ~]# ps -ef|grep sha1sum
root    9233  9163  0 19:38 pts/2  00:00:00 grep --color=auto sha1sum

more /etc/rc.d/init.d/functions

# -*-Shell-script-*-
#
# functions This file contains functions to be used by most or all
#     shell scripts in the /etc/init.d directory.
#

TEXTDOMAIN=initscripts

# Make sure umask is sane
umask 022

# Set up a default search path.
PATH="/sbin:/usr/sbin:/bin:/usr/bin"
export PATH

if [ $PPID -ne 1 -a -z "$SYSTEMCTL_SKIP_REDIRECT" ] && \
    [ -d /run/systemd/system ] ; then
  case "$0" in
  /etc/init.d/*|/etc/rc.d/init.d/*)
    _use_systemctl=1
    ;;
  esac
fi

systemctl_redirect () {
  local s
  local prog=${1##*/}
  local command=$2
  local options=""

  case "$command" in
  start)
    s=$"Starting $prog (via systemctl): "
    ;;
  stop)
    s=$"Stopping $prog (via systemctl): "
    ;;
  reload|try-reload)
    s=$"Reloading $prog configuration (via systemctl): "
    ;;
  restart|try-restart|condrestart)
    s=$"Restarting $prog (via systemctl): "
    ;;
  esac

  if [ -n "$SYSTEMCTL_IGNORE_DEPENDENCIES" ] ; then
    options="--ignore-dependencies"
  fi

  if ! systemctl show "$prog.service" > /dev/null 2>&1 || \
      systemctl show -p LoadState "$prog.service" | grep -q 'not-found' ; then
    action $"Reloading systemd: " /bin/systemctl daemon-reload
  fi

  action "$s" /bin/systemctl $options $command "$prog.service"
}

# Get a sane screen width
[ -z "${COLUMNS:-}" ] && COLUMNS=80

if [ -z "${CONSOLETYPE:-}" ]; then
  if [ -c "/dev/stderr" -a -r "/dev/stderr" ]; then
    CONSOLETYPE="$(/sbin/consoletype < /dev/stderr 2>/dev/null)"
  else
    CONSOLETYPE="serial"
  fi
fi

if [ -z "${NOLOCALE:-}" ] && [ -z "${LANGSH_SOURCED:-}" ] && \
    [ -f /etc/sysconfig/i18n -o -f /etc/locale.conf ] ; then
  . /etc/profile.d/lang.sh 2>/dev/null
  # avoid propagating LANGSH_SOURCED any further
  unset LANGSH_SOURCED
fi

# Read in our configuration
if [ -z "${BOOTUP:-}" ]; then
  if [ -f /etc/sysconfig/init ]; then
    . /etc/sysconfig/init
  else
    # This all seem confusing? Look in /etc/sysconfig/init,
    # or in /usr/share/doc/initscripts-*/sysconfig.txt
    BOOTUP=color
    RES_COL=60
    MOVE_TO_COL="echo -en \\033[${RES_COL}G"
    SETCOLOR_SUCCESS="echo -en \\033[1;32m"
    SETCOLOR_FAILURE="echo -en \\033[1;31m"
    SETCOLOR_WARNING="echo -en \\033[1;33m"
    SETCOLOR_NORMAL="echo -en \\033[0;39m"
    LOGLEVEL=1
  fi
  if [ "$CONSOLETYPE" = "serial" ]; then
    BOOTUP=serial
    MOVE_TO_COL=
    SETCOLOR_SUCCESS=
    SETCOLOR_FAILURE=
    SETCOLOR_WARNING=
    SETCOLOR_NORMAL=
  fi
fi

# Check if any of $pid (could be plural) are running
checkpid() {
  local i

  for i in $* ; do
    [ -d "/proc/$i" ] && return 0
  done
  return 1
}

__kill_pids_term_kill_checkpids() {
  local base_stime=$1
  shift 1
  local pid=
  local pids=$*
  local remaining=
  local stat=
  local stime=

  for pid in $pids ; do
    [ ! -e  "/proc/$pid" ] && continue
    read -r line < "/proc/$pid/stat" 2> /dev/null

    stat=($line)
    stime=${stat[21]}

    [ -n "$stime" ] && [ "$base_stime" -lt "$stime" ] && continue
    remaining+="$pid "
  done

  echo "$remaining"
  [ -n "$remaining" ] && return 1

  return 0
}

__kill_pids_term_kill() {
  local try=0
  local delay=3;
  local pid=
  local stat=($(< /proc/self/stat))
  local base_stime=${stat[21]}

  if [ "$1" = "-d" ]; then
    delay=$2
    shift 2
  fi

  local kill_list=$*

  kill_list=$(__kill_pids_term_kill_checkpids $base_stime $kill_list)

