27 lines
959 B
Bash
27 lines
959 B
Bash
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#!/bin/sh
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# Loops forever: sleeps until the next BACKUP_HOUR:BACKUP_MINUTE UTC, then runs backup_db.sh.
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# Defaults: 02:30 UTC nightly.
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set -eu
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HOUR="${BACKUP_HOUR:-2}"
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MINUTE="${BACKUP_MINUTE:-30}"
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if [ "${BACKUP_RUN_ON_START:-0}" = "1" ]; then
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echo "[$(date -u +%FT%TZ)] BACKUP_RUN_ON_START=1 — running backup immediately"
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/app/backup_db.sh || echo "[$(date -u +%FT%TZ)] initial backup failed (continuing)"
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fi
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while true; do
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NOW_EPOCH=$(date -u +%s)
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TARGET=$(date -u -d "today ${HOUR}:${MINUTE}:00" +%s 2>/dev/null \
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|| date -u -j -f "%H:%M:%S" "${HOUR}:${MINUTE}:00" +%s)
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if [ "$TARGET" -le "$NOW_EPOCH" ]; then
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TARGET=$((TARGET + 86400))
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fi
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SLEEP=$((TARGET - NOW_EPOCH))
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echo "[$(date -u +%FT%TZ)] next backup in ${SLEEP}s (at $(date -u -d "@${TARGET}" +%FT%TZ 2>/dev/null || date -u -r "${TARGET}" +%FT%TZ))"
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sleep "$SLEEP"
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/app/backup_db.sh || echo "[$(date -u +%FT%TZ)] backup failed (will retry tomorrow)"
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done
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