[PATCH 4/4] dts: log stderr with failed remote commands

[Luca Vizzarro <luca.vizzarro@arm.com>]

Add the executed command stderr to RemoteCommandExecutionError. So that
it is logged as an error, instead of just as debug.

Reviewed-by: Paul Szczepanek <paul.szczepanek@arm.com>
Signed-off-by: Luca Vizzarro <luca.vizzarro@arm.com>
---
 dts/framework/exception.py                     | 10 +++++++---
 dts/framework/remote_session/remote_session.py |  2 +-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/dts/framework/exception.py b/dts/framework/exception.py
index 658eee2c38..9fc3fa096a 100644
--- a/dts/framework/exception.py
+++ b/dts/framework/exception.py
@@ -130,20 +130,24 @@ class RemoteCommandExecutionError(DTSError):
     #: The executed command.
     command: str
     _command_return_code: int
+    _command_stderr: str
 
-    def __init__(self, command: str, command_return_code: int):
+    def __init__(self, command: str, command_return_code: int, command_stderr: str):
         """Define the meaning of the first two arguments.
 
         Args:
             command: The executed command.
             command_return_code: The return code of the executed command.
+            command_stderr: The stderr of the executed command.
         """
         self.command = command
         self._command_return_code = command_return_code
+        self._command_stderr = command_stderr
 
     def __str__(self) -> str:
-        """Include both the command and return code in the string representation."""
-        return f"Command {self.command} returned a non-zero exit code: {self._command_return_code}"
+        """Include the command, its return code and stderr in the string representation."""
+        return (f"Command '{self.command}' returned a non-zero exit code: "
+                f"{self._command_return_code}\n{self._command_stderr}")
 
 
 class RemoteDirectoryExistsError(DTSError):
diff --git a/dts/framework/remote_session/remote_session.py b/dts/framework/remote_session/remote_session.py
index 2059f9a981..345439f2de 100644
--- a/dts/framework/remote_session/remote_session.py
+++ b/dts/framework/remote_session/remote_session.py
@@ -157,7 +157,7 @@ def send_command(
             )
             self._logger.debug(f"stdout: '{result.stdout}'")
             self._logger.debug(f"stderr: '{result.stderr}'")
-            raise RemoteCommandExecutionError(command, result.return_code)
+            raise RemoteCommandExecutionError(command, result.return_code, result.stderr)
         self._logger.debug(f"Received from '{command}':\n{result}")
         self.history.append(result)
         return result
-- 
2.34.1