Add base::ExecutableExistsInPath

base/files/file_util.h

 // Copyright (c) 2012 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILES_FILE_UTIL_H_
 #define BASE_FILES_FILE_UTIL_H_
 
@@ skipping 20 matching lines @@
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 #endif
 
 namespace base {
 
 class Time;
+class Environment;

[Lei Zhang, 2016/06/23 19:17:06]

nit: alphabetical order

[Tom (Use chromium acct), 2016/06/23 21:55:12]

Done.

 
 //-----------------------------------------------------------------------------
 // Functions that involve filesystem access or modification:
 
 // Returns an absolute version of a relative path. Returns an empty path on
 // error. On POSIX, this function fails if the path does not exist. This
 // function can result in I/O so it can be slow.
 BASE_EXPORT FilePath MakeAbsoluteFilePath(const FilePath& input);
 
 // Returns the total number of bytes used by all the files under |root_path|.
@@ skipping 141 matching lines @@
 };
 
 // Reads the permission of the given |path|, storing the file permission
 // bits in |mode|. If |path| is symbolic link, |mode| is the permission of
 // a file which the symlink points to.
 BASE_EXPORT bool GetPosixFilePermissions(const FilePath& path, int* mode);
 // Sets the permission of the given |path|. If |path| is symbolic link, sets
 // the permission of a file which the symlink points to.
 BASE_EXPORT bool SetPosixFilePermissions(const FilePath& path, int mode);
 
+// Returns true iff |executable| can be found in any directory specified by the
+// $PATH environment variable.

[Lei Zhang, 2016/06/23 19:17:06]

... environment variable in |env|.

[Tom (Use chromium acct), 2016/06/23 21:55:12]

Done.

+BASE_EXPORT bool ExecutableExistsInPath(Environment* env,
+                                        const FilePath::StringType& executable);
+
 #endif  // OS_POSIX
 
 // Returns true if the given directory is empty
 BASE_EXPORT bool IsDirectoryEmpty(const FilePath& dir_path);
 
 // Get the temporary directory provided by the system.
 //
 // WARNING: In general, you should use CreateTemporaryFile variants below
 // instead of this function. Those variants will ensure that the proper
 // permissions are set so that other users on the system can't edit them while
@@ skipping 223 matching lines @@
 // This function simulates Move(), but unlike Move() it works across volumes.
 // This function is not transactional.
 BASE_EXPORT bool CopyAndDeleteDirectory(const FilePath& from_path,
                                         const FilePath& to_path);
 #endif  // defined(OS_WIN)
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_UTIL_H_