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67 lines
2.0 KiB
Bash
Executable File
67 lines
2.0 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2017 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script generate kernel log in given rate.
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# Note that this only works for journald.
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# Note that this script can't be used to test multi-line patterns, because
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# the test kernel log lines may be splitted by real kernel log.
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# PROBLEM is the path to the problem log.
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PROBLEM=${PROBLEM:-""}
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# LINES_PER_SECOND is the log generating rate.
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LINES_PER_SECOND=${LINES_PER_SECOND:-1}
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# LOG_PATH is the path to generate kernel logs.
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LOG_PATH=${LOG_PATH:-"/dev/kmsg"}
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# RUN_ONCE specifies whether to keep generating problem logs or only
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# generate once.
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RUN_ONCE=${RUN_ONCE:-"false"}
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if [[ -z ${PROBLEM} ]]; then
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echo "$(basename $0): PROBLEM is empty"
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exit 1
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fi
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# now returns the current unix time in micro seconds
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now() {
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echo $(($(date +'%s%N') / 1000))
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}
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prefix="kernel: "
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logs=$(<${PROBLEM})
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lines=$(printf "%s\n" "${logs}" | wc -l)
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current_lines=0
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start=$(now)
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while true; do
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while read log; do
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echo "${prefix}${log}" >> ${LOG_PATH}
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((current_lines++))
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if [[ ${current_lines} == ${LINES_PER_SECOND} ]]; then
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current_lines=0
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current=$(now)
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duration=$((1000000 - current + start))
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if [[ ${duration} -gt 0 ]]; then
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echo "generated ${LINES_PER_SECOND} lines of log, sleep for ${duration}"
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usleep ${duration}
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fi
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start=$(now)
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fi
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done <<< "$logs"
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if [[ "${RUN_ONCE}" == "true" ]]; then
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echo "stop the generator"
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exit 0
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fi
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done
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