TUN-528: Move cloudflared into a separate repo

vendor/github.com/mholt/caddy/onevent/hook/hook.go

@@ -0,0 +1,41 @@
+package hook
+
+import (
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/mholt/caddy"
+)
+
+// Hook executes a command.
+func (cfg *Config) Hook(event caddy.EventName, info interface{}) error {
+	if event != cfg.Event {
+		return nil
+	}
+
+	nonblock := false
+	if len(cfg.Args) >= 1 && cfg.Args[len(cfg.Args)-1] == "&" {
+		// Run command in background; non-blocking
+		nonblock = true
+		cfg.Args = cfg.Args[:len(cfg.Args)-1]
+	}
+
+	// Execute command.
+	cmd := exec.Command(cfg.Command, cfg.Args...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if nonblock {
+		log.Printf("[INFO] Nonblocking Command \"%s %s\" with ID %s", cfg.Command, strings.Join(cfg.Args, " "), cfg.ID)
+		return cmd.Start()
+	}
+	log.Printf("[INFO] Blocking Command \"%s %s\" with ID %s", cfg.Command, strings.Join(cfg.Args, " "), cfg.ID)
+	err := cmd.Run()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}