mirror of
https://github.com/bookwyrm-social/bookwyrm.git
synced 2024-12-13 11:46:35 +00:00
185 lines
5.7 KiB
Bash
185 lines
5.7 KiB
Bash
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#!/usr/bin/env bash
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# Weed old backups. See HELP for details.
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# Tests for this script can be found in:
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# bookwyrm/postgres-docker/tests/testing-entrypoint.sh
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set -euo pipefail
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DAILY_THRESHOLD=14
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WEEKLY_THRESHOLD=4
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MONTHLY_THRESHOLD=-1
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HELP="\
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NAME
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weed -- remove old backups from the backups directory
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SYNOPSIS
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weed.sh [-d threshold] [-w threshold] [-m threshold] [-l] backup_directory
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DESCRIPTION
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Reduce the number of backups by only keeping a certain number of daily backups before \
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reducing the frequency to weekly, monthly, and then finaly annually.
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For each threshold, setting it to 0 will skip that frequency (e.g., setting weekly to \
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0 will mean backups go directly from daily to monthly), and setting it to -1 will \
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never reduce backups to a lower frequency (e.g., setting weekly to -1 will mean \
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backups never are reduced to monthly backups).
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-d threshold: Store this many daily backups before switching to weekly \
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(default $DAILY_THRESHOLD)
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-w threshold: Store this many weekly backups before switching to monthly \
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(default $WEEKLY_THRESHOLD)
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-m threshold: Store this many monthly backups before switching to annual \
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(default $MONTHLY_THRESHOLD)
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-l: Dry run. List the files that would be deleted.
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"
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# fail <message>
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# Write a message to stderr then exit
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function fail {
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echo -e "weed: $1" >&2
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exit 1
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}
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# parse_threshold <hopefully-a-number>
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# Thresholds should be a non-negative number (or -1 for no threshold)
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function parse_threshold {
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if [[ ! $1 =~ ^-?[0-9]+$ || $1 -lt -1 ]]; then
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fail "Invalid threshold: $1"
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fi
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echo "$1"
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}
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# weed_directory <directory> <daily_threshold> <weekly_threshold> <monthly_threshold>
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# List files to be deleted
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function weed_directory {
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local directory=$1
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local daily_threshold=$2
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local weekly_threshold=$3
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local monthly_threshold=$4
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local count=0
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local thresholds=("$daily_threshold" "$weekly_threshold" "$monthly_threshold" -1)
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local date_formats=("%Y %m %d" "%Y %W" "%Y %m" "%Y")
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local index=0
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local last_date=""
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local last_format=""
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local date=""
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# We would like to loop through all the backup files in the backup directory in
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# reverse-chronological order. Bookwyrm backup files are named such that
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# chronological and lexical order match. So we should be safe to find all backup
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# files and reverse sort them. We should be terrified of deleting a backup an
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# instance maintainer wants to keep, so we will be extra cautious. We're ignoring
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# any subdirectories in case someone moves an important backup into a meaningfully
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# named folder. We are also prepending the date to the path before sorting so that
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# the ordering would be correct even if we were allowed to find backup files in
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# subdirectories where chronological and lexical order don't match.
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for date_file in $(
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find "$directory" \
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-maxdepth 1 \
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-name 'backup__[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\.sql' \
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| sed 's/\(^.*backup__\([0-9-]*\)\.sql$\)/\2\1/' \
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| sort --reverse
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); do
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date="${date_file:0:10}"
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file="${date_file:10}"
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date="${date_file:0:10}"
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file="${date_file:10}"
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# We can't fall off the end because we set annual backups to unlimited. It seems
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# unlikely that instance maintainers would have enough concern about the space
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# one backup/year takes to warrant supporting a cutoff.
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while [[ ${thresholds[index]} -ne -1 && $count -ge ${thresholds[index]} ]]; do
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index=$((index + 1))
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last_format=""
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count=0
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done
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if [[ -z "$last_date" ]]; then
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count=$((count + 1))
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last_date=$date
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last_format=""
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else
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if [[ -z "$last_format" ]]; then
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last_format=$(date --date="$last_date" +"${date_formats[index]}")
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fi
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format=$(date --date="$date" +"${date_formats[index]}")
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if [[ "$format" == "$last_format" ]]; then
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echo "$file"
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else
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count=$((count + 1))
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last_date="$date"
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last_format="$format"
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fi
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fi
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done
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}
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function main(){
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local daily_threshold=$DAILY_THRESHOLD
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local weekly_threshold=$WEEKLY_THRESHOLD
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local monthly_threshold=$MONTHLY_THRESHOLD
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local dry_run=""
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while getopts "hd:w:m:l" OPTION; do
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case "$OPTION" in
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h)
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echo "$HELP";
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exit
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;;
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d)
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daily_threshold=$(parse_threshold "$OPTARG")
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;;
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w)
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weekly_threshold=$(parse_threshold "$OPTARG")
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;;
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m)
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monthly_threshold=$(parse_threshold "$OPTARG")
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;;
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l)
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dry_run="true"
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;;
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:)
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fail "Missing argument for '$OPTARG'. To see help run: weed.sh -h"
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;;
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?)
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fail "Unknown option '$OPTION'. To see help run: weed.sh -h"
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esac
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done
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shift "$((OPTIND - 1))"
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if [[ $# -ne 1 ]]; then
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fail "expected a single argument, directory"
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fi
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local count=0
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for file in $(weed_directory "$1" "$daily_threshold" "$weekly_threshold" "$monthly_threshold"); do
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count=$((count + 1))
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if [[ -n "$dry_run" ]]; then
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echo "$file"
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else
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echo "deleting $file" >&2
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rm "$file"
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fi
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done
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if [[ -n "$dry_run" ]]; then
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optional_words="would be "
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else
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optional_words=""
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fi
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echo -e "$count files ${optional_words}deleted" >&2
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}
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if [ "${BASH_SOURCE[0]}" -ef "$0" ]; then
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main "$@"
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fi
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