  [ -z "$kill_list" ] && return 0

  kill -TERM $kill_list >/dev/null 2>&1
  sleep 0.1

  kill_list=$(__kill_pids_term_kill_checkpids $base_stime $kill_list)
  if [ -n "$kill_list" ] ; then
    while [ $try -lt $delay ] ; do
      sleep 1
      kill_list=$(__kill_pids_term_kill_checkpids $base_stime $kill_list)
      [ -z "$kill_list" ] && break
      let try+=1
    done
    if [ -n "$kill_list" ] ; then
      kill -KILL $kill_list >/dev/null 2>&1
      sleep 0.1
      kill_list=$(__kill_pids_term_kill_checkpids $base_stime $kill_list)
    fi
  fi

  [ -n "$kill_list" ] && return 1
  return 0
}

# __proc_pids {program} [pidfile]
# Set $pid to pids from /var/run* for {program}.  $pid should be declared
# local in the caller.
# Returns LSB exit code for the 'status' action.
__pids_var_run() {
  local base=${1##*/}
  local pid_file=${2:-/var/run/$base.pid}
  local pid_dir=$(/usr/bin/dirname $pid_file > /dev/null)
  local binary=$3

  [ -d "$pid_dir" -a ! -r "$pid_dir" ] && return 4

  pid=
  if [ -f "$pid_file" ] ; then
      local line p

    [ ! -r "$pid_file" ] && return 4 # "user had insufficient privilege"
    while : ; do
      read line
      [ -z "$line" ] && break
      for p in $line ; do
        if [ -z "${p//[0-9]/}" ] && [ -d "/proc/$p" ] ; then
          if [ -n "$binary" ] ; then
            local b=$(readlink /proc/$p/exe | sed -e 's/\s*(deleted)$//')
            [ "$b" != "$binary" ] && continue
          fi
          pid="$pid $p"
        fi
      done
    done < "$pid_file"

      if [ -n "$pid" ]; then
          return 0
      fi
    return 1 # "Program is dead and /var/run pid file exists"
  fi
  return 3 # "Program is not running"
}

# Output PIDs of matching processes, found using pidof
__pids_pidof() {
  pidof -c -m -o $ -o $PPID -o %PPID -x "$1" || \
    pidof -c -m -o $ -o $PPID -o %PPID -x "${1##*/}"
}


# A function to start a program.
daemon() {
  # Test syntax.
  local gotbase= force= nicelevel corelimit
  local pid base= user= nice= bg= pid_file=
  local cgroup=
  nicelevel=0
  while [ "$1" != "${1##[-+]}" ]; do
    case $1 in
    '')
      echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
      return 1
      ;;
    --check)
      base=$2
      gotbase="yes"
      shift 2
      ;;
    --check=?*)
      base=${1#--check=}
      gotbase="yes"
      shift
      ;;
    --user)
      user=$2
      shift 2
      ;;
    --user=?*)
      user=${1#--user=}
      shift
      ;;
    --pidfile)
      pid_file=$2
      shift 2
      ;;
    --pidfile=?*)
      pid_file=${1#--pidfile=}
      shift
      ;;
    --force)
      force="force"
      shift
      ;;
    [-+][0-9]*)
      nice="nice -n $1"
      shift
      ;;
    *)
      echo $"$0: Usage: daemon [+/-nicelevel] {program}" "[arg1]..."
      return 1
      ;;
    esac
  done

