diff options
| author | Ryan Chu <ryan.chu@qt.io> | 2019-08-21 16:18:07 +0200 |
|---|---|---|
| committer | Volker Hilsheimer <volker.hilsheimer@qt.io> | 2019-11-09 00:47:45 +0100 |
| commit | 004e3e0dc2cab4a4534d2ed3ace41aad6bfbe45d (patch) | |
| tree | 89648f07e55a607a7d38e0f7b6eecb81b5607a66 /src/corelib/io/qfilesystemmetadata_p.h | |
| parent | b81863cfad1ca1e5825eaffb50a9b2fe2da51c7f (diff) | |
Make Qt aware of NTFS Junctions on Windows
On NTFS, a junction point can be created and deleted by the mklink and
rmdir commands, respectively. If a directory is not identified
correctly as a junction, then applications will likely try to remove
it using recursive methods, leading to fatal data loss.
With this change, Qt can identify file system entries as junctions,
allowing applications to use the correct file system operation to
remove it.
The test needs to delay the cleaning up of junctions and files it
creates until the checks are complete; since they might fail and make
the test function return prematurely, use a scope guard.
[ChangeLog][QtCore][QFileInfo] Add QFileInfo::isJunction so that
applications can recognize NTFS file system entries as junctions
Task-number: QTBUG-75869
Change-Id: I3c208245afbd9fb7555515fb776ff63b133ca858
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Diffstat (limited to 'src/corelib/io/qfilesystemmetadata_p.h')
| -rw-r--r-- | src/corelib/io/qfilesystemmetadata_p.h | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/src/corelib/io/qfilesystemmetadata_p.h b/src/corelib/io/qfilesystemmetadata_p.h index 81f4b3ba13..275a4bf8d0 100644 --- a/src/corelib/io/qfilesystemmetadata_p.h +++ b/src/corelib/io/qfilesystemmetadata_p.h @@ -111,8 +111,10 @@ public: AliasType = 0x0, #endif #if defined(Q_OS_WIN) + JunctionType = 0x04000000, WinLnkType = 0x08000000, // Note: Uses the same position for AliasType on Mac #else + JunctionType = 0x0, WinLnkType = 0x0, #endif SequentialType = 0x00800000, // Note: overlaps with QAbstractFileEngine::RootFlag @@ -205,8 +207,10 @@ public: bool wasDeleted() const { return (entryFlags & WasDeletedAttribute); } #if defined(Q_OS_WIN) bool isLnkFile() const { return (entryFlags & WinLnkType); } + bool isJunction() const { return (entryFlags & JunctionType); } #else bool isLnkFile() const { return false; } + bool isJunction() const { return false; } #endif qint64 size() const { return size_; } @@ -356,9 +360,15 @@ inline void QFileSystemMetaData::fillFromFindData(WIN32_FIND_DATA &findData, boo if (setLinkType) { knownFlagsMask |= LinkType; entryFlags &= ~LinkType; - if ((fileAttribute_ & FILE_ATTRIBUTE_REPARSE_POINT) - && (findData.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) { - entryFlags |= LinkType; + if (fileAttribute_ & FILE_ATTRIBUTE_REPARSE_POINT) { + if (findData.dwReserved0 == IO_REPARSE_TAG_SYMLINK) { + entryFlags |= LinkType; +#if defined(IO_REPARSE_TAG_MOUNT_POINT) + } else if ((fileAttribute_ & FILE_ATTRIBUTE_DIRECTORY) + && (findData.dwReserved0 == IO_REPARSE_TAG_MOUNT_POINT)) { + entryFlags |= JunctionType; +#endif + } } } } |