#!/usr/bin/env bash
set -euo pipefail

# === CONFIG ===
REPO="/backups/borgrepo"
HOSTS_FILE="host_vars/hosts"
ARCHIVE_NAME="backup-$(date +%Y-%m-%d)"

# === BUILD SOURCE LIST ===
SOURCES=()

while read -r host; do
    [[ -z "$host" || "$host" =~ ^# ]] && continue
    SOURCES+=("${host}:/")
done < "$HOSTS_FILE"

echo "Backing up hosts:"
printf ' - %s\n' "${SOURCES[@]}"

# === CREATE BACKUP (ONLY current*) ===
borg create \
    "$REPO::$ARCHIVE_NAME" \
    "${SOURCES[@]}" \
    --patterns-from <(cat <<'EOF'
R sh:**
+ sh:**/current*
- sh:**
EOF
) \
    --stats \
    --compression lz4

# === RETENTION POLICY ===
echo "Applying retention policy..."

borg prune \
    "$REPO" \
    --keep-daily=7 \
    --keep-weekly=8 \
    --prefix "backup-" \
    --stats

echo "Done: $ARCHIVE_NAME"