1 // Copyright (c) 2012 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.
5 #include "base/files/file_util.h"
15 #include <sys/errno.h>
17 #include <sys/param.h>
20 #include <sys/types.h>
24 #if defined(OS_MACOSX)
25 #include <AvailabilityMacros.h>
26 #include "base/mac/foundation_util.h"
27 #elif !defined(OS_CHROMEOS) && defined(USE_GLIB)
28 #include <glib.h> // for g_get_home_dir()
33 #include "base/basictypes.h"
34 #include "base/files/file_enumerator.h"
35 #include "base/files/file_path.h"
36 #include "base/files/scoped_file.h"
37 #include "base/logging.h"
38 #include "base/memory/scoped_ptr.h"
39 #include "base/memory/singleton.h"
40 #include "base/path_service.h"
41 #include "base/posix/eintr_wrapper.h"
42 #include "base/stl_util.h"
43 #include "base/strings/string_util.h"
44 #include "base/strings/stringprintf.h"
45 #include "base/strings/sys_string_conversions.h"
46 #include "base/strings/utf_string_conversions.h"
47 #include "base/sys_info.h"
48 #include "base/threading/thread_restrictions.h"
49 #include "base/time/time.h"
51 #if defined(OS_ANDROID)
52 #include "base/android/content_uri_utils.h"
53 #include "base/os_compat_android.h"
64 #if defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
65 static int CallStat(const char *path
, stat_wrapper_t
*sb
) {
66 ThreadRestrictions::AssertIOAllowed();
67 return stat(path
, sb
);
69 static int CallLstat(const char *path
, stat_wrapper_t
*sb
) {
70 ThreadRestrictions::AssertIOAllowed();
71 return lstat(path
, sb
);
73 #else // defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
74 static int CallStat(const char *path
, stat_wrapper_t
*sb
) {
75 ThreadRestrictions::AssertIOAllowed();
76 return stat64(path
, sb
);
78 static int CallLstat(const char *path
, stat_wrapper_t
*sb
) {
79 ThreadRestrictions::AssertIOAllowed();
80 return lstat64(path
, sb
);
82 #endif // !(defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL))
84 // Helper for NormalizeFilePath(), defined below.
85 bool RealPath(const FilePath
& path
, FilePath
* real_path
) {
86 ThreadRestrictions::AssertIOAllowed(); // For realpath().
87 FilePath::CharType buf
[PATH_MAX
];
88 if (!realpath(path
.value().c_str(), buf
))
91 *real_path
= FilePath(buf
);
95 // Helper for VerifyPathControlledByUser.
96 bool VerifySpecificPathControlledByUser(const FilePath
& path
,
98 const std::set
<gid_t
>& group_gids
) {
99 stat_wrapper_t stat_info
;
100 if (CallLstat(path
.value().c_str(), &stat_info
) != 0) {
101 DPLOG(ERROR
) << "Failed to get information on path "
106 if (S_ISLNK(stat_info
.st_mode
)) {
107 DLOG(ERROR
) << "Path " << path
.value()
108 << " is a symbolic link.";
112 if (stat_info
.st_uid
!= owner_uid
) {
113 DLOG(ERROR
) << "Path " << path
.value()
114 << " is owned by the wrong user.";
118 if ((stat_info
.st_mode
& S_IWGRP
) &&
119 !ContainsKey(group_gids
, stat_info
.st_gid
)) {
120 DLOG(ERROR
) << "Path " << path
.value()
121 << " is writable by an unprivileged group.";
125 if (stat_info
.st_mode
& S_IWOTH
) {
126 DLOG(ERROR
) << "Path " << path
.value()
127 << " is writable by any user.";
134 std::string
TempFileName() {
135 #if defined(OS_MACOSX)
136 return StringPrintf(".%s.XXXXXX", base::mac::BaseBundleID());
139 #if defined(GOOGLE_CHROME_BUILD)
140 return std::string(".com.google.Chrome.XXXXXX");
142 return std::string(".org.chromium.Chromium.XXXXXX");
146 // Creates and opens a temporary file in |directory|, returning the
147 // file descriptor. |path| is set to the temporary file path.
148 // This function does NOT unlink() the file.
