66 lines
1.6 KiB
Bash
66 lines
1.6 KiB
Bash
if [[ "$EUID" -ne 0 ]]; then
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echo "Please run the script as root."
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exit 1
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fi
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usage() {
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echo "Usage: $0 [-m partition] [-b backup_location]"
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exit 1
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}
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cleanup() {
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if [ -d "/persist.bak" ]; then btrfs -q subvolume delete "/persist.bak"; fi
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if [ -n "$backup_location" ]; then rm -f "$backup_location.tmp"; fi
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if [ -n "$mount_location" ]; then
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if mount | grep -q "$mount_location"; then umount "$mount_location"; fi
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if [ -d "$mount_location" ]; then rmdir "$mount_location"; fi
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fi
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}
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partition=""
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backup_location=""
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mount_location=""
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trap cleanup EXIT
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while getopts "m:b:" opt; do
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case "$opt" in
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m) partition="$OPTARG" ;;
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b) backup_location="$OPTARG" ;;
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*) usage ;;
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esac
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done
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if [ -n "$partition" ]; then
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mkdir -p "/mnt"
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mount_location=$(mktemp -d /mnt/backup.XXXXXX)
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echo "Mounting $partition at $mount_location..."
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mount "$partition" "$mount_location"
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fi
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if [ -z "$mount_location" ]; then
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if [[ "$backup_location" != /* ]]; then
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backup_location="$(realpath "$backup_location")"
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fi
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else
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if [[ "$backup_location" = /* ]]; then
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echo "Error: When a partition is mounted, backup_location must be relative."
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exit 1
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fi
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backup_location="$(realpath "$mount_location/$backup_location")"
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fi
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backup_location="$backup_location/$(hostname)-$(date +%Y-%m-%d-%H-%M-%S).btrfs.gz"
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echo "Creating /persist snapshot..."
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btrfs -q subvolume snapshot -r "/persist" "/persist.bak"
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echo "Creating backup at $backup_location..."
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btrfs -q send "/persist.bak" | gzip > "$backup_location.tmp"
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mv "$backup_location.tmp" "$backup_location"
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echo "Backup completed successfully!"
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