Merge pull request #13558 from Luap99/compose-flake

fix compose test flake

test/compose/slirp4netns_opts/tests.sh

@@ -3,4 +3,18 @@
 output="$(cat $OUTFILE)"
 expected="teststring"
 
+# Reading from the nc socket is flaky because docker-compose only starts
+# the containers. We cannot know at this point if the container did already
+# send the message. Give the container 5 seconds time to send the message
+# to prevent flakes.
+local _timeout=5
+while [ $_timeout -gt 0 ]; do
+    if [ -n "$output" ]; then
+        break
+    fi
+    sleep 1
+    _timeout=$(($_timeout - 1))
+    output="$(cat $OUTFILE)"
+done
+
 is "$output" "$expected" "$testname : nc received teststring"