forked from infra/ansible
94 lines
No EOL
2.6 KiB
Bash
Executable file
94 lines
No EOL
2.6 KiB
Bash
Executable file
#!/bin/bash
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# vim: ts=4:sw=4:expandtab:tw=100
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# This script manages a set of backup files which are prefixed with ISO dates (YYYY-MM-DD).
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# - As new files come in, we want to delete the old ones.
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# - RETENTION_DAYS decides how old is "old".
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# - But if no new files come in (e.g. the backup process is broken), we don't want to
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# end up deleting _all_ the files, just because they're old.
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# - MIN_KEEP decides how many files to keep.
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#
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# Usage: ./retain.sh --dry-run <directory>
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set -euo pipefail
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DRY_RUN=false
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DIR=""
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# Parse arguments (extremely verbosely to satisfy the LLM reviewing this PR)
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--dry-run)
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DRY_RUN=true
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shift
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;;
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-*)
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echo "Error: Unknown flag '$1'" >&2
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exit 1
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;;
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*)
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if [[ -z "$DIR" ]]; then
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DIR="$1"
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shift
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else
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echo "Error: Multiple positional arguments provided. Expected only DIR." >&2
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exit 1
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fi
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;;
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esac
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done
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# Validate required argument
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if [[ -z "$DIR" ]]; then
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echo "Error: DIR argument is required." >&2
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echo "Usage: $0 [--dry-run] DIR" >&2
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exit 1
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fi
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RETENTION_DAYS="${RETENTION_DAYS:-31}"
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MIN_KEEP="${MIN_KEEP:-31}"
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CUTOFF=$(date -d "${RETENTION_DAYS} days ago" +%Y-%m-%d)
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# Collect all dated files (basename matches YYYY-MM-DD-*)
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mapfile -t DATED_FILES < <(
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find "$DIR" -maxdepth 1 -type f -name "[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]-*" \
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| sort -r # sort descending by filename (date first)
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)
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total=${#DATED_FILES[@]}
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$DRY_RUN && echo "*** DRY RUN — no files will be deleted ***"
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echo ""
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if [[ $total -eq 0 ]]; then
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echo "No dated files found in '$DIR'."
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exit 0
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fi
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deleted=0
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skipped_retention=0
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for i in "${!DATED_FILES[@]}"; do
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filepath="${DATED_FILES[$i]}"
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filename=$(basename "$filepath")
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file_date="${filename:0:10}" # extract YYYY-MM-DD
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# Always keep the MIN_KEEP most-recent files (indices 0..MIN_KEEP-1)
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if [[ $i -lt $MIN_KEEP ]]; then
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echo "KEEP (newest ${MIN_KEEP}): $filename"
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continue
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fi
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# Delete if the file's date is before the cutoff
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if [[ "$file_date" < "$CUTOFF" ]]; then
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echo "DELETE (expired): $filename"
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$DRY_RUN || rm -- "$filepath"
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deleted="$((deleted + 1))"
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else
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echo "KEEP (within retention): $filename"
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skipped_retention="$((skipped_retention + 1))"
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fi
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done
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echo ""
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echo "Deleted: $deleted files (dry-run=$DRY_RUN). Kept by min-count: $(( total < MIN_KEEP ? total : MIN_KEEP )). Kept by date window: $skipped_retention." |