Merge 8532688bab into 1298e9c398

When the flag is set, the `RUNSC_DEBUG=1` environment variable is added
to the outer container, and stderr is captured in a separate thread, before printing its output.

dangerzone/isolation_provider/base.py

@@ -20,6 +20,9 @@ from ..util import get_tessdata_dir, replace_control_chars
 
 log = logging.getLogger(__name__)
 
+DOC_TO_PIXELS_LOG_START = "----- DOC TO PIXELS LOG START -----"
+DOC_TO_PIXELS_LOG_END = "----- DOC TO PIXELS LOG END -----"
+
 TIMEOUT_EXCEPTION = 15
 TIMEOUT_GRACE = 15
 TIMEOUT_FORCE = 5
@@ -356,13 +359,14 @@ class IsolationProvider(ABC):
                 debug_bytes = stderr.getvalue()
                 debug_log = sanitize_debug_text(debug_bytes)
 
-                incomplete = "(incomplete) " if stderr_thread.is_alive() else ""
+                incomplete = "(incomplete)\n" if stderr_thread.is_alive() else ""
 
                 log.info(
                     "Conversion output (doc to pixels)\n"
-                    f"----- DOC TO PIXELS LOG START {incomplete}-----\n"
+                    f"{DOC_TO_PIXELS_LOG_START}\n"
                     f"{debug_log}"  # no need for an extra newline here
-                    "----- DOC TO PIXELS LOG END -----"
+                    f"{incomplete}"
+                    f"{DOC_TO_PIXELS_LOG_END}"
                 )
 
     def start_stderr_thread(