run_travis.go

package main

// This program takes two parameters, first is .travis.yml file and second section from travis file.
// It runs all commands from given section

import (
	"fmt"
	"log"
	"os"
	"os/exec"
	"strings"

	"io/ioutil"

	"gopkg.in/yaml.v2"
)

// TravisFile represents parsed travis file
// It includes only things that we are interested in
type TravisFile struct {
	BeforeInstall []string `yaml:"before_install"`
	Install       []string `yaml:"install"`
	Script        []string `yaml:"script"`
}

// execCmds executes commands from list
// stops executing when one of the commands errors out
func execCmds(list []string) error {
	for _, line := range list {
		fmt.Printf("running: %s\n", line)
		command := strings.Split(line, " ")
		cmd := exec.Command(command[0], command[1:]...)
		out, err := cmd.Output()
		if err != nil {
			return err
		}
		fmt.Println(string(out))
	}
	return nil
}

func main() {
	l := log.New(os.Stderr, "", 0)

	if len(os.Args) != 3 {
		l.Fatalf("Usage %s <travis file> <before_install|script>", os.Args[0])
	}

	filename := os.Args[1]
	section := os.Args[2]

	data, err := ioutil.ReadFile(filename)
	if err != nil {
		l.Fatal(err)
	}

	travisFile := TravisFile{}
	err = yaml.Unmarshal(data, &travisFile)
	if err != nil {
		l.Fatal(err)
	}

	switch section {
	case "before_install":
		err := execCmds(travisFile.BeforeInstall)
		if err != nil {
			l.Fatalf("command failed: %s", err)
		}
	case "install":
		err := execCmds(travisFile.Install)
		if err != nil {
			l.Fatalf("command failed: %s", err)
		}
	case "script":
		err := execCmds(travisFile.Script)
		if err != nil {
			l.Fatalf("command failed: %s", err)
		}
	default:
		l.Fatal("Unknown section")
	}

}