seedling: Webui installer (#587)

* 🌱 Add webui

Signed-off-by: mudler <mudler@c3os.io>

* 🌱 Re-read config files after loading bundles

Signed-off-by: mudler <mudler@c3os.io>

* [check-spelling] Update metadata

Update for https://github.com/kairos-io/kairos/actions/runs/3806058276/attempts/1
Accepted in https://github.com/kairos-io/kairos/pull/587#issuecomment-1367859480

Signed-off-by: check-spelling-bot <check-spelling-bot@users.noreply.github.com>
Signed-off-by: mudler <mudler@c3os.io>

* 🎨 Beautify index page

Signed-off-by: mudler <mudler@c3os.io>

* Do not rerun if we were successful or we are already running

Signed-off-by: mudler <mudler@c3os.io>

* Add syntax highlight

Signed-off-by: mudler <mudler@c3os.io>

* Add error message

Signed-off-by: mudler <mudler@c3os.io>

* Add YAML validation and highlight

Signed-off-by: mudler <mudler@c3os.io>

* Fixup terminal output

Signed-off-by: mudler <mudler@c3os.io>

* Fix newlines

Signed-off-by: mudler <mudler@c3os.io>

* fixups

Signed-off-by: mudler <mudler@c3os.io>

* 🎨 Fixup lint issues

Signed-off-by: mudler <mudler@c3os.io>

* Mark dependencies

Signed-off-by: mudler <mudler@c3os.io>

* Let configure the listening address

Signed-off-by: mudler <mudler@c3os.io>

Signed-off-by: mudler <mudler@c3os.io>
Signed-off-by: check-spelling-bot <check-spelling-bot@users.noreply.github.com>

internal/agent/agent.go

@@ -75,6 +75,12 @@ func Run(opts ...Option) error {
 		if c.FailOnBundleErrors && err != nil {
 			return err
 		}
+
+		// Re-read config files
+		c, err = config.Scan(config.Directories(o.Dir...))
+		if err != nil {
+			return err
+		}
 	}
 
 	_, err = bus.Manager.Publish(events.EventBootstrap, events.BootstrapPayload{APIAddress: o.APIAddress, Config: c.String(), Logfile: fileName})

internal/agent/config.go

@@ -14,10 +14,13 @@ type BrandingText struct {
 	Reset              string `yaml:"reset"`
 	Recovery           string `yaml:"recovery"`
 }
-
+type WebUI struct {
+	Disable       bool   `yaml:"disable"`
+	ListenAddress string `yaml:"listen_address"`
+}
 type Config struct {
 	Fast     bool         `yaml:"fast,omitempty"`
-
+	WebUI    WebUI        `yaml:"webui"`
 	Branding BrandingText `yaml:"branding"`
 }
 

internal/agent/install.go

@@ -228,6 +228,10 @@ func RunInstall(options map[string]string) error {
 		c.Install.Reboot = true
 	}
 
+	if c.Install.Image != "" {
+		options["system.uri"] = c.Install.Image
+	}
+
 	env := append(c.Install.Env, c.Env...)
 	utils.SetEnv(env)
 

