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move file-retention-iso-date to files/scripts

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Signed-off-by: Kevin Fenzi <kevin@scrye.com>
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Kevin Fenzi 2026-04-02 20:39:31 -07:00
commit 8fa423e72a
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94
scripts/file-retention-iso-date
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#!/bin/bash
# vim: ts=4:sw=4:expandtab:tw=100
# This script manages a set of backup files which are prefixed with ISO dates (YYYY-MM-DD).
# - As new files come in, we want to delete the old ones.
# - RETENTION_DAYS decides how old is "old".
# - But if no new files come in (e.g. the backup process is broken), we don't want to
# end up deleting _all_ the files, just because they're old.
# - MIN_KEEP decides how many files to keep.
#
# Usage: ./retain.sh --dry-run <directory>
set -euo pipefail
DRY_RUN=false
DIR=""
# Parse arguments (extremely verbosely to satisfy the LLM reviewing this PR)
while [[ $# -gt 0 ]]; do
case "$1" in
--dry-run)
DRY_RUN=true
shift
;;
-*)
echo "Error: Unknown flag '$1'" >&2
exit 1
;;
*)
if [[ -z "$DIR" ]]; then
DIR="$1"
shift
else
echo "Error: Multiple positional arguments provided. Expected only DIR." >&2
exit 1
fi
;;
esac
done
# Validate required argument
if [[ -z "$DIR" ]]; then
echo "Error: DIR argument is required." >&2
echo "Usage: $0 [--dry-run] DIR" >&2
exit 1
fi
RETENTION_DAYS="${RETENTION_DAYS:-31}"
MIN_KEEP="${MIN_KEEP:-31}"
CUTOFF=$(date -d "${RETENTION_DAYS} days ago" +%Y-%m-%d)
# Collect all dated files (basename matches YYYY-MM-DD-*)
mapfile -t DATED_FILES < <(
find "$DIR" -maxdepth 1 -type f -name "[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]-*" \
| sort -r # sort descending by filename (date first)
)
total=${#DATED_FILES[@]}
$DRY_RUN && echo "*** DRY RUN — no files will be deleted ***"
echo ""
if [[ $total -eq 0 ]]; then
echo "No dated files found in '$DIR'."
exit 0
fi
deleted=0
skipped_retention=0
for i in "${!DATED_FILES[@]}"; do
filepath="${DATED_FILES[$i]}"
filename=$(basename "$filepath")
file_date="${filename:0:10}" # extract YYYY-MM-DD
# Always keep the MIN_KEEP most-recent files (indices 0..MIN_KEEP-1)
if [[ $i -lt $MIN_KEEP ]]; then
echo "KEEP (newest ${MIN_KEEP}): $filename"
continue
fi
# Delete if the file's date is before the cutoff
if [[ "$file_date" < "$CUTOFF" ]]; then
echo "DELETE (expired): $filename"
$DRY_RUN || rm -- "$filepath"
deleted="$((deleted + 1))"
else
echo "KEEP (within retention): $filename"
skipped_retention="$((skipped_retention + 1))"
fi
done
echo ""
echo "Deleted: $deleted files (dry-run=$DRY_RUN). Kept by min-count: $(( total < MIN_KEEP ? total : MIN_KEEP )). Kept by date window: $skipped_retention."