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tests: k8s: retry "kubectl exec" on empty output

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Retry "kubectl exec" a few times if it unexpectedly produced an empty
output string.

This is an attempt to work around test failures similar to:

https://github.com/kata-containers/kata-containers/actions/runs/13840930994/job/38730153687?pr=10983

not ok 1 Environment variables
(from function `grep_pod_exec_output' in file tests_common.sh, line 394,
 in test file k8s-env.bats, line 36)
`grep_pod_exec_output "${pod_name}" "HOST_IP=\([0-9]\+\(\.\|$\)\)\{4\}" "${exec_command[@]}"' failed

That test obtained correct ouput from "sh -c printenv" one time, but the
second execution of the same command returned an empty output string.

Signed-off-by: Dan Mihai <dmihai@microsoft.com>
This commit is contained in:
Dan Mihai 2025-03-13 23:13:54 +00:00
parent b910daf625
commit dab981b0bc
1 changed files with 18 additions and 3 deletions
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21
tests/integration/kubernetes/tests_common.sh
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@ -378,6 +378,9 @@ teardown_common() {
# Invoke "kubectl exec", log its output, and check that a grep pattern is present in the output.
#
# Retry "kubectl exec" several times in case it unexpectedly returns an empty output string,
# in an attempt to work around issues similar to https://github.com/kubernetes/kubernetes/issues/124571.
#
# Parameters:
# $1 - pod name
# $2 - the grep pattern
@ -388,8 +391,20 @@ grep_pod_exec_output() {
shift
local -r grep_arg="$1"
shift
local grep_out=""
local cmd_out=""
local -r pod_env=$(kubectl exec "${pod_name}" -- "$@")
info "pod_env: ${pod_env}"
echo "${pod_env}" | grep "${grep_arg}"
for _ in {1..10}; do
info "Executing in pod ${pod_name}: $*"
cmd_out=$(kubectl exec "${pod_name}" -- "$@")
if [[ -n "${cmd_out}" ]]; then
info "command output: ${cmd_out}"
grep_out=$(echo "${cmd_out}" | grep "${grep_arg}")
info "grep output: ${grep_out}"
break
fi
warn "Empty output from kubectl exec"
sleep 1
done
[[ -n "${grep_out}" ]]
}