143 lines
2.6 KiB
Go
143 lines
2.6 KiB
Go
package main
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import (
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"archive/tar"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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yaml "gopkg.in/yaml.v2"
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"novit.tech/direktil/pkg/cpiocat"
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)
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func renderBootstrapConfig(w http.ResponseWriter, r *http.Request, ctx *renderContext, asJson bool) (err error) {
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log.Printf("sending bootstrap config for %q", ctx.Host.Name)
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_, cfg, err := ctx.BootstrapConfig()
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if err != nil {
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return err
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}
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if asJson {
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err = json.NewEncoder(w).Encode(cfg)
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} else {
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err = yaml.NewEncoder(w).Encode(cfg)
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}
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return nil
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}
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func buildInitrd(out io.Writer, ctx *renderContext) (err error) {
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_, cfg, err := ctx.Config()
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if err != nil {
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return
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}
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cat := cpiocat.New(out)
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// initrd
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initrdPath, err := ctx.distFetch("initrd", ctx.Host.Initrd)
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if err != nil {
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return
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}
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cat.AppendArchFile(initrdPath)
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// embedded layers (modules)
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for _, layer := range cfg.Layers {
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switch layer {
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case "modules":
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layerVersion := ctx.Host.Versions[layer]
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modulesPath, err := ctx.distFetch("layers", layer, layerVersion)
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if err != nil {
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return err
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}
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cat.AppendFile(modulesPath, "modules.sqfs")
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}
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}
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// config
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cfgBytes, _, err := ctx.BootstrapConfig()
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if err != nil {
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return
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}
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cat.AppendBytes(cfgBytes, "config.yaml", 0600)
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// ssh keys
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// FIXME we want a bootstrap-stage key instead of the real host key
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for _, format := range []string{"rsa", "dsa", "ecdsa", "ed25519"} {
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cat.AppendBytes(cfg.FileContent("/etc/ssh/ssh_host_"+format+"_key"), "id_"+format, 0600)
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}
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return cat.Close()
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}
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func buildBootstrap(out io.Writer, ctx *renderContext) (err error) {
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arch := tar.NewWriter(out)
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defer arch.Close()
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// config
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cfgBytes, cfg, err := ctx.Config()
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if err != nil {
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return err
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}
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err = arch.WriteHeader(&tar.Header{Name: "config.yaml", Size: int64(len(cfgBytes))})
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if err != nil {
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return
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}
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_, err = arch.Write(cfgBytes)
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if err != nil {
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return
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}
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// layers
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for _, layer := range cfg.Layers {
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if layer == "modules" {
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continue // modules are with the kernel in boot v2
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}
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layerVersion := ctx.Host.Versions[layer]
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if layerVersion == "" {
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return fmt.Errorf("layer %q not mapped to a version", layer)
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}
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outPath, err := ctx.distFetch("layers", layer, layerVersion)
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if err != nil {
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return err
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}
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f, err := os.Open(outPath)
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if err != nil {
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return err
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}
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defer f.Close()
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stat, err := f.Stat()
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if err != nil {
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return err
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}
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if err = arch.WriteHeader(&tar.Header{
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Name: layer + ".fs",
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Size: stat.Size(),
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}); err != nil {
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return err
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}
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_, err = io.Copy(arch, f)
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if err != nil {
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return err
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}
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}
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return nil
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}
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