Claude
5e1cb8857d
tz-drift-check.sh + sky-cam-tzcheck timer notify when TIMEZONE no longer matches the machine's timezone (timers follow the machine, scripts follow TIMEZONE). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013wi3ZRpfenCe2TRwT4JFMG
50 lines
2.2 KiB
Bash
Executable File
50 lines
2.2 KiB
Bash
Executable File
#!/bin/bash
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# tz-drift-check.sh — warn if TIMEZONE (sky-cam.conf / .env) no longer matches
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# the machine's own timezone.
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#
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# systemd timers fire on the machine's clock, but sunrise.py, the capture
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# scripts and the per-day folder names use TIMEZONE. If the two drift apart
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# (someone ran `timedatectl set-timezone`, a cloud-init reset, a restored
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# image, a typo in .env...) every scheduled job runs at the wrong local time
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# and the sunrise capture window is off by the zone difference.
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#
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# Run daily by sky-cam-tzcheck.timer (and shortly after boot). Sends one
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# notify.sh message per run while the mismatch persists; silent when fine.
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# Exit 0 either way — a mismatch is a notification, not a job failure.
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set -uo pipefail
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SCRIPT_DIR="$(dirname "$(realpath "$0")")"
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source "$SCRIPT_DIR/sky-cam.conf"
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source "$SCRIPT_DIR/.env" 2>/dev/null || true
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# Machine's zone — read WITHOUT any TZ override so we see the real system value.
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sys_tz="$(env -u TZ timedatectl show -p Timezone --value 2>/dev/null)"
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[ -z "$sys_tz" ] && sys_tz="$(cat /etc/timezone 2>/dev/null)"
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[ -z "$sys_tz" ] && sys_tz="$(readlink /etc/localtime 2>/dev/null | sed 's|.*/zoneinfo/||')"
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if [ -z "$sys_tz" ]; then
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echo "tz-drift-check: could not determine the machine's timezone — skipping"
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exit 0
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fi
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# Compare by real UTC offsets across the year so aliases (US/Eastern vs
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# America/New_York) and identical-rule zones are not reported as drift.
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same=true
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if [ "$sys_tz" != "$TIMEZONE" ]; then
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for m in 01 04 07 10; do
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a="$(TZ="$sys_tz" date -d "2026-$m-15 12:00 UTC" +%z)"
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b="$(TZ="$TIMEZONE" date -d "2026-$m-15 12:00 UTC" +%z)"
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[ "$a" = "$b" ] || { same=false; break; }
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done
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fi
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if $same; then
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echo "Timezone OK: sky-cam TIMEZONE=$TIMEZONE, machine=$sys_tz"
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exit 0
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fi
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msg="sky-cam TIMEZONE is $TIMEZONE but this machine's timezone is $sys_tz. Scheduled jobs run on the machine clock, so sunrise/seasons/moon jobs will fire at the wrong local time. Fix: set TIMEZONE=$sys_tz in $SCRIPT_DIR/.env and re-run ./install.sh, or run: sudo timedatectl set-timezone $TIMEZONE"
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echo "WARNING: $msg"
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"$SCRIPT_DIR/notify.sh" "WARNING: sky-cam timezone mismatch" "$msg" || true
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exit 0
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