Add info for link type and filesystem name (#1997)

* Add info for link and filesystem type

* Remove unnecessary `repo_dir` fixture

* Add cache info

* Classify `test_version.py` as functional test

* Remove redundancy

* Optimize some functions involved

* Add pathlib2 to install_requires

* Display fs type for cache directory

* Use `dvc.utils.compat` to import Path

* Remove redundancy in tests and make logs more descriptive

dvc/command/version.py

@@ -1,11 +1,18 @@
 from __future__ import unicode_literals
 
+import os
+import psutil
 import platform
 import argparse
 import logging
+import uuid
 
+from dvc.utils.compat import Path
+from dvc.repo import Repo
 from dvc.command.base import CmdBaseNoRepo, append_doc_link
 from dvc.version import __version__
+from dvc.exceptions import DvcException, NotDvcRepoError
+from dvc.system import System
 
 
 logger = logging.getLogger(__name__)
@@ -13,18 +20,83 @@ logger = logging.getLogger(__name__)
 
 class CmdVersion(CmdBaseNoRepo):
     def run(self):
+        dvc_version = __version__
+        python_version = platform.python_version()
+        platform_type = platform.platform()
+
         info = (
             "DVC version: {dvc_version}\n"
             "Python version: {python_version}\n"
-            "Platform: {platform_type}"
+            "Platform: {platform_type}\n"
         ).format(
-            dvc_version=__version__,
-            python_version=platform.python_version(),
-            platform_type=platform.platform(),
+            dvc_version=dvc_version,
+            python_version=python_version,
+            platform_type=platform_type,
+        )
+
+        try:
+            repo = Repo()
+            root_directory = repo.root_dir
+
+            info += (
+                "Cache: {cache}\n"
+                "Filesystem type (cache directory): {fs_cache}\n"
+            ).format(
+                cache=self.get_linktype_support_info(repo),
+                fs_cache=self.get_fs_type(repo.cache.local.cache_dir),
+            )
+
+        except NotDvcRepoError:
+            root_directory = os.getcwd()
+
+        info += ("Filesystem type (workspace): {fs_root}").format(
+            fs_root=self.get_fs_type(os.path.abspath(root_directory))
         )
         logger.info(info)
         return 0
 
+    @staticmethod
+    def get_fs_type(path):
+        partition = {
+            Path(part.mountpoint): (part.fstype, part.device)
+            for part in psutil.disk_partitions()
+        }
+        for parent in list(Path(path).parents):
+            if parent in partition:
+                return partition[parent]
+        return ("unkown", "none")
+
+    @staticmethod
+    def get_linktype_support_info(repo):
+        links = {
+            "reflink": System.reflink,
+            "hardlink": System.hardlink,
+            "symlink": System.symlink,
+        }
+
+        fname = "." + str(uuid.uuid4())
+        src = os.path.join(repo.cache.local.cache_dir, fname)
+        open(src, "w").close()
+        dst = os.path.join(repo.root_dir, fname)
+
+        cache = []
+
+        for name, link in links.items():
+            try:
+                link(src, dst)
+                os.unlink(dst)
+                supported = True
+            except DvcException:
+                supported = False
+            cache.append(
+                "{name} - {supported}".format(
+                    name=name, supported=True if supported else False
+                )
+            )
+        os.remove(src)
+
+        return ", ".join(cache)
+
 
 def add_parser(subparsers, parent_parser):
     VERSION_HELP = "Show DVC version and system/environment informaion."

setup.py

@@ -60,6 +60,7 @@ install_requires = [
     "humanize>=0.5.1",
     "dulwich>=0.19.11",
     "ruamel.yaml>=0.15.91",
+    "psutil==5.6.2",
 ]
 
 # Extra dependencies for remote integrations

tests/func/test_version.py

@@ -0,0 +1,37 @@
+import re
+
+from dvc.main import main
+
+
+def test_info_in_repo(dvc_repo, caplog):
+    assert main(["version"]) == 0
+
+    assert re.search(re.compile(r"DVC version: \d+\.\d+\.\d+"), caplog.text)
+    assert re.search(re.compile(r"Python version: \d\.\d\.\d"), caplog.text)
+    assert re.search(re.compile(r"Platform: .*"), caplog.text)
+    assert re.search(
+        re.compile(r"Filesystem type \(cache directory\): .*"), caplog.text
+    )
+    assert re.search(
+        re.compile(r"Filesystem type \(workspace\): .*"), caplog.text
+    )
+    assert re.search(
+        re.compile(r"(Cache: (.*link - (True|False)(,\s)?){3})"), caplog.text
+    )
+
+
+def test_info_outside_of_repo(repo_dir, caplog):
+    assert main(["version"]) == 0
+
+    assert re.search(re.compile(r"DVC version: \d+\.\d+\.\d+"), caplog.text)
+    assert re.search(re.compile(r"Python version: \d\.\d\.\d"), caplog.text)
+    assert re.search(re.compile(r"Platform: .*"), caplog.text)
+    assert re.search(
+        re.compile(r"Filesystem type \(workspace\): .*"), caplog.text
+    )
+    assert not re.search(
+        re.compile(r"Filesystem type \(cache directory\): .*"), caplog.text
+    )
+    assert not re.search(
+        re.compile(r"(Cache: (.*link - (True|False)(,\s)?){3})"), caplog.text
+    )

tests/unit/command/test_version.py

@@ -1,25 +0,0 @@
-import re
-
-from dvc.command.version import CmdVersion
-from dvc.cli import parse_args
-
-
-def test_run_in_repo(repo_dir, dvc_repo):
-    cmd = CmdVersion(parse_args(["version"]))
-    ret = cmd.run_cmd()
-    assert ret == 0
-
-
-def test_run_outside_of_repo(repo_dir):
-    cmd = CmdVersion(parse_args(["version"]))
-    ret = cmd.run_cmd()
-    assert ret == 0
-
-
-def test_info(caplog):
-    cmd = CmdVersion(parse_args(["version"]))
-    cmd.run()
-
-    assert re.search(re.compile(r"DVC version: \d+\.\d+\.\d+"), caplog.text)
-    assert re.search(re.compile(r"Python version: \d\.\d\.\d"), caplog.text)
-    assert re.search(re.compile(r"Platform: .*"), caplog.text)