Initial

.envrc.sample

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+export GOPATH=`pwd`/.vendor:$GOPATH

.gitignore

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+# Ignore Bunch vendor directory
+.vendor
+
+# Ignore direnv .envrc
+.envrc
+
+# Ignore compiled versions
+bin

Bunchfile

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+bitbucket.org/masteryconnectetl/docker-cron !self
+github.com/codegangsta/cli
+github.com/robfig/cron

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 MasteryConnect
+
+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.

README.md

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+# docker-cron
+A simple one liner to run a command on a cron schedule.
+
+## Overview
+`docker-cron` was born out of wanting a simple one liner way to keep a docker container up with a command being run at specific intervals. Integrating cron into a container in a generic way always presented itself as a much longer and harder process than was really worth it to just run a simple script. So we built `docker-cron` to make getting a simple single purpose docker container up a running faster.
+
+## Code Example
+
+Print out "hello world" every 10 seconds
+```
+docker-cron --seconds=*/10 echo hello world
+```
+
+Run file every 15 minutes
+```
+docker-cron --seconds=0 --minutes=*/15 ./test.sh
+```
+
+To see the help text
+```
+docker-cron --help
+```

build.sh

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+#!/bin/bash
+
+build() {
+  echo "Building for Linux..."
+  GOOS=linux GOARCH=amd64 go build -o ./bin/linux/amd64/docker-cron .
+  GOOS=linux GOARCH=386 go build -o ./bin/linux/386/docker-cron .
+  GOOS=linux GOARCH=arm go build -o ./bin/linux/arm/docker-cron .
+
+  echo "Building for Mac..."
+  GOOS=darwin GOARCH=amd64 go build -o ./bin/darwin/amd64/docker-cron .
+  GOOS=darwin GOARCH=386 go build -o ./bin/darwin/386/docker-cron .
+
+  echo "Building for FreeBSD..."
+  GOOS=freebsd GOARCH=amd64 go build -o ./bin/freebsd/amd64/docker-cron .
+  GOOS=freebsd GOARCH=386 go build -o ./bin/freebsd/386/docker-cron .
+
+  echo "Building for Windows..."
+  GOOS=windows GOARCH=amd64 go build -o ./bin/windows/amd64/docker-cron .
+  GOOS=windows GOARCH=386 go build -o ./bin/windows/386/docker-cron .
+}
+
+build

main.go

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+package main
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"os/exec"
+	"os/signal"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/codegangsta/cli"
+	"github.com/robfig/cron"
+)
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "docker-cron"
+	app.Usage = "used to run shell commands at specified intervals / times, based on cron syntax"
+	app.Version = "1.0"
+	app.Authors = []cli.Author{
+		cli.Author{
+			Name: "Daniel Baldwin",
+		},
+	}
+	app.Copyright = `
+The MIT License (MIT)
+
+Copyright (c) 2015 MasteryConnect
+
+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.
+	`
+	app.Flags = []cli.Flag{
+		cli.StringFlag{
+			Name:  "seconds",
+			Value: "*",
+			Usage: "seconds: 0-59, */10",
+		},
+		cli.StringFlag{
+			Name:  "minutes",
+			Value: "*",
+			Usage: "minutes: 0-59, */10",
+		},
+		cli.StringFlag{
+			Name:  "hours",
+			Value: "*",
+			Usage: "hours: 0-23, */10",
+		},
+		cli.StringFlag{
+			Name:  "day-of-month",
+			Value: "*",
+			Usage: "day of month: 1-31",
+		},
+		cli.StringFlag{
+			Name:  "months",
+			Value: "*",
+			Usage: "month: 1-12 or JAN-DEC, */10",
+		},
+		cli.StringFlag{
+			Name:  "day-of-week",
+			Value: "*",
+			Usage: "day of week: 0-6 or SUN-SAT",
+		},
+	}
+	app.Action = func(con *cli.Context) {
+		// Vars
+		var command string
+
+		// Checks
+		if len(con.Args()) > 0 {
+			command = strings.Join(con.Args(), " ")
+		} else {
+			log.Fatal("Not enough args, need a command to run.")
+			cli.ShowAppHelp(con)
+		}
+
+		// Ensure handling of SIGTERM and Interrupt
+		signalChan := make(chan os.Signal, 1)
+		signal.Notify(signalChan, os.Interrupt)
+		signal.Notify(signalChan, syscall.SIGTERM)
+		go func() {
+			<-signalChan
+			os.Exit(1)
+		}()
+
+		// Setup cron job
+		c := cron.New()
+		schedule := strings.Join([]string{
+			con.String("seconds"),
+			con.String("minutes"),
+			con.String("hours"),
+			con.String("day-of-month"),
+			con.String("months"),
+			con.String("day-of-week"),
+		}, " ")
+		log.Printf("Setup cron to run on schedule: %s\n", schedule)
+		c.AddFunc(schedule, func() {
+			log.Printf("Running cron on schedule: %s\n", schedule)
+
+			cmd := exec.Command("sh", "-c", command)
+
+			cmdReader, err := cmd.StdoutPipe()
+			if err != nil {
+				log.Fatal("Error creating stdoutpipe for command", err)
+			}
+
+			scanner := bufio.NewScanner(cmdReader)
+			go func() {
+				for scanner.Scan() {
+					log.Println(scanner.Text())
+				}
+			}()
+
+			err = cmd.Start()
+			if err != nil {
+				log.Fatal("Error running command", err)
+			}
+
+			err = cmd.Wait()
+			if err != nil {
+				log.Fatal("Error waiting for command", err)
+			}
+		})
+		c.Start()
+
+		// Hold and let the cron job run
+		for {
+			time.Sleep(30 * time.Second)
+		}
+	}
+
+	app.Run(os.Args)
+}