github.com/gudimz/urlShortener@v0.0.0-20230129195305-c8ee33059a67/wait-for-it.sh (about)

     1  #!/usr/bin/env bash
     2  # Use this script to test if a given TCP host/port are available
     3  # Stolen from https://github.com/vishnubob/wait-for-it
     4  
     5  WAITFORIT_cmdname=${0##*/}
     6  
     7  echoerr() { if [[ $WAITFORIT_QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }
     8  
     9  usage()
    10  {
    11      cat << USAGE >&2
    12  Usage:
    13      $WAITFORIT_cmdname host:port [-s] [-t timeout] [-- command args]
    14      -h HOST | --host=HOST       Host or IP under test
    15      -p PORT | --port=PORT       TCP port under test
    16                                  Alternatively, you specify the host and port as host:port
    17      -s | --strict               Only execute subcommand if the test succeeds
    18      -q | --quiet                Don't output any status messages
    19      -t TIMEOUT | --timeout=TIMEOUT
    20                                  Timeout in seconds, zero for no timeout
    21      -- COMMAND ARGS             Execute command with args after the test finishes
    22  USAGE
    23      exit 1
    24  }
    25  
    26  wait_for()
    27  {
    28      if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then
    29          echoerr "$WAITFORIT_cmdname: waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT"
    30      else
    31          echoerr "$WAITFORIT_cmdname: waiting for $WAITFORIT_HOST:$WAITFORIT_PORT without a timeout"
    32      fi
    33      WAITFORIT_start_ts=$(date +%s)
    34      while :
    35      do
    36          if [[ $WAITFORIT_ISBUSY -eq 1 ]]; then
    37              nc -z $WAITFORIT_HOST $WAITFORIT_PORT
    38              WAITFORIT_result=$?
    39          else
    40              (echo -n > /dev/tcp/$WAITFORIT_HOST/$WAITFORIT_PORT) >/dev/null 2>&1
    41              WAITFORIT_result=$?
    42          fi
    43          if [[ $WAITFORIT_result -eq 0 ]]; then
    44              WAITFORIT_end_ts=$(date +%s)
    45              echoerr "$WAITFORIT_cmdname: $WAITFORIT_HOST:$WAITFORIT_PORT is available after $((WAITFORIT_end_ts - WAITFORIT_start_ts)) seconds"
    46              break
    47          fi
    48          sleep 1
    49      done
    50      return $WAITFORIT_result
    51  }
    52  
    53  wait_for_wrapper()
    54  {
    55      # In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692
    56      if [[ $WAITFORIT_QUIET -eq 1 ]]; then
    57          timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --quiet --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT &
    58      else
    59          timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT &
    60      fi
    61      WAITFORIT_PID=$!
    62      trap "kill -INT -$WAITFORIT_PID" INT
    63      wait $WAITFORIT_PID
    64      WAITFORIT_RESULT=$?
    65      if [[ $WAITFORIT_RESULT -ne 0 ]]; then
    66          echoerr "$WAITFORIT_cmdname: timeout occurred after waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT"
    67      fi
    68      return $WAITFORIT_RESULT
    69  }
    70  
    71  # process arguments
    72  while [[ $# -gt 0 ]]
    73  do
    74      case "$1" in
    75          *:* )
    76          WAITFORIT_hostport=(${1//:/ })
    77          WAITFORIT_HOST=${WAITFORIT_hostport[0]}
    78          WAITFORIT_PORT=${WAITFORIT_hostport[1]}
    79          shift 1
    80          ;;
    81          --child)
    82          WAITFORIT_CHILD=1
    83          shift 1
    84          ;;
    85          -q | --quiet)
    86          WAITFORIT_QUIET=1
    87          shift 1
    88          ;;
    89          -s | --strict)
    90          WAITFORIT_STRICT=1
    91          shift 1
    92          ;;
    93          -h)
    94          WAITFORIT_HOST="$2"
    95          if [[ $WAITFORIT_HOST == "" ]]; then break; fi
    96          shift 2
    97          ;;
    98          --host=*)
    99          WAITFORIT_HOST="${1#*=}"
   100          shift 1
   101          ;;
   102          -p)
   103          WAITFORIT_PORT="$2"
   104          if [[ $WAITFORIT_PORT == "" ]]; then break; fi
   105          shift 2
   106          ;;
   107          --port=*)
   108          WAITFORIT_PORT="${1#*=}"
   109          shift 1
   110          ;;
   111          -t)
   112          WAITFORIT_TIMEOUT="$2"
   113          if [[ $WAITFORIT_TIMEOUT == "" ]]; then break; fi
   114          shift 2
   115          ;;
   116          --timeout=*)
   117          WAITFORIT_TIMEOUT="${1#*=}"
   118          shift 1
   119          ;;
   120          --)
   121          shift
   122          WAITFORIT_CLI=("$@")
   123          break
   124          ;;
   125          --help)
   126          usage
   127          ;;
   128          *)
   129          echoerr "Unknown argument: $1"
   130          usage
   131          ;;
   132      esac
   133  done
   134  
   135  if [[ "$WAITFORIT_HOST" == "" || "$WAITFORIT_PORT" == "" ]]; then
   136      echoerr "Error: you need to provide a host and port to test."
   137      usage
   138  fi
   139  
   140  WAITFORIT_TIMEOUT=${WAITFORIT_TIMEOUT:-15}
   141  WAITFORIT_STRICT=${WAITFORIT_STRICT:-0}
   142  WAITFORIT_CHILD=${WAITFORIT_CHILD:-0}
   143  WAITFORIT_QUIET=${WAITFORIT_QUIET:-0}
   144  
   145  # Check to see if timeout is from busybox?
   146  WAITFORIT_TIMEOUT_PATH=$(type -p timeout)
   147  WAITFORIT_TIMEOUT_PATH=$(realpath $WAITFORIT_TIMEOUT_PATH 2>/dev/null || readlink -f $WAITFORIT_TIMEOUT_PATH)
   148  
   149  WAITFORIT_BUSYTIMEFLAG=""
   150  if [[ $WAITFORIT_TIMEOUT_PATH =~ "busybox" ]]; then
   151      WAITFORIT_ISBUSY=1
   152      # Check if busybox timeout uses -t flag
   153      # (recent Alpine versions don't support -t anymore)
   154      if timeout &>/dev/stdout | grep -q -e '-t '; then
   155          WAITFORIT_BUSYTIMEFLAG="-t"
   156      fi
   157  else
   158      WAITFORIT_ISBUSY=0
   159  fi
   160  
   161  if [[ $WAITFORIT_CHILD -gt 0 ]]; then
   162      wait_for
   163      WAITFORIT_RESULT=$?
   164      exit $WAITFORIT_RESULT
   165  else
   166      if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then
   167          wait_for_wrapper
   168          WAITFORIT_RESULT=$?
   169      else
   170          wait_for
   171          WAITFORIT_RESULT=$?
   172      fi
   173  fi
   174  
   175  if [[ $WAITFORIT_CLI != "" ]]; then
   176      if [[ $WAITFORIT_RESULT -ne 0 && $WAITFORIT_STRICT -eq 1 ]]; then
   177          echoerr "$WAITFORIT_cmdname: strict mode, refusing to execute subprocess"
   178          exit $WAITFORIT_RESULT
   179      fi
   180      exec "${WAITFORIT_CLI[@]}"
   181  else
   182      exit $WAITFORIT_RESULT
   183  fi