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Work around QFileSystemEngine behavior on VxWorks hostFs 

On VxWorks with hostFs (commonly used for debugging via Workbench),
using QFile::exists() triggers a statfs() call, which fails. This change
uses stat() check instead, which behaves more reliably in this context.
Additionally, VxWorks stat() still incorrectly reports that the file has
been deleted. This fix accounts for that false negative and avoids
treating the file as missing.

Task-number: QTBUG-139007
Pick-to: 6.8 6.9 6.10
Change-Id: Ie2cd277868e0d57bb8288271c8973da17162eef3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Karim Pinter 2025-09-04 14:52:36 +03:00
parent 20881debeb
commit b4c59c7d49
1 changed files with 26 additions and 18 deletions
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44
src/corelib/io/qfilesystemengine_unix.cpp
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@ -1026,28 +1026,36 @@ bool QFileSystemEngine::fillMetaData(const QFileSystemEntry &entry, QFileSystemM
// third, we try access(2)
if (what & (QFileSystemMetaData::UserPermissions | QFileSystemMetaData::ExistsAttribute)) {
#if defined(Q_OS_VXWORKS)
// on VxWorks if the filesystem is not POSIX, access() always returns false, despite the
// file is readable
struct statfs statBuf;
if (statfs(nativeFilePath, &statBuf) != 0) {
what &= ~QFileSystemMetaData::LinkType; // don't clear link: could be broken symlink
data.clearFlags(what);
return false;
}
if (statBuf.f_type != NFSV2_MAGIC && statBuf.f_type != NFSV3_MAGIC &&
statBuf.f_type != HRFS_MAGIC) {
if (statfs(nativeFilePath, &statBuf) == 0) {
if (statBuf.f_type != NFSV2_MAGIC && statBuf.f_type != NFSV3_MAGIC &&
statBuf.f_type != HRFS_MAGIC) {
#if __has_include(<dosFsLib.h>)
if (data.entryFlags & QFileSystemMetaData::OwnerWritePermission) {
data.entryFlags |= QFileSystemMetaData::UserWritePermission;
}
if (data.entryFlags & QFileSystemMetaData::OwnerExecutePermission) {
data.entryFlags |= QFileSystemMetaData::UserExecutePermission;
}
if (data.entryFlags & QFileSystemMetaData::OwnerWritePermission) {
data.entryFlags |= QFileSystemMetaData::UserWritePermission;
}
if (data.entryFlags & QFileSystemMetaData::OwnerExecutePermission) {
data.entryFlags |= QFileSystemMetaData::UserExecutePermission;
}
#endif
data.entryFlags |= QFileSystemMetaData::UserReadPermission |
QFileSystemMetaData::ExistsAttribute;
return true;
data.entryFlags |= QFileSystemMetaData::UserReadPermission |
QFileSystemMetaData::ExistsAttribute;
return true;
}
}
#if defined(QT_DEBUG)
else {
//on VxWorks hostfs, used for debugging, failes on statfs and falsely reports
//WasDeleted
statResult = QT_STAT(nativeFilePath, &statBuffer);
if (statResult == 0) {
data.entryFlags |= QFileSystemMetaData::UserReadPermission |
QFileSystemMetaData::ExistsAttribute;
data.entryFlags &= ~QFileSystemMetaData::WasDeletedAttribute;
return true;
}
}
#endif
#endif
// calculate user permissions
auto checkAccess = [&](QFileSystemMetaData::MetaDataFlag flag, int mode) {