  # Save basename.
  [ -z "$gotbase" ] && base=${1##*/}

  # See if it's already running. Look *only* at the pid file.
  __pids_var_run "$base" "$pid_file"

  [ -n "$pid" -a -z "$force" ] && return

  # make sure it doesn't core dump anywhere unless requested
  corelimit="ulimit -S -c ${DAEMON_COREFILE_LIMIT:-0}"

  # if they set NICELEVEL in /etc/sysconfig/foo, honor it
  [ -n "${NICELEVEL:-}" ] && nice="nice -n $NICELEVEL"

  # if they set CGROUP_DAEMON in /etc/sysconfig/foo, honor it
  if [ -n "${CGROUP_DAEMON}" ]; then
    if [ ! -x /bin/cgexec ]; then
      echo -n "Cgroups not installed"; warning
      echo
    else
      cgroup="/bin/cgexec";
      for i in $CGROUP_DAEMON; do
        cgroup="$cgroup -g $i";
      done
    fi
  fi

  # Echo daemon
  [ "${BOOTUP:-}" = "verbose" -a -z "${LSB:-}" ] && echo -n " $base"

  # And start it up.
  if [ -z "$user" ]; then
     $cgroup $nice /bin/bash -c "$corelimit >/dev/null 2>&1 ; $*"
  else
     $cgroup $nice runuser -s /bin/bash $user -c "$corelimit >/dev/null 2>&1 ; $*"
  fi

  [ "$?" -eq 0 ] && success $"$base startup" || failure $"$base startup"
}

# A function to stop a program.
killproc() {
  local RC killlevel= base pid pid_file= delay try binary=

  RC=0; delay=3; try=0
  # Test syntax.
  if [ "$#" -eq 0 ]; then
    echo $"Usage: killproc [-p pidfile] [ -d delay] {program} [-signal]"
    return 1
  fi
  if [ "$1" = "-p" ]; then
    pid_file=$2
    shift 2
  fi
  if [ "$1" = "-b" ]; then
    if [ -z $pid_file ]; then
      echo $"-b option can be used only with -p"
      echo $"Usage: killproc -p pidfile -b binary program"
      return 1
    fi
    binary=$2
    shift 2
  fi
  if [ "$1" = "-d" ]; then
    delay=$(echo $2 | awk -v RS=' ' -v IGNORECASE=1 '{if($1!~/^[0-9.]+[smhd]?$/) exit 1;d=$1~/s$|^[0-9.]*$/?1:$1~/m$/?60:$1~/h$/?60*60:$1~/d
$/?24*60*60:-1;if(d==-1) exit 1;delay+=d*$1} END {printf("%d",delay+0.5)}')
    if [ "$?" -eq 1 ]; then
      echo $"Usage: killproc [-p pidfile] [ -d delay] {program} [-signal]"
      return 1
    fi
    shift 2
  fi


  # check for second arg to be kill level
  [ -n "${2:-}" ] && killlevel=$2

  # Save basename.
  base=${1##*/}

  # Find pid.
  __pids_var_run "$1" "$pid_file" "$binary"
  RC=$?
  if [ -z "$pid" ]; then
    if [ -z "$pid_file" ]; then
      pid="$(__pids_pidof "$1")"
    else
      [ "$RC" = "4" ] && { failure $"$base shutdown" ; return $RC ;}
    fi
  fi

  # Kill it.
  if [ -n "$pid" ] ; then
    [ "$BOOTUP" = "verbose" -a -z "${LSB:-}" ] && echo -n "$base "
    if [ -z "$killlevel" ] ; then
      __kill_pids_term_kill -d $delay $pid
      RC=$?
      [ "$RC" -eq 0 ] && success $"$base shutdown" || failure $"$base shutdown"
    # use specified level only
    else
      if checkpid $pid; then
        kill $killlevel $pid >/dev/null 2>&1
        RC=$?
        [ "$RC" -eq 0 ] && success $"$base $killlevel" || failure $"$base $killlevel"
      elif [ -n "${LSB:-}" ]; then
        RC=7 # Program is not running
      fi
    fi
  else
    if [ -n "${LSB:-}" -a -n "$killlevel" ]; then
      RC=7 # Program is not running
    else
      failure $"$base shutdown"
      RC=0
    fi
  fi

