Add fleet groups, agent screenshots, deploy guards, and Crucible polish.

agent/client/client.go

@@ -10,7 +10,6 @@ import (
 	"net/http"
 	"net/url"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -343,7 +342,9 @@ func (c *AgentClient) handleMessage(msg Message) {
 		if err := json.Unmarshal(msg.Payload, &cmd); err != nil {
 			return
 		}
-		c.handleCommand(cmd.Action, cmd.TailLines, cmd.Command, cmd.Path, cmd.Data)
+		// Run off the read loop so long exec/powershell probes do not block
+		// subsequent commands or server pings.
+		go c.handleCommand(cmd.Action, cmd.TailLines, cmd.Command, cmd.Path, cmd.Data)
 	}
 }
 
@@ -477,9 +478,7 @@ func (c *AgentClient) restartSelf() {
 	if err != nil {
 		return
 	}
-	cmd := exec.Command(exe, "--run")
-	cmd.Dir = filepath.Dir(exe)
-	_ = cmd.Start()
+	_ = spawnWorker(exe)
 	os.Exit(0)
 }
 
@@ -544,9 +543,7 @@ func (c *AgentClient) performUpgrade(downloadURL string) {
 	c.sendCommandResult("upgrade", true, "binary replaced — restarting")
 	time.Sleep(500 * time.Millisecond)
 
-	cmd := exec.Command(exe, "--run")
-	cmd.Dir = filepath.Dir(exe)
-	if startErr := cmd.Start(); startErr != nil {
+	if startErr := spawnWorker(exe); startErr != nil {
 		log.Printf("[agent] upgrade: restart failed: %v", startErr)
 	}
 	os.Exit(0)