package main import ( "bytes" "fmt" "io" "log" "net/http" "os" "time" cpio "github.com/cavaliercoder/go-cpio" yaml "gopkg.in/yaml.v2" ) func renderConfig(w http.ResponseWriter, r *http.Request, ctx *renderContext) error { log.Printf("sending config for %q", ctx.Host.Name) _, cfg, err := ctx.Config() if err != nil { return err } ba, err := yaml.Marshal(cfg) if err != nil { return err } w.Header().Set("Content-Type", "application/yaml") http.ServeContent(w, r, "config.yaml", time.Unix(0, 0), bytes.NewReader(ba)) return nil } func buildInitrd(out io.Writer, ctx *renderContext) error { _, cfg, err := ctx.Config() if err != nil { return err } // send initrd basis initrdPath, err := ctx.distFetch("initrd", ctx.Host.Initrd) if err != nil { return err } err = writeFile(out, initrdPath) if err != nil { return err } // and our extra archive archive := cpio.NewWriter(out) // - required dirs for _, dir := range []string{ "boot", "boot/current", "boot/current/layers", } { archive.WriteHeader(&cpio.Header{ Name: dir, Mode: 0600 | cpio.ModeDir, }) } // - the layers for _, layer := range cfg.Layers { layerVersion := ctx.Host.Versions[layer] if layerVersion == "" { return fmt.Errorf("layer %q not mapped to a version", layer) } path, err := ctx.distFetch("layers", layer, layerVersion) if err != nil { return err } stat, err := os.Stat(path) if err != nil { return err } archive.WriteHeader(&cpio.Header{ Name: "boot/current/layers/" + layer + ".fs", Mode: 0600, Size: stat.Size(), }) if err = writeFile(archive, path); err != nil { return err } } // - the configuration ba, err := yaml.Marshal(cfg) if err != nil { return err } archive.WriteHeader(&cpio.Header{ Name: "boot/config.yaml", Mode: 0600, Size: int64(len(ba)), }) archive.Write(ba) // finalize the archive archive.Flush() archive.Close() return nil }