Varaverk/Rsync/rsync.sh

#!/bin/bash
set -e
#-----------------------------------------------------------------------------------------------
#----------------- User Variables, Please adjust in Master.conf as needed ----------------------
#-----------------------------------------------------------------------------------------------
# This is the main Core Rsync script
#
# User variables can be adjusted in Master.conf
# Scripts now just contain runtime logic
#
# This allows for profiles and multiple things to use the core script
# Use arguments in unRAID User Plugin for directory
# Example: /mnt/user/appdata/unraid_scripts/Rsync/rsync.sh /mnt/user/appdata-test/Arrs/
#
# /mnt/user/appdata-test/Arrs/ is the argument
# If the last name /Arrs/ matches a profile in Master.conf, then profile defaults are used
# Otherwise, global configuration in Master.conf is used
#-----------------------------------------------------------------------------------------------
#---------------End Of User Variables ----------------------------------------------------------
#-----------------------------------------------------------------------------------------------

# Detect script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# Load Master.conf
MASTER_CONF="$SCRIPT_DIR/../Master.conf"
if [ -f "$MASTER_CONF" ]; then
    source "$MASTER_CONF"
    echo "Loaded Master.conf from $MASTER_CONF"
else
    echo "Error: Master.conf not found at $MASTER_CONF"
    exit 1
fi

# Input Arguments
DIRECTORY="$1"   # Directory to sync
if [[ -z "$DIRECTORY" ]]; then
    echo "Usage: $0 <directory-to-sync> [--dry-run] [VAR=value ...]"
    exit 1
fi

# Optional dry-run
DRY_RUN=false
shift 1
if [[ "$1" == "--dry-run" ]]; then
    DRY_RUN=true
    shift 1
fi

# Optional variable overrides: VAR=value
for ARG in "$@"; do
    if [[ "$ARG" == *=* ]]; then
        VAR_NAME="${ARG%%=*}"
        VAR_VALUE="${ARG#*=}"
        if declare -p "$VAR_NAME" &>/dev/null; then
            eval "$VAR_NAME=\"$VAR_VALUE\""
            echo "Overriding $VAR_NAME -> $VAR_VALUE"
        else
            echo "Warning: Unknown variable $VAR_NAME, ignoring."
        fi
    fi
done

# Determine profile
PROFILE_NAME=$(basename "$DIRECTORY" | tr '[:upper:]' '[:lower:]')
echo "Detected profile: $PROFILE_NAME"

# Apply profile defaults or fallback to master.conf
MAX_RSYNC_PROCS=${PROFILE_MAX_PROCS[$PROFILE_NAME]:-$MAX_RSYNC_PROCS}
BW_LIMIT=${PROFILE_BW_LIMIT[$PROFILE_NAME]:-$BW_LIMIT}
CRITICAL_CONTAINER_NAMES=(${PROFILE_CRITICAL_CONTAINER_NAMES[$PROFILE_NAME]})
DELAYED_CONTAINERS=(${PROFILE_DELAYED_CONTAINERS[$PROFILE_NAME]})
CONTAINER_DELAY=${PROFILE_CONTAINER_DELAY[$PROFILE_NAME]:-$CONTAINER_DELAY}
RETRY_COUNT=${PROFILE_RETRY_COUNT[$PROFILE_NAME]:-$RETRY_COUNT}
SLEEP=${PROFILE_SLEEP[$PROFILE_NAME]:-$SLEEP}
EXCLUDE_DIRS=(${PROFILE_EXCLUDE_DIRS[$PROFILE_NAME]:-${EXCLUDE_DIRS[@]}})

echo "Settings: MAX_RSYNC_PROCS=$MAX_RSYNC_PROCS, BW_LIMIT=$BW_LIMIT, CONTAINERS=${CRITICAL_CONTAINER_NAMES[*]}, EXCLUDES=${EXCLUDE_DIRS[*]}"

