fix: survive short network outages when downloading (#2953)

* fix: use exponential backoff when a download fails

The retry used a flat 3 second wait over 3 attempts, which covers only
about 6 seconds of downtime. A CI runner lost DNS for approximately a
minute and the PyPy download failed. Wait 3, 6, 12, 24, then 48 seconds
over 6 attempts.

Assisted-by: ClaudeCode:claude-opus-5

* ci: raise the uv HTTP retry count

uv stops after 3 retries, which was too few when a runner lost DNS for
approximately a minute during a test run.

Assisted-by: ClaudeCode:claude-opus-5

* fix: do not retry a download after a client error

A bad URL will not fix itself, and the longer backoff made the wait
before the report about 93 seconds. Report 4xx responses at once, and
keep retrying 5xx.

Assisted-by: ClaudeCode:claude-opus-5

This commit is contained in:

Henry Schreiner

2026-08-02 07:01:14 +02:00

committed by

GitHub

parent f05f72d4c1

commit b2533d3833

3 changed files with 150 additions and 2 deletions

									
										.github/workflows/test.yml
									
		+4
		
												View File
												
				@@ -34,6 +34,10 @@ concurrency:

				  group: test-${{ github.ref }}

				  cancel-in-progress: true

				env:

				  # runners see short DNS/network outages; uv's default of 3 retries is too few

				  UV_HTTP_RETRIES: "6"

				jobs:

				  lint:

				    name: Linters (mypy, ruff, etc.)