|
|
@@ -0,0 +1,140 @@
|
|
|
+#!/usr/bin/env bash
|
|
|
+set -e
|
|
|
+
|
|
|
+BACKUP_PATH="/backup"
|
|
|
+
|
|
|
+# Make sure that required directories exist
|
|
|
+mkdir -p "${BACKUP_PATH}"
|
|
|
+mkdir -p "/etc/crontabs"
|
|
|
+chown git:git /backup
|
|
|
+chmod 2770 /backup
|
|
|
+
|
|
|
+# [string] BACKUP_INTERVAL Period expression
|
|
|
+# [string] BACKUP_RETENTION Period expression
|
|
|
+if [ -z "${BACKUP_INTERVAL}" ]; then
|
|
|
+ echo "Backup disabled: BACKUP_INTERVAL has not been found" 1>&2
|
|
|
+ exit 1
|
|
|
+fi
|
|
|
+
|
|
|
+if [ -z "${BACKUP_RETENTION}" ]; then
|
|
|
+ echo "Backup retention period is not defined, default to 7 days" 1>&2
|
|
|
+ BACKUP_RETENTION='7d'
|
|
|
+fi
|
|
|
+
|
|
|
+# Parse BACKUP_INTERVAL environment variable and generate appropriate cron expression. Backup cron task will be run as scheduled.
|
|
|
+# Expected format: nu (n - number, u - unit) (eg. 3d means 3 days)
|
|
|
+# Supported units: h - hours, d - days, M - months
|
|
|
+parse_generate_cron_expression() {
|
|
|
+ CRON_EXPR_MINUTES="*"
|
|
|
+ CRON_EXPR_HOURS="*"
|
|
|
+ CRON_EXPR_DAYS="*"
|
|
|
+ CRON_EXPR_MONTHS="*"
|
|
|
+
|
|
|
+ TIME_INTERVAL=$(echo "${BACKUP_INTERVAL}" | sed -e 's/[hdM]$//')
|
|
|
+ TIME_UNIT=$(echo "${BACKUP_INTERVAL}" | sed -e 's/^[0-9]\+//')
|
|
|
+
|
|
|
+ if [ "${TIME_UNIT}" = "h" ]; then
|
|
|
+ if [ ! "${TIME_INTERVAL}" -le 23 ]; then
|
|
|
+ echo "Parse error: Time unit 'h' (hour) cannot be greater than 23" 1>&2
|
|
|
+ exit 1
|
|
|
+ fi
|
|
|
+
|
|
|
+ CRON_EXPR_MINUTES=0
|
|
|
+ CRON_EXPR_HOURS="*/${TIME_INTERVAL}"
|
|
|
+ elif [ "${TIME_UNIT}" = "d" ]; then
|
|
|
+ if [ ! "${TIME_INTERVAL}" -le 30 ]; then
|
|
|
+ echo "Parse error: Time unit 'd' (day) cannot be greater than 30" 1>&2
|
|
|
+ exit 1
|
|
|
+ fi
|
|
|
+
|
|
|
+ CRON_EXPR_MINUTES=0
|
|
|
+ CRON_EXPR_HOURS=0
|
|
|
+ CRON_EXPR_DAYS="*/${TIME_INTERVAL}"
|
|
|
+ elif [ "${TIME_UNIT}" = "M" ]; then
|
|
|
+ if [ ! "${TIME_INTERVAL}" -le 12 ]; then
|
|
|
+ echo "Parse error: Time unit 'M' (month) cannot be greater than 12" 1>&2
|
|
|
+ exit 1
|
|
|
+ fi
|
|
|
+
|
|
|
+ CRON_EXPR_MINUTES=0
|
|
|
+ CRON_EXPR_HOURS=0
|
|
|
+ CRON_EXPR_DAYS="1"
|
|
|
+ CRON_EXPR_MONTHS="*/${TIME_INTERVAL}"
|
|
|
+ else
|
|
|
+ echo "Parse error: BACKUP_INTERVAL expression is invalid" 1>&2
|
|
|
+ exit 1
|
|
|
+ fi
|
|
|
+
|
|
|
+ echo "${CRON_EXPR_MINUTES} ${CRON_EXPR_HOURS} ${CRON_EXPR_DAYS} ${CRON_EXPR_MONTHS} *"
|
|
|
+}
|
|
|
+
|
|
|
+# Parse BACKUP_RETENTION environment variable and generate appropriate find command expression.
