update env

Dockerfile

@@ -39,5 +39,28 @@ COPY --chown=user ./requirements.txt requirements.txt
 # `import vllm` at container start.
 RUN pip install --no-cache-dir --prefer-binary -r requirements.txt
 
+# Force-upgrade gradio specifically.
+#
+# The vllm/vllm-openai:v0.8.5 base image ships an old gradio (pre-4.4) that
+# is missing newer kwargs like `show_copy_button` on gr.Textbox. Listing
+# `gradio>=4.44` in requirements.txt is NOT enough: without --upgrade, pip
+# leaves any already-installed gradio in place as long as it parses as
+# >=4.44 (and even when it doesn't, the resolver sometimes keeps it for
+# compatibility reasons inside this image).
+#
+# We isolate this to a single line and use:
+#   --upgrade                       : actually replace the existing gradio
+#   --upgrade-strategy only-if-needed
+#                                   : do NOT cascade-upgrade gradio's deps
+#                                     (fastapi / pydantic / starlette /
+#                                      uvicorn) unless gradio strictly
+#                                     requires it -- those are tightly
+#                                     coupled to vllm's OpenAI server and
+#                                     bumping them can break `import vllm`.
+#   --prefer-binary                 : never trigger a source build.
+RUN pip install --no-cache-dir --prefer-binary \
+        --upgrade --upgrade-strategy only-if-needed \
+        "gradio>=4.44,<6"
+
 COPY --chown=user . /app
 CMD ["python3", "app.py"]

app.py

@@ -243,6 +243,11 @@ with gr.Blocks(title="SongPrep Demo Space") as demo:
                 label="Parsed Lyrics",
                 value="*(Results will appear here.)*",
             )
+            # `show_copy_button` was added in Gradio 4.4. The
+            # vllm/vllm-openai:v0.8.5 base image ships an older gradio,
+            # so the Dockerfile force-upgrades gradio to >=4.44 right
+            # after `pip install -r requirements.txt`. With that upgrade
+            # in place this kwarg is safe to use.
             raw_output = gr.Textbox(
                 label="Raw Output",
                 lines=4,