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Explain how to find errors in CI (#5080)

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teor 2022-09-06 07:43:24 +10:00 committed by GitHub
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book/src/dev/continuous-integration.md
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@ -35,6 +35,24 @@ Tests can depend on:
To support this test state, some Docker tests depend on other tests finishing first.
This means that the entire workflow must be re-run when a single test fails.
### Finding Errors
Look for the earliest job that failed, and find the earliest failure.
For example, this failure doesn't tell us what actually went wrong:
> Error: The template is not valid. ZcashFoundation/zebra/.github/workflows/build-docker-image.yml@8bbc5b21c97fafc83b70fbe7f3b5e9d0ffa19593 (Line: 52, Col: 19): Error reading JToken from JsonReader. Path '', line 0, position 0.
https://github.com/ZcashFoundation/zebra/runs/8181760421?check_suite_focus=true#step:41:4
But the specific failure is a few steps earlier:
> #24 2117.3 error[E0308]: mismatched types
> ...
https://github.com/ZcashFoundation/zebra/runs/8181760421?check_suite_focus=true#step:8:2112
The earlier failure can also be in another job, check out the whole workflow run for details.
(Use the "Summary" button on the top left of the job details, and zoom in.)
### Resolving CI Sync Timeouts
CI sync jobs near the tip will take different amounts of time as: