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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/test/python_utils.h"
      6 
      7 #include "base/base_paths.h"
      8 #include "base/command_line.h"
      9 #include "base/environment.h"
     10 #include "base/file_util.h"
     11 #include "base/files/file_path.h"
     12 #include "base/logging.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "base/path_service.h"
     15 #include "base/strings/utf_string_conversions.h"
     16 
     17 const char kPythonPathEnv[] = "PYTHONPATH";
     18 
     19 void AppendToPythonPath(const base::FilePath& dir) {
     20   scoped_ptr<base::Environment> env(base::Environment::Create());
     21   std::string old_path;
     22   std::string dir_path;
     23 #if defined(OS_WIN)
     24   dir_path = WideToUTF8(dir.value());
     25 #elif defined(OS_POSIX)
     26   dir_path = dir.value();
     27 #endif
     28   if (!env->GetVar(kPythonPathEnv, &old_path)) {
     29     env->SetVar(kPythonPathEnv, dir_path.c_str());
     30   } else if (old_path.find(dir_path) == std::string::npos) {
     31     std::string new_path(old_path);
     32 #if defined(OS_WIN)
     33     new_path.append(";");
     34 #elif defined(OS_POSIX)
     35     new_path.append(":");
     36 #endif
     37     new_path.append(dir_path.c_str());
     38     env->SetVar(kPythonPathEnv, new_path);
     39   }
     40 }
     41 
     42 namespace {
     43 
     44 // Search for |to_try|, rolling up the directory tree from
     45 // |start_dir|.  If found, return true and put the path to |to_try| in
     46 // |out_dir|.  If not, return false and leave |out_dir| untouched.
     47 bool TryRelativeToDir(const base::FilePath& start_dir,
     48                       const base::FilePath& to_try,
     49                       base::FilePath* out_dir) {
     50   base::FilePath dir(start_dir);
     51   while (!base::DirectoryExists(dir.Append(to_try))) {
     52     base::FilePath parent = dir.DirName();
     53     if (parent == dir) {
     54       // We hit the root directory.
     55       return false;
     56     }
     57     dir = parent;
     58   }
     59   *out_dir = dir;
     60   return true;
     61 }
     62 
     63 }  // namespace
     64 
     65 bool GetPyProtoPath(base::FilePath* dir) {
     66   // Locate the Python code generated by the protocol buffers compiler.
     67   base::FilePath generated_code_dir;
     68   if (!PathService::Get(base::DIR_EXE, &generated_code_dir)) {
     69     LOG(ERROR) << "Can't find " << generated_code_dir.value();
     70     return false;
     71   }
     72 
     73   const base::FilePath kPyProto(FILE_PATH_LITERAL("pyproto"));
     74 
     75 #if defined(OS_MACOSX) || defined(OS_CHROMEOS)
     76   base::FilePath source_dir;
     77   if (!PathService::Get(base::DIR_SOURCE_ROOT, &source_dir)) {
     78     LOG(ERROR) << "Can't find " << source_dir.value();
     79     return false;
     80   }
     81   // On Mac, and possibly Chrome OS, DIR_EXE might be pointing deep
     82   // into the Release/ (or Debug/) directory and we can't depend on
     83   // how far down it goes. So we walk upwards from DIR_EXE until we
     84   // find a likely looking spot.
     85   if (!TryRelativeToDir(generated_code_dir, kPyProto, dir)) {
     86     LOG(WARNING) << "Can't find " << kPyProto.value()
     87                  << " next to " << generated_code_dir.value();
     88     // On Chrome OS, we may have installed the test binaries and support tools
     89     // in a wholly separate location, relative to DIR_SOURCE_ROOT.  We'll want
     90     // to do a similar investigation from that point as well.
     91     generated_code_dir = source_dir
     92         .Append(FILE_PATH_LITERAL("out"))
     93         .Append(FILE_PATH_LITERAL("Release"));
     94     if (!TryRelativeToDir(generated_code_dir, kPyProto, dir)) {
     95       LOG(WARNING) << "Can't find " << kPyProto.value()
     96                    << " next to " << generated_code_dir.value();
     97       return false;
     98     }
     99   }
    100   generated_code_dir = *dir;
    101 #endif
    102   *dir = generated_code_dir.Append(kPyProto);
    103   VLOG(2) << "Found " << kPyProto.value() << " in " << dir->value();
    104   return true;
    105 }
    106 
    107 bool GetPythonCommand(CommandLine* python_cmd) {
    108   DCHECK(python_cmd);
    109   base::FilePath dir;
    110 #if defined(OS_WIN)
    111   if (!PathService::Get(base::DIR_SOURCE_ROOT, &dir))
    112     return false;
    113   dir = dir.Append(FILE_PATH_LITERAL("third_party"))
    114            .Append(FILE_PATH_LITERAL("python_26"))
    115            .Append(FILE_PATH_LITERAL("python.exe"));
    116 #elif defined(OS_POSIX)
    117   dir = base::FilePath("python");
    118 #endif
    119 
    120   python_cmd->SetProgram(dir);
    121 
    122   // Launch python in unbuffered mode, so that python output doesn't mix with
    123   // gtest output in buildbot log files. See http://crbug.com/147368.
    124   python_cmd->AppendArg("-u");
    125 
    126   return true;
    127 }
    128