  # Remove pid file if any.
  if [ -z "$killlevel" ]; then
    rm -f "${pid_file:-/var/run/$base.pid}"
  fi
  return $RC
}

# A function to find the pid of a program. Looks *only* at the pidfile
pidfileofproc() {
  local pid

  # Test syntax.
  if [ "$#" = 0 ] ; then
    echo $"Usage: pidfileofproc {program}"
    return 1
  fi

  __pids_var_run "$1"
  [ -n "$pid" ] && echo $pid
  return 0
}

# A function to find the pid of a program.
pidofproc() {
  local RC pid pid_file=

  # Test syntax.
  if [ "$#" = 0 ]; then
    echo $"Usage: pidofproc [-p pidfile] {program}"
    return 1
  fi
  if [ "$1" = "-p" ]; then
    pid_file=$2
    shift 2
  fi
  fail_code=3 # "Program is not running"

  # First try "/var/run/*.pid" files
  __pids_var_run "$1" "$pid_file"
  RC=$?
  if [ -n "$pid" ]; then
    echo $pid
    return 0
  fi

  [ -n "$pid_file" ] && return $RC
  __pids_pidof "$1" || return $RC
}

status() {
  local base pid lock_file= pid_file= binary=

  # Test syntax.
  if [ "$#" = 0 ] ; then
    echo $"Usage: status [-p pidfile] {program}"
    return 1
  fi
  if [ "$1" = "-p" ]; then
    pid_file=$2
    shift 2
  fi
  if [ "$1" = "-l" ]; then
    lock_file=$2
    shift 2
  fi
  if [ "$1" = "-b" ]; then
    if [ -z $pid_file ]; then
      echo $"-b option can be used only with -p"
      echo $"Usage: status -p pidfile -b binary program"
      return 1
    fi
    binary=$2
    shift 2
  fi
  base=${1##*/}

  if [ "$_use_systemctl" = "1" ]; then
    systemctl status ${0##*/}.service
    ret=$?
    # LSB daemons that dies abnormally in systemd looks alive in systemd's eyes due to RemainAfterExit=yes
    # lets adjust the reality a little bit
    if systemctl show -p ActiveState ${0##*/}.service | grep -q '=active
 && \
    systemctl show -p SubState ${0##*/}.service | grep -q '=exited
 ; then
      ret=3
    fi
    return $ret
  fi

  # First try "pidof"
  __pids_var_run "$1" "$pid_file" "$binary"
  RC=$?
  if [ -z "$pid_file" -a -z "$pid" ]; then
    pid="$(__pids_pidof "$1")"
  fi
  if [ -n "$pid" ]; then
    echo $"${base} (pid $pid) is running..."
    return 0
  fi

  case "$RC" in
  0)
    echo $"${base} (pid $pid) is running..."
    return 0
    ;;
  1)
    echo $"${base} dead but pid file exists"
    return 1
    ;;
  4)
    echo $"${base} status unknown due to insufficient privileges."
    return 4
    ;;
  esac
  if [ -z "${lock_file}" ]; then
    lock_file=${base}
  fi
  # See if /var/lock/subsys/${lock_file} exists
  if [ -f /var/lock/subsys/${lock_file} ]; then
    echo $"${base} dead but subsys locked"
    return 2
  fi
  echo $"${base} is stopped"
  return 3
}

echo_success() {
  [ "$BOOTUP" = "color" ] && $MOVE_TO_COL
  echo -n "["
  [ "$BOOTUP" = "color" ] && $SETCOLOR_SUCCESS
  echo -n $"  OK  "
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "]"
  echo -ne "\r"
  return 0
}

echo_failure() {
  [ "$BOOTUP" = "color" ] && $MOVE_TO_COL
  echo -n "["
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo -n $"FAILED"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "]"
  echo -ne "\r"
  return 1
}

echo_passed() {
  [ "$BOOTUP" = "color" ] && $MOVE_TO_COL
  echo -n "["
  [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
  echo -n $"PASSED"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "]"
  echo -ne "\r"
  return 1
}

echo_warning() {
  [ "$BOOTUP" = "color" ] && $MOVE_TO_COL
  echo -n "["
  [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
  echo -n $"WARNING"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "]"
  echo -ne "\r"
  return 1
}

# Inform the graphical boot of our current state
update_boot_stage() {
  if [ -x /bin/plymouth ]; then
    /bin/plymouth --update="$1"
  fi
  return 0
}

# Log that something succeeded
success() {
  [ "$BOOTUP" != "verbose" -a -z "${LSB:-}" ] && echo_success
  return 0
}

# Log that something failed
failure() {
  local rc=$?
  [ "$BOOTUP" != "verbose" -a -z "${LSB:-}" ] && echo_failure
  [ -x /bin/plymouth ] && /bin/plymouth --details
  return $rc
}

