Fix handling of error output

jupyter_releaser/lib.py

@@ -384,7 +384,7 @@ def publish_assets(dist_dir, npm_token, npm_cmd, twine_cmd, dry_run, use_checkou
             try:
                 util.run(f"{npm_cmd} {name}", cwd=dist_dir, quiet=True)
             except CalledProcessError as e:
-                stderr = e.stderr.decode("utf-8")
+                stderr = e.stderr
                 if (
                     "EPUBLISHCONFLICT" in stderr
                     or "previously published versions" in stderr

jupyter_releaser/tests/test_cli.py

@@ -530,7 +530,7 @@ def wrapped(cmd, **kwargs):
             called += 1
             if called == 0:
                 err = CalledProcessError(1, "foo")
-                err.stderr = "EPUBLISHCONFLICT".encode("UTF-8")
+                err.stderr = "EPUBLISHCONFLICT"
                 raise err
 
     mock_run = mocker.patch("jupyter_releaser.util.run", wraps=wrapped)
@@ -559,7 +559,7 @@ def wrapped(cmd, **kwargs):
         if cmd.startswith("npm publish --dry-run"):
             called += 1
             err = CalledProcessError(1, "foo")
-            err.stderr = "previously published versions".encode("UTF-8")
+            err.stderr = "previously published versions"
             raise err
 
     mocker.patch("jupyter_releaser.util.run", wraps=wrapped)

jupyter_releaser/util.py

@@ -82,9 +82,11 @@ def _run_win(cmd, **kwargs):
         log(output)
         return output
     except CalledProcessError as e:
+        e.output = e.output.decode("utf-8")
         if quiet:
-            log("stderr:\n", e.stderr.decode("utf-8").strip(), "\n\n")
-        log("stdout:\n", e.output.decode("utf-8").strip(), "\n\n")
+            e.stderr = e.stderr.decode("utf-8")
+            log("stderr:\n", e.stderr.strip(), "\n\n")
+        log("stdout:\n", e.output.strip(), "\n\n")
         raise e