Block commands from being run in fish terminal before sourcing activate.fish #25863
Closed as not planned
Description
Type: Bug
Behaviour
When you open a fish terminal, it source's the project's .venv/bin/activate.fish. But there's usually a long delay before this command is actually run, which means you can often start typing your own command before this runs, and it gets pasted to the end of your command, causing an error. As a result, the Python venv doesn't get activated properly. I can see how it tries to work around this by entering ^C before the source to cancel any command that is currently being typed, but if you're a fast typer you can easily get a keystroke in between the ^C and the source and still get an error.
Steps to reproduce:
- Open a fish terminal
- Quickly press and hold any key
You end up with an error like this:
Welcome to fish, the friendly interactive shell
Type help for instructions on how to use fish
rydong@ubuntu2404-012 ~/p/cs-444-compiler (main)> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa^C
rydong@ubuntu2404-012 ~/p/cs-444-compiler (main)> aaasource /u4/rydong/projects/cs-444-compiler/.venv/bin/activate.fish
aaaaaaaaaaaaaasource: command not found
a⏎
rydong@ubuntu2404-012 ~/p/cs-444-compiler (main) [127]>
Now notice how the virtual environment is not activated in the latest command prompt.
Diagnostic data
Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)
XXX
Extension version: 2026.4.0
VS Code version: Code 1.110.1 (61b3d0ab13be7dda2389f1d3e60a119c7f660cc3, 2026-03-06T23:03:27.520Z)
OS version: Linux x64 6.19.7-200.fc43.x86_64 snap
Modes:
Remote OS version: Linux x64 6.8.0-90-generic
- Python version (& distribution if applicable, e.g. Anaconda): 3.12.3
- Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
- Value of the
python.languageServersetting: Default
User Settings
languageServer: "None"
Installed Extensions
| Extension Name | Extension Id | Version |
|---|---|---|
| cmake-tools | ms- | 1.22.28 |
| colab | goo | 0.4.1 |
| cpp-devtools | ms- | 0.3.6 |
| cpptools | ms- | 1.30.5 |
| cpptools-extension-pack | ms- | 1.5.1 |
| debugpy | ms- | 2025.18.0 |
| even-better-toml | tam | 0.21.2 |
| geminicodeassist | goo | 2.75.0 |
| isort | ms- | 2025.0.0 |
| js-debug | ms- | 1.110.0 |
| jupyter | ms- | 2025.9.1 |
| jupyter-renderers | ms- | 1.3.0 |
| lldb-dap | llv | 0.4.1 |
| makefile-tools | ms- | 0.12.17 |
| marmoset | uwa | 0.2.0 |
| pyrefly | met | 0.55.0 |
| python | ms- | 2026.4.0 |
| quarto | qua | 1.130.0 |
| r | REd | 2.8.7 |
| ruff | cha | 2026.36.0 |
| vscode-ansi | ili | 1.1.7 |
| vscode-clangd | llv | 0.4.0 |
| vscode-js-profile-table | ms- | 1.0.10 |
| vscode-jupyter-cell-tags | ms- | 0.1.9 |
| vscode-jupyter-slideshow | ms- | 0.1.6 |
| vscode-just-syntax | nef | 0.9.0 |
| vscode-pandoc | Chr | 0.7.1 |
| vscode-pylance | ms- | 2026.1.1 |
| vscode-python-envs | ms- | 1.22.0 |
| vscode-yaml | red | 1.21.0 |
System Info
| Item | Value |
|---|---|
| CPUs | AMD Ryzen AI 9 365 w/ Radeon 880M (20 x 1588) |
| GPU Status | 2d_canvas: unavailable_software GPU0: VENDOR= 0xffff [Google Inc. (Google)], DEVICE=0xffff [ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0DE)), SwiftShader driver-5.0.0)], DRIVER_VENDOR=SwANGLE, DRIVER_VERSION=5.0.0 ACTIVE Machine model name: Machine model version: direct_rendering_display_compositor: disabled_off_ok gpu_compositing: disabled_software multiple_raster_threads: enabled_on opengl: disabled_off rasterization: disabled_software raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: disabled_software video_encode: disabled_software vulkan: disabled_off webgl: unavailable_software webgl2: unavailable_software webgpu: disabled_off webnn: unavailable_software |
| Load (avg) | 1, 0, 0 |
| Memory (System) | 27.18GB (21.16GB free) |
| Process Argv | --no-sandbox --ozone-platform=x11 --crash-reporter-id 39b311f9-f807-4c48-b8a8-444961774cc1 |
| Screen Reader | no |
| VM | 0% |
| DESKTOP_SESSION | gnome |
| XDG_CURRENT_DESKTOP | GNOME |
| XDG_SESSION_DESKTOP | gnome |
| XDG_SESSION_TYPE | wayland |
| Item | Value |
|---|---|
| Remote | SSH: uwcs |
| OS | Linux x64 6.8.0-90-generic |
| CPUs | AMD EPYC 9754 128-Core Processor (64 x 0) |
| Memory (System) | 1006.49GB (926.60GB free) |
| VM | 0% |
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