Add a helper functions for checking unix root

drivers/exec/driver.go

@@ -22,7 +22,6 @@ import (
 	"github.com/hashicorp/nomad/plugins/shared/hclspec"
 	"github.com/hashicorp/nomad/plugins/shared/loader"
 	"golang.org/x/net/context"
-	"golang.org/x/sys/unix"
 )
 
 const (
@@ -207,7 +206,7 @@ func (d *Driver) buildFingerprint() *drivers.Fingerprint {
 		return fp
 	}
 
-	if unix.Geteuid() != 0 {
+	if !utils.IsUnixRoot() {
 		fp.Health = drivers.HealthStateUnhealthy
 		fp.HealthDescription = "exec driver must run as root"
 		return fp

plugins/drivers/utils/utils_unix.go

@@ -5,6 +5,8 @@ package utils
 import (
 	"os/exec"
 	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 // isolateCommand sets the setsid flag in exec.Cmd to true so that the process
@@ -16,3 +18,8 @@ func isolateCommand(cmd *exec.Cmd) {
 	}
 	cmd.SysProcAttr.Setsid = true
 }
+
+// IsUnixRoot returns true if system is unix and user running is effectively root
+func IsUnixRoot() bool {
+	return unix.Geteuid() == 0
+}

plugins/drivers/utils/utils_windows.go

@@ -6,3 +6,8 @@ import (
 
 // TODO Figure out if this is needed in Windows
 func isolateCommand(cmd *exec.Cmd) {}
+
+// IsUnixRoot returns true if system is a unix system and the effective uid of user is root
+func IsUnixRoot() bool {
+	return false
+}