#!/usr/bin/env bash

LOGFILE="/var/log/btrfs-snapshot.log"
SNAP_DATE=$(date '+%Y-%m-%d_%H%M%S')

send_matrix_webhook() {
    /usr/local/bin/send-matrix-webhook "btrfs-snapshot failed on $(hostname)"
}

trap send_matrix_webhook SIGINT SIGTERM EXIT

create_snapshot() {
    if ! btrfs subvolume snapshot -r "$1" "${1}/.snapshots/$2-$SNAP_DATE" >/dev/null; then
        echo "[$(date '+%Y-%m-%d %H:%M:%S')] Error creating snapshot of $1" | tee -a "$LOGFILE"
        notify-send -i computer-fail "Error creating snapshot of $1"
        exit 1
    else
        echo "[$(date '+%Y-%m-%d %H:%M:%S')] Create snapshot of $1: OK" | tee -a "$LOGFILE"
    fi
}

create_snapshot "/home" "home"