Distinguish macOS aliases from normal symbolic links

The deprecated Carbon function FSIsAliasFile() returned isAlias only for
actual aliases, whereas the replacement CFURLCopyResourcePropertyForKey
with kCFURLIsAliasFileKey returns true for both aliases and symbolic
links.

Since we didn't explicitly check for AliasType in any of our internal
code, or or any of the public API, the distinction did not cause any
issues, but if we want to expose QFileInfo::isAlias() we need to fix
this.

Change-Id: I29f795d55fe40898de319aa1cb0a4a1b5646bbd6
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 34b5e38f207e092f89bb18aa0e69336b70de5247)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesystemengine_unix.cpp
index 26c5af2825..437375e128 100644
--- a/src/corelib/io/qfilesystemengine_unix.cpp
+++ b/src/corelib/io/qfilesystemengine_unix.cpp
@@ -887,6 +887,8 @@ bool QFileSystemEngine::fillMetaData(const QFileSystemEntry &entry, QFileSystemM
         if (!data.hasFlags(QFileSystemMetaData::DirectoryType))
             what |= QFileSystemMetaData::DirectoryType;
     }
+    if (what & QFileSystemMetaData::AliasType)
+        what |= QFileSystemMetaData::LinkType;
 #endif
 #ifdef UF_HIDDEN
     if (what & QFileSystemMetaData::HiddenAttribute) {
@@ -1022,8 +1024,11 @@ bool QFileSystemEngine::fillMetaData(const QFileSystemEntry &entry, QFileSystemM
 
 #if defined(Q_OS_DARWIN)
     if (what & QFileSystemMetaData::AliasType) {
-        if (entryErrno == 0 && hasResourcePropertyFlag(data, entry, kCFURLIsAliasFileKey))
-            data.entryFlags |= QFileSystemMetaData::AliasType;
+        if (entryErrno == 0 && hasResourcePropertyFlag(data, entry, kCFURLIsAliasFileKey)) {
+            // kCFURLIsAliasFileKey includes symbolic links, so filter those out
+            if (!(data.entryFlags & QFileSystemMetaData::LinkType))
+                data.entryFlags |= QFileSystemMetaData::AliasType;
+        }
         data.knownFlagsMask |= QFileSystemMetaData::AliasType;
     }