version: add supported remotes (#3498)

Since our remotes have optional dependencies, it is really useful to be
able to see what is currently supported. Also helps debug issues with
packages such as brew/conda/etc.

dvc/command/version.py

@@ -31,6 +31,7 @@ class CmdVersion(CmdBaseNoRepo):
             "Platform: {}".format(platform.platform()),
             "Binary: {}".format(is_binary()),
             "Package: {}".format(PKG),
+            "Supported remotes: {}".format(self.get_supported_remotes()),
         ]
 
         try:
@@ -112,6 +113,17 @@ class CmdVersion(CmdBaseNoRepo):
 
         return ", ".join(cache)
 
+    @staticmethod
+    def get_supported_remotes():
+        from dvc.remote import REMOTES
+
+        supported_remotes = []
+        for remote in REMOTES:
+            if not remote.get_missing_deps():
+                supported_remotes.append(remote.scheme)
+
+        return ", ".join(supported_remotes)
+
 
 def add_parser(subparsers, parent_parser):
     VERSION_HELP = "Show DVC version and system/environment information."

dvc/remote/base.py

@@ -108,17 +108,21 @@ class RemoteBASE(object):
         self.cache_types = config.get("type") or copy(self.DEFAULT_CACHE_TYPES)
         self.cache_type_confirmed = False
 
-    def _check_requires(self, config):
+    @classmethod
+    def get_missing_deps(cls):
         import importlib
 
         missing = []
-
-        for package, module in self.REQUIRES.items():
+        for package, module in cls.REQUIRES.items():
             try:
                 importlib.import_module(module)
             except ImportError:
                 missing.append(package)
 
+        return missing
+
+    def _check_requires(self, config):
+        missing = self.get_missing_deps()
         if not missing:
             return
 

tests/func/test_version.py

@@ -17,6 +17,7 @@ def test_info_in_repo(tmp_dir, dvc, caplog):
     assert re.search(r"Platform: .*", caplog.text)
     assert re.search(r"Binary: (True|False)", caplog.text)
     assert re.search(r"Package: .*", caplog.text)
+    assert re.search(r"Supported remotes: .*", caplog.text)
     assert re.search(
         r"(Cache: (.*link - (not )?supported(,\s)?){3})", caplog.text
     )
@@ -39,6 +40,7 @@ def test_info_outside_of_repo(tmp_dir, caplog):
     assert re.search(r"Platform: .*", caplog.text)
     assert re.search(r"Binary: (True|False)", caplog.text)
     assert re.search(r"Package: .*", caplog.text)
+    assert re.search(r"Supported remotes: .*", caplog.text)
     assert not re.search(r"(Cache: (.*link - (not )?(,\s)?){3})", caplog.text)