Fix SERVER_START_CMD environment variable (#320)

* Fix entrypoint for published servers

* iterate

* use subshell in entrypoint for env var resolution

* fix dead doc link

* Revert "fix dead doc link"

This reverts commit 6475f3c.

* fix entrypoint

* fix test

* add SERVER_START_CMD to dockerfile

* fix diff test

* bump dev12

* bump to 0.4.6

* fix dockerfile

---------

Co-authored-by: Bola Malek <bola@baseten.co>

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "truss"
-version = "0.4.6dev10"
+version = "0.4.6"
 description = "A seamless bridge from model development to model delivery"
 license = "MIT"
 readme = "README.md"

truss/templates/server.Dockerfile.jinja

@@ -64,9 +64,11 @@ COPY ./{{config.data_dir}} /app/data
 ENV HASH_TRUSS {{truss_hash}}
 ENV CONTROL_SERVER_PORT 8080
 ENV INFERENCE_SERVER_PORT 8090
+ENV SERVER_START_CMD="/control/.env/bin/python3 /control/control/server.py"
 ENTRYPOINT ["/control/.env/bin/python3", "/control/control/server.py"]
     {%- else %}
 ENV INFERENCE_SERVER_PORT 8080
-ENTRYPOINT $PYTHON_EXECUTABLE /app/inference_server.py
+ENV SERVER_START_CMD="{{(config.base_image.python_executable_path or "python3") ~ " /app/inference_server.py"}}"
+ENTRYPOINT ["{{config.base_image.python_executable_path or "python3"}}", "/app/inference_server.py"]
     {%- endif %}
 {% endblock %}

truss/test_data/server.Dockerfile

@@ -48,4 +48,5 @@ COPY ./data /app/data
 COPY ./packages /packages
 
 ENV INFERENCE_SERVER_PORT 8080
-ENTRYPOINT $PYTHON_EXECUTABLE /app/inference_server.py
+ENV SERVER_START_CMD="/usr/local/bin/python3 /app/inference_server.py"
+ENTRYPOINT ["/usr/local/bin/python3", "/app/inference_server.py"]