ls-url: chain exceptions and simplify exc handling

dvc/commands/ls_url.py

@@ -3,7 +3,6 @@ import logging
 
 from dvc.cli.command import CmdBaseNoRepo
 from dvc.cli.utils import append_doc_link
-from dvc.exceptions import DvcException
 from dvc.ui import ui
 
 from .ls import _prettify
@@ -15,15 +14,11 @@ class CmdListUrl(CmdBaseNoRepo):
     def run(self):
         from dvc.repo import Repo
 
-        try:
         entries = Repo.ls_url(self.args.url, recursive=self.args.recursive)
         if entries:
             entries = _prettify(entries, with_color=True)
             ui.write("\n".join(entries))
         return 0
-        except DvcException:
-            logger.exception("failed to list '%s'", self.args.url)
-            return 1
 
 
 def add_parser(subparsers, parent_parser):

dvc/exceptions.py

@@ -280,7 +280,7 @@ class PathMissingError(DvcException):
 
 class URLMissingError(DvcException):
     def __init__(self, url):
-        super().__init__(f"The path '{url}' does not exist.")
+        super().__init__(f"The path '{url}' does not exist")
 
 
 class RemoteCacheRequiredError(DvcException):

dvc/repo/ls_url.py

@@ -12,8 +12,8 @@ def ls_url(url, recursive=False):
     fs, fs_path = parse_external_url(url)
     try:
         info = fs.info(fs_path)
-    except FileNotFoundError:
-        raise URLMissingError(url)
+    except FileNotFoundError as exc:
+        raise URLMissingError(url) from exc
     if info["type"] != "directory":
         return [{"path": info["name"], "isdir": False}]