File copy fix for non-Unix platforms

scripts/lua/modules/file_utils.lua

@@ -0,0 +1,80 @@
+--
+-- (C) 2019 - ntop.org
+--
+
+local file_utils = {}
+local os_utils = require("os_utils")
+
+-- ##############################################
+
+function file_utils.copy_file(fname, src_path, dst_path)
+   local src
+   local dst
+
+   if(fname == nil) then
+      src = src_path
+      dst = dst_path
+   else
+      src = os_utils.fixPath(src_path .. "/" .. fname)
+      dst = os_utils.fixPath(dst_path .. "/" .. fname)
+   end
+
+   local infile, err = io.open(src, "rb")
+
+   -- NOTE: Do not forget the 'b' flag [https://www.lua.org/pil/21.2.2.html]
+   --       as this is compulsory on windows
+
+   traceError(TRACE_INFO, TRACE_CONSOLE, string.format("Copying file %s -> %s", src, dst))
+
+   if(do_trace) then
+      io.write(string.format("\tLoad [%s]\n", fname))
+   end
+
+   if(ntop.exists(dst)) then
+      -- NOTE: overwriting is not allowed as it means that a file was already provided by
+      -- another plugin
+      traceError(TRACE_ERROR, TRACE_CONSOLE, string.format("Trying to overwrite existing file %s", dst))
+      return(false)
+   end
+
+   if(infile == nil) then
+      traceError(TRACE_ERROR, TRACE_CONSOLE, string.format("Could not open file %s for read: %s", src, err or ""))
+      return(false)
+   end
+
+   local instr = infile:read("*all")
+   infile:close()
+
+   local outfile, err = io.open(dst, "wb")
+   if(outfile == nil) then
+      traceError(TRACE_ERROR, TRACE_CONSOLE, string.format("Could not open file %s for write", dst, err or ""))
+      return(false)
+   end
+
+   outfile:write(instr)
+   outfile:close()
+
+   ntop.setDefaultFilePermissions(dst)
+
+   return(true)
+end
+
+-- #########################################################
+
+function file_utils.recursive_copy(src_path, dst_path, path_map)
+   for fname in pairs(ntop.readdir(src_path)) do
+      if not file_utils.copy_file(fname, src_path, dst_path) then
+	 return(false)
+      end
+
+      if path_map then
+	 path_map[os_utils.fixPath(dst_path .. "/" .. fname)] = os_utils.fixPath(src_path .. "/" .. fname)
+      end
+   end
+
+   return(true)
+end
+
+-- #########################################################
+
+return(file_utils)