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Bash trap Cleanup for a Temporary Directory

Create a private temp directory with mktemp and remove it reliably from an EXIT trap, preserving the original exit status and signals.

BashResilience

Code

snippet
#!/usr/bin/env bash
set -euo pipefail

umask 077

work_dir=""

cleanup() {
    local status=$?
    trap - EXIT INT TERM
    if [[ -n "$work_dir" && -d "$work_dir" ]]; then
        rm -rf -- "$work_dir" || true
    fi
    exit "$status"
}

trap cleanup EXIT
trap 'exit 130' INT
trap 'exit 143' TERM

work_dir="$(mktemp -d "${TMPDIR:-/tmp}/report.XXXXXX")"
report="$work_dir/report.txt"

{
    printf 'generated_at=%s\n' "$(date -u +%Y-%m-%dT%H:%M:%SZ)"
    printf 'script=%s\n' "${BASH_SOURCE[0]}"
    printf 'pid=%s\n' "$"
} > "$report"

cat -- "$report"
printf 'work_dir_before_cleanup=%s\n' "$work_dir"

if [[ "${SIMULATE_FAILURE:-0}" == "1" ]]; then
    printf 'simulated failure; cleanup still runs\n' >&2
    exit 1
fi

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