refactor: concentrate playback transition ownership

Checks/automatic-quality.py

@@ -42,11 +42,30 @@ def main():
         metadata = root / "info.json"
         metadata.write_text(json.dumps(info))
         wrapper = root / "yt-dlp"
-        wrapper.write_text("#!/bin/bash\nset -eu\nargs=(\"$@\")\nexec " + shlex.quote(extractor)
+        control = root / "control"
+        control.mkdir()
+        wrapper.write_text("#!/bin/bash\nset -eu\nargs=(\"$@\")\n"
+                           + "control=" + shlex.quote(str(control)) + "\n"
+                           + 'if [[ "$*" == *"[height=1080]"* ]]; then\n'
+                           + '  if [[ -f "$control/fail-1080" ]]; then\n'
+                           + '    echo "Fixture extraction deliberately failed" >&2; exit 1\n'
+                           + '  fi\n'
+                           + '  if [[ -f "$control/gate-1080" ]]; then\n'
+                           + "    " + shlex.quote(extractor) + " --load-info-json " + shlex.quote(str(metadata))
+                           + ' "${args[@]:0:${#args[@]}-2}" > "$control/output-1080.json"\n'
+                           + '    trap \': > "$control/finished-1080"; exit 0\' TERM\n'
+                           + '    : > "$control/entered-1080"\n'
+                           + '    while [[ ! -f "$control/release-1080" ]]; do sleep 0.01; done\n'
+                           + '    cat "$control/output-1080.json" || true\n'
+                           + '    : > "$control/finished-1080"\n'
+                           + '    exit 0\n'
+                           + '  fi\n'
+                           + 'fi\nexec ' + shlex.quote(extractor)
                            + " --load-info-json " + shlex.quote(str(metadata))
                            + ' "${args[@]:0:${#args[@]}-2}"\n')
         wrapper.chmod(0o755)
-        environment = dict(os.environ, PATH=str(root) + os.pathsep + os.environ.get("PATH", ""))
+        environment = dict(os.environ, PATH=str(root) + os.pathsep + os.environ.get("PATH", ""),
+                           TEREBI_QUALITY_CONTROL=str(control))
         try:
             result = subprocess.run([str(args.binary.resolve())], env=environment, timeout=90, check=False)
         except subprocess.TimeoutExpired: