sniffer: improve handling of tcpdump termination #2321
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Let's improve the handling of tcpdump termination by the Sniff utility in two main directions:
Don't return an error if tcpdump successfully exited before we determined it was ready. This can happen when running in sanity mode, as tcpdump exits after capturing a single packet matching the filter. Fixes the
Failed to execute tcpdump: %!w(<nil>)'
flake.Explicitly assert that tcpdump didn't terminate in advance when running in assert mode, as otherwise we may have missed packets.