I had been using an old galaxy build, downloaded in 2010, on my local server and now I am updating it to latest build. I had made some changes as per our need. Along with the output file I have added a piece of code which was making us able to download the stderr file as well in case. I had made those changes inside the display function of lib/galaxy/webapps/galaxy/controllers/dataset.py file. But galaxy have gone through significant changes. Now the display function of lib/galaxy/webapps/galaxy/controllers/dataset.py calls display_data function.

def display(self, trans, dataset_id=None, preview=False, filename=None, to_ext=None, chunk=None, **kwd):

...

return data.datatype.display_data(trans, data, preview, filename, to_ext, chunk, **kwd)

display_data function is present in lib/galaxy/datatypes/data.py as well as in lib/galaxy/datatypes/tabular.py

The code which I had changed in previous galaxy is present in ..../data.py but the display function is calling the display_data function of .../tabular.py always. How will I make it able to call display_data function of ..../data.py 

Please tell me the solution of the above problem or is there any better way to download some more file like stdout, stderr apart from the regular output file. Any help would be really appreciated.

P.S. I am creating stderr and stdout file inside database/user_directory

Thanks

Himanshu