restic backup script for docker bind mounts

run_backup.sh

#!/bin/bash

# to add this as a cronjob that runs every day at 4:00, run `crontab -e` and add the following line:
# 0 4 * * * /srv/restic/run_backup.sh

RESTIC_PATH="/home/al/.nix-profile/bin/restic"
SCRIPT_DIR="/srv/restic"
LOG_FILE="$SCRIPT_DIR/logs/backup_$(date +%Y%m%d_%H%M%S).log"
ENV_FILE="restic.env"

BACKUP_DIR="/srv"

# these directories are excluded from the toggleContainers function
OLD_PROJECTS_DIR="/srv/_old/*"
RESTIC_DIR="/srv/restic/*"

# Function to load environment variables and return the restic command
load_env() {
    local env_file="$SCRIPT_DIR/$ENV_FILE"
    if [ ! -f "$env_file" ]; then
        echo "Error: .env file not found in $SCRIPT_DIR" >&2
        return 1
    fi

    source "$env_file"

    if [ -z "$RESTIC_REPOSITORY" ] || [ -z "$RESTIC_PASSWORD" ]; then
        echo "Error: RESTIC_REPOSITORY or RESTIC_PASSWORD not set in .env file" >&2
        return 1
    fi

    echo "RESTIC_REPOSITORY='$RESTIC_REPOSITORY' RESTIC_PASSWORD='$RESTIC_PASSWORD' $RESTIC_PATH"
}

# Function to stop or start all containers
toggleContainers() {
    if [ "$1" == "stop" ]; then
        find "$BACKUP_DIR" -mount -type f -name '*compose.y*ml' -not -path "$RESTIC_DIR" -print0 2>/dev/null | 
            xargs -0 -I {} sudo docker compose -f "{}" down
        return 0
    elif [ "$1" == "start" ]; then
        find "$BACKUP_DIR" -mount -type f -name '*compose.y*ml' -not -path "$OLD_PROJECTS_DIR" -not -path "$RESTIC_DIR" -print0 2>/dev/null | 
            xargs -0 -I {} sudo docker compose -f "{}" up -d --remove-orphans
        return 0
    else
        echo "Usage: $0 [start|stop]" >&2
        return 1
    fi
}

# Function to log messages with timestamps
log() {
    echo "$(date +"%Y-%m-%d %H:%M:%S") - $1" | tee -a "$LOG_FILE"
}

# Main execution
main() {
    local RESTIC_CMD
    RESTIC_CMD=$(load_env)
    if [ $? -ne 0 ]; then
        log "Error: Failed to load environment. Exiting."
        exit 1
    fi

    log "Stopping all containers"
    toggleContainers stop >> "$LOG_FILE" 2>&1

    log "Running backup with '--verbose=2 backup \"$BACKUP_DIR\"'"
    eval sudo $RESTIC_CMD --verbose=2 backup "$BACKUP_DIR" >> "$LOG_FILE" 2>&1

    log "Running cleanup with '--verbose=2 forget --prune --keep-daily 7 --keep-weekly 4 --keep-monthly 6 --keep-yearly 1'"
    eval sudo $RESTIC_CMD --verbose=2 forget --prune --keep-daily 7 --keep-weekly 4 --keep-monthly 6 --keep-yearly 1 >> "$LOG_FILE" 2>&1

    log "Showing snapshots with '--verbose=2 snapshots'"
    eval sudo $RESTIC_CMD --verbose=2 snapshots >> "$LOG_FILE" 2>&1

    log "Starting all containers"
    toggleContainers start >> "$LOG_FILE" 2>&1
}

# Run the main function
main