Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
143 lines
4.0 KiB
Bash
143 lines
4.0 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-10-10; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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set -Ceuo pipefail
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#######################################
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# Minimal leap-second probe for Debian/chrony systems
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# - Prints kernel leap flags & TAI offset (ΔAT)
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# - Reads tzdata's leap-seconds list (authoritative TAI-UTC)
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# - Shows chrony tracking summary (incl. leap status)
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# - Demonstrates 23:59:60 rendering via TZ=right/UTC
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# Globals:
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# None
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# Arguments:
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# None
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# Returns:
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# 0: on success
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#######################################
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main() {
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### 1) System TZ and tzdata source.
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printf "System TZ link: [%s]\n\n" "$(readlink -f /etc/localtime || true)"
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if [[ -f /usr/share/zoneinfo/leap-seconds.list ]]; then
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declare tz_leap_line tz_tai tz_ntp ts_human
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tz_leap_line="$(awk '($1 !~ /^#/) {L=$0} END{print L}' /usr/share/zoneinfo/leap-seconds.list)"
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tz_ntp="$(awk '{print $1}' <<<"${tz_leap_line}")"
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tz_tai="$(awk '{print $2}' <<<"${tz_leap_line}")"
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ts_human="$(awk -F'#' '{gsub(/^[[:space:]]+/, "", $2); print $2}' <<<"${tz_leap_line}")"
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printf "tzdata ΔAT (TAI-UTC): %s s [last change at: %s; NTP ts: %s]\n\n" "${tz_tai:-?}" "${ts_human:-?}" "${tz_ntp:-?}"
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else
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printf "tzdata leap-seconds.list not found.\n"
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fi
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### 2) Kernel view (requires adjtimex).
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if command -v adjtimex >/dev/null 2>&1; then
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printf "Kernel time status (adjtimex -p):\n"
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adjtimex -p | sed 's/^/ /'
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declare k_tai
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k_tai="$(adjtimex -p | awk '/^tai:/ {print $2}')"
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if [[ -n "${k_tai:-}" ]]; then
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printf "Kernel-exported ΔAT [tai]: %s s\n" "${k_tai}"
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fi
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else
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printf "Package: 'adjtimex' not found. Install 'adjtimex' for kernel leap/TAI details.\n\n"
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fi
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### 3) Chrony summary.
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if command -v chronyc >/dev/null 2>&1; then
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printf "\n"
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printf "chronyc tracking:\n"
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chronyc -n tracking | sed 's/^/ /'
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else
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printf "Package: 'chronyc' not found. Skipping chrony status.\n\n"
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fi
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### 4) right/UTC demonstration of 23:59:60 (uses 2016-12-31 leap).
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if [[ -f /usr/share/zoneinfo/right/UTC ]]; then
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printf "\n"
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printf "right/UTC leap rendering check (expect 23:59:60):\n\n"
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TZ=right/UTC date -ud '2017-01-01 00:00:00 -1 second' || true
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else
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printf "\n"
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printf "File: 'tzdata right/UTC' zone not installed; skipping 23:59:60 demo.\n\n"
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fi
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printf "\n"
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printf "Hint:\n"
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printf " • ΔAT (TAI-UTC) should match tzdata and kernel (chrony sets kernel TAI if leapsectz/leapseclist is used).\n"
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printf " • For monotonic intervals, apps must use CLOCK_MONOTONIC, not CLOCK_REALTIME.\n"
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return 0
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}
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### Build right/UTC from tzdata leap table if missing.
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if [[ ! -e /usr/share/zoneinfo/right/UTC ]]; then
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install -d -m 0755 /usr/share/zoneinfo/right
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### Minimal zic source for a fixed UTC zone.
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declare -r tmp_src="/tmp/UTC.src"
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printf 'Zone UTC 0 - UTC\n' > "${tmp_src}"
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### Prefer the zic-format leapseconds file.
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declare leap_zic="/usr/share/zoneinfo/leapseconds"
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if [[ -s "${leap_zic}" ]]; then
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zic -d /usr/share/zoneinfo/right -L "${leap_zic}" "${tmp_src}"
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else
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echo "WARNING: ${leap_zic} not found; building right/UTC without leap info." >&2
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zic -d /usr/share/zoneinfo/right -L /dev/null "${tmp_src}"
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fi
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rm -f "${tmp_src}"
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fi
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if [[ -e /usr/share/zoneinfo/right/UTC ]]; then
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### Expect to see 'Sat Dec 31 23:59:60 UTC 2016' rendered in right/UTC
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TZ=right/UTC date -ud '2017-01-01 00:00:00 -1 second' || true
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fi
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main "$@"
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exit 0
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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