[PATCH 0/2] MR3259: Add environment variable to isolate WINEPREFIX at creation

[Fabian Maurer (＠DarkShadow44)]

I'm aware that winecfg allows unlinking of symlinked folders, but this is very annoying when regularly recreating WINEPREFIXES. This change makes it easy to isolate those folders from the start.

[PATCH 1/2] shell32: Add environment variable to prevent symlinking home folders

[Fabian Maurer]

From: Fabian Maurer

---
 dlls/shell32/shellpath.c | 44 +++++++++++++++++++++++++++++++++-------
 1 file changed, 37 insertions(+), 7 deletions(-)

diff --git a/dlls/shell32/shellpath.c b/dlls/shell32/shellpath.c
index 5dd9f4b6310..06358de203f 100644
--- a/dlls/shell32/shellpath.c
+++ b/dlls/shell32/shellpath.c
@@ -2778,6 +2778,26 @@ done:
     CloseHandle( mgr );
 }

+static BOOL isolate_folder(const char *folder)
+{
+    char buffer[200];
+    char *current, *next;
+    const char *isolate = getenv("WINEISOLATE");
+
+    if (!isolate || strlen(isolate) > ARRAY_SIZE(buffer))
+        return FALSE;
+
+    strcpy(buffer, isolate);
+    current = strtok_s(buffer, ",", &next);
+    while (current)
+    {
+        if (!strcmp(current, folder))
+            return TRUE;
+        current = strtok(NULL, ",");
+    }
+    return FALSE;
+}
+
 /******************************************************************************
  * _SHCreateSymbolicLink  [Internal]
  *
@@ -2789,29 +2809,39 @@ done:
  */
 static void _SHCreateSymbolicLink(int nFolder, const WCHAR *path)
 {
+    BOOL isolate_all = isolate_folder("home");
     DWORD folder = nFolder & CSIDL_FOLDER_MASK;

+    if (isolate_all) return;
+
     switch (folder) {
         case CSIDL_PERSONAL:
-            create_link( path, "XDG_DOCUMENTS_DIR", "$HOME/Documents" );
+            if (!isolate_folder("documents"))
+                create_link( path, "XDG_DOCUMENTS_DIR", "$HOME/Documents" );
             break;
         case CSIDL_DESKTOPDIRECTORY:
-            create_link( path, "XDG_DESKTOP_DIR", "$HOME/Desktop" );
+            if (!isolate_folder("desktop"))
+                create_link( path, "XDG_DESKTOP_DIR", "$HOME/Desktop" );
             break;
         case CSIDL_MYPICTURES:
-            create_link( path, "XDG_PICTURES_DIR", "$HOME/Pictures" );
+            if (!isolate_folder("pictures"))
+                create_link( path, "XDG_PICTURES_DIR", "$HOME/Pictures" );
             break;
         case CSIDL_MYVIDEO:
-            create_link( path, "XDG_VIDEOS_DIR", "$HOME/Movies" );
+            if (!isolate_folder("movies"))
+                create_link( path, "XDG_VIDEOS_DIR", "$HOME/Movies" );
             break;
         case CSIDL_MYMUSIC:
-            create_link( path, "XDG_MUSIC_DIR", "$HOME/Music" );
+            if (!isolate_folder("music"))
+                create_link( path, "XDG_MUSIC_DIR", "$HOME/Music" );
             break;
         case CSIDL_DOWNLOADS:
-            create_link( path, "XDG_DOWNLOAD_DIR", "$HOME/Downloads" );
+            if (!isolate_folder("downloads"))
+                create_link( path, "XDG_DOWNLOAD_DIR", "$HOME/Downloads" );
             break;
         case CSIDL_TEMPLATES:
-            create_link( path, "XDG_TEMPLATES_DIR", "$HOME/Templates" );
+            if (!isolate_folder("templates"))
+                create_link( path, "XDG_TEMPLATES_DIR", "$HOME/Templates" );
             break;
     }
 }

[PATCH 2/2] ntdll: Add environment variable to prevent symlinking dosdevices/z:

[Fabian Maurer]

From: Fabian Maurer

---
 dlls/ntdll/unix/server.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/unix/server.c b/dlls/ntdll/unix/server.c
index e5e234d05ae..b84f53806c3 100644
--- a/dlls/ntdll/unix/server.c
+++ b/dlls/ntdll/unix/server.c
@@ -1269,6 +1269,26 @@ static const char *init_server_dir( dev_t dev, ino_t ino )
     return dir;
 }

+/* Copied from shell32/shellpath, changed to use strtok */
+static BOOL isolate_folder(const char *folder)
+{
+    char buffer[200];
+    char *current;
+    const char *isolate = getenv("WINEISOLATE");
+
+    if (!isolate || strlen(isolate) > ARRAY_SIZE(buffer))
+        return FALSE;
+
+    strcpy(buffer, isolate);
+    current = strtok(buffer, ",");
+    while (current)
+    {
+        if (!strcmp(current, folder))
+            return TRUE;
+        current = strtok(NULL, ",");
+    }
+    return FALSE;
+}

/***********************************************************************
  *           setup_config_dir
@@ -1307,7 +1327,8 @@ static int setup_config_dir(void)
     {
         mkdir( "drive_c", 0777 );
         symlink( "../drive_c", "dosdevices/c:" );
-        symlink( "/", "dosdevices/z:" );
+        if (!isolate_folder("root"))
+            symlink( "/", "dosdevices/z:" );
     }
     else if (errno != EEXIST) fatal_perror( "cannot create %s/dosdevices", config_dir );

[Fabian Maurer (＠DarkShadow44)]

Note that the ntdll change uses strtok which is not threadsafe - I hope this is not an issue. I would have used strtok_s, but it's not available there.

[Alex Henrie (＠alexhenrie)]

On Mon Jul 10 16:57:51 2023 +0000, Fabian Maurer wrote:
> Note that the ntdll change uses strtok which is not threadsafe - I hope
> this is not an issue. I would have used strtok_s, but it's not available there.

If thread safety matters here, could you use strtok_r?