From dcb6fdbe4efa0d3f8cfd574e4f901ac94f3b5505 Mon Sep 17 00:00:00 2001
From: Marko Klemetti <marko.klemetti@gmail.com>
Date: Tue, 2 May 2017 20:13:27 +0300
Subject: [PATCH] initial commit

---
 LICENSE   | 21 +++++++++++++++
 README.md | 42 +++++++++++++++++++++++++++++
 wait-for  | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 142 insertions(+)
 create mode 100644 LICENSE
 create mode 100644 README.md
 create mode 100755 wait-for

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..665dd20
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 Eficode Oy
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..7b860ef
--- /dev/null
+++ b/README.md
@@ -0,0 +1,42 @@
+## Wait for another service
+
+`./wait-for` is a script designed to synchronize services like docker containers. It is [sh](https://en.wikipedia.org/wiki/Bourne_shell) and [alpine](https://alpinelinux.org/) compatible.
+
+`./wait-for` has been inspired by [vishnubob/wait-for-it](https://github.com/vishnubob/wait-for-it), but the core has been rewritten at [Eficode](http://eficode.com/).
+
+## Usage
+
+```
+./wait-for host:port [-t timeout] [-- command args]
+  -q | --quiet                        Do not output any status messages
+  -t TIMEOUT | --timeout=timeout      Timeout in seconds, zero for no timeout
+  -- COMMAND ARGS                     Execute command with args after the test finishes
+```
+
+## Examples
+
+To check if [eficode.com](https://eficode.com) is available:
+
+```
+$ ./wait-for www.eficode.com:80 -- echo "Eficode site is up"
+
+Connection to www.eficode.com port 80 [tcp/http] succeeded!
+Eficode site is up
+```
+
+To wait for database container to become available:
+
+
+```
+version: '2'
+
+services:
+  db:
+    image: postgres:9.4
+
+  backend:
+    build: backend
+    command: sh -c './wait-for db:5432 -- npm start'
+    depends_on:
+      - db
+```
\ No newline at end of file
diff --git a/wait-for b/wait-for
new file mode 100755
index 0000000..315e307
--- /dev/null
+++ b/wait-for
@@ -0,0 +1,79 @@
+#!/bin/sh
+
+TIMEOUT=15
+QUIET=0
+
+echoerr() {
+  if [ "$QUIET" -ne 1 ]; then printf "%s\n" "$*" 1>&2; fi
+}
+
+usage() {
+  exitcode="$1"
+  cat << USAGE >&2
+Usage:
+  $cmdname host:port [-t timeout] [-- command args]
+  -q | --quiet                        Do not output any status messages
+  -t TIMEOUT | --timeout=timeout      Timeout in seconds, zero for no timeout
+  -- COMMAND ARGS                     Execute command with args after the test finishes
+USAGE
+  exit "$exitcode"
+}
+
+wait_for() {
+  command="$*"
+  for i in `seq $TIMEOUT` ; do
+    nc -z "$HOST" "$PORT"
+    result=$?
+    if [ $result -eq 0 ] ; then
+      if [ -n "$command" ] ; then
+        exec $command
+      fi
+      exit 0
+    fi
+    sleep 1
+  done
+  echo "Operation timed out" >&2
+  exit 1
+}
+
+while [ $# -gt 0 ]
+do
+  case "$1" in
+    *:* )
+    HOST=$(printf "%s\n" "$1"| cut -d : -f 1)
+    PORT=$(printf "%s\n" "$1"| cut -d : -f 2)
+    shift 1
+    ;;
+    -q | --quiet)
+    QUIET=1
+    shift 1
+    ;;
+    -t)
+    TIMEOUT="$2"
+    if [ "$TIMEOUT" = "" ]; then break; fi
+    shift 2
+    ;;
+    --timeout=*)
+    TIMEOUT="${1#*=}"
+    shift 1
+    ;;
+    --)
+    shift
+    break
+    ;;
+    --help)
+    usage 0
+    ;;
+    *)
+    echoerr "Unknown argument: $1"
+    usage 1
+    ;;
+  esac
+done
+
+if [ "$HOST" = "" -o "$PORT" = "" ]; then
+  echoerr "Error: you need to provide a host and port to test."
+  usage 2
+fi
+
+wait_for "$@"