Abort execution when installation fails#177
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bradhe
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jo-sm,
konstantinoscs,
sammuti and
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Pull request overview
This PR ensures that application execution aborts immediately when dependency installation fails during startup, rather than continuing with broken dependencies. The implementation adds proper error handling for uv venv and uv sync failures, returning Crashed status with appropriate error variants.
Changes:
- Added error handling to abort execution when
uv venvoruv syncprocesses exit with non-zero codes - Created a test example app with intentionally broken dependencies to verify failure behavior
- Added test case to verify apps crash with non-zero exit code when dependency installation fails
Reviewed changes
Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| crates/tower-runtime/src/local.rs | Added exit code checks for venv creation and dependency sync processes, returning errors when they fail |
| crates/tower-runtime/src/errors.rs | Added DependencyInstallationFailed error variant |
| crates/tower-runtime/tests/local_test.rs | Added test to verify crash behavior on dependency installation failure |
| crates/tower-runtime/tests/example-apps/05-broken-dependencies/pyproject.toml | Created test app with non-existent dependency |
| crates/tower-runtime/tests/example-apps/05-broken-dependencies/main.py | Added placeholder script that should never execute |
| crates/tower-runtime/tests/example-apps/05-broken-dependencies/Towerfile | Created Towerfile configuration for broken dependencies test app |
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konstantinoscs
approved these changes
Jan 20, 2026
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Title says it all. When uv venv or uv sync fails during app startup, execution now aborts immediately with a
Crashedstatus (because the developer needs to fix the issue) instead of continuing. Added 05-broken-dependencies example app with an intentionally non-existent package and addedtest_abort_on_dependency_installation_failuretest that verifies the app crashes with a non-zero exit code when dependency installation fails.This was probably historically missed because the apps would fail anyway along the way.