internal/webui/webui.go

@@ -0,0 +1,241 @@
+package webui
+
+import (
+	"context"
+	"embed"
+	"io"
+	"io/fs"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"sync"
+	"text/template"
+	"time"
+
+	"github.com/kairos-io/kairos/internal/agent"
+	"github.com/labstack/echo/v4"
+	process "github.com/mudler/go-processmanager"
+	"github.com/nxadm/tail"
+	"golang.org/x/net/websocket"
+)
+
+type FormData struct {
+	CloudConfig string `form:"cloud-config" json:"cloud-config" query:"cloud-config"`
+	Reboot      string `form:"reboot" json:"reboot" query:"reboot"`
+
+	PowerOff           string `form:"power-off" json:"power-off" query:"power-off"`
+	InstallationDevice string `form:"installation-device" json:"installation-device" query:"installation-device"`
+}
+
+//go:embed public
+var embededFiles embed.FS
+
+func getFileSystem() http.FileSystem {
+	fsys, err := fs.Sub(embededFiles, "public")
+	if err != nil {
+		panic(err)
+	}
+
+	return http.FS(fsys)
+}
+
+func getFS() fs.FS {
+	fsys, err := fs.Sub(embededFiles, "public")
+	if err != nil {
+		panic(err)
+	}
+
+	return fsys
+}
+
+func streamProcess(s *state) func(c echo.Context) error {
+	return func(c echo.Context) error {
+		consumeError := func(err error) {
+			if err != nil {
+				c.Logger().Error(err)
+			}
+		}
+		websocket.Handler(func(ws *websocket.Conn) {
+			defer ws.Close()
+			for {
+				s.Lock()
+				if s.p == nil {
+					// Write
+					err := websocket.Message.Send(ws, "No process!")
+					consumeError(err)
+					s.Unlock()
+					return
+				}
+				s.Unlock()
+
+				if !s.p.IsAlive() {
+					errOut, err := os.ReadFile(s.p.StderrPath())
+					if err == nil {
+						err := websocket.Message.Send(ws, string(errOut))
+						consumeError(err)
+					}
+					out, err := os.ReadFile(s.p.StdoutPath())
+					if err == nil {
+						err = websocket.Message.Send(ws, string(out))
+						consumeError(err)
+					}
+					err = websocket.Message.Send(ws, "Process stopped!")
+					consumeError(err)
+					return
+				}
+
+				t, err := tail.TailFile(s.p.StdoutPath(), tail.Config{Follow: true})
+				if err != nil {
+					return
+				}
+				t2, err := tail.TailFile(s.p.StderrPath(), tail.Config{Follow: true})
+				if err != nil {
+					return
+				}
+
+				for {
+					select {
+					case line := <-t.Lines:
+						err = websocket.Message.Send(ws, line.Text+"\r\n")
+						consumeError(err)
+					case line := <-t2.Lines:
+						err = websocket.Message.Send(ws, line.Text+"\r\n")
+						consumeError(err)
+					}
+				}
+			}
+		}).ServeHTTP(c.Response(), c.Request())
+		return nil
+	}
+}
+
+type state struct {
+	p *process.Process
+	sync.Mutex
+}
+
+// TemplateRenderer is a custom html/template renderer for Echo framework.
+type TemplateRenderer struct {
+	templates *template.Template
+}
+
+// Render renders a template document.
+func (t *TemplateRenderer) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
+
+	// Add global methods if data is a map
+	if viewContext, isMap := data.(map[string]interface{}); isMap {
+		viewContext["reverse"] = c.Echo().Reverse
+	}
+
+	return t.templates.ExecuteTemplate(w, name, data)
+}
+
+func Start(ctx context.Context) error {
+
+	s := state{}
+	listen := ":8080"
+
+	ec := echo.New()
+	assetHandler := http.FileServer(getFileSystem())
+
+	renderer := &TemplateRenderer{
+		templates: template.Must(template.ParseFS(getFS(), "*.html")),
+	}
+
+	ec.Renderer = renderer
+	agentConfig, err := agent.LoadConfig()
+	if err != nil {
+		return err
+	}
+
+	if agentConfig.WebUI.ListenAddress != "" {
+		listen = agentConfig.WebUI.ListenAddress
+	}
+
+	if agentConfig.WebUI.Disable {
+		log.Println("WebUI installer disabled by branding")
+		return nil
+	}
+
+	ec.GET("/*", echo.WrapHandler(http.StripPrefix("/", assetHandler)))
+
+	ec.POST("/install", func(c echo.Context) error {
+
+		s.Lock()
+		if s.p != nil {
+			status, _ := s.p.ExitCode()
+			if s.p.IsAlive() || status == "0" {
+				s.Unlock()
+				return c.Redirect(http.StatusSeeOther, "progress.html")
+			}
+		}
+		s.Unlock()
+
+		formData := new(FormData)
+		if err := c.Bind(formData); err != nil {
+			return err
+		}
+
+		// Process the form data as necessary
+		cloudConfig := formData.CloudConfig
+		reboot := formData.Reboot
+		powerOff := formData.PowerOff
+		installationDevice := formData.InstallationDevice
+
+		args := []string{"manual-install"}
+
+		if powerOff == "on" {
+			args = append(args, "--poweroff")
+		}
+		if reboot == "on" {
+			args = append(args, "--reboot")
+		}
+		args = append(args, "--device", installationDevice)
+
+		// create tempfile to store cloud-config, bail out if we fail as we couldn't go much further
+		file, err := ioutil.TempFile("", "install-webui")
+		if err != nil {
+			log.Fatalf("could not create tmpfile for cloud-config: %s", err.Error())
+		}
+
+		err = os.WriteFile(file.Name(), []byte(cloudConfig), 0600)
+		if err != nil {
+			log.Fatalf("could not write tmpfile for cloud-config: %s", err.Error())
+		}
+
+		args = append(args, file.Name())
+
+		s.Lock()
+		s.p = process.New(process.WithName("/usr/bin/kairos-agent"), process.WithArgs(args...), process.WithTemporaryStateDir())
+		s.Unlock()
+		err = s.p.Run()
+		if err != nil {
+			return c.Render(http.StatusOK, "message.html", map[string]interface{}{
+				"message": err.Error(),
+				"type":    "danger",
+			})
+		}
+
+		// Start install process, lock with sentinel
+		return c.Redirect(http.StatusSeeOther, "progress.html")
+	})
+
+	ec.GET("/ws", streamProcess(&s))
+
+	if err := ec.Start(listen); err != nil && err != http.ErrServerClosed {
+		return err
+	}
+
+	go func() {
+		<-ctx.Done()
+		ct, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		err := ec.Shutdown(ct)
+		if err != nil {
+			log.Printf("shutdown failed: %s", err.Error())
+		}
+		cancel()
+	}()
+
+	return nil
+}