149 int CreateAndOpenFdForTemporaryFile(FilePath directory
, FilePath
* path
) {
150 ThreadRestrictions::AssertIOAllowed(); // For call to mkstemp().
151 *path
= directory
.Append(base::TempFileName());
152 const std::string
& tmpdir_string
= path
->value();
153 // this should be OK since mkstemp just replaces characters in place
154 char* buffer
= const_cast<char*>(tmpdir_string
.c_str());
156 return HANDLE_EINTR(mkstemp(buffer
));
159 #if defined(OS_LINUX)
160 // Determine if /dev/shm files can be mapped and then mprotect'd PROT_EXEC.
161 // This depends on the mount options used for /dev/shm, which vary among
162 // different Linux distributions and possibly local configuration. It also
163 // depends on details of kernel--ChromeOS uses the noexec option for /dev/shm
164 // but its kernel allows mprotect with PROT_EXEC anyway.
165 bool DetermineDevShmExecutable() {
169 ScopedFD
fd(CreateAndOpenFdForTemporaryFile(FilePath("/dev/shm"), &path
));
171 DeleteFile(path
, false);
172 long sysconf_result
= sysconf(_SC_PAGESIZE
);
173 CHECK_GE(sysconf_result
, 0);
174 size_t pagesize
= static_cast<size_t>(sysconf_result
);
175 CHECK_GE(sizeof(pagesize
), sizeof(sysconf_result
));
176 void* mapping
= mmap(NULL
, pagesize
, PROT_READ
, MAP_SHARED
, fd
.get(), 0);
177 if (mapping
!= MAP_FAILED
) {
178 if (mprotect(mapping
, pagesize
, PROT_READ
| PROT_EXEC
) == 0)
180 munmap(mapping
, pagesize
);
185 #endif // defined(OS_LINUX)
189 FilePath
MakeAbsoluteFilePath(const FilePath
& input
) {
190 ThreadRestrictions::AssertIOAllowed();
191 char full_path
[PATH_MAX
];
192 if (realpath(input
.value().c_str(), full_path
) == NULL
)
194 return FilePath(full_path
);
197 // TODO(erikkay): The Windows version of this accepts paths like "foo/bar/*"
198 // which works both with and without the recursive flag. I'm not sure we need
199 // that functionality. If not, remove from file_util_win.cc, otherwise add it
201 bool DeleteFile(const FilePath
& path
, bool recursive
) {
202 ThreadRestrictions::AssertIOAllowed();
203 const char* path_str
= path
.value().c_str();
204 stat_wrapper_t file_info
;
205 int test
= CallLstat(path_str
, &file_info
);
207 // The Windows version defines this condition as success.
208 bool ret
= (errno
== ENOENT
|| errno
== ENOTDIR
);
211 if (!S_ISDIR(file_info
.st_mode
))
212 return (unlink(path_str
) == 0);
214 return (rmdir(path_str
) == 0);
217 std::stack
<std::string
> directories
;
218 directories
.push(path
.value());
219 FileEnumerator
traversal(path
, true,
220 FileEnumerator::FILES
| FileEnumerator::DIRECTORIES
|
221 FileEnumerator::SHOW_SYM_LINKS
);
222 for (FilePath current
= traversal
.Next(); success
&& !current
.empty();
223 current
= traversal
.Next()) {
224 if (traversal
.GetInfo().IsDirectory())
225 directories
.push(current
.value());
227 success
= (unlink(current
.value().c_str()) == 0);
230 while (success
&& !directories
.empty()) {
231 FilePath dir
= FilePath(directories
.top());
233 success
= (rmdir(dir
.value().c_str()) == 0);
238 bool ReplaceFile(const FilePath
& from_path
,
239 const FilePath
& to_path
,
240 File::Error
* error
) {
241 ThreadRestrictions::AssertIOAllowed();
242 if (rename(from_path
.value().c_str(), to_path
.value().c_str()) == 0)
245 *error
= File::OSErrorToFileError(errno
);
249 bool CopyDirectory(const FilePath
& from_path
,
250 const FilePath
& to_path
,
252 ThreadRestrictions::AssertIOAllowed();
253 // Some old callers of CopyDirectory want it to support wildcards.
254 // After some discussion, we decided to fix those callers.
255 // Break loudly here if anyone tries to do this.
