feat(cli): flue update — fetch, verify, swap, and restart the daemon

README.md

@@ -66,6 +66,7 @@ flue relay status  # show the configured relay
 flue relay update  # redeploy this release's relay; secret and pairings kept
 flue relay address # repoint this machine at a custom domain on the same relay
 flue serve         # run the daemon in the foreground, no login service
+flue update        # download the newest release, swap this binary, restart the daemon
 flue version       # print the version (also --version, -v)
 ```
 

cmd/flue/enable_test.go

@@ -16,9 +16,12 @@ import (
 type fakeManager struct {
 	st           service.Status
 	enableErr    error
+	restartErr   error
 	warns        []string // what Warnings reports after Enable
+	onRestart    func()   // runs inside Restart, before it reports back
 	enableCalls  int
 	disableCalls int
+	restartCalls int
 	statusCalls  int
 }
 
@@ -35,6 +38,17 @@ func (f *fakeManager) Disable() error {
 	f.st = service.Status{}
 	return nil
 }
+func (f *fakeManager) Restart() error {
+	f.restartCalls++
+	if f.restartErr != nil {
+		return f.restartErr
+	}
+	if f.onRestart != nil {
+		f.onRestart()
+	}
+	f.st = service.Status{Installed: true, Running: true}
+	return nil
+}
 func (f *fakeManager) Status() (service.Status, error) {
 	f.statusCalls++
 	return f.st, nil

cmd/flue/main.go

@@ -84,6 +84,8 @@ func main() {
 		err = cmdStatus()
 	case "relay":
 		err = cmdRelay(os.Args[2:])
+	case "update":
+		err = cmdUpdate()
 	case "version", "--version", "-v":
 		err = cmdVersion()
 	case "-h", "--help", "help":
@@ -110,6 +112,7 @@ const usageText = `flue — your terminal, as a browser tab
   flue relay address URL  repoint this machine at a custom domain on the same relay
   flue open [path]        spawn a session in path and open it in the browser
   flue serve [--port N] [--open]   run the daemon in the foreground
+  flue update             download the newest release, swap this binary, restart the daemon
   flue version            print the version (also --version, -v)
 `
 

cmd/flue/release.go

@@ -112,9 +112,14 @@ func (c *releaseChecker) refresh(ctx context.Context) {
 	if err != nil {
 		return
 	}
-	c.latest, c.url = tag, url
+	c.latest, c.url = strings.TrimPrefix(tag, "v"), url
 }
 
+// fetch asks GitHub for the latest stable release. The tag comes back raw —
+// leading v and all — because it is the release's address: flue update builds
+// download URLs under /releases/download/<tag>/ from it, exactly as
+// install.sh does. Callers that want a version to compare or render trim the
+// v themselves, as refresh does for the cache.
 func (c *releaseChecker) fetch(ctx context.Context) (tag, url string, err error) {
 	res, err := c.get(ctx, releaseAPI)
 	if err != nil {
@@ -136,7 +141,7 @@ func (c *releaseChecker) fetch(ctx context.Context) (tag, url string, err error)
 	if body.Draft || body.Pre {
 		return "", "", fmt.Errorf("latest release is not a stable one")
 	}
-	return strings.TrimPrefix(body.TagName, "v"), body.HTMLURL, nil
+	return body.TagName, body.HTMLURL, nil
 }
 
 // newer says whether `latest` is a later release than `current`.