package qemu import ( "context" "fmt" "net/http" commonhelper "github.com/hashicorp/packer/helper/common" "github.com/hashicorp/packer/helper/multistep" "github.com/hashicorp/packer/packer" ) // This step set iso_patch to available url type stepSetISO struct { ResultKey string Url []string } func (s *stepSetISO) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction { ui := state.Get("ui").(packer.Ui) iso_path := "" for _, url := range s.Url { req, err := http.NewRequest("HEAD", url, nil) if err != nil { continue } req.Header.Set("User-Agent", "Packer") httpClient := commonhelper.HttpClientWithEnvironmentProxy() res, err := httpClient.Do(req) if err == nil && (res.StatusCode >= 200 && res.StatusCode < 300) { if res.Header.Get("Accept-Ranges") == "bytes" { iso_path = url } } } if iso_path == "" { err := fmt.Errorf("No byte serving support. The HTTP server must support Accept-Ranges=bytes") state.Put("error", err) ui.Error(err.Error()) return multistep.ActionHalt } state.Put(s.ResultKey, iso_path) return multistep.ActionContinue } func (s *stepSetISO) Cleanup(state multistep.StateBag) {}