256 DCHECK(to_path
.value().find('*') == std::string::npos
);
257 DCHECK(from_path
.value().find('*') == std::string::npos
);
259 if (from_path
.value().size() >= PATH_MAX
) {
263 // This function does not properly handle destinations within the source
264 FilePath real_to_path
= to_path
;
265 if (PathExists(real_to_path
)) {
266 real_to_path
= MakeAbsoluteFilePath(real_to_path
);
267 if (real_to_path
.empty())
270 real_to_path
= MakeAbsoluteFilePath(real_to_path
.DirName());
271 if (real_to_path
.empty())
274 FilePath real_from_path
= MakeAbsoluteFilePath(from_path
);
275 if (real_from_path
.empty())
277 if (real_to_path
.value().size() >= real_from_path
.value().size() &&
278 real_to_path
.value().compare(0, real_from_path
.value().size(),
279 real_from_path
.value()) == 0) {
283 int traverse_type
= FileEnumerator::FILES
| FileEnumerator::SHOW_SYM_LINKS
;
285 traverse_type
|= FileEnumerator::DIRECTORIES
;
286 FileEnumerator
traversal(from_path
, recursive
, traverse_type
);
288 // We have to mimic windows behavior here. |to_path| may not exist yet,
289 // start the loop with |to_path|.
290 struct stat from_stat
;
291 FilePath current
= from_path
;
292 if (stat(from_path
.value().c_str(), &from_stat
) < 0) {
293 DLOG(ERROR
) << "CopyDirectory() couldn't stat source directory: "
294 << from_path
.value() << " errno = " << errno
;
297 struct stat to_path_stat
;
298 FilePath from_path_base
= from_path
;
299 if (recursive
&& stat(to_path
.value().c_str(), &to_path_stat
) == 0 &&
300 S_ISDIR(to_path_stat
.st_mode
)) {
301 // If the destination already exists and is a directory, then the
302 // top level of source needs to be copied.
303 from_path_base
= from_path
.DirName();
306 // The Windows version of this function assumes that non-recursive calls
307 // will always have a directory for from_path.
308 // TODO(maruel): This is not necessary anymore.
309 DCHECK(recursive
|| S_ISDIR(from_stat
.st_mode
));
312 while (success
&& !current
.empty()) {
313 // current is the source path, including from_path, so append
314 // the suffix after from_path to to_path to create the target_path.
315 FilePath
target_path(to_path
);
316 if (from_path_base
!= current
) {
317 if (!from_path_base
.AppendRelativePath(current
, &target_path
)) {
323 if (S_ISDIR(from_stat
.st_mode
)) {
324 if (mkdir(target_path
.value().c_str(), from_stat
.st_mode
& 01777) != 0 &&
326 DLOG(ERROR
) << "CopyDirectory() couldn't create directory: "
327 << target_path
.value() << " errno = " << errno
;
330 } else if (S_ISREG(from_stat
.st_mode
)) {
331 if (!CopyFile(current
, target_path
)) {
332 DLOG(ERROR
) << "CopyDirectory() couldn't create file: "
333 << target_path
.value();
337 DLOG(WARNING
) << "CopyDirectory() skipping non-regular file: "
341 current
= traversal
.Next();
342 if (!current
.empty())
343 from_stat
= traversal
.GetInfo().stat();
349 bool PathExists(const FilePath
& path
) {
350 ThreadRestrictions::AssertIOAllowed();
351 #if defined(OS_ANDROID)
352 if (path
.IsContentUri()) {
353 return ContentUriExists(path
);
356 return access(path
.value().c_str(), F_OK
) == 0;
359 bool PathIsWritable(const FilePath
& path
) {
360 ThreadRestrictions::AssertIOAllowed();
361 return access(path
.value().c_str(), W_OK
) == 0;
364 bool DirectoryExists(const FilePath
& path
) {
365 ThreadRestrictions::AssertIOAllowed();
366 stat_wrapper_t file_info
;
367 if (CallStat(path
.value().c_str(), &file_info
) == 0)
368 return S_ISDIR(file_info
.st_mode
);
372 bool ReadFromFD(int fd
, char* buffer
, size_t bytes
) {
373 size_t total_read
= 0;
374 while (total_read
< bytes
) {
376 HANDLE_EINTR(read(fd
, buffer
+ total_read
, bytes
- total_read
));
379 total_read
+= bytes_read
;
381 return total_read
== bytes
;
384 bool CreateSymbolicLink(const FilePath
& target_path
,
385 const FilePath
& symlink_path
) {
386 DCHECK(!symlink_path
.empty());
387 DCHECK(!target_path
.empty());
388 return ::symlink(target_path
.value().c_str(),
389 symlink_path
.value().c_str()) != -1;
392 bool ReadSymbolicLink(const FilePath
& symlink_path
, FilePath
* target_path
) {
393 DCHECK(!symlink_path
.empty());
396 ssize_t count
= ::readlink(symlink_path
.value().c_str(), buf
, arraysize(buf
));
399 target_path
->clear();
403 *target_path
= FilePath(FilePath::StringType(buf
, count
));
407 bool GetPosixFilePermissions(const FilePath
& path
, int* mode
) {
408 ThreadRestrictions::AssertIOAllowed();
411 stat_wrapper_t file_info
;
412 // Uses stat(), because on symbolic link, lstat() does not return valid
413 // permission bits in st_mode
414 if (CallStat(path
.value().c_str(), &file_info
) != 0)
417 *mode
= file_info
.st_mode
& FILE_PERMISSION_MASK
;
421 bool SetPosixFilePermissions(const FilePath
& path
,
423 ThreadRestrictions::AssertIOAllowed();
424 DCHECK((mode
& ~FILE_PERMISSION_MASK
) == 0);
426 // Calls stat() so that we can preserve the higher bits like S_ISGID.
