Merge pull request #6282 from hashicorp/f-connect-dev-path

connect: check if consul is on PATH

command/agent/config.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"net"
 	"os"
+	"os/exec"
 	"os/user"
 	"path/filepath"
 	"runtime"
@@ -705,6 +706,10 @@ func newDevModeConfig(devMode, connectMode bool) (*devModeConfig, error) {
 			return nil, fmt.Errorf(
 				"-dev-connect uses network namespaces and is only supported for root.")
 		}
+		// Ensure Consul is on PATH
+		if _, err := exec.LookPath("consul"); err != nil {
+			return nil, fmt.Errorf("-dev-connect requires a 'consul' binary in Nomad's $PATH")
+		}
 		mode.connectMode = true
 	}
 	err := mode.networkConfig()