From: Björn Schäpers <bjo...@hazardy.de>
This fixes i.e. https://github.com/msys2/MSYS2-packages/issues/1937
I don't know if I picked the right way to do it.
When acceptable I think the declaration should be moved into
ops-common.h, since then we could use stat_type and also use that in the
commonly used function.
Manually tested on i686-w64-mingw32.
-- >8 --
libstdc++: Fix overwriting files on windows
The inodes have no meaning on windows, thus all files have an inode of
0. Use a differenz approach to identify equivalent files. As a result
std::filesystem::copy_file did not honor
copy_options::overwrite_existing. Factored the method out of
std::filesystem::equivalent.
libstdc++-v3/Changelog:
* include/bits/fs_ops.h: Add declaration of
__detail::equivalent_win32.
* src/c++17/fs_ops.cc (__detail::equivalent_win32): Implement it
(fs::equivalent): Use __detail::equivalent_win32, factored the
old test out.
* src/filesystem/ops-common.h (_GLIBCXX_FILESYSTEM_IS_WINDOWS):
Use the function.
Signed-off-by: Björn Schäpers <bjo...@hazardy.de>
---
libstdc++-v3/include/bits/fs_ops.h | 8 +++
libstdc++-v3/src/c++17/fs_ops.cc | 79 +++++++++++++-----------
libstdc++-v3/src/filesystem/ops-common.h | 10 ++-
3 files changed, 60 insertions(+), 37 deletions(-)
diff --git a/libstdc++-v3/include/bits/fs_ops.h
b/libstdc++-v3/include/bits/fs_ops.h
index 90650c47b46..d10b78a4bdd 100644
--- a/libstdc++-v3/include/bits/fs_ops.h
+++ b/libstdc++-v3/include/bits/fs_ops.h
@@ -40,6 +40,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace filesystem
{
+#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+namespace __detail
+{
+ bool
+ equivalent_win32(const wchar_t* p1, const wchar_t* p2, error_code& ec);
+} // namespace __detail
+#endif //_GLIBCXX_FILESYSTEM_IS_WINDOWS
+
/** @addtogroup filesystem
* @{
*/
diff --git a/libstdc++-v3/src/c++17/fs_ops.cc b/libstdc++-v3/src/c++17/fs_ops.cc
index 61df19753ef..3cc87d45237 100644
--- a/libstdc++-v3/src/c++17/fs_ops.cc
+++ b/libstdc++-v3/src/c++17/fs_ops.cc
@@ -67,6 +67,49 @@
namespace fs = std::filesystem;
namespace posix = std::filesystem::__gnu_posix;
+#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+bool
+fs::__detail::equivalent_win32(const wchar_t* p1, const wchar_t* p2,
+ error_code& ec)
+{
+ struct auto_handle {
+ explicit auto_handle(const path& p_)
+ : handle(CreateFileW(p_.c_str(), 0,
+ FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
+ 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0))
+ { }
+
+ ~auto_handle()
+ { if (*this) CloseHandle(handle); }
+
+ explicit operator bool() const
+ { return handle != INVALID_HANDLE_VALUE; }
+
+ bool get_info()
+ { return GetFileInformationByHandle(handle, &info); }
+
+ HANDLE handle;
+ BY_HANDLE_FILE_INFORMATION info;
+ };
+ auto_handle h1(p1);
+ auto_handle h2(p2);
+ if (!h1 || !h2)
+ {
+ if (!h1 && !h2)
+ ec = __last_system_error();
+ return false;
+ }
+ if (!h1.get_info() || !h2.get_info())
+ {
+ ec = __last_system_error();
+ return false;
+ }
+ return h1.info.dwVolumeSerialNumber == h2.info.dwVolumeSerialNumber
+ && h1.info.nFileIndexHigh == h2.info.nFileIndexHigh
+ && h1.info.nFileIndexLow == h2.info.nFileIndexLow;
+}
+#endif //_GLIBCXX_FILESYSTEM_IS_WINDOWS
+
fs::path
fs::absolute(const path& p)
{
@@ -858,41 +901,7 @@ fs::equivalent(const path& p1, const path& p2, error_code&
ec) noexcept
if (st1.st_mode != st2.st_mode || st1.st_dev != st2.st_dev)
return false;
- struct auto_handle {
- explicit auto_handle(const path& p_)
- : handle(CreateFileW(p_.c_str(), 0,
- FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
- 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0))
- { }
-
- ~auto_handle()
- { if (*this) CloseHandle(handle); }
-
- explicit operator bool() const
- { return handle != INVALID_HANDLE_VALUE; }
-
- bool get_info()
- { return GetFileInformationByHandle(handle, &info); }
-
- HANDLE handle;
- BY_HANDLE_FILE_INFORMATION info;
- };
- auto_handle h1(p1);
- auto_handle h2(p2);
- if (!h1 || !h2)
- {
- if (!h1 && !h2)
- ec = __last_system_error();
- return false;
- }
- if (!h1.get_info() || !h2.get_info())
- {
- ec = __last_system_error();
- return false;
- }
- return h1.info.dwVolumeSerialNumber == h2.info.dwVolumeSerialNumber
- && h1.info.nFileIndexHigh == h2.info.nFileIndexHigh
- && h1.info.nFileIndexLow == h2.info.nFileIndexLow;
+ return __detail::equivalent_win32(p1.c_str(), p2.c_str(), ec);
#else
return st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino;
#endif
diff --git a/libstdc++-v3/src/filesystem/ops-common.h
b/libstdc++-v3/src/filesystem/ops-common.h
index d917fddbeb1..7e67286bd01 100644
--- a/libstdc++-v3/src/filesystem/ops-common.h
+++ b/libstdc++-v3/src/filesystem/ops-common.h
@@ -489,8 +489,14 @@ _GLIBCXX_BEGIN_NAMESPACE_FILESYSTEM
return false;
}
- if (to_st->st_dev == from_st->st_dev
- && to_st->st_ino == from_st->st_ino)
+#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+ // st_ino is not set, so can't be used to distinguish files
+ std::error_code not_used;
+ if (st1.st_mode != st2.st_mode || st1.st_dev != st2.st_dev ||
+ fs::__detail::equivalent_win32(from, to, not_used))
+#else
+ if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
+#endif
{
ec = std::make_error_code(std::errc::file_exists);
return false;
