Writefile: only include recovery info in auto-save & quit.blend

Previously all blend files included the path they were saved,
causing files distributed publicly to include users local paths.
This also included developers home directories for startup & userprefs
defaults & app-templates bundled with Blender.

Now recovery information is only written for auto-save & quit.blend
since this is the only time they're intended to be used.

source/blender/blenkernel/BKE_global.h

@@ -179,6 +179,14 @@ enum {
    * so keep this as a flag.
    */
   G_FILE_RECOVER_READ = (1 << 23),
+  /**
+   * On write, assign use #FileGlobal.filename, otherwise leave it blank,
+   * needed so files can be recovered at their original locations.
+   *
+   * \note only #BLENDER_QUIT_FILE and auto-save files include recovery information.
+   * As users/developers may not want their paths exposed in publicly distributed files.
+   */
+  G_FILE_RECOVER_WRITE = (1 << 24),
   /** BMesh option to save as older mesh format */
   /* #define G_FILE_MESH_COMPAT       (1 << 26) */
   /* #define G_FILE_GLSL_NO_ENV_LIGHTING (1 << 28) */ /* deprecated */
@@ -188,7 +196,7 @@ enum {
  * Run-time only #G.fileflags which are never read or written to/from Blend files.
  * This means we can change the values without worrying about do-versions.
  */
-#define G_FILE_FLAG_ALL_RUNTIME (G_FILE_NO_UI)
+#define G_FILE_FLAG_ALL_RUNTIME (G_FILE_NO_UI | G_FILE_RECOVER_READ | G_FILE_RECOVER_WRITE)
 
 /** ENDIAN_ORDER: indicates what endianness the platform where the file was written had. */
 #if !defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)

source/blender/blenkernel/intern/blender_undo.c

@@ -115,6 +115,9 @@ MemFileUndoData *BKE_memfile_undo_encode(Main *bmain, MemFileUndoData *mfu_prev)
 {
   MemFileUndoData *mfu = MEM_callocN(sizeof(MemFileUndoData), __func__);
 
+  /* Include recovery infomation since undo-data is written out as #BLENDER_QUIT_FILE. */
+  const int fileflags = G.fileflags | G_FILE_RECOVER_WRITE;
+
   /* disk save version */
   if (UNDO_DISK) {
     static int counter = 0;
@@ -129,7 +132,7 @@ MemFileUndoData *BKE_memfile_undo_encode(Main *bmain, MemFileUndoData *mfu_prev)
     BLI_join_dirfile(filename, sizeof(filename), BKE_tempdir_session(), numstr);
 
     /* success = */ /* UNUSED */ BLO_write_file(
-        bmain, filename, G.fileflags, &(const struct BlendFileWriteParams){0}, NULL);
+        bmain, filename, fileflags, &(const struct BlendFileWriteParams){0}, NULL);
 
     BLI_strncpy(mfu->filename, filename, sizeof(mfu->filename));
   }
@@ -138,7 +141,7 @@ MemFileUndoData *BKE_memfile_undo_encode(Main *bmain, MemFileUndoData *mfu_prev)
     if (prevfile) {
       BLO_memfile_clear_future(prevfile);
     }
-    /* success = */ /* UNUSED */ BLO_write_file_mem(bmain, prevfile, &mfu->memfile, G.fileflags);
+    /* success = */ /* UNUSED */ BLO_write_file_mem(bmain, prevfile, &mfu->memfile, fileflags);
     mfu->undo_size = mfu->memfile.size;
   }
 

source/blender/blenloader/intern/writefile.c

@@ -870,7 +870,10 @@ static void write_global(WriteData *wd, int fileflags, Main *mainvar)
   fg.fileflags = (fileflags & ~G_FILE_FLAG_ALL_RUNTIME);
 
   fg.globalf = G.f;
-  BLI_strncpy(fg.filename, mainvar->name, sizeof(fg.filename));
+  /* Write information needed for recovery. */
+  if (fileflags & G_FILE_RECOVER_WRITE) {
+    BLI_strncpy(fg.filename, mainvar->name, sizeof(fg.filename));
+  }
   sprintf(subvstr, "%4d", BLENDER_FILE_SUBVERSION);
   memcpy(fg.subvstr, subvstr, 4);
 

source/blender/windowmanager/intern/wm_files.c

@@ -1682,8 +1682,8 @@ void wm_autosave_timer(Main *bmain, wmWindowManager *wm, wmTimer *UNUSED(wt))
     }
   }
   else {
-    /* Save as regular blend file. */
+    /* Save as regular blend file with recovery information. */
-    const int fileflags = G.fileflags & ~G_FILE_COMPRESS;
+    const int fileflags = (G.fileflags & ~G_FILE_COMPRESS) | G_FILE_RECOVER_WRITE;
 
     ED_editors_flush_edits(bmain);