427 stat_wrapper_t stat_buf
;
428 if (CallStat(path
.value().c_str(), &stat_buf
) != 0)
431 // Clears the existing permission bits, and adds the new ones.
432 mode_t updated_mode_bits
= stat_buf
.st_mode
& ~FILE_PERMISSION_MASK
;
433 updated_mode_bits
|= mode
& FILE_PERMISSION_MASK
;
435 if (HANDLE_EINTR(chmod(path
.value().c_str(), updated_mode_bits
)) != 0)
441 #if !defined(OS_MACOSX)
442 // This is implemented in file_util_mac.mm for Mac.
443 bool GetTempDir(FilePath
* path
) {
444 const char* tmp
= getenv("TMPDIR");
446 *path
= FilePath(tmp
);
448 #if defined(OS_ANDROID)
449 return PathService::Get(base::DIR_CACHE
, path
);
451 *path
= FilePath("/tmp");
456 #endif // !defined(OS_MACOSX)
458 #if !defined(OS_MACOSX) // Mac implementation is in file_util_mac.mm.
459 FilePath
GetHomeDir() {
460 #if defined(OS_CHROMEOS)
461 if (SysInfo::IsRunningOnChromeOS()) {
462 // On Chrome OS chrome::DIR_USER_DATA is overridden with a primary user
463 // homedir once it becomes available. Return / as the safe option.
464 return FilePath("/");
468 const char* home_dir
= getenv("HOME");
469 if (home_dir
&& home_dir
[0])
470 return FilePath(home_dir
);
472 #if defined(OS_ANDROID)
473 DLOG(WARNING
) << "OS_ANDROID: Home directory lookup not yet implemented.";
474 #elif defined(USE_GLIB) && !defined(OS_CHROMEOS)
475 // g_get_home_dir calls getpwent, which can fall through to LDAP calls so
476 // this may do I/O. However, it should be rare that $HOME is not defined and
477 // this is typically called from the path service which has no threading
478 // restrictions. The path service will cache the result which limits the
479 // badness of blocking on I/O. As a result, we don't have a thread
481 home_dir
= g_get_home_dir();
482 if (home_dir
&& home_dir
[0])
483 return FilePath(home_dir
);
491 return FilePath("/tmp");
493 #endif // !defined(OS_MACOSX)
495 bool CreateTemporaryFile(FilePath
* path
) {
496 ThreadRestrictions::AssertIOAllowed(); // For call to close().
498 if (!GetTempDir(&directory
))
500 int fd
= CreateAndOpenFdForTemporaryFile(directory
, path
);
507 FILE* CreateAndOpenTemporaryFileInDir(const FilePath
& dir
, FilePath
* path
) {
508 int fd
= CreateAndOpenFdForTemporaryFile(dir
, path
);
512 FILE* file
= fdopen(fd
, "a+");
