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https://github.com/yavook/kiwi-backup.git
synced 2024-11-21 14:33:00 +00:00
simplified build, added guards, prepared encryption
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commit
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2 changed files with 148 additions and 55 deletions
108
Dockerfile
108
Dockerfile
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@ -3,44 +3,6 @@ LABEL maintainer="jmm@yavook.de"
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# Previous work: https://github.com/wernight/docker-duplicity
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ENV \
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#################
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# BACKUP POLICY #
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#################
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#
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# when to run backups
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# default: "36 03 * * * " <=> daily at 3:36 am
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SCHEDULE_BACKUP="36 03 * * * " \
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#
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# when to remove failed transactions
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# default: "36 04 * * * " <=> daily at 04:36 am
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SCHEDULE_CLEANUP="36 04 * * * " \
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#
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# how often to opt for a full backup
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# default: 4M <=> every 4 months
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FULL_BACKUP_FREQUENCY=4M \
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#
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# how long to keep backups at all
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# default: 9M <=> 9 months
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BACKUP_RETENTION_TIME=9M \
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#
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# how many full backup chains with incrementals to keep
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# default: 1
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KEEP_NUM_FULL_CHAINS=1 \
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\
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##################
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# CRON SCHEDULES #
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##################
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#
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# when to remove old full backup chains
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# default: "36 05 * * SAT" <=> every saturday at 05:36 am
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SCHEDULE_RMFULL="36 05 * * SAT" \
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#
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# when to remove old incremental backups
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# default: "36 05 * * SUN" <=> every sunday at 05:36 am
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SCHEDULE_RMINCR="36 05 * * SUN"
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RUN set -ex; \
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\
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apk add --no-cache \
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@ -112,8 +74,74 @@ RUN set -ex; \
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pip3 uninstall -y wheel; \
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apk del --purge .build-deps
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VOLUME ["/backup/source", "/root/.cache/duplicity"]
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ENV \
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#################
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# BACKUP POLICY #
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#################
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#
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# when to run backups
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# default: "36 03 * * *" <=> daily at 3:36 am
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SCHEDULE_BACKUP="36 03 * * *" \
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#
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# when to remove failed transactions
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# default: "36 04 * * *" <=> daily at 04:36 am
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SCHEDULE_CLEANUP="36 04 * * *" \
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#
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# how often to opt for a full backup
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# default: 4M <=> every 4 months
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FULL_BACKUP_FREQUENCY=4M \
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#
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# how long to keep backups at all
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# default: 9M <=> 9 months
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BACKUP_RETENTION_TIME=9M \
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#
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# how many full backup chains with incrementals to keep
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# default: 1
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KEEP_NUM_FULL_CHAINS=1 \
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#
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# where to put backups
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# default: "file:///backup/target" <=> in a host-mounted volume
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BACKUP_TARGET="file:///backup/target" \
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\
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##############
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# ENCRYPTION #
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##############
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#
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# GnuPG key-id as specified by https://www.gnupg.org/documentation/manpage.html#sec-2-6
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GPG_KEY_ID="" \
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#
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GPG_PASSPHRASE="" \
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\
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######################
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# ADDITIONAL OPTIONS #
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######################
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#
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# when to remove old full backup chains
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# default: "36 05 * * SAT" <=> every saturday at 05:36 am
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SCHEDULE_RMFULL="36 05 * * SAT" \
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#
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# when to remove old incremental backups
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# default: "36 05 * * SUN" <=> every sunday at 05:36 am
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SCHEDULE_RMINCR="36 05 * * SUN" \
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#
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# size of individual duplicity data volumes
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# default: 1024 <=> 1GiB
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BACKUP_VOLSIZE=1024 \
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#
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# Additional options for "duplicity" command
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OPTIONS_BACKUP="" \
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#
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# Additional options for "duplicity cleanup" command
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OPTIONS_CLEANUP="" \
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#
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# Additional options for "duplicity remove-older-than" command
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OPTIONS_RMFULL="" \
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#
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# Additional options for "duplicity remove-all-inc-of-but-n-full" command
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OPTIONS_RMINCR=""
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COPY run.sh /usr/local/bin/do-plicity
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VOLUME ["/backup/source", "/backup/target", "/root/.cache/duplicity", "/root/.gnupg"]
