package main import ( "archive/zip" "fmt" "io" "net/http" "os" "path/filepath" ) type ( // Terraform holds input parameters for terraform Terraform struct { Version string } ) func installTerraform(version string) error { err := downloadTerraform(version) if err != nil { return nil } return Unzip("/var/tmp/terraform.zip", "/bin") } func downloadTerraform(version string) error { return downloadFile("/var/tmp/terraform.zip", fmt.Sprintf("https://releases.hashicorp.com/terraform/%s/terraform_%s_linux_amd64.zip", version, version)) } func downloadFile(filepath string, url string) error { // Create the file out, err := os.Create(filepath) if err != nil { return err } defer out.Close() // Get the data resp, err := http.Get(url) if err != nil { return err } defer resp.Body.Close() // Writer the body to file _, err = io.Copy(out, resp.Body) if err != nil { return err } return nil } // Unzip a file to a destination func Unzip(src, dest string) error { r, err := zip.OpenReader(src) if err != nil { return err } defer func() { if err := r.Close(); err != nil { panic(err) } }() os.MkdirAll(dest, 0755) // Closure to address file descriptors issue with all the deferred .Close() methods extractAndWriteFile := func(f *zip.File) error { rc, err := f.Open() if err != nil { return err } defer func() { if err := rc.Close(); err != nil { panic(err) } }() path := filepath.Join(dest, f.Name) if f.FileInfo().IsDir() { os.MkdirAll(path, f.Mode()) } else { os.MkdirAll(filepath.Dir(path), f.Mode()) f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode()) if err != nil { return err } defer func() { if err := f.Close(); err != nil { panic(err) } }() _, err = io.Copy(f, rc) if err != nil { return err } } return nil } for _, f := range r.File { err := extractAndWriteFile(f) if err != nil { return err } } return nil }