518 bool CreateTemporaryFileInDir(const FilePath
& dir
, FilePath
* temp_file
) {
519 ThreadRestrictions::AssertIOAllowed(); // For call to close().
520 int fd
= CreateAndOpenFdForTemporaryFile(dir
, temp_file
);
521 return ((fd
>= 0) && !IGNORE_EINTR(close(fd
)));
524 static bool CreateTemporaryDirInDirImpl(const FilePath
& base_dir
,
525 const FilePath::StringType
& name_tmpl
,
527 ThreadRestrictions::AssertIOAllowed(); // For call to mkdtemp().
528 DCHECK(name_tmpl
.find("XXXXXX") != FilePath::StringType::npos
)
529 << "Directory name template must contain \"XXXXXX\".";
531 FilePath sub_dir
= base_dir
.Append(name_tmpl
);
532 std::string sub_dir_string
= sub_dir
.value();
534 // this should be OK since mkdtemp just replaces characters in place
535 char* buffer
= const_cast<char*>(sub_dir_string
.c_str());
536 char* dtemp
= mkdtemp(buffer
);
538 DPLOG(ERROR
) << "mkdtemp";
541 *new_dir
= FilePath(dtemp
);
545 bool CreateTemporaryDirInDir(const FilePath
& base_dir
,
546 const FilePath::StringType
& prefix
,
548 FilePath::StringType mkdtemp_template
= prefix
;
549 mkdtemp_template
.append(FILE_PATH_LITERAL("XXXXXX"));
550 return CreateTemporaryDirInDirImpl(base_dir
, mkdtemp_template
, new_dir
);
553 bool CreateNewTempDirectory(const FilePath::StringType
& prefix
,
554 FilePath
* new_temp_path
) {
556 if (!GetTempDir(&tmpdir
))
559 return CreateTemporaryDirInDirImpl(tmpdir
, TempFileName(), new_temp_path
);
562 bool CreateDirectoryAndGetError(const FilePath
& full_path
,
563 File::Error
* error
) {
564 ThreadRestrictions::AssertIOAllowed(); // For call to mkdir().
565 std::vector
<FilePath
> subpaths
;
567 // Collect a list of all parent directories.
568 FilePath last_path
= full_path
;
569 subpaths
.push_back(full_path
);
570 for (FilePath path
= full_path
.DirName();
571 path
.value() != last_path
.value(); path
= path
.DirName()) {
572 subpaths
.push_back(path
);
576 // Iterate through the parents and create the missing ones.
577 for (std::vector
<FilePath
>::reverse_iterator i
= subpaths
.rbegin();
578 i
!= subpaths
.rend(); ++i
) {
579 if (DirectoryExists(*i
))
581 if (mkdir(i
->value().c_str(), 0700) == 0)
583 // Mkdir failed, but it might have failed with EEXIST, or some other error
584 // due to the the directory appearing out of thin air. This can occur if
585 // two processes are trying to create the same file system tree at the same
586 // time. Check to see if it exists and make sure it is a directory.
587 int saved_errno
= errno
;
588 if (!DirectoryExists(*i
)) {
590 *error
= File::OSErrorToFileError(saved_errno
);
597 bool NormalizeFilePath(const FilePath
& path
, FilePath
* normalized_path
) {
598 FilePath real_path_result
;
599 if (!RealPath(path
, &real_path_result
))
602 // To be consistant with windows, fail if |real_path_result| is a
604 stat_wrapper_t file_info
;
605 if (CallStat(real_path_result
.value().c_str(), &file_info
) != 0 ||
606 S_ISDIR(file_info
.st_mode
))
609 *normalized_path
= real_path_result
;
613 // TODO(rkc): Refactor GetFileInfo and FileEnumerator to handle symlinks
614 // correctly. http://code.google.com/p/chromium-os/issues/detail?id=15948
615 bool IsLink(const FilePath
& file_path
) {
617 // If we can't lstat the file, it's safe to assume that the file won't at
618 // least be a 'followable' link.
619 if (CallLstat(file_path
.value().c_str(), &st
) != 0)
622 if (S_ISLNK(st
.st_mode
))
628 bool GetFileInfo(const FilePath
& file_path
, File::Info
* results
) {
629 stat_wrapper_t file_info
;
630 #if defined(OS_ANDROID)
631 if (file_path
.IsContentUri()) {
632 File file
= OpenContentUriForRead(file_path
);
635 return file
.GetInfo(results
);
637 #endif // defined(OS_ANDROID)
638 if (CallStat(file_path
.value().c_str(), &file_info
) != 0)
640 #if defined(OS_ANDROID)
642 #endif // defined(OS_ANDROID)
644 results
->FromStat(file_info
);
648 FILE* OpenFile(const FilePath
& filename
, const char* mode
) {
649 ThreadRestrictions::AssertIOAllowed();
652 result
= fopen(filename
.value().c_str(), mode
);
653 } while (!result
&& errno
== EINTR
);
657 // NaCl doesn't implement system calls to open files directly.
