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Pau Espin Pedrol gerrit-no-reply at lists.osmocom.orgReview at https://gerrit.osmocom.org/6474 ttcn3-tcpdump-start.sh: Wait for pcap file creation to start test It was spotted in the jenkins artficats that pcap files for some tests are missing. It is probably due to the fact that tcpdump is started in the background and immediately after the test is started. Some tests are really quick, which means they are executing before tcpdump starts creating the file and recording. While still having the file created doesn't mean tcpdump is already recording, we at least ensure the file is created and we can see it's empty at the end. Running this patch in my PC indeed shows that usually the pcap file is not created immediately after and it waits for 1 second to continue. The hack to make sure tcpdump is already recording before starting the test is to create some traffic (ie ping 127.0.0.1) and then check the following condition: $(tcpdump -r file.pcap | wc -l) -gt 0 Change-Id: I17a456a27c8e33571f333f4b7efdf61161ebb174 --- M ttcn3-tcpdump-start.sh 1 file changed, 10 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/74/6474/1 diff --git a/ttcn3-tcpdump-start.sh b/ttcn3-tcpdump-start.sh index 664c080..343f398 100755 --- a/ttcn3-tcpdump-start.sh +++ b/ttcn3-tcpdump-start.sh @@ -22,3 +22,13 @@ $CMD -s 0 -n -i any -w "$TTCN3_PCAP_PATH/$TESTCASE.pcap" >$TTCN3_PCAP_PATH/$TESTCASE.pcap.log 2>&1 & PID=$! echo $PID > $PIDFILE + +# Wait until tcpdump creates the pcap file to give it some time to start listenting. +# Timeout is 10 seconds. +i=0 +while [ ! -f "$TTCN3_PCAP_PATH/$TESTCASE.pcap" ] && [ $i -lt 10 ] +do + sleep 1 + echo "Waiting for tcpdump to start... $i" + i=$((i+1)) +done -- To view, visit https://gerrit.osmocom.org/6474 To unsubscribe, visit https://gerrit.osmocom.org/settings Gerrit-MessageType: newchange Gerrit-Change-Id: I17a456a27c8e33571f333f4b7efdf61161ebb174 Gerrit-PatchSet: 1 Gerrit-Project: osmo-ttcn3-hacks Gerrit-Branch: master Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>