# Dependency check
for cmd in rsync ssh ping timeout docker tailscale; do
    command -v "$cmd" >/dev/null 2>&1 || {
        echo "Error: Required command '$cmd' is not installed."
        exit 1
    }
done

trap 'echo "Script interrupted. Exiting."; exit 130' INT TERM

# Helper functions
wait_for_rsync() {
    for attempt in $(seq 1 "$RETRY_COUNT"); do
        RSYNC_COUNT=$(pgrep -fc "rsync.*root@${REMOTE_SERVER}" || true)
        if [ "$RSYNC_COUNT" -ge "$MAX_RSYNC_PROCS" ]; then
            echo "[$LOCAL_SERVER_NAME] Waiting... ($RSYNC_COUNT active rsync processes)"
            sleep "$SLEEP"
        else
            return 0
        fi
    done
    echo "Too many rsync processes, exiting."
    exit 1
}

check_server_online() {
    timeout 5 ping -c 1 "$REMOTE_SERVER" &>/dev/null
}

declare -a RUNNING_CONTAINERS=()

stop_containers() {
    echo "[$LOCAL_SERVER_NAME] Checking containers on ${REMOTE_SERVER_NAME}..."
    RUNNING_CONTAINERS=()
    for container in "${CRITICAL_CONTAINER_NAMES[@]}"; do
        STATUS=$(ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" \
            "docker inspect -f '{{.State.Running}}' $container 2>/dev/null" || echo "false")
        if [ "$STATUS" == "true" ]; then
            echo "Stopping $container"
            RUNNING_CONTAINERS+=("$container")
            ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker stop $container"
        fi
    done
}

start_containers() {
    echo "[$LOCAL_SERVER_NAME] Restarting containers on ${REMOTE_SERVER_NAME}..."
    for container in "${RUNNING_CONTAINERS[@]}"; do
        if [[ " ${DELAYED_CONTAINERS[*]} " == *" $container "* ]]; then
            echo "Delaying start of $container by ${CONTAINER_DELAY}s..."
            sleep "$CONTAINER_DELAY"
        fi
        ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker start $container"
    done
}

# Main sync logic
main() {
    echo "[$LOCAL_SERVER_NAME] Syncing $DIRECTORY → $REMOTE_SERVER:$DIRECTORY"

    for i in $(seq 1 "$RETRY_COUNT"); do
        if check_server_online; then
            break
        fi
        echo "Remote $REMOTE_SERVER_NAME down, retrying in $SLEEP seconds..."
        sleep "$SLEEP"
    done

    check_server_online || { echo "Remote $REMOTE_SERVER_NAME unreachable. Exiting."; exit 1; }

    wait_for_rsync
    stop_containers

    RSYNC_OPTS=(
        -av
        --info=progress2
        --human-readable
        --bwlimit="$BW_LIMIT"
        --delete
        --inplace
        --no-whole-file
    )

    # Apply profile-specific excludes
    for ex in "${EXCLUDE_DIRS[@]}"; do
        RSYNC_OPTS+=(--exclude="$ex")
    done

    [ "$DRY_RUN" = true ] && RSYNC_OPTS+=("--dry-run")

    for attempt in $(seq 1 "$RETRY_COUNT"); do
        echo "Starting rsync attempt $attempt/$RETRY_COUNT..."
        if rsync "${RSYNC_OPTS[@]}" \
            -e "ssh -i \"$SSH_KEY\" -T -o Compression=no -o IPQoS=throughput" \
            "$DIRECTORY" "root@${REMOTE_SERVER}:$DIRECTORY"; then
            echo "Rsync completed successfully."
            break
        else
            echo "Rsync attempt $attempt failed."
            if [ "$attempt" -lt "$RETRY_COUNT" ]; then
                echo "Retrying in $SLEEP seconds..."
                sleep "$SLEEP"
            else
                echo "All $RETRY_COUNT rsync attempts failed."
                start_containers
                exit 1
            fi
        fi
    done

    start_containers
    echo "[$LOCAL_SERVER_NAME] Sync complete."
}

# Execute
main