658 #if !defined(OS_NACL)
659 FILE* FileToFILE(File file
, const char* mode
) {
660 FILE* stream
= fdopen(file
.GetPlatformFile(), mode
);
662 file
.TakePlatformFile();
665 #endif // !defined(OS_NACL)
667 int ReadFile(const FilePath
& filename
, char* data
, int max_size
) {
668 ThreadRestrictions::AssertIOAllowed();
669 int fd
= HANDLE_EINTR(open(filename
.value().c_str(), O_RDONLY
));
673 ssize_t bytes_read
= HANDLE_EINTR(read(fd
, data
, max_size
));
674 if (IGNORE_EINTR(close(fd
)) < 0)
679 int WriteFile(const FilePath
& filename
, const char* data
, int size
) {
680 ThreadRestrictions::AssertIOAllowed();
681 int fd
= HANDLE_EINTR(creat(filename
.value().c_str(), 0640));
685 int bytes_written
= WriteFileDescriptor(fd
, data
, size
);
686 if (IGNORE_EINTR(close(fd
)) < 0)
688 return bytes_written
;
691 int WriteFileDescriptor(const int fd
, const char* data
, int size
) {
692 // Allow for partial writes.
693 ssize_t bytes_written_total
= 0;
694 for (ssize_t bytes_written_partial
= 0; bytes_written_total
< size
;
695 bytes_written_total
+= bytes_written_partial
) {
696 bytes_written_partial
=
697 HANDLE_EINTR(write(fd
, data
+ bytes_written_total
,
698 size
- bytes_written_total
));
699 if (bytes_written_partial
< 0)
703 return bytes_written_total
;
706 int AppendToFile(const FilePath
& filename
, const char* data
, int size
) {
707 ThreadRestrictions::AssertIOAllowed();
708 int fd
= HANDLE_EINTR(open(filename
.value().c_str(), O_WRONLY
| O_APPEND
));
712 int bytes_written
= WriteFileDescriptor(fd
, data
, size
);
713 if (IGNORE_EINTR(close(fd
)) < 0)
715 return bytes_written
;
718 // Gets the current working directory for the process.
719 bool GetCurrentDirectory(FilePath
* dir
) {
720 // getcwd can return ENOENT, which implies it checks against the disk.
721 ThreadRestrictions::AssertIOAllowed();
723 char system_buffer
[PATH_MAX
] = "";
724 if (!getcwd(system_buffer
, sizeof(system_buffer
))) {
728 *dir
= FilePath(system_buffer
);
732 // Sets the current working directory for the process.
733 bool SetCurrentDirectory(const FilePath
& path
) {
734 ThreadRestrictions::AssertIOAllowed();
735 int ret
= chdir(path
.value().c_str());
739 bool VerifyPathControlledByUser(const FilePath
& base
,
740 const FilePath
& path
,
742 const std::set
<gid_t
>& group_gids
) {
743 if (base
!= path
&& !base
.IsParent(path
)) {
744 DLOG(ERROR
) << "|base| must be a subdirectory of |path|. base = \""
745 << base
.value() << "\", path = \"" << path
.value() << "\"";
749 std::vector
<FilePath::StringType
> base_components
;
750 std::vector
<FilePath::StringType
> path_components
;
752 base
.GetComponents(&base_components
);
753 path
.GetComponents(&path_components
);
755 std::vector
<FilePath::StringType
>::const_iterator ib
, ip
;
756 for (ib
= base_components
.begin(), ip
= path_components
.begin();
757 ib
!= base_components
.end(); ++ib
, ++ip
) {
758 // |base| must be a subpath of |path|, so all components should match.
759 // If these CHECKs fail, look at the test that base is a parent of
760 // path at the top of this function.
