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#!/usr/bin/env bash
set -euo pipefail
[ -d "$BACKUP_DIR" ] || {
echo "Not a directory: $BACKUP_DIR" >&2
exit 1
}
ts_regex='^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}$'
shopt -s nullglob
candidates=()
for p in "$BACKUP_DIR"/*; do
[[ -d "$p" ]] || continue
name="${p##*/}"
[[ "$name" =~ $ts_regex ]] && candidates+=("$name")
done
shopt -u nullglob
if ((${#candidates[@]} == 0)); then
echo "No matching timestamp directories found in $BACKUP_DIR"
exit 0
fi
mapfile -t sorted < <(printf '%s\n' "${candidates[@]}" | LC_ALL=C sort -r)
newest="${sorted[0]}"
newest_path="${BACKUP_DIR%/}/$newest"
for name in "${sorted[@]:1}"; do
rm -rf -- "${BACKUP_DIR%/}/$name"
done
date_part="${newest%%T*}"
if date --version >/dev/null 2>&1; then
weekname="$(date -d "$date_part" +%G-W%V)"
else
weekname="$(date -jf "%Y-%m-%d" "$date_part" +%G-W%V)"
fi
target="${BACKUP_DIR%/}/${weekname}"
if [[ "$newest_path" == "$target" ]]; then
echo "Newest directory already named '$target'. Done."
exit 0
fi
if [[ -e "$target" && "$target" != "$newest_path" ]]; then
echo "Target '$target' already exists. Refusing to overwrite." >&2
exit 1
fi
mv -- "$newest_path" "$target"
echo "rolled $newest over to $target"
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