id,node_id,number,title,user,user_label,state,locked,assignee,assignee_label,milestone,milestone_label,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,repo_label,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
608058890,MDU6SXNzdWU2MDgwNTg4OTA=,744,link_or_copy_directory() error - Invalid cross-device link,30607,aborruso,closed,0,,,,,28,2020-04-28T06:26:45Z,2020-05-28T14:32:53Z,2020-05-27T06:01:28Z,NONE,,"Hi,
when I run

```
datasette  publish heroku -n myapp --template-dir ./template mydb.db
```

I have this error

```
Traceback (most recent call last):
  File ""/home/aborruso/.local/lib/python3.7/site-packages/datasette/utils/__init__.py"", line 607, in link_or_copy_directory
    shutil.copytree(src, dst, copy_function=os.link)
  File ""/usr/lib/python3.7/shutil.py"", line 365, in copytree
    raise Error(errors)
shutil.Error: [('/myfolder/youtubeComunePalermo/processing/./template/base.html', '/tmp/tmps9_4mzc4/templates/base.html', ""[Errno 18] Invalid cross-device link: '/myfolder/youtubeComunePalermo/processing/./template/base.html' -> '/tmp/tmps9_4mzc4/templates/base.html'""), ('/myfolder/youtubeComunePalermo/processing/./template/index.html', '/tmp/tmps9_4mzc4/templates/index.html', ""[Errno 18] Invalid cross-device link: '/myfolder/youtubeComunePalermo/processing/./template/index.html' -> '/tmp/tmps9_4mzc4/templates/index.html'"")]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File ""/home/aborruso/.local/bin/datasette"", line 8, in <module>
    sys.exit(cli())
  File ""/home/aborruso/.local/lib/python3.7/site-packages/click/core.py"", line 829, in __call__
    return self.main(*args, **kwargs)
  File ""/home/aborruso/.local/lib/python3.7/site-packages/click/core.py"", line 782, in main
    rv = self.invoke(ctx)
  File ""/home/aborruso/.local/lib/python3.7/site-packages/click/core.py"", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File ""/home/aborruso/.local/lib/python3.7/site-packages/click/core.py"", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File ""/home/aborruso/.local/lib/python3.7/site-packages/click/core.py"", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File ""/home/aborruso/.local/lib/python3.7/site-packages/click/core.py"", line 610, in invoke
    return callback(*args, **kwargs)
  File ""/home/aborruso/.local/lib/python3.7/site-packages/datasette/publish/heroku.py"", line 103, in heroku
    extra_metadata,
  File ""/usr/lib/python3.7/contextlib.py"", line 112, in __enter__
    return next(self.gen)
  File ""/home/aborruso/.local/lib/python3.7/site-packages/datasette/publish/heroku.py"", line 191, in temporary_heroku_directory
    os.path.join(tmp.name, ""templates""),
  File ""/home/aborruso/.local/lib/python3.7/site-packages/datasette/utils/__init__.py"", line 609, in link_or_copy_directory
    shutil.copytree(src, dst)
  File ""/usr/lib/python3.7/shutil.py"", line 321, in copytree
    os.makedirs(dst)
  File ""/usr/lib/python3.7/os.py"", line 221, in makedirs
    mkdir(name, mode)
FileExistsError: [Errno 17] File exists: '/tmp/tmps9_4mzc4/templates'
```

I'm attaching my very basic template folder.

Thank you 

[template.zip](https://github.com/simonw/datasette/files/4543751/template.zip)
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