From 8b28a268e8f9095633cc8e3a63d73dfdfbf124d6 Mon Sep 17 00:00:00 2001
From: Frederik Schubert <github@frederik-schubert.de>
Date: Fri, 9 Oct 2020 23:05:18 +0200
Subject: [PATCH] remote: set dependency name for WebDAV (#4691)

When executing `dvc import-url remote://some-webdav/data`, the name of
the WebDAV dependency in the created stage for data used to be `None`.
This resulted in the following error:
```
Traceback (most recent call last):
  File "/home/schubert/projects/dvc/dvc/main.py", line 76, in main
    ret = cmd.run()
  File "/home/schubert/projects/dvc/dvc/command/imp_url.py", line 14, in run
    self.repo.imp_url(
  File "/home/schubert/projects/dvc/dvc/repo/__init__.py", line 51, in wrapper
    return f(repo, *args, **kwargs)
  File "/home/schubert/projects/dvc/dvc/repo/scm_context.py", line 4, in run
    result = method(repo, *args, **kw)
  File "/home/schubert/projects/dvc/dvc/repo/imp_url.py", line 54, in imp_url
    stage.run()
  File "/home/schubert/miniconda3/tmp/envs/some-project/lib/python3.8/site-packages/funcy/decorators.py", line 39, in wrapper
    return deco(call, *dargs, **dkwargs)
  File "/home/schubert/projects/dvc/dvc/stage/decorators.py", line 36, in rwlocked
    return call()
  File "/home/schubert/miniconda3/tmp/envs/some-project/lib/python3.8/site-packages/funcy/decorators.py", line 60, in __call__
    return self._func(*self._args, **self._kwargs)
  File "/home/schubert/projects/dvc/dvc/stage/__init__.py", line 450, in run
    self.save()
  File "/home/schubert/projects/dvc/dvc/stage/__init__.py", line 395, in save
    self.md5 = self.compute_md5()
  File "/home/schubert/projects/dvc/dvc/stage/__init__.py", line 388, in compute_md5
    m = compute_md5(self)
  File "/home/schubert/projects/dvc/dvc/stage/utils.py", line 167, in compute_md5
    return dict_md5(
  File "/home/schubert/projects/dvc/dvc/utils/__init__.py", line 118, in dict_md5
    return dict_hash(d, "md5", **kwargs)
  File "/home/schubert/projects/dvc/dvc/utils/__init__.py", line 113, in dict_hash
    byts = json.dumps(filtered, sort_keys=True).encode("utf-8")
  File "/home/schubert/miniconda3/tmp/envs/some-project/lib/python3.8/json/__init__.py", line 234, in dumps
    return cls(
  File "/home/schubert/miniconda3/tmp/envs/some-project/lib/python3.8/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/home/schubert/miniconda3/tmp/envs/some-project/lib/python3.8/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
TypeError: '<' not supported between instances of 'str' and 'NoneType'
```
---
 dvc/tree/webdav.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dvc/tree/webdav.py b/dvc/tree/webdav.py
index 9bb270517..8f7402674 100644
--- a/dvc/tree/webdav.py
+++ b/dvc/tree/webdav.py
@@ -42,6 +42,8 @@ class WebDAVTree(BaseTree):  # pylint:disable=abstract-method
     # Chunk size for buffered upload/download with progress bar
     CHUNK_SIZE = 2 ** 16
 
+    PARAM_CHECKSUM = "etag"
+
     # Constructor
     def __init__(self, repo, config):
         # Call BaseTree constructor