761 DCHECK(ip
!= path_components
.end());
765 FilePath current_path
= base
;
766 if (!VerifySpecificPathControlledByUser(current_path
, owner_uid
, group_gids
))
769 for (; ip
!= path_components
.end(); ++ip
) {
770 current_path
= current_path
.Append(*ip
);
771 if (!VerifySpecificPathControlledByUser(
772 current_path
, owner_uid
, group_gids
))
778 #if defined(OS_MACOSX) && !defined(OS_IOS)
779 bool VerifyPathControlledByAdmin(const FilePath
& path
) {
780 const unsigned kRootUid
= 0;
781 const FilePath
kFileSystemRoot("/");
783 // The name of the administrator group on mac os.
784 const char* const kAdminGroupNames
[] = {
789 // Reading the groups database may touch the file system.
790 ThreadRestrictions::AssertIOAllowed();
792 std::set
<gid_t
> allowed_group_ids
;
793 for (int i
= 0, ie
= arraysize(kAdminGroupNames
); i
< ie
; ++i
) {
794 struct group
*group_record
= getgrnam(kAdminGroupNames
[i
]);
796 DPLOG(ERROR
) << "Could not get the group ID of group \""
797 << kAdminGroupNames
[i
] << "\".";
801 allowed_group_ids
.insert(group_record
->gr_gid
);
804 return VerifyPathControlledByUser(
805 kFileSystemRoot
, path
, kRootUid
, allowed_group_ids
);
807 #endif // defined(OS_MACOSX) && !defined(OS_IOS)
809 int GetMaximumPathComponentLength(const FilePath
& path
) {
810 ThreadRestrictions::AssertIOAllowed();
811 return pathconf(path
.value().c_str(), _PC_NAME_MAX
);
814 #if !defined(OS_ANDROID)
815 // This is implemented in file_util_android.cc for that platform.
816 bool GetShmemTempDir(bool executable
, FilePath
* path
) {
817 #if defined(OS_LINUX)
818 bool use_dev_shm
= true;
820 static const bool s_dev_shm_executable
= DetermineDevShmExecutable();
821 use_dev_shm
= s_dev_shm_executable
;
824 *path
= FilePath("/dev/shm");
828 return GetTempDir(path
);
830 #endif // !defined(OS_ANDROID)
832 // -----------------------------------------------------------------------------
836 bool MoveUnsafe(const FilePath
& from_path
, const FilePath
& to_path
) {
837 ThreadRestrictions::AssertIOAllowed();
838 // Windows compatibility: if to_path exists, from_path and to_path
839 // must be the same type, either both files, or both directories.
840 stat_wrapper_t to_file_info
;
841 if (CallStat(to_path
.value().c_str(), &to_file_info
) == 0) {
842 stat_wrapper_t from_file_info
;
843 if (CallStat(from_path
.value().c_str(), &from_file_info
) == 0) {
844 if (S_ISDIR(to_file_info
.st_mode
) != S_ISDIR(from_file_info
.st_mode
))
851 if (rename(from_path
.value().c_str(), to_path
.value().c_str()) == 0)
854 if (!CopyDirectory(from_path
, to_path
, true))
857 DeleteFile(from_path
, true);
861 #if !defined(OS_MACOSX)
862 // Mac has its own implementation, this is for all other Posix systems.
863 bool CopyFileUnsafe(const FilePath
& from_path
, const FilePath
& to_path
) {
864 ThreadRestrictions::AssertIOAllowed();
865 int infile
= HANDLE_EINTR(open(from_path
.value().c_str(), O_RDONLY
));
869 int outfile
= HANDLE_EINTR(creat(to_path
.value().c_str(), 0666));
875 const size_t kBufferSize
= 32768;
876 std::vector
<char> buffer(kBufferSize
);
880 ssize_t bytes_read
= HANDLE_EINTR(read(infile
, &buffer
[0], buffer
.size()));
881 if (bytes_read
< 0) {
887 // Allow for partial writes
888 ssize_t bytes_written_per_read
= 0;
890 ssize_t bytes_written_partial
= HANDLE_EINTR(write(
892 &buffer
[bytes_written_per_read
],
893 bytes_read
- bytes_written_per_read
));
894 if (bytes_written_partial
< 0) {
898 bytes_written_per_read
+= bytes_written_partial
;
899 } while (bytes_written_per_read
< bytes_read
);
902 if (IGNORE_EINTR(close(infile
)) < 0)
904 if (IGNORE_EINTR(close(outfile
)) < 0)
909 #endif // !defined(OS_MACOSX)
911 } // namespace internal