|
|
|
+# Expected format: nu (n - number, u - unit) (eg. 3d means 3 days)
|
|
|
+# Supported units: m - minutes, d - days
|
|
|
+parse_generate_retention_expression() {
|
|
|
+ FIND_TIME_EXPR='mtime'
|
|
|
+
|
|
|
+ TIME_INTERVAL=$(echo "${BACKUP_RETENTION}" | sed -e 's/[mhdM]$//')
|
|
|
+ TIME_UNIT=$(echo "${BACKUP_RETENTION}" | sed -e 's/^[0-9]\+//')
|
|
|
+
|
|
|
+ if [ "${TIME_UNIT}" = "m" ]; then
|
|
|
+ if [ "${TIME_INTERVAL}" -le 59 ]; then
|
|
|
+ echo "Warning: Minimal retention is 60m. Value set to 60m" 1>&2
|
|
|
+ TIME_INTERVAL=60
|
|
|
+ fi
|
|
|
+
|
|
|
+ FIND_TIME_EXPR="mmin"
|
|
|
+ elif [ "${TIME_UNIT}" = "h" ]; then
|
|
|
+ echo "Error: Unsupported expression - Try: eg. 120m for 2 hours." 1>&2
|
|
|
+ exit 1
|
|
|
+ elif [ "${TIME_UNIT}" = "d" ]; then
|
|
|
+ FIND_TIME_EXPR="mtime"
|
|
|
+ elif [ "${TIME_UNIT}" = "M" ]; then
|
|
|
+ echo "Error: Unsupported expression - Try: eg. 60d for 2 months." 1>&2
|
|
|
+ exit 1
|
|
|
+ else
|
|
|
+ echo "Parse error: BACKUP_RETENTION expression is invalid" 1>&2
|
|
|
+ exit 1
|
|
|
+ fi
|
|
|
+
|
|
|
+ echo "${FIND_TIME_EXPR} +${TIME_INTERVAL:-7}"
|
|
|
+}
|
|
|
+
|
|
|
+add_backup_cronjob() {
|
|
|
+ CRONTAB_USER="${1:-git}"
|
|
|
+ CRONTAB_FILE="/etc/crontabs/${CRONTAB_USER}"
|
|
|
+ CRONJOB_EXPRESSION="${2:-}"
|
|
|
+ CRONJOB_EXECUTOR="${3:-}"
|
|
|
+ CRONJOB_EXECUTOR_ARGUMENTS="${4:-}"
|
|
|
+ CRONJOB_TASK="${CRONJOB_EXPRESSION} /bin/sh ${CRONJOB_EXECUTOR} ${CRONJOB_EXECUTOR_ARGUMENTS}"
|
|
|
+
|
|
|
+ if [ -f "${CRONTAB_FILE}" ]; then
|
|
|
+ CRONJOB_EXECUTOR_COUNT=$(grep -c "${CRONJOB_EXECUTOR}" "${CRONTAB_FILE}" || exit 0)
|
|
|
+ if [ "${CRONJOB_EXECUTOR_COUNT}" != "0" ]; then
|
|
|
+ echo "Cron job already exists for ${CRONJOB_EXECUTOR}. Updating existing." 1>&2
|
|
|
+ CRONJOB_TASK=$(echo "{CRONJOB_TASK}" | sed 's/\//\\\//g' )
|
|
|
+ CRONJOB_EXECUTOR=$(echo "{CRONJOB_EXECUTOR}" | sed 's/\//\\\//g' )
|
|
|
+ sed -i "/${CRONJOB_EXECUTOR}/c\\${CRONJOB_TASK}" "${CRONTAB_FILE}"
|
|
|
+ return 0
|
|
|
+ fi
|
|
|
+ fi
|
|
|
+
|
|
|
+ # Finally append new line with cron task expression
|
|
|
+ echo "${CRONJOB_TASK}" >>"${CRONTAB_FILE}"
|
|
|
+}
|
|
|
+
|
|
|
+CRONTAB_USER=$(awk -v val="${PUID}" -F ":" '$3==val{print $1}' /etc/passwd)
|
|
|
+
|
|
|
+# Up to this point, it was desirable that interpreter handles the command errors and halts execution upon any error.
|
|
|
+# From now, we handle the errors our self.
|
|
|
+set +e
|
|
|
+RETENTION_EXPRESSION="$(parse_generate_retention_expression)"
|
|
|
+
|
|
|
+if [ -z "${RETENTION_EXPRESSION}" ]; then
|
|
|
+ echo "Couldn't generate backup retention expression. Aborting backup setup" 1>&2
|
|
|
+ exit 1
|
|
|
+fi
|
|
|
+
|
|
|
+# Backup rotator cron will run every 5 minutes
|
|
|
+add_backup_cronjob "${CRONTAB_USER}" "*/5 * * * *" "/app/gogs/docker/runtime/backup-rotator.sh" "'${BACKUP_PATH}' '${RETENTION_EXPRESSION}'"
|
|
|
+add_backup_cronjob "${CRONTAB_USER}" "$(parse_generate_cron_expression)" "/app/gogs/docker/runtime/backup-job.sh" "'${BACKUP_PATH}'"
|
Aleksandar Puharic