# Log that something passed, but may have had errors. Useful for fsck
passed() {
  local rc=$?
  [ "$BOOTUP" != "verbose" -a -z "${LSB:-}" ] && echo_passed
  return $rc
}

# Log a warning
warning() {
  local rc=$?
  [ "$BOOTUP" != "verbose" -a -z "${LSB:-}" ] && echo_warning
  return $rc
}

# Run some action. Log its output.
action() {
  local STRING rc

  STRING=$1
  echo -n "$STRING "
  shift
  "$@" && success $"$STRING" || failure $"$STRING"
  rc=$?
  echo
  return $rc
}

# returns OK if $1 contains $2
strstr() {
  [ "${1#*$2*}" = "$1" ] && return 1
  return 0
}

# Check whether file $1 is a backup or rpm-generated file and should be ignored
is_ignored_file() {
  case "$1" in
  *~ | *.bak | *.old | *.orig | *.rpmnew | *.rpmorig | *.rpmsave)
    return 0
    ;;
  esac
  return 1
}

# Convert the value ${1} of time unit ${2}-seconds into seconds:
convert2sec() {
  local retval=""

  case "${2}" in
  deci)   retval=$(awk "BEGIN {printf \"%.1f\", ${1} / 10}") ;;
  centi)  retval=$(awk "BEGIN {printf \"%.2f\", ${1} / 100}") ;;
  mili)   retval=$(awk "BEGIN {printf \"%.3f\", ${1} / 1000}") ;;
  micro)  retval=$(awk "BEGIN {printf \"%.6f\", ${1} / 1000000}") ;;
  nano)   retval=$(awk "BEGIN {printf \"%.9f\", ${1} / 1000000000}") ;;
  piko)   retval=$(awk "BEGIN {printf \"%.12f\", ${1} / 1000000000000}") ;;
  esac

  echo "${retval}"
}

# Evaluate shvar-style booleans
is_true() {
  case "$1" in
  [tT] | [yY] | [yY][eE][sS] | [oO][nN] | [tT][rR][uU][eE] | 1)
    return 0
    ;;
  esac
  return 1
}

# Evaluate shvar-style booleans
is_false() {
  case "$1" in
  [fF] | [nN] | [nN][oO] | [oO][fF][fF] | [fF][aA][lL][sS][eE] | 0)
    return 0
    ;;
  esac
  return 1
}

# Apply sysctl settings, including files in /etc/sysctl.d
apply_sysctl() {
  if [ -x /lib/systemd/systemd-sysctl ]; then
  /lib/systemd/systemd-sysctl
  else
    for file in /usr/lib/sysctl.d/*.conf ; do
      is_ignored_file "$file" && continue
      [ -f /run/sysctl.d/${file##*/} ] && continue
      [ -f /etc/sysctl.d/${file##*/} ] && continue
      test -f "$file" && sysctl -e -p "$file" >/dev/null 2>&1
    done
    for file in /run/sysctl.d/*.conf ; do
      is_ignored_file "$file" && continue
      [ -f /etc/sysctl.d/${file##*/} ] && continue
      test -f "$file" && sysctl -e -p "$file" >/dev/null 2>&1
    done
    for file in /etc/sysctl.d/*.conf ; do
      is_ignored_file "$file" && continue
      test -f "$file" && sysctl -e -p "$file" >/dev/null 2>&1
    done
    sysctl -e -p /etc/sysctl.conf >/dev/null 2>&1
  fi
}

# A sed expression to filter out the files that is_ignored_file recognizes
__sed_discard_ignored_files='/\(~\|\.bak\|\.old\|\.orig\|\.rpmnew\|\.rpmorig\|\.rpmsave\)$/d'

if [ "$_use_systemctl" = "1" ]; then
    if  [ "x$1" = xstart -o \
        "x$1" = xstop -o \
        "x$1" = xrestart -o \
        "x$1" = xreload -o \
        "x$1" = xtry-restart -o \
        "x$1" = xforce-reload -o \
        "x$1" = xcondrestart ] ; then

    systemctl_redirect $0 $1
    exit $?
  fi
fi

strstr "$(cat /proc/cmdline)" "rc.debug" && set -x
return 0