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whyour
5801f735bc
Preserve literal paths and arguments, use portable command options, validate startup configuration, and retain scripts when downloads fail. Ensure task watchdogs and process groups are cleaned up across Bash versions, with compatibility and process lifecycle regression coverage.
76 lines
2.7 KiB
Bash
76 lines
2.7 KiB
Bash
#!/usr/bin/env bash
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# Fork from the current Bash state: an external `bash -c` would lose private
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# before-hook variables, arrays and functions used by sourced Shell scripts.
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run_task_command() {
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local timeout_seconds
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if [[ -z ${command_timeout_time:-} ]]; then
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"$@"
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return $?
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fi
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timeout_seconds=$(awk -v value="$command_timeout_time" 'BEGIN {
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if (value !~ /^([0-9]+([.][0-9]*)?|[.][0-9]+)([eE][+-]?[0-9]+)?[smhd]?$/) exit 1
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unit = substr(value, length(value), 1)
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factor = unit == "d" ? 86400 : unit == "h" ? 3600 : unit == "m" ? 60 : 1
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printf "%.9f", (value + 0) * factor
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}') || { printf 'Invalid task timeout: %s\n' "$command_timeout_time" >&2; return 125; }
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if [[ $timeout_seconds == '0.000000000' ]]; then
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"$@"
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return $?
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fi
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(
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timeout_dir=$(mktemp -d "${TMPDIR:-/tmp}/ql-task-timeout.XXXXXXXX") || exit 125
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# Both children get private process groups. The timer and the wrapper must
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# survive terminating the task, and descendants must not outlive a timeout.
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set -m
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( set +m; "$@" ) <&0 &
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timeout_worker=$!
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(
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set +m
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: > "$timeout_dir/ready"
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sleep "$timeout_seconds" || exit 125
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: > "$timeout_dir/expired"
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kill -TERM -- "-$timeout_worker" 2>/dev/null || :
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sleep 0.5
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kill -KILL -- "-$timeout_worker" 2>/dev/null || :
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) &
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timeout_watcher=$!
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set +m
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finish_task_timeout() {
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local code="$1"
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trap - EXIT
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{
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# Bash can report a killed job between any two cleanup commands.
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# Keep redirection active until the watchdog is fully reaped.
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kill -KILL -- "-$timeout_watcher" || :
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wait "$timeout_watcher" || :
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} 2>/dev/null
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if kill -TERM -- "-$timeout_worker" 2>/dev/null; then sleep 0.1; fi
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kill -KILL -- "-$timeout_worker" 2>/dev/null || :
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wait "$timeout_worker" 2>/dev/null || :
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rm -rf -- "$timeout_dir"
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exit "$code"
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}
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# Older Bash can omit a subshell's EXIT trap in sourced pipelines. Call
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# cleanup explicitly on completion/signals, retaining EXIT as a fallback.
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trap 'finish_task_timeout "$?"' EXIT
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trap 'finish_task_timeout 130' INT
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trap 'finish_task_timeout 143' TERM
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trap 'finish_task_timeout 129' HUP
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trap 'finish_task_timeout 131' QUIT
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# Do not clean up a timer whose process group has not initialized yet.
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while [[ ! -f "$timeout_dir/ready" ]]; do
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kill -0 "$timeout_watcher" 2>/dev/null || finish_task_timeout 125
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sleep 0.001
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done
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wait "$timeout_worker"
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timeout_code=$?
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if [[ -f "$timeout_dir/expired" ]]; then
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# Let the timer finish escalation even if the task leader exited first.
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wait "$timeout_watcher" 2>/dev/null || :
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finish_task_timeout 124
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fi
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finish_task_timeout "$timeout_code"
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)
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}
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