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CMD ["do-plicity"]
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95
run.sh
95
run.sh
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@ -1,47 +1,112 @@
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#!/bin/sh
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get_cron_line() {
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#############
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# CONSTANTS #
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#############
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env_exe="$(command -v env)"
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ionice_exe="$(command -v ionice)"
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duplicity_exe="$(command -v duplicity)"
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if [ -n "${GPG_KEY_ID}" ]; then
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# gpg key given
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env_changes="PASSPHRASE='${GPG_PASSPHRASE}'"
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encrypt_opts="--encrypt-key='${GPG_KEY_ID}'"
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else
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# no key given
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env_changes=""
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encrypt_opts="--no-encryption"
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fi
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#############
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# FUNCTIONS #
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#############
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trim_options() {
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# if args are given, trim whitespace, then add a space in front
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if [ -n "${1}" ]; then
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echo " $( echo "${1}" | xargs )"
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fi
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}
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print_command() {
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task="${1}"
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shift 1
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cmdline='/bin/ionice -c 3 /usr/bin/duplicity --no-encryption'
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if [ -n "${env_changes}" ]; then
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# should change environment
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cmdline="${env_exe} ${env_changes} "
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else
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cmdline=""
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fi
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cmdline="${cmdline}${ionice_exe} -c 3 ${duplicity_exe} ${encrypt_opts}"
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case "${task}" in
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backup)
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cmdline="${cmdline} --allow-source-mismatch --volsize 1024 --full-if-older-than ${FULL_BACKUP_FREQUENCY} /backup/source"
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cmdline="${cmdline} --allow-source-mismatch --volsize '${BACKUP_VOLSIZE}' --full-if-older-than '${FULL_BACKUP_FREQUENCY}'"
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cmdline="${cmdline}$( trim_options "${OPTIONS_BACKUP}" )"
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cmdline="${cmdline} /backup/source"
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;;
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clean)
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cleanup)
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cmdline="${cmdline} cleanup --force"
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cmdline="${cmdline}$( trim_options "${OPTIONS_CLEAN}" )"
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;;
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rmfull)
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cmdline="${cmdline} remove-older-than ${BACKUP_RETENTION_TIME} --force"
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cmdline="${cmdline} remove-older-than '${BACKUP_RETENTION_TIME}' --force"
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cmdline="${cmdline}$( trim_options "${OPTIONS_RMFULL}" )"
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;;
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rmincr)
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cmdline="${cmdline} remove-all-inc-of-but-n-full ${KEEP_NUM_FULL_CHAINS} --force"
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cmdline="${cmdline} remove-all-inc-of-but-n-full '${KEEP_NUM_FULL_CHAINS}' --force"
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cmdline="${cmdline}$( trim_options "${OPTIONS_RMINCR}" )"
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;;
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esac
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cmdline="${cmdline} file:///backup/target"
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cmdline="${cmdline} '${BACKUP_TARGET}'"
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echo "${cmdline}"
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}
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prepare_crontab() {
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echo "${SCHEDULE_BACKUP}" "$(get_cron_line backup)"
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echo "${SCHEDULE_CLEANUP}" "$(get_cron_line clean)"
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echo "${SCHEDULE_RMFULL}" "$(get_cron_line rmfull)"
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echo "${SCHEDULE_RMINCR}" "$(get_cron_line rmincr)"
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print_cron_schedule() {
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min="$( echo "${1}" | cut -d' ' -f1 )"
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hour="$( echo "${1}" | cut -d' ' -f2 )"
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day="$( echo "${1}" | cut -d' ' -f3 )"
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month="$( echo "${1}" | cut -d' ' -f4 )"
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weekday="$( echo "${1}" | cut -d' ' -f5 )"
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command="${2}"
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printf '%-8s%-8s%-8s%-8s%-8s%s' "${min}" "${hour}" "${day}" "${month}" "${weekday}" "${command}"
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}
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get_crontab() {
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print_cron_header() {
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# don't split the '#' from 'min'
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print_cron_schedule '#_min hour day month weekday' 'command' | tr '_' ' '
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}
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print_crontab() {
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echo '# crontab generated for kiwi-backup'
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printf '# generation time: '; date
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echo '#'
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prepare_crontab
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echo "$( print_cron_header )"
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echo "$( print_cron_schedule "${SCHEDULE_BACKUP}" "$( print_command backup )" )"
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echo "$( print_cron_schedule "${SCHEDULE_CLEANUP}" "$( print_command cleanup )" )"
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echo "$( print_cron_schedule "${SCHEDULE_RMFULL}" "$( print_command rmfull )" )"
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echo "$( print_cron_schedule "${SCHEDULE_RMINCR}" "$( print_command rmincr )" )"
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}
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########
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# MAIN #
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########
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if [ "${1}" = '-n' ]; then
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# dry-run
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print_crontab
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exit 0
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fi
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# replace crontab, start crond
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get_crontab | crontab -
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print_crontab | crontab -
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crond -fl 8
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exit 0
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