build fails to use shell configured python

[thoraxe]

System Info

θ82° [thoraxe:~/.llama/distributions/remote-vllm] [ols-llamastack] 130 $ llama stack build --image-type venv
> Enter a name for your Llama Stack (e.g. my-local-stack): stack
> Enter the image type you want your Llama Stack to be built as (container or conda or venv): venv

Llama Stack is composed of several APIs working together. Let's select
the provider types (implementations) you want to use for these APIs.

Tip: use <TAB> to see options for the providers.

> Enter provider for API inference: remote::openai
> Enter provider for API safety: inline::llama-guard
> Enter provider for API agents: inline::meta-reference
> Enter provider for API vector_io: inline::meta-reference
> Enter provider for API datasetio: inline::localfs
> Enter provider for API scoring: inline::basic
> Enter provider for API eval: inline::meta-reference
> Enter provider for API post_training: inline::torchtune
> Enter provider for API tool_runtime: remote::model-context-protocol
> Enter provider for API telemetry: inline::meta-reference
 
 > (Optional) Enter a short description for your Llama Stack:
Using virtual environment llamastack-stack
Using CPython 3.9.21 interpreter at: /usr/bin/python3.9
Creating virtual environment at: llamastack-stack
Activate with: source llamastack-stack/bin/activate
Using Python 3.9.21 environment at: llamastack-stack
  × No solution found when resolving dependencies:
  ╰─▶ Because the current Python version (3.9.21) does not satisfy Python>=3.10 and all versions of llama-stack depend on Python>=3.10, we can conclude that all versions of llama-stack cannot be used.
      And because you require llama-stack, we can conclude that your requirements are unsatisfiable.
ERROR    2025-03-27 10:40:52,379 llama_stack.distribution.build:128 uncategorized: Failed to build target               
         llamastack-stack with return code 1                                                                            
Error building stack: Failed to build image llamastack-stack
θ87° [thoraxe:~/.llama/distributions/remote-vllm] [ols-llamastack] 1m13s 1 $ python --version
Python 3.11.5
θ78° [thoraxe:~/.llama/distributions/remote-vllm] [ols-llamastack] $ which python
~/.pyenv/shims/python

Information

• The official example scripts
• My own modified scripts

🐛 Describe the bug

.

Error logs

.

Expected behavior

.

[terrytangyuan]

Seems like it did not use your Python 3.11.5 in your shell. I'd recommend using uv when running the llama build command.

[thoraxe]

just using uv results in the same error:

uv run llama stack build
> Enter a name for your Llama Stack (e.g. my-local-stack): stack
> Enter the image type you want your Llama Stack to be built as (container or conda or venv): venv

Llama Stack is composed of several APIs working together. Let's select
the provider types (implementations) you want to use for these APIs.

Tip: use <TAB> to see options for the providers.

> Enter provider for API inference: remote::anthropic
> Enter provider for API safety: inline::llama-guard
> Enter provider for API agents: inline::meta-reference
> Enter provider for API vector_io: inline::faiss
> Enter provider for API datasetio: inline::localfs
> Enter provider for API scoring: inline::basic
> Enter provider for API eval: inline::meta-reference
> Enter provider for API post_training: inline::torchtune
> Enter provider for API tool_runtime: inline::code-interpreter
> Enter provider for API telemetry: inline::meta-reference
 
 > (Optional) Enter a short description for your Llama Stack:
Environment 'llamastack-stack' already exists, re-using it.
Using virtual environment llamastack-stack
Using CPython 3.9.21 interpreter at: /usr/bin/python3.9
Creating virtual environment at: llamastack-stack
Activate with: source llamastack-stack/bin/activate
Using Python 3.9.21 environment at: llamastack-stack
  × No solution found when resolving dependencies:
  ╰─▶ Because the current Python version (3.9.21) does not satisfy Python>=3.10 and all versions of llama-stack depend on Python>=3.10, we can conclude that all versions of llama-stack cannot be used.
      And because you require llama-stack, we can conclude that your requirements are unsatisfiable.
ERROR    2025-03-28 14:19:00,686 llama_stack.distribution.build:128 uncategorized: Failed to build target               
         llamastack-stack with return code 1                                                                            
Error building stack: Failed to build image llamastack-stack

[thoraxe]

Even forcibly running with python as a module doesn't fix the problem:

python -m llama_stack.cli.llama stack build
> Enter a name for your Llama Stack (e.g. my-local-stack): stack
> Enter the image type you want your Llama Stack to be built as (container or conda or venv): venv

Llama Stack is composed of several APIs working together. Let's select
the provider types (implementations) you want to use for these APIs.

Tip: use <TAB> to see options for the providers.

> Enter provider for API inference: remote::anthropic
> Enter provider for API safety: inline::prompt-guard
> Enter provider for API agents: inline::meta-reference
> Enter provider for API vector_io: inline::meta-reference
> Enter provider for API datasetio: inline::localfs
> Enter provider for API scoring: inline::basic
> Enter provider for API eval: inline::meta-reference
> Enter provider for API post_training: inline::torchtune
> Enter provider for API tool_runtime: inline::rag-runtime
> Enter provider for API telemetry: inline::meta-reference
 
 > (Optional) Enter a short description for your Llama Stack:
Environment 'llamastack-stack' already exists, re-using it.
Using virtual environment llamastack-stack
Using CPython 3.9.21 interpreter at: /usr/bin/python3.9
Creating virtual environment at: llamastack-stack
Activate with: source llamastack-stack/bin/activate
Using Python 3.9.21 environment at: llamastack-stack
  × No solution found when resolving dependencies:
  ╰─▶ Because the current Python version (3.9.21) does not satisfy Python>=3.10 and all versions of llama-stack depend on Python>=3.10, we can conclude that all versions of llama-stack cannot be used.
      And because you require llama-stack, we can conclude that your requirements are unsatisfiable.
ERROR    2025-03-28 14:32:05,971 llama_stack.distribution.build:128 uncategorized: Failed to build target               
         llamastack-stack with return code 1                                                                            
Error building stack: Failed to build image llamastack-stack

[thoraxe]

#1170 (comment) appears to be a workaround

thanks to @bbrowning for the find

[bbrowning]

I wonder if we should set the UV_PYTHON environment variable ourselves to the currently running Python installation before calling uv venv at

llama-stack/llama_stack/distribution/build_venv.sh

Line 86 in 37b6da3

uv venv "$env_name"

if that env variable is not already set? That would still allow the user to explicitly set UV_PYTHON to choose a different interpreter, but would allow this to just work in the case reported here without the user having to explicitly set UV_PYTHON.