Vladimir Buzalka
63 lines
2.8 KiB
Bash
63 lines
2.8 KiB
Bash
#!/bin/bash
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# GFS retence PLNYCH zaloh Medicus (kazda zaloha je kompletni -> mazani ostatnich je bezpecne).
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#
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# SEKVENCNI, POCITANE tiery (jdou ZA sebou, neprekryvaji se), od nejnovejsiho zpet:
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# 1) DENNI : poslednich 30 dni -> nech VSECHNY
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# 2) TYDENNI : pak presne 8 tydnu dozadu -> z kazdeho ISO-tydne 1x (nejnovejsi = konec tydne)
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# 3) MESICNI : pak presne 12 mesicu dozadu -> z kazdeho mesice 1x (nejnovejsi)
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# 4) starsi : smazat
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# Reference "ted" = datum NEJNOVEJSI zalohy. Datum se cte Z NAZVU MEDICUS_RRMMDD_HHMM.zip.
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#
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# BEZPECNOST: DRY_RUN=1 (default) jen vypisuje, NIC nemaze. DRY_RUN=0 skutecne maze.
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# Neznamy/neparsovatelny nazev se NIKDY nemaze.
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set -euo pipefail
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BACKUP_DIR="${BACKUP_DIR:-/mnt/user/OrdinaceSynology/MedicusBackup}"
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DAILY_DAYS="${DAILY_DAYS:-30}"
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WEEKLY_WEEKS="${WEEKLY_WEEKS:-8}"
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MONTHLY_MONTHS="${MONTHLY_MONTHS:-12}"
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DRY_RUN="${DRY_RUN:-1}"
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date_from_name() { local d="${1#MEDICUS_}"; d="${d:0:6}"; echo "20${d:0:2}-${d:2:2}-${d:4:2}"; }
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mapfile -t FILES < <(cd "$BACKUP_DIR" && ls -1 MEDICUS_*.zip 2>/dev/null | sort -r) # nejnovejsi prvni
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[ "${#FILES[@]}" -eq 0 ] && { echo "Zadne zalohy v $BACKUP_DIR"; exit 0; }
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REF=$(date_from_name "${FILES[0]}")
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date -d "$REF" >/dev/null 2>&1 || { echo "CHYBA: nelze precist datum z ${FILES[0]}"; exit 1; }
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D_CUT=$(date -d "$REF -${DAILY_DAYS} days" +%F)
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echo "REF=$REF denni>=$D_CUT, pak ${WEEKLY_WEEKS}x tydenni, pak ${MONTHLY_MONTHS}x mesicni (starsi smazat)"
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declare -A KEEP seen_week seen_month
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dn=0; w=0; m=0
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for f in "${FILES[@]}"; do
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dt=$(date_from_name "$f")
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if ! date -d "$dt" >/dev/null 2>&1; then KEEP[$f]="?"; continue; fi # neparsovatelne -> ponechat
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if [[ ! "$dt" < "$D_CUT" ]]; then KEEP[$f]="d"; dn=$((dn+1)); continue; fi # 1) denni (30 dni)
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if [ "$w" -lt "$WEEKLY_WEEKS" ]; then # 2) tydenni (8x)
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wk=$(date -d "$dt" +%G-%V)
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[ -z "${seen_week[$wk]:-}" ] && { seen_week[$wk]=1; w=$((w+1)); KEEP[$f]="w"; }
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continue
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fi
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if [ "$m" -lt "$MONTHLY_MONTHS" ]; then # 3) mesicni (12x)
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mo=$(date -d "$dt" +%Y-%m)
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[ -z "${seen_month[$mo]:-}" ] && { seen_month[$mo]=1; m=$((m+1)); KEEP[$f]="m"; }
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continue
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fi
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done
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mode="DRY-RUN (nic se nemaze)"; [ "$DRY_RUN" = "0" ] && mode="OSTRY (maze!)"
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echo "=== GFS retence $mode | $BACKUP_DIR ==="
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echo "schema: ${DAILY_DAYS}d / ${WEEKLY_WEEKS}t / ${MONTHLY_MONTHS}m | celkem: ${#FILES[@]} | ponechano: ${#KEEP[@]} (denni=$dn tydenni=$w mesicni=$m)"
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del=0
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for f in "${FILES[@]}"; do
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if [ -n "${KEEP[$f]:-}" ]; then
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printf ' KEEP [%s] %s\n' "${KEEP[$f]}" "$f"
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else
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printf ' DEL %s\n' "$f"; del=$((del+1))
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[ "$DRY_RUN" = "0" ] && rm -f -- "$BACKUP_DIR/$f"
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fi
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done
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echo "=== ke smazani: $del ==="
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