fixed plug-ins directory initialization for extremely restricted guest users with no directory listing access to the temporary directory

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@3909 212acab6-be3b-0410-9dea-997c60f758d6

Source/build.cpp

@@ -3216,8 +3216,8 @@ again:
   // GetTempFileName $0
   ret=add_entry_direct(EW_GETTEMPFILENAME, var_zero, add_string("$TEMP"));
   if (ret != PS_OK) return ret;
-  // Delete $0 - the temp file created
-  ret=add_entry_direct(EW_DELETEFILE, zero_offset);
+  // Delete $0 [simple, nothing that could clash with special temp permissions]
+  ret=add_entry_direct(EW_DELETEFILE, zero_offset, DEL_SIMPLE);
   if (ret != PS_OK) return ret;
   // CraeteDirectory $0 - a dir instead of that temp file
   ret=add_entry_direct(EW_CREATEDIR, zero_offset);

Source/exehead/fileform.h

@@ -442,6 +442,7 @@ typedef struct {
 #define DEL_DIR 1
 #define DEL_RECURSE 2
 #define DEL_REBOOT 4
+#define DEL_SIMPLE 8
 
 // $0..$9, $INSTDIR, etc are encoded as ASCII bytes starting from this value.
 // Added by ramon 3 jun 2003

Source/exehead/util.c

@@ -103,6 +103,12 @@ void NSISCALL myDelete(char *buf, int flags)
   char *fn;
   int valid_dir=is_valid_instpath(buf);
 
+  if ((flags & DEL_SIMPLE))
+  {
+    g_exec_flags.exec_error += !DeleteFile(buf);
+    return;
+  }
+
 #ifdef NSIS_SUPPORT_RMDIR
   if (!(flags & DEL_DIR) || (valid_dir && (flags & DEL_RECURSE)))
 #endif//NSIS_SUPPORT_RMDIR