Enh: Show docker pull error messages

Author: klieret

src/swerex/deployment/docker.py

@@ -3,7 +3,6 @@
 import subprocess
 import time
 import uuid
-import time
 from typing import Any
 
 from typing_extensions import Self
@@ -139,18 +138,18 @@ def _pull_image(self) -> None:
         try:
             _pull_image(self._config.image)
         except subprocess.CalledProcessError as e:
-            msg = f"Failed to pull image {self._config.image}"
+            msg = f"Failed to pull image {self._config.image}. "
+            msg += f"Error: {e.stderr.decode()}"
+            msg += f"Output: {e.output.decode()}"
             raise DockerPullError(msg) from e
 
     @property
     def glibc_dockerfile(self) -> str:
         # will only work with glibc-based systems
         text = (
             "ARG BASE_IMAGE\n\n"
-            
             # Build stage for standalone Python
             "FROM python:3.11-slim AS builder\n"
-            
             # Install build dependencies
             "RUN apt-get update && apt-get install -y \\\n"
             "    wget \\\n"
@@ -159,7 +158,6 @@ def glibc_dockerfile(self) -> str:
             "    zlib1g-dev \\\n"
             "    libssl-dev \\\n"
             "    && rm -rf /var/lib/apt/lists/*\n\n"
-            
             # Download and compile Python as standalone
             "WORKDIR /build\n"
             "RUN wget https://www.python.org/ftp/python/3.11.8/Python-3.11.8.tgz \\\n"
@@ -168,35 +166,39 @@ def glibc_dockerfile(self) -> str:
             "RUN ./configure --prefix=/root/python3.11 --enable-shared \\\n"
             "    && make -j$(nproc) \\\n"
             "    && make install\n\n"
-            
             # Install swe-rex using the standalone Python
             f"RUN /root/python3.11/bin/pip3 install --no-cache-dir {PACKAGE_NAME}\n\n"
-
             # Production stage
             "FROM $BASE_IMAGE\n"
-            
             # Copy the standalone Python installation
             f"COPY --from=builder /root/python3.11 {self._config.python_standalone_dir}/python3.11\n"
-            
             # Append to LD_LIBRARY_PATH instead of overwriting it
             f"ENV LD_LIBRARY_PATH={self._config.python_standalone_dir}/python3.11/lib:${{LD_LIBRARY_PATH}}\n"
-            
             # Verify installation
             f"RUN {self._config.python_standalone_dir}/python3.11/bin/python3 --version\n"
             # Create symlink to make the executable available in PATH
             f"RUN {self._config.python_standalone_dir}/python3.11/bin/{REMOTE_EXECUTABLE_NAME} --version\n"
         )
         return text
-    
+
     def _build_image(self):
         dockerfile = self.glibc_dockerfile
         # build docker image without a tag, but get the image id
-        image_id = subprocess.check_output(
-            [
-                "docker", "build", "-q", "--build-arg", f"BASE_IMAGE={self._config.image}", "-",
-            ],
-            input=dockerfile.encode(),
-        ).decode().strip()
+        image_id = (
+            subprocess.check_output(
+                [
+                    "docker",
+                    "build",
+                    "-q",
+                    "--build-arg",
+                    f"BASE_IMAGE={self._config.image}",
+                    "-",
+                ],
+                input=dockerfile.encode(),
+            )
+            .decode()
+            .strip()
+        )
         return image_id
 
     async def start(self):