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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include <iostream> | 5 #include <iostream> |
6 #include <sstream> | 6 #include <sstream> |
7 | 7 |
8 #include "base/files/file_util.h" | 8 #include "base/files/file_util.h" |
9 #include "base/strings/string_split.h" | 9 #include "base/strings/string_split.h" |
10 #include "base/strings/string_util.h" | 10 #include "base/strings/string_util.h" |
11 #include "base/strings/utf_string_conversions.h" | 11 #include "base/strings/utf_string_conversions.h" |
12 #include "build/build_config.h" | 12 #include "build/build_config.h" |
13 #include "tools/gn/err.h" | 13 #include "tools/gn/err.h" |
14 #include "tools/gn/filesystem_utils.h" | 14 #include "tools/gn/filesystem_utils.h" |
15 #include "tools/gn/functions.h" | 15 #include "tools/gn/functions.h" |
16 #include "tools/gn/input_file.h" | 16 #include "tools/gn/input_file.h" |
17 #include "tools/gn/parse_tree.h" | 17 #include "tools/gn/parse_tree.h" |
18 #include "tools/gn/scheduler.h" | 18 #include "tools/gn/scheduler.h" |
19 | 19 |
20 namespace functions { | 20 namespace functions { |
21 | 21 |
22 namespace { | |
23 | |
24 // On Windows, provide a custom implementation of base::WriteFile. Sometimes | |
25 // the base version fails, especially on the bots. The guess is that Windows | |
26 // Defender or other antivirus programs still have the file open (after | |
27 // checking for the read) when the write happens immediately after. This | |
28 // version opens with FILE_SHARE_READ (normally not what you want when | |
29 // replacing the entire contents of the file) which lets us continue even if | |
30 // another program has the file open for reading. See http://crbug.com/468437 | |
31 #if defined(OS_WIN) | |
32 int DoWriteFile(const base::FilePath& filename, const char* data, int size) { | |
33 base::win::ScopedHandle file(::CreateFile( | |
34 filename.value().c_str(), | |
35 GENERIC_WRITE, | |
36 FILE_SHARE_READ, | |
37 NULL, | |
38 CREATE_ALWAYS, | |
39 0, | |
40 NULL)); | |
41 if (!file.IsValid()) { | |
42 PLOG(ERROR) << "CreateFile failed for path " | |
43 << base::UTF16ToUTF8(filename.value()); | |
44 return -1; | |
45 } | |
46 | |
47 DWORD written; | |
48 BOOL result = ::WriteFile(file.Get(), data, size, &written, NULL); | |
49 if (result && static_cast<int>(written) == size) | |
50 return written; | |
51 | |
52 if (!result) { | |
53 // WriteFile failed. | |
54 PLOG(ERROR) << "writing file " << base::UTF16ToUTF8(filename.value()) | |
55 << " failed"; | |
56 } else { | |
57 // Didn't write all the bytes. | |
58 LOG(ERROR) << "wrote" << written << " bytes to " | |
59 << base::UTF16ToUTF8(filename.value()) << " expected " << size; | |
60 } | |
61 return -1; | |
62 } | |
63 #else | |
64 int DoWriteFile(const base::FilePath& filename, const char* data, int size) { | |
65 return base::WriteFile(filename, data, size); | |
66 } | |
67 #endif | |
68 | |
69 } // namespace | |
70 | |
71 const char kWriteFile[] = "write_file"; | 22 const char kWriteFile[] = "write_file"; |
72 const char kWriteFile_HelpShort[] = | 23 const char kWriteFile_HelpShort[] = |
73 "write_file: Write a file to disk."; | 24 "write_file: Write a file to disk."; |
74 const char kWriteFile_Help[] = | 25 const char kWriteFile_Help[] = |
75 "write_file: Write a file to disk.\n" | 26 "write_file: Write a file to disk.\n" |
76 "\n" | 27 "\n" |
77 " write_file(filename, data)\n" | 28 " write_file(filename, data)\n" |
78 "\n" | 29 "\n" |
79 " If data is a list, the list will be written one-item-per-line with no\n" | 30 " If data is a list, the list will be written one-item-per-line with no\n" |
80 " quoting or brackets.\n" | 31 " quoting or brackets.\n" |
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131 | 82 |
132 // Compute output. | 83 // Compute output. |
133 std::ostringstream contents; | 84 std::ostringstream contents; |
134 if (args[1].type() == Value::LIST) { | 85 if (args[1].type() == Value::LIST) { |
135 const std::vector<Value>& list = args[1].list_value(); | 86 const std::vector<Value>& list = args[1].list_value(); |
136 for (const auto& cur : list) | 87 for (const auto& cur : list) |
137 contents << cur.ToString(false) << std::endl; | 88 contents << cur.ToString(false) << std::endl; |
138 } else { | 89 } else { |
139 contents << args[1].ToString(false); | 90 contents << args[1].ToString(false); |
140 } | 91 } |
141 const std::string& new_contents = contents.str(); | 92 |
142 base::FilePath file_path = | 93 base::FilePath file_path = |
143 scope->settings()->build_settings()->GetFullPath(source_file); | 94 scope->settings()->build_settings()->GetFullPath(source_file); |
144 | 95 |
145 // Make sure we're not replacing the same contents. | 96 // Make sure we're not replacing the same contents. |
146 std::string existing_contents; | 97 if (!WriteFileIfChanged(file_path, contents.str(), err)) |
147 if (base::ReadFileToString(file_path, &existing_contents) && | 98 *err = Err(function->function(), err->message(), err->help_text()); |
148 existing_contents == new_contents) | |
149 return Value(); // Nothing to do. | |
150 | 99 |
151 // Write file, creating the directory if necessary. | |
152 if (!base::CreateDirectory(file_path.DirName())) { | |
153 *err = Err(function->function(), "Unable to create directory.", | |
154 "I was using \"" + FilePathToUTF8(file_path.DirName()) + "\"."); | |
155 return Value(); | |
156 } | |
157 | |
158 int int_size = static_cast<int>(new_contents.size()); | |
159 if (DoWriteFile(file_path, new_contents.c_str(), int_size) | |
160 != int_size) { | |
161 *err = Err(function->function(), "Unable to write file.", | |
162 "I was writing \"" + FilePathToUTF8(file_path) + "\"."); | |
163 return Value(); | |
164 } | |
165 return Value(); | 100 return Value(); |
166 } | 101 } |
167 | 102 |
168 } // namespace functions | 103 } // namespace functions |
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