Add a utility function to run a process as an arbitrary user...

base/multiprocess_test.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MULTIPROCESS_TEST_H_
 #define BASE_MULTIPROCESS_TEST_H_
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/process_util.h"
@@ skipping 65 matching lines @@
 
 #if defined(OS_POSIX)
   base::ProcessHandle SpawnChild(
       const std::wstring& procname,
       const base::file_handle_mapping_vector& fds_to_map,
       bool debug_on_start) {
     return SpawnChildImpl(procname, fds_to_map, debug_on_start);
   }
 #endif
 
+protected:
+  CommandLine MakeCmdLine(const std::wstring& procname, bool debug_on_start) {
+    CommandLine cl(*CommandLine::ForCurrentProcess());
+    cl.AppendSwitchWithValue(kRunClientProcess, procname);
+    if (debug_on_start)
+      cl.AppendSwitch(switches::kDebugOnStart);
+    return cl;
+  }
+
  private:
 #if defined(OS_WIN)
-  base::ProcessHandle SpawnChildImpl(
-      const std::wstring& procname,
-      bool debug_on_start) {
-    CommandLine cl(*CommandLine::ForCurrentProcess());
+  base::ProcessHandle SpawnChildImpl(const std::wstring& procname,
+                                     bool debug_on_start) {
     base::ProcessHandle handle = static_cast<base::ProcessHandle>(NULL);
-    cl.AppendSwitchWithValue(kRunClientProcess, procname);
-
-    if (debug_on_start)
-      cl.AppendSwitch(switches::kDebugOnStart);
-
-    base::LaunchApp(cl, false, true, &handle);
+    base::LaunchApp(MakeCmdLine(procname, debug_on_start),
+                    false, true, &handle);
     return handle;
   }
+
 #elif defined(OS_POSIX)
   // TODO(port): with the CommandLine refactoring, this code is very similar
   // to the Windows code.  Investigate whether this can be made shorter.
   base::ProcessHandle SpawnChildImpl(
       const std::wstring& procname,
       const base::file_handle_mapping_vector& fds_to_map,
       bool debug_on_start) {
-    CommandLine cl(*CommandLine::ForCurrentProcess());
     base::ProcessHandle handle = base::kNullProcessHandle;
-    cl.AppendSwitchWithValue(kRunClientProcess, procname);
-
-    if (debug_on_start)
-      cl.AppendSwitch(switches::kDebugOnStart);
-
-    base::LaunchApp(cl.argv(), fds_to_map, false, &handle);
+    base::LaunchApp(MakeCmdLine(procname, debug_on_start).argv(),
+                    fds_to_map, false, &handle);
     return handle;
   }
 #endif
 };
 
 #endif  // BASE_MULTIPROCESS_TEST_H_