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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 |
22 const char kWriteFile[] = "write_file"; | 71 const char kWriteFile[] = "write_file"; |
23 const char kWriteFile_HelpShort[] = | 72 const char kWriteFile_HelpShort[] = |
24 "write_file: Write a file to disk."; | 73 "write_file: Write a file to disk."; |
25 const char kWriteFile_Help[] = | 74 const char kWriteFile_Help[] = |
26 "write_file: Write a file to disk.\n" | 75 "write_file: Write a file to disk.\n" |
27 "\n" | 76 "\n" |
28 " write_file(filename, data)\n" | 77 " write_file(filename, data)\n" |
29 "\n" | 78 "\n" |
30 " If data is a list, the list will be written one-item-per-line with no\n" | 79 " If data is a list, the list will be written one-item-per-line with no\n" |
31 " quoting or brackets.\n" | 80 " quoting or brackets.\n" |
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82 | 131 |
83 // Compute output. | 132 // Compute output. |
84 std::ostringstream contents; | 133 std::ostringstream contents; |
85 if (args[1].type() == Value::LIST) { | 134 if (args[1].type() == Value::LIST) { |
86 const std::vector<Value>& list = args[1].list_value(); | 135 const std::vector<Value>& list = args[1].list_value(); |
87 for (const auto& cur : list) | 136 for (const auto& cur : list) |
88 contents << cur.ToString(false) << std::endl; | 137 contents << cur.ToString(false) << std::endl; |
89 } else { | 138 } else { |
90 contents << args[1].ToString(false); | 139 contents << args[1].ToString(false); |
91 } | 140 } |
92 | 141 const std::string& new_contents = contents.str(); |
93 base::FilePath file_path = | 142 base::FilePath file_path = |
94 scope->settings()->build_settings()->GetFullPath(source_file); | 143 scope->settings()->build_settings()->GetFullPath(source_file); |
95 | 144 |
96 // Make sure we're not replacing the same contents. | 145 // Make sure we're not replacing the same contents. |
97 if (!WriteFileIfChanged(file_path, contents.str(), err)) | 146 std::string existing_contents; |
98 *err = Err(function->function(), err->message(), err->help_text()); | 147 if (base::ReadFileToString(file_path, &existing_contents) && |
| 148 existing_contents == new_contents) |
| 149 return Value(); // Nothing to do. |
99 | 150 |
| 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 } |
100 return Value(); | 165 return Value(); |
101 } | 166 } |
102 | 167 |
103 } // namespace functions | 168 } // namespace functions |
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